chore: v0.2.1

fix(external): fix_timestamp digits counting (#3 )
feat(external): add support for smartrte.github.io
2025-07-01 04:06:27 +00:00 · 2023-11-01 14:09:44 +08:00 · 2023-10-27 00:23:17 +08:00 · 2023-10-21 21:38:47 +08:00 · 2023-10-21 20:58:40 +08:00 · 2023-10-21 19:03:21 +08:00
40 changed files with 2402 additions and 158 deletions
--- a/674
+++ b/674
@ -0,0 +1,674 @@
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+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/README.md
+++ b/README.md
@ -1,22 +1,39 @@
 # Arcaea Offline

-> 接受 <i><b>lr</b><sub>lowiro</sub></i> 的一切
+English | [简体中文](./README.zh_Hans.md)

-![Excel | Eternity](./assets/excel_eternity.png "Excel | Eternity")
+<span>
+  <img src="./assets/banner.png" style="height: 175px; object-fit: contain;">
+</span>
+
+> Accept <i><b>lr</b><sub>lowiro</sub></i>

 ## WIP

-This project is under active development, thus it is unstable and API may change frequently.
+> **Warning**
+> This project is under active development, thus it is unstable and API may change frequently.

-## 这事什么？
+## What is this？

-这是用于计算 [Arcaea](https://arcaea.lowiro.com/) 中，玩家潜力值的 [B30 和 R10](https://wiki.arcaea.cn/潜力值#整体潜力值计算) 部分的程序。
+This is the core library of `Arcaea Offline`, designed to manage player scores, calculate their potential, and provide various useful tools.

-## 这怎么用？
+## How to use this？

-这个存储库是相对基础的，提供操作数据库等“底层”操作的 python 库。要使用该库，请查阅 API 手册（还没写）。
+This repository is a python library.

-如果您正寻找 GUI，请前往 [283375/arcaea-offline-pyside-ui](https://github.com/283375/arcaea-offline-pyside-ui) 了解详情。
+For general users, if you don't know what is a "library", you may be interested about [this GUI](https://github.com/283375/arcaea-offline-pyside-ui).
+
+For developers, the documentation is under construction. Check back later!
+
+## License
+
+This file is part of arcaea-offline.
+
+arcaea-offline is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+arcaea-offline is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with arcaea-offline. If not, see <https://www.gnu.org/licenses/>.

 ## Credits

--- a/README.zh_Hans.md
+++ b/README.zh_Hans.md
@ -0,0 +1,38 @@
+# Arcaea Offline
+
+<span>
+  <img src="./assets/banner.png" style="height: 175px; object-fit: contain;">
+</span>
+
+> 接受 <i><b>lr</b><sub>lowiro</sub></i> 的一切
+
+## WIP
+
+> **Warning**
+> 该项目正处于早期开发阶段，不能保证稳定性，且 API 可能随时变动。
+
+## 这是什么？
+
+这是 `Arcaea Offline` 的核心依赖库，用于维护分数数据库、计算潜力值，并提供一些实用工具。
+
+## 这怎么用？
+
+该仓库是一个 python 库。
+
+对普通用户，如果你不知道“库”是什么，你应该对[这个 GUI](https://github.com/283375/arcaea-offline-pyside-ui) 更感兴趣。
+
+对开发者，文档仍在建设当中，敬请期待。
+
+## 许可声明
+
+本文件是 arcaea-offline 的一部分。
+
+arcaea-offline 是自由软件：你可以再分发之和/或依照由自由软件基金会发布的 GNU 通用公共许可证修改之，无论是版本 3 许可证，还是（按你的决定）任何以后版都可以。
+
+发布 arcaea-offline 是希望它能有用，但是并无保障；甚至连可销售和符合某个特定的目的都不保证。请参看 GNU 通用公共许可证，了解详情。
+
+你应该随程序获得一份 GNU 通用公共许可证的复本。如果没有，请看 <https://www.gnu.org/licenses/>。
+
+## Credits
+
+[Arcaea-Infinity/ArcaeaSongDatabase](https://github.com/Arcaea-Infinity/ArcaeaSongDatabase)
--- a/assets/banner.png
+++ b/assets/banner.png
--- a/assets/excel_eternity.png
+++ b/assets/excel_eternity.png
--- a/assets/logo.svg
+++ b/assets/logo.svg
@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="500"
+   height="500"
+   viewBox="0 0 500 500"
+   version="1.1"
+   id="svg1"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1">
+    <linearGradient
+       id="linearGradient1">
+      <stop
+         style="stop-color:#b9b6d8;stop-opacity:1;"
+         offset="0"
+         id="stop1" />
+      <stop
+         style="stop-color:#b9b6d8;stop-opacity:0;"
+         offset="1"
+         id="stop4" />
+    </linearGradient>
+    <linearGradient
+       id="linearGradient2">
+      <stop
+         style="stop-color:#413d5c;stop-opacity:1;"
+         offset="0.1"
+         id="stop2" />
+      <stop
+         style="stop-color:#34333e;stop-opacity:1;"
+         offset="0.89999998"
+         id="stop3" />
+    </linearGradient>
+    <linearGradient
+       xlink:href="#linearGradient2"
+       id="linearGradient3"
+       x1="87.5"
+       y1="165.07216"
+       x2="418.75003"
+       y2="359.92786"
+       gradientUnits="userSpaceOnUse" />
+    <linearGradient
+       xlink:href="#linearGradient1"
+       id="linearGradient6"
+       x1="250"
+       y1="55.144306"
+       x2="250"
+       y2="446.85571"
+       gradientUnits="userSpaceOnUse" />
+  </defs>
+  <g
+     id="layer1">
+    <path
+       style="display:inline;fill:url(#linearGradient3);fill-opacity:1;stroke:none;stroke-width:4;stroke-dasharray:none;stroke-opacity:1"
+       d="M 25,275 150,55.144305 H 350 L 475,275 362.50004,444.8557 H 137.49996 Z"
+       id="path16" />
+    <path
+       style="display:inline;fill:#626080;fill-opacity:1;stroke:none;stroke-width:4;stroke-dasharray:none;stroke-opacity:1"
+       d="M 150,55.144305 110.28321,125 H 389.71679 L 350,55.144305 Z"
+       id="path7" />
+    <path
+       style="display:inline;fill:none;fill-opacity:1;stroke:url(#linearGradient6);stroke-width:4;stroke-dasharray:none;stroke-opacity:1"
+       d="M 25,275 150,55.144305 H 350 L 475,275 362.50004,444.8557 H 137.49996 Z"
+       id="path9" />
+    <path
+       style="font-size:50px;font-family:GeosansLight;-inkscape-font-specification:GeosansLight;letter-spacing:-1px;fill:#dcdaf2;stroke-width:20"
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+       id="text23"
+       aria-label="POTENTIAL" />
+    <path
+       id="path3"
+       style="display:inline;fill:#c6c3e5;stroke-width:4"
+       d="m 250,170 c -32.54103,0.0757 -61.79382,19.85476 -73.98633,50.02539 -0.3378,-0.0116 -0.67571,-0.02 -1.01367,-0.0254 -30.3756,0 -55,24.6244 -55,55 0,30.3756 24.6244,55 55,55 h 75 39.08594 C 268.71234,317.72216 255,295.37888 255,270 255,235.53617 280.28555,206.6766 313.20703,201.02148 298.19408,181.63471 274.93594,170.00868 250,170 Z m 111.87305,84.33984 -52.53321,52.53321 C 314.13799,308.88757 319.42648,310 325,310 c 22.269,0 40,-17.731 40,-40 0,-5.57352 -1.11243,-10.86201 -3.12695,-15.66016 z"
+       transform="translate(-2.5,20)" />
+    <path
+       id="circle14"
+       style="color:#000000;fill:#dcdaf2;-inkscape-stroke:none"
+       d="M 325 210 C 291.9222 210 265 236.9222 265 270 C 265 303.0778 291.9222 330 325 330 C 358.0778 330 385 303.0778 385 270 C 385 236.9222 358.0778 210 325 210 z M 325 220 C 337.03042 220 348.04772 224.22367 356.66211 231.26758 L 286.26758 301.66211 C 279.22367 293.04772 275 282.03042 275 270 C 275 242.3266 297.3266 220 325 220 z M 363.73242 238.33789 C 370.77633 246.95228 375 257.96958 375 270 C 375 297.6734 352.6734 320 325 320 C 312.96958 320 301.95228 315.77633 293.33789 308.73242 L 363.73242 238.33789 z "
+       transform="translate(-2.5,20)" />
+  </g>
+</svg>
--- a/pyproject.toml
+++ b/pyproject.toml
@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"

 [project]
 name = "arcaea-offline"
-version = "0.1.0"
+version = "0.2.1"
 authors = [{ name = "283375", email = "log_283375@163.com" }]
 description = "Manage your local Arcaea score database."
 readme = "README.md"
@ -13,6 +13,7 @@ dependencies = [
  "beautifulsoup4==4.12.2",
  "SQLAlchemy==2.0.20",
  "SQLAlchemy-Utils==0.41.1",
+  "Whoosh==2.7.4",
 ]
 classifiers = [
  "Development Status :: 3 - Alpha",
--- a/requirements.txt
+++ b/requirements.txt
@ -1,3 +1,4 @@
 beautifulsoup4==4.12.2
 SQLAlchemy==2.0.20
 SQLAlchemy-Utils==0.41.1
+Whoosh==2.7.4
--- a/src/arcaea_offline/calculate.py
+++ b/src/arcaea_offline/calculate.py
@ -1,48 +0,0 @@
-from decimal import Decimal
-from math import floor
-from typing import Dict, List
-
-from .models.scores import Calculated
-
-
-def calculate_score_range(notes: int, pure: int, far: int):
-    single_note_score = 10000000 / Decimal(notes)
-
-    actual_score = floor(
-        single_note_score * pure + single_note_score * Decimal(0.5) * far
-    )
-    return (actual_score, actual_score + pure)
-
-
-def calculate_potential(_constant: float, score: int) -> Decimal:
-    constant = Decimal(_constant)
-    if score >= 10000000:
-        return constant + 2
-    elif score >= 9800000:
-        return constant + 1 + (Decimal(score - 9800000) / 200000)
-    else:
-        return max(Decimal(0), constant + (Decimal(score - 9500000) / 300000))
-
-
-def calculate_shiny_pure(notes: int, score: int, pure: int, far: int) -> int:
-    single_note_score = 10000000 / Decimal(notes)
-    actual_score = single_note_score * pure + single_note_score * Decimal(0.5) * far
-    return score - floor(actual_score)
-
-
-def get_b30_calculated_list(calculated_list: List[Calculated]) -> List[Calculated]:
-    best_scores: Dict[str, Calculated] = {}
-    for calculated in calculated_list:
-        key = f"{calculated.song_id}_{calculated.rating_class}"
-        stored = best_scores.get(key)
-        if stored and stored.score < calculated.score or not stored:
-            best_scores[key] = calculated
-    ret_list = list(best_scores.values())
-    ret_list = sorted(ret_list, key=lambda c: c.potential, reverse=True)[:30]
-    return ret_list
-
-
-def calculate_b30(calculated_list: List[Calculated]) -> Decimal:
-    ptt_list = [Decimal(c.potential) for c in get_b30_calculated_list(calculated_list)]
-    sum_ptt_list = sum(ptt_list)
-    return (sum_ptt_list / len(ptt_list)) if sum_ptt_list else Decimal("0.0")
--- a/src/arcaea_offline/calculate/init.py
+++ b/src/arcaea_offline/calculate/init.py
@ -0,0 +1,8 @@
+from .b30 import calculate_b30, get_b30_calculated_list
+from .score import (
+    calculate_constants_from_play_rating,
+    calculate_play_rating,
+    calculate_score_modifier,
+    calculate_score_range,
+    calculate_shiny_pure,
+)
--- a/src/arcaea_offline/calculate/b30.py
+++ b/src/arcaea_offline/calculate/b30.py
@ -0,0 +1,24 @@
+from decimal import Decimal
+from typing import Dict, List
+
+from ..models.scores import ScoreCalculated
+
+
+def get_b30_calculated_list(
+    calculated_list: List[ScoreCalculated],
+) -> List[ScoreCalculated]:
+    best_scores: Dict[str, ScoreCalculated] = {}
+    for calculated in calculated_list:
+        key = f"{calculated.song_id}_{calculated.rating_class}"
+        stored = best_scores.get(key)
+        if stored and stored.score < calculated.score or not stored:
+            best_scores[key] = calculated
+    ret_list = list(best_scores.values())
+    ret_list = sorted(ret_list, key=lambda c: c.potential, reverse=True)[:30]
+    return ret_list
+
+
+def calculate_b30(calculated_list: List[ScoreCalculated]) -> Decimal:
+    ptt_list = [Decimal(c.potential) for c in get_b30_calculated_list(calculated_list)]
+    sum_ptt_list = sum(ptt_list)
+    return (sum_ptt_list / len(ptt_list)) if sum_ptt_list else Decimal("0.0")
--- a/src/arcaea_offline/calculate/score.py
+++ b/src/arcaea_offline/calculate/score.py
@ -0,0 +1,64 @@
+from dataclasses import dataclass
+from decimal import Decimal
+from math import floor
+from typing import Tuple, Union
+
+
+def calculate_score_range(notes: int, pure: int, far: int):
+    single_note_score = 10000000 / Decimal(notes)
+
+    actual_score = floor(
+        single_note_score * pure + single_note_score * Decimal(0.5) * far
+    )
+    return (actual_score, actual_score + pure)
+
+
+def calculate_score_modifier(score: int) -> Decimal:
+    if score >= 10000000:
+        return Decimal(2)
+    elif score >= 9800000:
+        return Decimal(1) + (Decimal(score - 9800000) / 200000)
+    else:
+        return Decimal(score - 9500000) / 300000
+
+
+def calculate_play_rating(constant: int, score: int) -> Decimal:
+    score_modifier = calculate_score_modifier(score)
+    return max(Decimal(0), Decimal(constant) / 10 + score_modifier)
+
+
+def calculate_shiny_pure(notes: int, score: int, pure: int, far: int) -> int:
+    single_note_score = 10000000 / Decimal(notes)
+    actual_score = single_note_score * pure + single_note_score * Decimal(0.5) * far
+    return score - floor(actual_score)
+
+
+@dataclass
+class ConstantsFromPlayRatingResult:
+    EXPlus: Tuple[Decimal, Decimal]
+    EX: Tuple[Decimal, Decimal]
+    AA: Tuple[Decimal, Decimal]
+    A: Tuple[Decimal, Decimal]
+    B: Tuple[Decimal, Decimal]
+    C: Tuple[Decimal, Decimal]
+
+
+def calculate_constants_from_play_rating(play_rating: Union[Decimal, str, float, int]):
+    play_rating = Decimal(play_rating)
+
+    ranges = []
+    for upperScore, lowerScore in [
+        (10000000, 9900000),
+        (9899999, 9800000),
+        (9799999, 9500000),
+        (9499999, 9200000),
+        (9199999, 8900000),
+        (8899999, 8600000),
+    ]:
+        upperScoreModifier = calculate_score_modifier(upperScore)
+        lowerScoreModifier = calculate_score_modifier(lowerScore)
+        ranges.append(
+            (play_rating - upperScoreModifier, play_rating - lowerScoreModifier)
+        )
+
+    return ConstantsFromPlayRatingResult(*ranges)
--- a/src/arcaea_offline/calculate/world_step.py
+++ b/src/arcaea_offline/calculate/world_step.py
@ -0,0 +1,175 @@
+from decimal import Decimal
+from typing import Literal, Optional, Union
+
+
+class PlayResult:
+    def __init__(
+        self,
+        *,
+        play_rating: Union[Decimal, str, float, int],
+        partner_step: Union[Decimal, str, float, int],
+    ):
+        self.__play_rating = play_rating
+        self.__partner_step = partner_step
+
+    @property
+    def play_rating(self):
+        return Decimal(self.__play_rating)
+
+    @property
+    def partner_step(self):
+        return Decimal(self.__partner_step)
+
+
+class PartnerBonus:
+    def __init__(
+        self,
+        *,
+        step_bonus: Union[Decimal, str, float, int] = Decimal("0.0"),
+        final_multiplier: Union[Decimal, str, float, int] = Decimal("1.0"),
+    ):
+        self.__step_bonus = step_bonus
+        self.__final_multiplier = final_multiplier
+
+    @property
+    def step_bonus(self):
+        return Decimal(self.__step_bonus)
+
+    @property
+    def final_multiplier(self):
+        return Decimal(self.__final_multiplier)
+
+
+AwakenedIlithPartnerBonus = PartnerBonus(step_bonus="6.0")
+AwakenedEtoPartnerBonus = PartnerBonus(step_bonus="7.0")
+AwakenedLunaPartnerBonus = PartnerBonus(step_bonus="7.0")
+
+
+class AwakenedAyuPartnerBonus(PartnerBonus):
+    def __init__(self, step_bonus: Union[Decimal, str, float, int]):
+        super().__init__(step_bonus=step_bonus)
+
+
+AmaneBelowExPartnerBonus = PartnerBonus(final_multiplier="0.5")
+
+
+class MithraTerceraPartnerBonus(PartnerBonus):
+    def __init__(self, step_bonus: int):
+        super().__init__(step_bonus=step_bonus)
+
+
+MayaPartnerBonus = PartnerBonus(final_multiplier="2.0")
+
+
+class StepBooster:
+    def final_value(self) -> Decimal:
+        raise NotImplementedError()
+
+
+class LegacyMapStepBooster(StepBooster):
+    def __init__(
+        self,
+        stamina: Literal[2, 4, 6],
+        fragments: Literal[100, 250, 500, None],
+    ):
+        self.stamina = stamina
+        self.fragments = fragments
+
+    @property
+    def stamina(self):
+        return self.__stamina
+
+    @stamina.setter
+    def stamina(self, value: Literal[2, 4, 6]):
+        if value not in [2, 4, 6]:
+            raise ValueError("stamina can only be one of [2, 4, 6]")
+        self.__stamina = value
+
+    @property
+    def fragments(self):
+        return self.__fragments
+
+    @fragments.setter
+    def fragments(self, value: Literal[100, 250, 500, None]):
+        if value not in [100, 250, 500, None]:
+            raise ValueError("fragments can only be one of [100, 250, 500, None]")
+        self.__fragments = value
+
+    def final_value(self) -> Decimal:
+        stamina_multiplier = Decimal(self.stamina)
+        if self.fragments is None:
+            fragments_multiplier = Decimal(1)
+        elif self.fragments == 100:
+            fragments_multiplier = Decimal("1.1")
+        elif self.fragments == 250:
+            fragments_multiplier = Decimal("1.25")
+        elif self.fragments == 500:
+            fragments_multiplier = Decimal("1.5")
+        return stamina_multiplier * fragments_multiplier
+
+
+class MemoriesStepBooster(StepBooster):
+    def final_value(self) -> Decimal:
+        return Decimal("4.0")
+
+
+def calculate_step_original(
+    play_result: PlayResult,
+    *,
+    partner_bonus: Optional[PartnerBonus] = None,
+    step_booster: Optional[StepBooster] = None,
+):
+    ptt = play_result.play_rating
+    step = play_result.partner_step
+    if partner_bonus:
+        partner_bonus_step = partner_bonus.step_bonus
+        partner_bonus_multiplier = partner_bonus.final_multiplier
+    else:
+        partner_bonus_step = Decimal("0")
+        partner_bonus_multiplier = Decimal("1.0")
+
+    play_result = (Decimal("2.45") * ptt.sqrt() + Decimal("2.5")) * (step / 50)
+    play_result += partner_bonus_step
+    play_result *= partner_bonus_multiplier
+    if step_booster:
+        play_result *= step_booster.final_value()
+
+    return play_result
+
+
+def calculate_step(
+    play_result: PlayResult,
+    *,
+    partner_bonus: Optional[PartnerBonus] = None,
+    step_booster: Optional[StepBooster] = None,
+):
+    play_result_original = calculate_step_original(
+        play_result, partner_bonus=partner_bonus, step_booster=step_booster
+    )
+
+    return round(play_result_original, 1)
+
+
+def calculate_play_rating_from_step(
+    step: Union[Decimal, str, int, float],
+    partner_step_value: Union[Decimal, str, int, float],
+    *,
+    partner_bonus: Optional[PartnerBonus] = None,
+    step_booster: Optional[StepBooster] = None,
+):
+    step = Decimal(step)
+    partner_step_value = Decimal(partner_step_value)
+
+    # get original play result
+    if partner_bonus and partner_bonus.final_multiplier:
+        step /= partner_bonus.final_multiplier
+    if step_booster:
+        step /= step_booster.final_value()
+
+    if partner_bonus and partner_bonus.step_bonus:
+        step -= partner_bonus.step_bonus
+
+    play_rating_sqrt = (Decimal(50) * step - Decimal("2.5") * partner_step_value) / (
+        Decimal("2.45") * partner_step_value
+    )
+    return play_rating_sqrt**2 if play_rating_sqrt >= 0 else -(play_rating_sqrt**2)
--- a/src/arcaea_offline/database.py
+++ b/src/arcaea_offline/database.py
@ -1,19 +1,47 @@
-from sqlalchemy import Engine, select
-from sqlalchemy.orm import sessionmaker
+import logging
+import math
+from typing import Iterable, List, Optional, Type, Union

+from sqlalchemy import Engine, func, inspect, select
+from sqlalchemy.orm import DeclarativeBase, InstrumentedAttribute, sessionmaker
+
+from .calculate import calculate_score_modifier
+from .external.arcsong.arcsong_json import ArcSongJsonBuilder
+from .external.exports import ScoreExport, exporters
 from .models.config import *
 from .models.scores import *
 from .models.songs import *
 from .singleton import Singleton

+logger = logging.getLogger(__name__)
+

 class Database(metaclass=Singleton):
-    def __init__(self, engine: Engine):
-        self.engine = engine
+    def __init__(self, engine: Optional[Engine]):
+        try:
+            self.__engine
+        except AttributeError:
+            self.__engine = None
+
+        if engine is None:
+            if isinstance(self.engine, Engine):
+                return
+            raise ValueError("No sqlalchemy.Engine instance specified before.")
+        elif isinstance(engine, Engine):
+            if isinstance(self.engine, Engine):
+                logger.warning(
+                    f"A sqlalchemy.Engine instance {self.engine} has been specified "
+                    f"and will be replaced to {engine}"
+                )
+            self.engine = engine
+        else:
+            raise ValueError(
+                f"A sqlalchemy.Engine instance expected, not {repr(engine)}"
+            )

    @property
-    def engine(self):
-        return self.__engine
+    def engine(self) -> Engine:
+        return self.__engine  # type: ignore

    @engine.setter
    def engine(self, value: Engine):
@ -26,15 +54,19 @@ class Database(metaclass=Singleton):
    def sessionmaker(self):
        return self.__sessionmaker

+    # region init
+
    def init(self, checkfirst: bool = True):
        # create tables & views
        if checkfirst:
            # > https://github.com/kvesteri/sqlalchemy-utils/issues/396
            # > view.create_view() causes DuplicateTableError on Base.metadata.create_all(checkfirst=True)
            # so if `checkfirst` is True, drop these views before creating
+            SongsViewBase.metadata.drop_all(self.engine)
            ScoresViewBase.metadata.drop_all(self.engine)

        SongsBase.metadata.create_all(self.engine, checkfirst=checkfirst)
+        SongsViewBase.metadata.create_all(self.engine)
        ScoresBase.metadata.create_all(self.engine, checkfirst=checkfirst)
        ScoresViewBase.metadata.create_all(self.engine)
        ConfigBase.metadata.create_all(self.engine, checkfirst=checkfirst)
@ -44,5 +76,322 @@ class Database(metaclass=Singleton):
            stmt = select(Property.value).where(Property.key == "version")
            result = session.execute(stmt).fetchone()
            if not checkfirst or not result:
-                session.add(Property(key="version", value="2"))
+                session.add(Property(key="version", value="4"))
                session.commit()
+
+    def check_init(self) -> bool:
+        # check table exists
+        expect_tables = (
+            list(SongsBase.metadata.tables.keys())
+            + list(ScoresBase.metadata.tables.keys())
+            + list(ConfigBase.metadata.tables.keys())
+            + [
+                Chart.__tablename__,
+                ScoreCalculated.__tablename__,
+                ScoreBest.__tablename__,
+                CalculatedPotential.__tablename__,
+            ]
+        )
+        return all(inspect(self.engine).has_table(t) for t in expect_tables)
+
+    # endregion
+
+    def version(self) -> Union[int, None]:
+        stmt = select(Property).where(Property.key == "version")
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return None if result is None else int(result.value)
+
+    # region Pack
+
+    def get_packs(self):
+        stmt = select(Pack)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_pack(self, pack_id: str):
+        stmt = select(Pack).where(Pack.id == pack_id)
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    def get_pack_localized(self, pack_id: str):
+        stmt = select(PackLocalized).where(PackLocalized.id == pack_id)
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    # endregion
+
+    # region Song
+
+    def get_songs(self):
+        stmt = select(Song)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_songs_by_pack_id(self, pack_id: str):
+        stmt = select(Song).where(Song.set == pack_id)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_song(self, song_id: str):
+        stmt = select(Song).where(Song.id == song_id)
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    def get_song_localized(self, song_id: str):
+        stmt = select(SongLocalized).where(SongLocalized.id == song_id)
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    # endregion
+
+    # region Difficulty
+
+    def get_difficulties(self):
+        stmt = select(Difficulty)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_difficulties_by_song_id(self, song_id: str):
+        stmt = select(Difficulty).where(Difficulty.song_id == song_id)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_difficulties_localized_by_song_id(self, song_id: str):
+        stmt = select(DifficultyLocalized).where(DifficultyLocalized.song_id == song_id)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_difficulty(self, song_id: str, rating_class: int):
+        stmt = select(Difficulty).where(
+            (Difficulty.song_id == song_id) & (Difficulty.rating_class == rating_class)
+        )
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    def get_difficulty_localized(self, song_id: str, rating_class: int):
+        stmt = select(DifficultyLocalized).where(
+            (DifficultyLocalized.song_id == song_id)
+            & (DifficultyLocalized.rating_class == rating_class)
+        )
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    # endregion
+
+    # region ChartInfo
+
+    def get_chart_infos(self):
+        stmt = select(ChartInfo)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_chart_infos_by_song_id(self, song_id: str):
+        stmt = select(ChartInfo).where(ChartInfo.song_id == song_id)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_chart_info(self, song_id: str, rating_class: int):
+        stmt = select(ChartInfo).where(
+            (ChartInfo.song_id == song_id) & (ChartInfo.rating_class == rating_class)
+        )
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    # endregion
+
+    # region Chart
+
+    def get_charts_by_pack_id(self, pack_id: str):
+        stmt = select(Chart).where(Chart.set == pack_id)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_charts_by_song_id(self, song_id: str):
+        stmt = select(Chart).where(Chart.song_id == song_id)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_charts_by_constant(self, constant: int):
+        stmt = select(Chart).where(Chart.constant == constant)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_chart(self, song_id: str, rating_class: int):
+        stmt = select(Chart).where(
+            (Chart.song_id == song_id) & (Chart.rating_class == rating_class)
+        )
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    # endregion
+
+    # region Score
+
+    def get_scores(self):
+        stmt = select(Score)
+        with self.sessionmaker() as session:
+            results = list(session.scalars(stmt))
+        return results
+
+    def get_score(self, score_id: int):
+        stmt = select(Score).where(Score.id == score_id)
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    def get_score_best(self, song_id: str, rating_class: int):
+        stmt = select(ScoreBest).where(
+            (ScoreBest.song_id == song_id) & (ScoreBest.rating_class == rating_class)
+        )
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    def insert_score(self, score: Score):
+        with self.sessionmaker() as session:
+            session.add(score)
+            session.commit()
+
+    def insert_scores(self, scores: Iterable[Score]):
+        with self.sessionmaker() as session:
+            session.add_all(scores)
+            session.commit()
+
+    def update_score(self, score: Score):
+        if score.id is None:
+            raise ValueError(
+                "Cannot determine which score to update, please specify `score.id`"
+            )
+        with self.sessionmaker() as session:
+            session.merge(score)
+            session.commit()
+
+    def delete_score(self, score: Score):
+        with self.sessionmaker() as session:
+            session.delete(score)
+            session.commit()
+
+    def recommend_charts(self, play_result: float, bounds: float = 0.1):
+        base_constant = math.ceil(play_result * 10)
+
+        results = []
+        results_id = []
+        with self.sessionmaker() as session:
+            for constant in range(base_constant - 20, base_constant + 1):
+                # from Pure Memory(EX+) to AA
+                score_modifier = (play_result * 10 - constant) / 10
+                if score_modifier >= 2.0:
+                    min_score = 10000000
+                elif score_modifier >= 1.0:
+                    min_score = 200000 * (score_modifier - 1) + 9800000
+                else:
+                    min_score = 300000 * score_modifier + 9500000
+                min_score = int(min_score)
+
+                charts = self.get_charts_by_constant(constant)
+                for chart in charts:
+                    score_best_stmt = select(ScoreBest).where(
+                        (ScoreBest.song_id == chart.song_id)
+                        & (ScoreBest.rating_class == chart.rating_class)
+                        & (ScoreBest.score >= min_score)
+                        & (play_result - bounds < ScoreBest.potential)
+                        & (ScoreBest.potential < play_result + bounds)
+                    )
+                    if session.scalar(score_best_stmt):
+                        chart_id = f"{chart.song_id},{chart.rating_class}"
+                        if chart_id not in results_id:
+                            results.append(chart)
+                            results_id.append(chart_id)
+
+        return results
+
+    # endregion
+
+    def get_b30(self):
+        stmt = select(CalculatedPotential.b30).select_from(CalculatedPotential)
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result
+
+    # region COUNT
+
+    def __count_table(self, base: Type[DeclarativeBase]):
+        stmt = select(func.count()).select_from(base)
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result or 0
+
+    def __count_column(self, column: InstrumentedAttribute):
+        stmt = select(func.count(column))
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result or 0
+
+    def count_packs(self):
+        return self.__count_column(Pack.id)
+
+    def count_songs(self):
+        return self.__count_column(Song.id)
+
+    def count_difficulties(self):
+        return self.__count_table(Difficulty)
+
+    def count_chart_infos(self):
+        return self.__count_table(ChartInfo)
+
+    def count_complete_chart_infos(self):
+        stmt = (
+            select(func.count())
+            .select_from(ChartInfo)
+            .where((ChartInfo.constant != None) & (ChartInfo.notes != None))
+        )
+        with self.sessionmaker() as session:
+            result = session.scalar(stmt)
+        return result or 0
+
+    def count_charts(self):
+        return self.__count_table(Chart)
+
+    def count_scores(self):
+        return self.__count_column(Score.id)
+
+    def count_scores_calculated(self):
+        return self.__count_table(ScoreCalculated)
+
+    def count_scores_best(self):
+        return self.__count_table(ScoreBest)
+
+    # endregion
+
+    # region export
+
+    def export_scores(self) -> List[ScoreExport]:
+        scores = self.get_scores()
+        return [exporters.score(score) for score in scores]
+
+    def generate_arcsong(self):
+        with self.sessionmaker() as session:
+            arcsong = ArcSongJsonBuilder(session).generate_arcsong_json()
+        return arcsong
+
+    # endregion
--- a/src/arcaea_offline/external/andreal/init.py
+++ b/src/arcaea_offline/external/andreal/init.py
@ -0,0 +1 @@
+from .api_data import AndrealImageGeneratorApiDataConverter
--- a/src/arcaea_offline/external/andreal/account.py
+++ b/src/arcaea_offline/external/andreal/account.py
@ -0,0 +1,14 @@
+class AndrealImageGeneratorAccount:
+    def __init__(
+        self,
+        name: str = "Player",
+        code: int = 123456789,
+        rating: int = -1,
+        character: int = 5,
+        character_uncapped: bool = False,
+    ):
+        self.name = name
+        self.code = code
+        self.rating = rating
+        self.character = character
+        self.character_uncapped = character_uncapped
--- a/src/arcaea_offline/external/andreal/api_data.py
+++ b/src/arcaea_offline/external/andreal/api_data.py
@ -0,0 +1,98 @@
+from typing import Optional, Union
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from ...models import CalculatedPotential, ScoreBest, ScoreCalculated
+from .account import AndrealImageGeneratorAccount
+
+
+class AndrealImageGeneratorApiDataConverter:
+    def __init__(
+        self,
+        session: Session,
+        account: AndrealImageGeneratorAccount = AndrealImageGeneratorAccount(),
+    ):
+        self.session = session
+        self.account = account
+
+    def account_info(self):
+        return {
+            "code": self.account.code,
+            "name": self.account.name,
+            "is_char_uncapped": self.account.character_uncapped,
+            "rating": self.account.rating,
+            "character": self.account.character,
+        }
+
+    def score(self, score: Union[ScoreCalculated, ScoreBest]):
+        return {
+            "score": score.score,
+            "health": 75,
+            "rating": score.potential,
+            "song_id": score.song_id,
+            "modifier": score.modifier or 0,
+            "difficulty": score.rating_class,
+            "clear_type": score.clear_type or 1,
+            "best_clear_type": score.clear_type or 1,
+            "time_played": score.date * 1000 if score.date else 0,
+            "near_count": score.far,
+            "miss_count": score.lost,
+            "perfect_count": score.pure,
+            "shiny_perfect_count": score.shiny_pure,
+        }
+
+    def user_info(self, score: Optional[ScoreCalculated] = None):
+        if not score:
+            score = self.session.scalar(
+                select(ScoreCalculated).order_by(ScoreCalculated.date.desc()).limit(1)
+            )
+        if not score:
+            raise ValueError("No score available.")
+
+        return {
+            "content": {
+                "account_info": self.account_info(),
+                "recent_score": [self.score(score)],
+            }
+        }
+
+    def user_best(self, song_id: str, rating_class: int):
+        score = self.session.scalar(
+            select(ScoreBest).where(
+                (ScoreBest.song_id == song_id)
+                & (ScoreBest.rating_class == rating_class)
+            )
+        )
+        if not score:
+            raise ValueError("No score available.")
+
+        return {
+            "content": {
+                "account_info": self.account_info(),
+                "record": self.score(score),
+            }
+        }
+
+    def user_best30(self):
+        scores = list(
+            self.session.scalars(
+                select(ScoreBest).order_by(ScoreBest.potential.desc()).limit(40)
+            )
+        )
+        if not scores:
+            raise ValueError("No score available.")
+        best30_avg = self.session.scalar(select(CalculatedPotential.b30))
+
+        best30_overflow = (
+            [self.score(score) for score in scores[30:40]] if len(scores) > 30 else []
+        )
+
+        return {
+            "content": {
+                "account_info": self.account_info(),
+                "best30_avg": best30_avg,
+                "best30_list": [self.score(score) for score in scores[:30]],
+                "best30_overflow": best30_overflow,
+            }
+        }
--- a/src/arcaea_offline/external/arcaea/init.py
+++ b/src/arcaea_offline/external/arcaea/init.py
@ -1,3 +1,4 @@
+from .online import ArcaeaOnlineParser
 from .packlist import PacklistParser
 from .songlist import SonglistDifficultiesParser, SonglistParser
 from .st3 import St3ScoreParser
--- a/src/arcaea_offline/external/arcaea/common.py
+++ b/src/arcaea_offline/external/arcaea/common.py
@ -1,10 +1,41 @@
+import contextlib
 import json
+import math
+import time
 from os import PathLike
 from typing import Any, List, Optional, Union

 from sqlalchemy.orm import DeclarativeBase, Session


+def fix_timestamp(timestamp: int) -> Union[int, None]:
+    """
+    Some of the `date` column in st3 are strangely truncated. For example,
+    a `1670283375` may be truncated to `167028`, even `1`. Yes, a single `1`.
+
+    To properly handle this situation, we check the timestamp's digits.
+    If `digits < 5`, we treat this timestamp as a `None`. Otherwise, we try to
+    fix the timestamp.
+
+    :param timestamp: a POSIX timestamp
+    :return: `None` if the timestamp's digits < 5, otherwise a fixed POSIX timestamp
+    """
+    # find digit length from https://stackoverflow.com/a/2189827/16484891
+    # CC BY-SA 2.5
+    # this might give incorrect result when timestamp > 999999999999997,
+    # see https://stackoverflow.com/a/28883802/16484891 (CC BY-SA 4.0).
+    # but that's way too later than 9999-12-31 23:59:59, 253402271999,
+    # I don't think Arcaea would still be an active updated game by then.
+    # so don't mind those small issues, just use this.
+    digits = int(math.log10(abs(timestamp))) + 1 if timestamp != 0 else 1
+    if digits < 5:
+        return None
+    timestamp_str = str(timestamp)
+    current_timestamp_digits = int(math.log10(int(time.time()))) + 1
+    timestamp_str = timestamp_str.ljust(current_timestamp_digits, "0")
+    return int(timestamp_str, 10)
+
+
 def to_db_value(val: Any) -> Any:
    if not val:
        return None
@ -43,6 +74,25 @@ class ArcaeaParser:
    def __init__(self, filepath: Union[str, bytes, PathLike]):
        self.filepath = filepath

+    def read_file_text(self):
+        file_handle = None
+
+        with contextlib.suppress(TypeError):
+            # original open
+            file_handle = open(self.filepath, "r", encoding="utf-8")
+
+        if file_handle is None:
+            try:
+                # or maybe a `pathlib.Path` subset
+                # or an `importlib.resources.abc.Traversable` like object
+                # e.g. `zipfile.Path`
+                file_handle = self.filepath.open(mode="r", encoding="utf-8")
+            except Exception as e:
+                raise ValueError("Invalid `filepath`.") from e
+
+        with file_handle:
+            return file_handle.read()
+
    def parse(self) -> List[DeclarativeBase]:
        ...

--- a/src/arcaea_offline/external/arcaea/online.py
+++ b/src/arcaea_offline/external/arcaea/online.py
@ -0,0 +1,75 @@
+import json
+import logging
+from datetime import datetime
+from typing import Dict, List, Literal, Optional, TypedDict
+
+from ...models import Score
+from .common import ArcaeaParser, fix_timestamp
+
+logger = logging.getLogger(__name__)
+
+
+class TWebApiRatingMeScoreItem(TypedDict):
+    song_id: str
+    difficulty: int
+    modifier: int
+    rating: float
+    score: int
+    perfect_count: int
+    near_count: int
+    miss_count: int
+    clear_type: int
+    title: Dict[Literal["ja", "en"], str]
+    artist: str
+    time_played: int
+    bg: str
+
+
+class TWebApiRatingMeValue(TypedDict):
+    best_rated_scores: List[TWebApiRatingMeScoreItem]
+    recent_rated_scores: List[TWebApiRatingMeScoreItem]
+
+
+class TWebApiRatingMeResult(TypedDict):
+    success: bool
+    error_code: Optional[int]
+    value: Optional[TWebApiRatingMeValue]
+
+
+class ArcaeaOnlineParser(ArcaeaParser):
+    def __init__(self, filepath):
+        super().__init__(filepath)
+
+    def parse(self) -> List[Score]:
+        api_result_root: TWebApiRatingMeResult = json.loads(self.read_file_text())
+
+        api_result_value = api_result_root.get("value")
+        if not api_result_value:
+            error_code = api_result_root.get("error_code")
+            raise ValueError(f"Cannot parse API result, error code {error_code}")
+
+        best30_score_items = api_result_value.get("best_rated_scores", [])
+        recent_score_items = api_result_value.get("recent_rated_scores", [])
+        score_items = best30_score_items + recent_score_items
+
+        date_text = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+
+        results: List[Score] = []
+        for score_item in score_items:
+            score = Score()
+            score.song_id = score_item["song_id"]
+            score.rating_class = score_item["difficulty"]
+            score.score = score_item["score"]
+            score.pure = score_item["perfect_count"]
+            score.far = score_item["near_count"]
+            score.lost = score_item["miss_count"]
+            score.date = fix_timestamp(int(score_item["time_played"] / 1000))
+            score.modifier = score_item["modifier"]
+            score.clear_type = score_item["clear_type"]
+
+            if score.lost == 0:
+                score.max_recall = score.pure + score.far
+
+            score.comment = f"Parsed from web API at {date_text}"
+            results.append(score)
+        return results
--- a/src/arcaea_offline/external/arcaea/packlist.py
+++ b/src/arcaea_offline/external/arcaea/packlist.py
@ -10,11 +10,12 @@ class PacklistParser(ArcaeaParser):
        super().__init__(filepath)

    def parse(self) -> List[Union[Pack, PackLocalized]]:
-        with open(self.filepath, "r", encoding="utf-8") as pl_f:
-            packlist_json_root = json.loads(pl_f.read())
+        packlist_json_root = json.loads(self.read_file_text())

        packlist_json = packlist_json_root["packs"]
-        results = []
+        results: List[Union[Pack, PackLocalized]] = [
+            Pack(id="single", name="Memory Archive")
+        ]
        for item in packlist_json:
            pack = Pack()
            pack.id = item["id"]
--- a/src/arcaea_offline/external/arcaea/songlist.py
+++ b/src/arcaea_offline/external/arcaea/songlist.py
@ -1,7 +1,7 @@
 import json
 from typing import List, Union

-from ...models.songs import Chart, ChartLocalized, Song, SongLocalized
+from ...models.songs import Difficulty, DifficultyLocalized, Song, SongLocalized
 from .common import ArcaeaParser, is_localized, set_model_localized_attrs, to_db_value


@ -9,9 +9,10 @@ class SonglistParser(ArcaeaParser):
    def __init__(self, filepath):
        super().__init__(filepath)

-    def parse(self) -> List[Union[Song, SongLocalized, Chart, ChartLocalized]]:
-        with open(self.filepath, "r", encoding="utf-8") as sl_f:
-            songlist_json_root = json.loads(sl_f.read())
+    def parse(
+        self,
+    ) -> List[Union[Song, SongLocalized, Difficulty, DifficultyLocalized]]:
+        songlist_json_root = json.loads(self.read_file_text())

        songlist_json = songlist_json_root["songs"]
        results = []
@ -63,9 +64,8 @@ class SonglistDifficultiesParser(ArcaeaParser):
    def __init__(self, filepath):
        self.filepath = filepath

-    def parse(self) -> List[Union[Chart, ChartLocalized]]:
-        with open(self.filepath, "r", encoding="utf-8") as sl_f:
-            songlist_json_root = json.loads(sl_f.read())
+    def parse(self) -> List[Union[Difficulty, DifficultyLocalized]]:
+        songlist_json_root = json.loads(self.read_file_text())

        songlist_json = songlist_json_root["songs"]
        results = []
@ -74,7 +74,10 @@ class SonglistDifficultiesParser(ArcaeaParser):
                continue

            for item in song_item["difficulties"]:
-                chart = Chart(song_id=song_item["id"])
+                if item["rating"] == 0:
+                    continue
+
+                chart = Difficulty(song_id=song_item["id"])
                chart.rating_class = item["ratingClass"]
                chart.rating = item["rating"]
                chart.rating_plus = item.get("ratingPlus") or False
@ -94,7 +97,7 @@ class SonglistDifficultiesParser(ArcaeaParser):
                results.append(chart)

                if is_localized(item, "title") or is_localized(item, "artist"):
-                    chart_localized = ChartLocalized(
+                    chart_localized = DifficultyLocalized(
                        song_id=chart.song_id, rating_class=chart.rating_class
                    )
                    set_model_localized_attrs(chart_localized, item, "title")
--- a/src/arcaea_offline/external/arcaea/st3.py
+++ b/src/arcaea_offline/external/arcaea/st3.py
@ -6,14 +6,12 @@ from sqlalchemy import select
 from sqlalchemy.orm import Session

 from ...models.scores import Score
-from .common import ArcaeaParser
+from .common import ArcaeaParser, fix_timestamp

 logger = logging.getLogger(__name__)


 class St3ScoreParser(ArcaeaParser):
-    CLEAR_TYPES_MAP = {0: -1, 1: 1, 2: 1, 3: 1, 4: 1, 5: 1}
-
    def __init__(self, filepath):
        super().__init__(filepath)

@ -22,17 +20,22 @@ class St3ScoreParser(ArcaeaParser):
        with sqlite3.connect(self.filepath) as st3_conn:
            cursor = st3_conn.cursor()
            db_scores = cursor.execute(
-                "SELECT songId, songDifficulty, score, perfectCount, nearCount, missCount, date FROM scores"
+                "SELECT songId, songDifficulty, score, perfectCount, nearCount, missCount, date, modifier FROM scores"
            ).fetchall()
-            for song_id, rating_class, score, pure, far, lost, date in db_scores:
-                db_clear_type = cursor.execute(
+            for (
+                song_id,
+                rating_class,
+                score,
+                pure,
+                far,
+                lost,
+                date,
+                modifier,
+            ) in db_scores:
+                clear_type = cursor.execute(
                    "SELECT clearType FROM cleartypes WHERE songId = ? AND songDifficulty = ?",
                    (song_id, rating_class),
                ).fetchone()[0]
-                r10_clear_type = self.CLEAR_TYPES_MAP[db_clear_type]
-
-                date_str = str(date)
-                date = None if len(date_str) < 7 else int(date_str.ljust(10, "0"))

                items.append(
                    Score(
@ -42,8 +45,10 @@ class St3ScoreParser(ArcaeaParser):
                        pure=pure,
                        far=far,
                        lost=lost,
-                        date=date,
-                        r10_clear_type=r10_clear_type,
+                        date=fix_timestamp(date),
+                        modifier=modifier,
+                        clear_type=clear_type,
+                        comment=f"Parsed from st3",
                    )
                )

--- a/src/arcaea_offline/external/arcsong/arcsong_db.py
+++ b/src/arcaea_offline/external/arcsong/arcsong_db.py
@ -22,7 +22,7 @@ class ArcsongDbParser:
                    song_id=result[0],
                    rating_class=result[1],
                    constant=result[2],
-                    note=result[3] or None,
+                    notes=result[3] or None,
                )
                results.append(chart)

--- a/src/arcaea_offline/external/arcsong/arcsong_json.py
+++ b/src/arcaea_offline/external/arcsong/arcsong_json.py
@ -0,0 +1,155 @@
+import logging
+import re
+from typing import List, Optional, TypedDict
+
+from sqlalchemy import func, select
+from sqlalchemy.orm import Session
+
+from ...models import (
+    ChartInfo,
+    Difficulty,
+    DifficultyLocalized,
+    Pack,
+    Song,
+    SongLocalized,
+)
+
+logger = logging.getLogger(__name__)
+
+
+class TArcSongJsonDifficultyItem(TypedDict):
+    name_en: str
+    name_jp: str
+    artist: str
+    bpm: str
+    bpm_base: float
+    set: str
+    set_friendly: str
+    time: int
+    side: int
+    world_unlock: bool
+    remote_download: bool
+    bg: str
+    date: int
+    version: str
+    difficulty: int
+    rating: int
+    note: int
+    chart_designer: str
+    jacket_designer: str
+    jacket_override: bool
+    audio_override: bool
+
+
+class TArcSongJsonSongItem(TypedDict):
+    song_id: str
+    difficulties: List[TArcSongJsonDifficultyItem]
+    alias: List[str]
+
+
+class TArcSongJson(TypedDict):
+    songs: List[TArcSongJsonSongItem]
+
+
+class ArcSongJsonBuilder:
+    def __init__(self, session: Session):
+        self.session = session
+
+    def get_difficulty_item(
+        self,
+        difficulty: Difficulty,
+        song: Song,
+        pack: Pack,
+        song_localized: Optional[SongLocalized],
+    ) -> TArcSongJsonDifficultyItem:
+        if "_append_" in pack.id:
+            base_pack = self.session.scalar(
+                select(Pack).where(Pack.id == re.sub(r"_append_.*$", "", pack.id))
+            )
+        else:
+            base_pack = None
+
+        difficulty_localized = self.session.scalar(
+            select(DifficultyLocalized).where(
+                (DifficultyLocalized.song_id == difficulty.song_id)
+                & (DifficultyLocalized.rating_class == difficulty.rating_class)
+            )
+        )
+        chart_info = self.session.scalar(
+            select(ChartInfo).where(
+                (ChartInfo.song_id == difficulty.song_id)
+                & (ChartInfo.rating_class == difficulty.rating_class)
+            )
+        )
+
+        if difficulty_localized:
+            name_jp = difficulty_localized.title_ja or ""
+        elif song_localized:
+            name_jp = song_localized.title_ja or ""
+        else:
+            name_jp = ""
+
+        return {
+            "name_en": difficulty.title or song.title,
+            "name_jp": name_jp,
+            "artist": difficulty.artist or song.artist,
+            "bpm": difficulty.bpm or song.bpm or "",
+            "bpm_base": difficulty.bpm_base or song.bpm_base or 0.0,
+            "set": song.set,
+            "set_friendly": f"{base_pack.name} - {pack.name}"
+            if base_pack
+            else pack.name,
+            "time": 0,
+            "side": song.side or 0,
+            "world_unlock": False,
+            "remote_download": False,
+            "bg": difficulty.bg or song.bg or "",
+            "date": difficulty.date or song.date or 0,
+            "version": difficulty.version or song.version or "",
+            "difficulty": difficulty.rating * 2 + int(difficulty.rating_plus),
+            "rating": chart_info.constant or 0 if chart_info else 0,
+            "note": chart_info.notes or 0 if chart_info else 0,
+            "chart_designer": difficulty.chart_designer or "",
+            "jacket_designer": difficulty.jacket_desginer or "",
+            "jacket_override": difficulty.jacket_override,
+            "audio_override": difficulty.audio_override,
+        }
+
+    def get_song_item(self, song: Song) -> TArcSongJsonSongItem:
+        difficulties = self.session.scalars(
+            select(Difficulty).where(Difficulty.song_id == song.id)
+        )
+
+        pack = self.session.scalar(select(Pack).where(Pack.id == song.set))
+        if not pack:
+            logger.warning(f'Cannot find pack "{song.set}", using placeholder instead.')
+            pack = Pack(id="unknown", name="Unknown", description="__PLACEHOLDER__")
+        song_localized = self.session.scalar(
+            select(SongLocalized).where(SongLocalized.id == song.id)
+        )
+
+        return {
+            "song_id": song.id,
+            "difficulties": [
+                self.get_difficulty_item(difficulty, song, pack, song_localized)
+                for difficulty in difficulties
+            ],
+            "alias": [],
+        }
+
+    def generate_arcsong_json(self) -> TArcSongJson:
+        songs = self.session.scalars(select(Song))
+        arcsong_songs = []
+        for song in songs:
+            proceed = self.session.scalar(
+                select(func.count(Difficulty.rating_class)).where(
+                    Difficulty.song_id == song.id
+                )
+            )
+
+            if not proceed:
+                continue
+
+            arcsong_songs.append(self.get_song_item(song))
+
+        return {"songs": arcsong_songs}
--- a/src/arcaea_offline/external/exports/init.py
+++ b/src/arcaea_offline/external/exports/init.py
@ -0,0 +1,2 @@
+from . import exporters
+from .types import ScoreExport
--- a/src/arcaea_offline/external/exports/exporters.py
+++ b/src/arcaea_offline/external/exports/exporters.py
@ -0,0 +1,19 @@
+from ...models import Score
+from .types import ScoreExport
+
+
+def score(score: Score) -> ScoreExport:
+    return {
+        "id": score.id,
+        "song_id": score.song_id,
+        "rating_class": score.rating_class,
+        "score": score.score,
+        "pure": score.pure,
+        "far": score.far,
+        "lost": score.lost,
+        "date": score.date,
+        "max_recall": score.max_recall,
+        "modifier": score.modifier,
+        "clear_type": score.clear_type,
+        "comment": score.comment,
+    }
--- a/src/arcaea_offline/external/exports/types.py
+++ b/src/arcaea_offline/external/exports/types.py
@ -0,0 +1,16 @@
+from typing import Optional, TypedDict
+
+
+class ScoreExport(TypedDict):
+    id: int
+    song_id: str
+    rating_class: int
+    score: int
+    pure: Optional[int]
+    far: Optional[int]
+    lost: Optional[int]
+    date: Optional[int]
+    max_recall: Optional[int]
+    modifier: Optional[int]
+    clear_type: Optional[int]
+    comment: Optional[str]
--- a/src/arcaea_offline/external/smartrte/init.py
+++ b/src/arcaea_offline/external/smartrte/init.py
@ -0,0 +1 @@
+from .b30_csv import SmartRteB30CsvConverter
--- a/src/arcaea_offline/external/smartrte/b30_csv.py
+++ b/src/arcaea_offline/external/smartrte/b30_csv.py
@ -0,0 +1,64 @@
+from sqlalchemy.orm import Session
+
+from ...models import Chart, ScoreBest
+from ...utils.rating import rating_class_to_text
+
+
+class SmartRteB30CsvConverter:
+    CSV_ROWS = [
+        "songname",
+        "songId",
+        "Difficulty",
+        "score",
+        "Perfect",
+        "criticalPerfect",
+        "Far",
+        "Lost",
+        "Constant",
+        "singlePTT",
+    ]
+
+    def __init__(
+        self,
+        session: Session,
+    ):
+        self.session = session
+
+    def rows(self) -> list:
+        csv_rows = [self.CSV_ROWS.copy()]
+
+        with self.session as session:
+            results = (
+                session.query(
+                    Chart.title,
+                    ScoreBest.song_id,
+                    ScoreBest.rating_class,
+                    ScoreBest.score,
+                    ScoreBest.pure,
+                    ScoreBest.shiny_pure,
+                    ScoreBest.far,
+                    ScoreBest.lost,
+                    Chart.constant,
+                    ScoreBest.potential,
+                )
+                .join(
+                    Chart,
+                    (Chart.song_id == ScoreBest.song_id)
+                    & (Chart.rating_class == ScoreBest.rating_class),
+                )
+                .all()
+            )
+
+            for result in results:
+                # replace the comma in song title because the target project
+                # cannot handle quoted string
+                result = list(result)
+                result[0] = result[0].replace(",", "")
+                result[2] = rating_class_to_text(result[2])
+                # divide constant to float
+                result[-2] = result[-2] / 10
+                # round potential
+                result[-1] = round(result[-1], 5)
+                csv_rows.append(result)
+
+        return csv_rows
--- a/src/arcaea_offline/models/init.py
+++ b/src/arcaea_offline/models/init.py
@ -0,0 +1,21 @@
+from .config import ConfigBase, Property
+from .scores import (
+    CalculatedPotential,
+    Score,
+    ScoreBest,
+    ScoreCalculated,
+    ScoresBase,
+    ScoresViewBase,
+)
+from .songs import (
+    Chart,
+    ChartInfo,
+    Difficulty,
+    DifficultyLocalized,
+    Pack,
+    PackLocalized,
+    Song,
+    SongLocalized,
+    SongsBase,
+    SongsViewBase,
+)
--- a/src/arcaea_offline/models/config.py
+++ b/src/arcaea_offline/models/config.py
@ -14,7 +14,7 @@ class ConfigBase(DeclarativeBase, ReprHelper):


 class Property(ConfigBase):
-    __tablename__ = "property"
+    __tablename__ = "properties"

    key: Mapped[str] = mapped_column(TEXT(), primary_key=True)
    value: Mapped[str] = mapped_column(TEXT())
--- a/src/arcaea_offline/models/scores.py
+++ b/src/arcaea_offline/models/scores.py
@ -1,18 +1,18 @@
 from typing import Optional

-from sqlalchemy import TEXT, case, func, inspect, select
+from sqlalchemy import TEXT, case, func, inspect, select, text
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
 from sqlalchemy_utils import create_view

 from .common import ReprHelper
-from .songs import Chart, ChartInfo
+from .songs import ChartInfo, Difficulty

 __all__ = [
    "ScoresBase",
    "Score",
    "ScoresViewBase",
-    "Calculated",
-    "Best",
+    "ScoreCalculated",
+    "ScoreBest",
    "CalculatedPotential",
 ]

@ -22,7 +22,7 @@ class ScoresBase(DeclarativeBase, ReprHelper):


 class Score(ScoresBase):
-    __tablename__ = "score"
+    __tablename__ = "scores"

    id: Mapped[int] = mapped_column(autoincrement=True, primary_key=True)
    song_id: Mapped[str] = mapped_column(TEXT())
@ -33,9 +33,13 @@ class Score(ScoresBase):
    lost: Mapped[Optional[int]]
    date: Mapped[Optional[int]]
    max_recall: Mapped[Optional[int]]
-    r10_clear_type: Mapped[Optional[int]] = mapped_column(
-        comment="0: LOST, 1: COMPLETE, 2: HARD_LOST"
+    modifier: Mapped[Optional[int]] = mapped_column(
+        comment="0: NORMAL, 1: EASY, 2: HARD"
    )
+    clear_type: Mapped[Optional[int]] = mapped_column(
+        comment="0: TRACK LOST, 1: NORMAL CLEAR, 2: FULL RECALL, 3: PURE MEMORY, 4: EASY CLEAR, 5: HARD CLEAR"
+    )
+    comment: Mapped[Optional[str]] = mapped_column(TEXT())


 # How to create an SQL View with SQLAlchemy?
@ -47,40 +51,56 @@ class ScoresViewBase(DeclarativeBase, ReprHelper):
    pass


-class Calculated(ScoresViewBase):
-    score_id: Mapped[str]
+class ScoreCalculated(ScoresViewBase):
+    __tablename__ = "scores_calculated"
+
+    id: Mapped[int]
    song_id: Mapped[str]
    rating_class: Mapped[int]
    score: Mapped[int]
    pure: Mapped[Optional[int]]
+    shiny_pure: Mapped[Optional[int]]
    far: Mapped[Optional[int]]
    lost: Mapped[Optional[int]]
    date: Mapped[Optional[int]]
    max_recall: Mapped[Optional[int]]
-    r10_clear_type: Mapped[Optional[int]]
-    shiny_pure: Mapped[Optional[int]]
+    modifier: Mapped[Optional[int]]
+    clear_type: Mapped[Optional[int]]
    potential: Mapped[float]
+    comment: Mapped[Optional[str]]

    __table__ = create_view(
-        name="calculated",
+        name=__tablename__,
        selectable=select(
-            Score.id.label("score_id"),
-            Chart.song_id,
-            Chart.rating_class,
+            Score.id,
+            Difficulty.song_id,
+            Difficulty.rating_class,
            Score.score,
            Score.pure,
+            (
+                case(
+                    (
+                        (
+                            ChartInfo.notes.is_not(None)
+                            & Score.pure.is_not(None)
+                            & Score.far.is_not(None)
+                            & (ChartInfo.notes != 0)
+                        ),
+                        Score.score
+                        - func.floor(
+                            (Score.pure * 10000000.0 / ChartInfo.notes)
+                            + (Score.far * 0.5 * 10000000.0 / ChartInfo.notes)
+                        ),
+                    ),
+                    else_=text("NULL"),
+                )
+            ).label("shiny_pure"),
            Score.far,
            Score.lost,
            Score.date,
            Score.max_recall,
-            Score.r10_clear_type,
-            (
-                Score.score
-                - func.floor(
-                    (Score.pure * 10000000.0 / ChartInfo.note)
-                    + (Score.far * 0.5 * 10000000.0 / ChartInfo.note)
-                )
-            ).label("shiny_pure"),
+            Score.modifier,
+            Score.clear_type,
            case(
                (Score.score >= 10000000, ChartInfo.constant / 10.0 + 2),
                (
@ -92,62 +112,73 @@ class Calculated(ScoresViewBase):
                    0,
                ),
            ).label("potential"),
+            Score.comment,
        )
-        .select_from(Chart)
+        .select_from(Difficulty)
        .join(
            ChartInfo,
-            (Chart.song_id == ChartInfo.song_id)
-            & (Chart.rating_class == ChartInfo.rating_class),
+            (Difficulty.song_id == ChartInfo.song_id)
+            & (Difficulty.rating_class == ChartInfo.rating_class),
        )
        .join(
            Score,
-            (Chart.song_id == Score.song_id)
-            & (Chart.rating_class == Score.rating_class),
+            (Difficulty.song_id == Score.song_id)
+            & (Difficulty.rating_class == Score.rating_class),
        ),
        metadata=ScoresViewBase.metadata,
        cascade_on_drop=False,
    )


-class Best(ScoresViewBase):
-    score_id: Mapped[str]
+class ScoreBest(ScoresViewBase):
+    __tablename__ = "scores_best"
+
+    id: Mapped[int]
    song_id: Mapped[str]
    rating_class: Mapped[int]
    score: Mapped[int]
    pure: Mapped[Optional[int]]
+    shiny_pure: Mapped[Optional[int]]
    far: Mapped[Optional[int]]
    lost: Mapped[Optional[int]]
    date: Mapped[Optional[int]]
    max_recall: Mapped[Optional[int]]
-    r10_clear_type: Mapped[Optional[int]]
-    shiny_pure: Mapped[Optional[int]]
+    modifier: Mapped[Optional[int]]
+    clear_type: Mapped[Optional[int]]
    potential: Mapped[float]
+    comment: Mapped[Optional[str]]

    __table__ = create_view(
-        name="best",
+        name=__tablename__,
        selectable=select(
-            *[col for col in inspect(Calculated).columns if col.name != "potential"],
-            func.max(Calculated.potential).label("potential"),
+            *[
+                col
+                for col in inspect(ScoreCalculated).columns
+                if col.name != "potential"
+            ],
+            func.max(ScoreCalculated.potential).label("potential"),
        )
-        .select_from(Calculated)
-        .group_by(Calculated.song_id, Calculated.rating_class)
-        .order_by(Calculated.potential.desc()),
+        .select_from(ScoreCalculated)
+        .group_by(ScoreCalculated.song_id, ScoreCalculated.rating_class)
+        .order_by(ScoreCalculated.potential.desc()),
        metadata=ScoresViewBase.metadata,
        cascade_on_drop=False,
    )


 class CalculatedPotential(ScoresViewBase):
+    __tablename__ = "calculated_potential"
+
    b30: Mapped[float]

    _select_bests_subquery = (
-        select(Best.potential.label("b30_sum"))
-        .order_by(Best.potential.desc())
+        select(ScoreBest.potential.label("b30_sum"))
+        .order_by(ScoreBest.potential.desc())
        .limit(30)
        .subquery()
    )
    __table__ = create_view(
-        name="calculated_potential",
+        name=__tablename__,
        selectable=select(func.avg(_select_bests_subquery.c.b30_sum).label("b30")),
        metadata=ScoresViewBase.metadata,
        cascade_on_drop=False,
--- a/src/arcaea_offline/models/songs.py
+++ b/src/arcaea_offline/models/songs.py
@ -1,7 +1,8 @@
 from typing import Optional

-from sqlalchemy import TEXT, ForeignKey
+from sqlalchemy import TEXT, ForeignKey, func, select
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
+from sqlalchemy_utils import create_view

 from .common import ReprHelper

@ -11,9 +12,11 @@ __all__ = [
    "PackLocalized",
    "Song",
    "SongLocalized",
-    "Chart",
-    "ChartLocalized",
+    "Difficulty",
+    "DifficultyLocalized",
    "ChartInfo",
+    "SongsViewBase",
+    "Chart",
 ]


@ -22,7 +25,7 @@ class SongsBase(DeclarativeBase, ReprHelper):


 class Pack(SongsBase):
-    __tablename__ = "pack"
+    __tablename__ = "packs"

    id: Mapped[str] = mapped_column(TEXT(), primary_key=True)
    name: Mapped[str] = mapped_column(TEXT())
@ -30,9 +33,9 @@ class Pack(SongsBase):


 class PackLocalized(SongsBase):
-    __tablename__ = "pack_localized"
+    __tablename__ = "packs_localized"

-    id: Mapped[str] = mapped_column(ForeignKey("pack.id"), primary_key=True)
+    id: Mapped[str] = mapped_column(ForeignKey("packs.id"), primary_key=True)
    name_ja: Mapped[Optional[str]] = mapped_column(TEXT())
    name_ko: Mapped[Optional[str]] = mapped_column(TEXT())
    name_zh_hans: Mapped[Optional[str]] = mapped_column(TEXT())
@ -44,7 +47,7 @@ class PackLocalized(SongsBase):


 class Song(SongsBase):
-    __tablename__ = "song"
+    __tablename__ = "songs"

    idx: Mapped[int]
    id: Mapped[str] = mapped_column(TEXT(), primary_key=True)
@ -67,29 +70,41 @@ class Song(SongsBase):


 class SongLocalized(SongsBase):
-    __tablename__ = "song_localized"
+    __tablename__ = "songs_localized"

-    id: Mapped[str] = mapped_column(ForeignKey("song.id"), primary_key=True)
+    id: Mapped[str] = mapped_column(ForeignKey("songs.id"), primary_key=True)
    title_ja: Mapped[Optional[str]] = mapped_column(TEXT())
    title_ko: Mapped[Optional[str]] = mapped_column(TEXT())
    title_zh_hans: Mapped[Optional[str]] = mapped_column(TEXT())
    title_zh_hant: Mapped[Optional[str]] = mapped_column(TEXT())
-    search_title_ja: Mapped[Optional[str]] = mapped_column(TEXT(), comment="json")
-    search_title_ko: Mapped[Optional[str]] = mapped_column(TEXT(), comment="json")
-    search_title_zh_hans: Mapped[Optional[str]] = mapped_column(TEXT(), comment="json")
-    search_title_zh_hant: Mapped[Optional[str]] = mapped_column(TEXT(), comment="json")
-    search_artist_ja: Mapped[Optional[str]] = mapped_column(TEXT(), comment="json")
-    search_artist_ko: Mapped[Optional[str]] = mapped_column(TEXT(), comment="json")
-    search_artist_zh_hans: Mapped[Optional[str]] = mapped_column(TEXT(), comment="json")
-    search_artist_zh_hant: Mapped[Optional[str]] = mapped_column(TEXT(), comment="json")
+    search_title_ja: Mapped[Optional[str]] = mapped_column(TEXT(), comment="JSON array")
+    search_title_ko: Mapped[Optional[str]] = mapped_column(TEXT(), comment="JSON array")
+    search_title_zh_hans: Mapped[Optional[str]] = mapped_column(
+        TEXT(), comment="JSON array"
+    )
+    search_title_zh_hant: Mapped[Optional[str]] = mapped_column(
+        TEXT(), comment="JSON array"
+    )
+    search_artist_ja: Mapped[Optional[str]] = mapped_column(
+        TEXT(), comment="JSON array"
+    )
+    search_artist_ko: Mapped[Optional[str]] = mapped_column(
+        TEXT(), comment="JSON array"
+    )
+    search_artist_zh_hans: Mapped[Optional[str]] = mapped_column(
+        TEXT(), comment="JSON array"
+    )
+    search_artist_zh_hant: Mapped[Optional[str]] = mapped_column(
+        TEXT(), comment="JSON array"
+    )
    source_ja: Mapped[Optional[str]] = mapped_column(TEXT())
    source_ko: Mapped[Optional[str]] = mapped_column(TEXT())
    source_zh_hans: Mapped[Optional[str]] = mapped_column(TEXT())
    source_zh_hant: Mapped[Optional[str]] = mapped_column(TEXT())


-class Chart(SongsBase):
-    __tablename__ = "chart"
+class Difficulty(SongsBase):
+    __tablename__ = "difficulties"

    song_id: Mapped[str] = mapped_column(TEXT(), primary_key=True)
    rating_class: Mapped[int] = mapped_column(primary_key=True)
@ -110,12 +125,14 @@ class Chart(SongsBase):
    date: Mapped[Optional[int]]


-class ChartLocalized(SongsBase):
-    __tablename__ = "chart_localized"
+class DifficultyLocalized(SongsBase):
+    __tablename__ = "difficulties_localized"

-    song_id: Mapped[str] = mapped_column(ForeignKey("chart.song_id"), primary_key=True)
+    song_id: Mapped[str] = mapped_column(
+        ForeignKey("difficulties.song_id"), primary_key=True
+    )
    rating_class: Mapped[str] = mapped_column(
-        ForeignKey("chart.rating_class"), primary_key=True
+        ForeignKey("difficulties.rating_class"), primary_key=True
    )
    title_ja: Mapped[Optional[str]] = mapped_column(TEXT())
    title_ko: Mapped[Optional[str]] = mapped_column(TEXT())
@ -128,13 +145,95 @@ class ChartLocalized(SongsBase):


 class ChartInfo(SongsBase):
-    __tablename__ = "chart_info"
+    __tablename__ = "charts_info"

-    song_id: Mapped[str] = mapped_column(ForeignKey("chart.song_id"), primary_key=True)
+    song_id: Mapped[str] = mapped_column(
+        ForeignKey("difficulties.song_id"), primary_key=True
+    )
    rating_class: Mapped[str] = mapped_column(
-        ForeignKey("chart.rating_class"), primary_key=True
+        ForeignKey("difficulties.rating_class"), primary_key=True
    )
    constant: Mapped[int] = mapped_column(
        comment="real_constant * 10. For example, Crimson Throne [FTR] is 10.4, then store 104 here."
    )
-    note: Mapped[Optional[int]]
+    notes: Mapped[Optional[int]]
+
+
+class SongsViewBase(DeclarativeBase, ReprHelper):
+    pass
+
+
+class Chart(SongsViewBase):
+    __tablename__ = "charts"
+
+    song_idx: Mapped[int]
+    song_id: Mapped[str]
+    rating_class: Mapped[int]
+    rating: Mapped[int]
+    rating_plus: Mapped[bool]
+    title: Mapped[str]
+    artist: Mapped[str]
+    set: Mapped[str]
+    bpm: Mapped[Optional[str]]
+    bpm_base: Mapped[Optional[float]]
+    audio_preview: Mapped[Optional[int]]
+    audio_preview_end: Mapped[Optional[int]]
+    side: Mapped[Optional[int]]
+    version: Mapped[Optional[str]]
+    date: Mapped[Optional[int]]
+    bg: Mapped[Optional[str]]
+    bg_inverse: Mapped[Optional[str]]
+    bg_day: Mapped[Optional[str]]
+    bg_night: Mapped[Optional[str]]
+    source: Mapped[Optional[str]]
+    source_copyright: Mapped[Optional[str]]
+    chart_designer: Mapped[Optional[str]]
+    jacket_desginer: Mapped[Optional[str]]
+    audio_override: Mapped[bool]
+    jacket_override: Mapped[bool]
+    jacket_night: Mapped[Optional[str]]
+    constant: Mapped[int]
+    notes: Mapped[Optional[int]]
+
+    __table__ = create_view(
+        name=__tablename__,
+        selectable=select(
+            Song.idx.label("song_idx"),
+            Difficulty.song_id,
+            Difficulty.rating_class,
+            Difficulty.rating,
+            Difficulty.rating_plus,
+            func.coalesce(Difficulty.title, Song.title).label("title"),
+            func.coalesce(Difficulty.artist, Song.artist).label("artist"),
+            Song.set,
+            func.coalesce(Difficulty.bpm, Song.bpm).label("bpm"),
+            func.coalesce(Difficulty.bpm_base, Song.bpm_base).label("bpm_base"),
+            Song.audio_preview,
+            Song.audio_preview_end,
+            Song.side,
+            func.coalesce(Difficulty.version, Song.version).label("version"),
+            func.coalesce(Difficulty.date, Song.date).label("date"),
+            func.coalesce(Difficulty.bg, Song.bg).label("bg"),
+            func.coalesce(Difficulty.bg_inverse, Song.bg_inverse).label("bg_inverse"),
+            Song.bg_day,
+            Song.bg_night,
+            Song.source,
+            Song.source_copyright,
+            Difficulty.chart_designer,
+            Difficulty.jacket_desginer,
+            Difficulty.audio_override,
+            Difficulty.jacket_override,
+            Difficulty.jacket_night,
+            ChartInfo.constant,
+            ChartInfo.notes,
+        )
+        .select_from(Difficulty)
+        .join(
+            ChartInfo,
+            (Difficulty.song_id == ChartInfo.song_id)
+            & (Difficulty.rating_class == ChartInfo.rating_class),
+        )
+        .join(Song, Difficulty.song_id == Song.id),
+        metadata=SongsViewBase.metadata,
+        cascade_on_drop=False,
+    )
--- a/src/arcaea_offline/searcher.py
+++ b/src/arcaea_offline/searcher.py
@ -0,0 +1,111 @@
+from typing import List, Union
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+from whoosh.analysis import NgramFilter, StandardAnalyzer
+from whoosh.fields import ID, KEYWORD, TEXT, Schema
+from whoosh.filedb.filestore import RamStorage
+from whoosh.qparser import FuzzyTermPlugin, MultifieldParser, OrGroup
+
+from .models.songs import Song, SongLocalized
+from .utils.search_title import recover_search_title
+
+
+class Searcher:
+    def __init__(self):
+        self.text_analyzer = StandardAnalyzer() | NgramFilter(minsize=2, maxsize=5)
+        self.song_schema = Schema(
+            song_id=ID(stored=True, unique=True),
+            title=TEXT(analyzer=self.text_analyzer, spelling=True),
+            artist=TEXT(analyzer=self.text_analyzer, spelling=True),
+            source=TEXT(analyzer=self.text_analyzer, spelling=True),
+            keywords=KEYWORD(lowercase=True, stored=True, scorable=True),
+        )
+        self.storage = RamStorage()
+        self.index = self.storage.create_index(self.song_schema)
+
+        self.default_query_parser = MultifieldParser(
+            ["song_id", "title", "artist", "source", "keywords"],
+            self.song_schema,
+            group=OrGroup,
+        )
+        self.default_query_parser.add_plugin(FuzzyTermPlugin())
+
+    def import_songs(self, session: Session):
+        writer = self.index.writer()
+        songs = list(session.scalars(select(Song)))
+        song_localize_stmt = select(SongLocalized)
+        for song in songs:
+            stmt = song_localize_stmt.where(SongLocalized.id == song.id)
+            sl = session.scalar(stmt)
+            song_id = song.id
+            possible_titles: List[Union[str, None]] = [song.title]
+            possible_artists: List[Union[str, None]] = [song.artist]
+            possible_sources: List[Union[str, None]] = [song.source]
+            if sl:
+                possible_titles.extend(
+                    [sl.title_ja, sl.title_ko, sl.title_zh_hans, sl.title_zh_hant]
+                )
+                possible_titles.extend(
+                    recover_search_title(sl.search_title_ja)
+                    + recover_search_title(sl.search_title_ko)
+                    + recover_search_title(sl.search_title_zh_hans)
+                    + recover_search_title(sl.search_title_zh_hant)
+                )
+                possible_artists.extend(
+                    recover_search_title(sl.search_artist_ja)
+                    + recover_search_title(sl.search_artist_ko)
+                    + recover_search_title(sl.search_artist_zh_hans)
+                    + recover_search_title(sl.search_artist_zh_hant)
+                )
+                possible_sources.extend(
+                    [
+                        sl.source_ja,
+                        sl.source_ko,
+                        sl.source_zh_hans,
+                        sl.source_zh_hant,
+                    ]
+                )
+
+            # remove empty items in list
+            titles = [t for t in possible_titles if t != "" and t is not None]
+            artists = [t for t in possible_artists if t != "" and t is not None]
+            sources = [t for t in possible_sources if t != "" and t is not None]
+
+            writer.update_document(
+                song_id=song_id,
+                title=" ".join(titles),
+                artist=" ".join(artists),
+                source=" ".join(sources),
+                keywords=" ".join([song_id] + titles + artists + sources),
+            )
+
+        writer.commit()
+
+    def did_you_mean(self, string: str):
+        results = set()
+
+        with self.index.searcher() as searcher:
+            corrector_keywords = searcher.corrector("keywords")  # type: ignore
+            corrector_song_id = searcher.corrector("song_id")  # type: ignore
+            corrector_title = searcher.corrector("title")  # type: ignore
+            corrector_artist = searcher.corrector("artist")  # type: ignore
+            corrector_source = searcher.corrector("source")  # type: ignore
+
+            results.update(corrector_keywords.suggest(string))
+            results.update(corrector_song_id.suggest(string))
+            results.update(corrector_title.suggest(string))
+            results.update(corrector_artist.suggest(string))
+            results.update(corrector_source.suggest(string))
+
+        if string in results:
+            results.remove(string)
+
+        return list(results)
+
+    def search(self, string: str, *, limit: int = 10, fuzzy_distance: int = 10):
+        query_string = f"{string}"
+        query = self.default_query_parser.parse(query_string)
+        with self.index.searcher() as searcher:
+            results = searcher.search(query, limit=limit)
+            return [result.get("song_id") for result in results]
--- a/src/arcaea_offline/utils/init.py
+++ b/src/arcaea_offline/utils/init.py
--- a/src/arcaea_offline/utils/partner.py
+++ b/src/arcaea_offline/utils/partner.py
@ -0,0 +1,15 @@
+from datetime import datetime
+from enum import IntEnum
+
+
+class KanaeDayNight(IntEnum):
+    Day = 0
+    Night = 1
+
+
+def kanae_day_night(timestamp: int) -> KanaeDayNight:
+    """
+    :param timestamp: POSIX timestamp, which is passed to `datetime.fromtimestamp(timestamp)`.
+    """
+    dt = datetime.fromtimestamp(timestamp)
+    return KanaeDayNight.Day if 6 <= dt.hour <= 19 else KanaeDayNight.Night
--- a/src/arcaea_offline/utils/rating.py
+++ b/src/arcaea_offline/utils/rating.py
@ -0,0 +1,23 @@
+from typing import Optional
+
+RATING_CLASS_TEXT_MAP = {
+    0: "Past",
+    1: "Present",
+    2: "Future",
+    3: "Beyond",
+}
+
+RATING_CLASS_SHORT_TEXT_MAP = {
+    0: "PST",
+    1: "PRS",
+    2: "FTR",
+    3: "BYD",
+}
+
+
+def rating_class_to_text(rating_class: int) -> Optional[str]:
+    return RATING_CLASS_TEXT_MAP.get(rating_class)
+
+
+def rating_class_to_short_text(rating_class: int) -> Optional[str]:
+    return RATING_CLASS_SHORT_TEXT_MAP.get(rating_class)
--- a/src/arcaea_offline/utils/score.py
+++ b/src/arcaea_offline/utils/score.py
@ -0,0 +1,46 @@
+from typing import Any, Sequence
+
+SCORE_GRADE_FLOOR = [9900000, 9800000, 9500000, 9200000, 8900000, 8600000, 0]
+SCORE_GRADE_TEXTS = ["EX+", "EX", "AA", "A", "B", "C", "D"]
+MODIFIER_TEXTS = ["NORMAL", "EASY", "HARD"]
+CLEAR_TYPE_TEXTS = [
+    "TRACK LOST",
+    "NORMAL CLEAR",
+    "FULL RECALL",
+    "PURE MEMORY",
+    "EASY CLEAR",
+    "HARD CLEAR",
+]
+
+
+def zip_score_grade(score: int, __seq: Sequence, default: Any = "__PRESERVE__"):
+    """
+    zip_score_grade is a simple wrapper that equals to:
+    ```py
+    for score_floor, val in zip(SCORE_GRADE_FLOOR, __seq):
+        if score >= score_floor:
+            return val
+    return seq[-1] if default == "__PRESERVE__" else default
+    ```
+    Could be useful in specific cases.
+    """
+    return next(
+        (
+            val
+            for score_floor, val in zip(SCORE_GRADE_FLOOR, __seq)
+            if score >= score_floor
+        ),
+        __seq[-1] if default == "__PRESERVE__" else default,
+    )
+
+
+def score_to_grade_text(score: int) -> str:
+    return zip_score_grade(score, SCORE_GRADE_TEXTS)
+
+
+def modifier_to_text(modifier: int) -> str:
+    return MODIFIER_TEXTS[modifier]
+
+
+def clear_type_to_text(clear_type: int) -> str:
+    return CLEAR_TYPE_TEXTS[clear_type]
--- a/src/arcaea_offline/utils/search_title.py
+++ b/src/arcaea_offline/utils/search_title.py
@ -0,0 +1,6 @@
+import json
+from typing import List, Optional
+
+
+def recover_search_title(db_value: Optional[str]) -> List[str]:
+    return json.loads(db_value) if db_value else []
Author	SHA1	Message	Date
283375	0764308638	chore: v0.2.1	2023-11-01 14:09:44 +08:00
283375	e5c1e0ef4a	fix(external): `fix_timestamp` digits counting (#3 )	2023-10-27 00:23:17 +08:00
283375	8c48d76c65	feat(external): add support for smartrte.github.io	2023-10-21 21:38:47 +08:00
283375	d79c73df8c	impr(external): Andreal B30 overflow data	2023-10-21 20:58:40 +08:00
283375	7a64ec4a4a	fix(models): null value checking	2023-10-21 19:03:21 +08:00
283375	a9f8ba6e22	impr(external): `St3ScoreParser` improvements	2023-10-18 01:21:27 +08:00
283375	13ea4d9e97	fix(external): `fix_timestamp` current timestamp digits counting	2023-10-18 01:17:12 +08:00
283375	24d46e4615	feat(external): Online parser	2023-10-18 01:08:48 +08:00
283375	62c85e9e82	fix(models): null value checking	2023-10-16 01:14:34 +08:00
283375	c7de60ee03	feat(utils): Kanae day/night util	2023-10-12 17:05:33 +08:00
283375	7c000d01cb	feat(utils): text converters	2023-10-12 16:21:37 +08:00
283375	5190d614c2	chore: v0.2.0	2023-09-24 03:30:20 +08:00
283375	a4daa9899a	chore: logo and README	2023-09-24 03:23:15 +08:00
283375	179d5783cb	chore!: license MIT -> GPLv3	2023-09-24 02:52:43 +08:00
283375	3b6134f063	chore(calc)!: use integer for `constant` argument	2023-09-23 21:57:33 +08:00
283375	6ec3acb145	wip: searcher	2023-09-23 21:55:04 +08:00
283375	c1f83eff55	feat(db): `get_score_best`	2023-09-23 17:51:50 +08:00
283375	3349620b3a	impr(db): better `recommend_charts`	2023-09-23 17:51:32 +08:00
283375	3867b273c7	impr(calc): negative result of `play_rating_from_step`	2023-09-21 11:36:00 +08:00
283375	0c292fc3be	chore(calc)!: api changes - `PlayResults` -> `PlayResult` - remove expose of `world_step` from `calculate.__init__`	2023-09-20 00:20:32 +08:00
283375	2c73570a65	fix(calc): default value of `PartnerBonus.step_bonus`	2023-09-18 20:50:18 +08:00
283375	ec9926993c	feat(db): recommend charts based on score	2023-09-18 20:41:57 +08:00
283375	bed9e14368	chore(calc)!: `potential` -> `play_rating`	2023-09-18 14:05:28 +08:00
283375	f72410d0bc	feat(calc): calculate constants from potential	2023-09-18 14:02:33 +08:00
283375	64fd328ff8	feat(calc): calculate potential from world step	2023-09-18 14:02:02 +08:00
283375	a97031e717	wip(calc): world step calculation	2023-09-18 09:25:15 +08:00
283375	c6014bd1b6	chore(calc): split `calculate` module	2023-09-18 07:58:35 +08:00
283375	c909886902	feat(db): `get_songs_by_pack_id`	2023-09-17 00:27:20 +08:00
283375	589826004b	fix(db): minor fixes	2023-09-17 00:26:56 +08:00
283375	4899e0383f	fix(external): `SonglistDifficultiesParser` file reading	2023-09-16 20:31:38 +08:00
283375	5796d9a80f	impr(external): `ArcaeaParser` file reading	2023-09-16 02:40:56 +08:00
283375	6258a55ba4	fix(eternal): fix Andreal score timestamp	2023-09-08 18:16:58 +08:00
283375	d763896c0c	feat(db): `Score` related modify methods	2023-09-06 01:10:47 +08:00
283375	c2a171a6d3	chore(db)!: `Database` method rename	2023-09-06 00:30:24 +08:00
283375	d36a858464	feat(db): new methods	2023-09-06 00:01:18 +08:00
283375	66a4cc8cff	impr(external): Andreal B30 `best30_overflow` field	2023-09-02 18:15:22 +08:00
283375	00255e5b74	feat(external): AndrealImageGenerator	2023-09-01 02:37:39 +08:00
283375	844568db1a	feat(db): export methods	2023-08-31 22:18:11 +08:00
283375	167f72f9bb	refactor(models)!: `Score` & `ChartInfo` column changed	2023-08-31 22:12:02 +08:00
283375	01bfd0f350	feat(db): `COUNT` related methods	2023-08-31 21:51:49 +08:00
283375	0d882fa138	feat(external): `arcsong.json` generator	2023-08-31 21:25:50 +08:00
283375	daf2a46632	feat(db): `Score` related `Database` methods	2023-08-31 21:03:10 +08:00
283375	35e6fde664	fix: add static `single` pack in `PacklistParser`	2023-08-31 05:05:33 +08:00
283375	6b8a3e1565	fix(eternal): omit difficulties that have `"rating": 0`	2023-08-29 01:33:37 +08:00
283375	ca9576160f	fix(db): convert results to list before closing session	2023-08-29 01:32:26 +08:00
283375	e948b6abea	chore(db)!: `Database` methods	2023-08-28 22:54:37 +08:00
283375	1282993810	impr: module exporting	2023-08-28 22:46:28 +08:00
283375	b561cc51e0	refactor(db)!: new `charts` view & models refactor	2023-08-28 21:36:17 +08:00
283375	316b02cd1b	wip: searcher	2023-08-28 20:28:40 +08:00
283375	b180976284	feat: handy methods under `Database`	2023-08-28 00:15:34 +08:00
283375	54851549d5	feat(utils): bring utils back	2023-08-27 23:59:27 +08:00
283375	262495a580	fix: singleton `Database` behavior	2023-08-27 19:44:20 +08:00
283375	a6c1e594c4	feat(db): `Database.check_init()`	2023-08-27 00:31:44 +08:00
283375	d979b6cd10	add LICENSE	2023-08-26 22:46:51 +08:00
				`@ -0,0 +1 @@`
				`from .api_data import AndrealImageGeneratorApiDataConverter`
				`@ -0,0 +1 @@`
				`from .b30_csv import SmartRteB30CsvConverter`