// ignore_for_file: constant_identifier_names

import 'dart:convert';
import 'dart:math';

import 'package:flutter/material.dart';

class IdUtils {
  static const String TABLE =
      'fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF';
  static const List<int> S = [11, 10, 3, 8, 4, 6]; // 位置编码表
  static const int XOR = 177451812; // 固定异或值
  static const int ADD = 8728348608; // 固定加法值
  static const List<String> r = [
    'B',
    'V',
    '1',
    '',
    '',
    '4',
    '',
    '1',
    '',
    '7',
    '',
    ''
  ];

  /// av转bv
  static String av2bv(int av) {
    int x_ = (av ^ XOR) + ADD;
    List<String> newR = [];
    newR.addAll(r);
    for (int i = 0; i < S.length; i++) {
      newR[S[i]] =
          TABLE.characters.elementAt((x_ / pow(58, i).toInt() % 58).toInt());
    }
    return newR.join();
  }

  /// bv转bv
  static int bv2av(String bv) {
    int r = 0;
    for (int i = 0; i < S.length; i++) {
      r += (TABLE.indexOf(bv.characters.elementAt(S[i])).toInt()) *
          pow(58, i).toInt();
    }
    return (r - ADD) ^ XOR;
  }

  // 匹配
  static Map<String, dynamic> matchAvorBv({String? input}) {
    final Map<String, dynamic> result = {};
    if (input == null || input.isEmpty) {
      return result;
    }
    final RegExp bvRegex = RegExp(r'BV[0-9A-Za-z]{10}', caseSensitive: false);
    final RegExp avRegex = RegExp(r'AV\d+', caseSensitive: false);

    final Iterable<Match> bvMatches = bvRegex.allMatches(input);
    final Iterable<Match> avMatches = avRegex.allMatches(input);

    final List<String> bvs =
        bvMatches.map((Match match) => match.group(0)!).toList();
    final List<String> avs =
        avMatches.map((Match match) => match.group(0)!).toList();

    if (bvs.isNotEmpty) {
      result['BV'] = bvs[0].substring(0, 2).toUpperCase() + bvs[0].substring(2);
    }
    if (avs.isNotEmpty) {
      result['AV'] = int.parse(avs[0].substring(2));
    }
    return result;
  }

  // eid生成
  static String? genAuroraEid(int uid) {
    if (uid == 0) {
      return null;
    }
    String uidString = uid.toString();
    List<int> resultBytes = List.generate(
      uidString.length,
      (i) => uidString.codeUnitAt(i) ^ "ad1va46a7lza".codeUnitAt(i % 12),
    );
    String auroraEid = base64Url.encode(resultBytes);
    auroraEid = auroraEid.replaceAll(RegExp(r'=*$', multiLine: true), '');
    return auroraEid;
  }
}