from PySide6.QtCore import Property, QObject, Signal, Slot
from PySide6.QtQml import QmlElement

from core.database import Database

QML_IMPORT_NAME = "internal.ui.vm"
QML_IMPORT_MAJOR_VERSION = 1
QML_IMPORT_MINOR_VERSION = 0


@QmlElement
class OverviewViewModel(QObject):
    _void = Signal()
    b30Changed = Signal()

    def __init__(self):
        super().__init__()

        self._b30 = -1.0
        self.reload()

    @Slot()
    def reload(self):
        conn = Database()
        b30 = conn.b30
        self._b30 = b30 if b30 is not None else -1.0
        self.b30Changed.emit()

    @Property(float, fset=None)
    def b30(self):
        return self._b30