import json
import os
import re
from typing import Any, Dict, List, Optional, Self, Type, cast

from PyQt6.QtCore import (
    QCoreApplication,
    QLocale,
    QResource,
    Qt,
    QTranslator,
    pyqtSlot,
)
from PyQt6.QtMultimedia import QMediaDevices
from PyQt6.QtWidgets import QAbstractItemView, QDialog, QListWidgetItem, QWidget

from ui.Preferences import Ui_Preferences


class Preferences(QDialog, Ui_Preferences):
    translator: Optional[QTranslator]
    _instance = None
    preferences: Dict[str, str | List[str]]

    def __new__(cls: Type[Self]) -> Self:
        if cls._instance:
            return cls._instance
        cls._instance = super(Preferences, cls).__new__(cls)
        return cls._instance

    @pyqtSlot(int)
    def done(self, r: int) -> None:
        self.hide()
        super().done(r)
        return

    @pyqtSlot()
    def exec(self) -> int:
        self.show()
        return super().exec()

    @pyqtSlot()
    def open(self) -> None:
        self.show()
        super().open()
        return

    def __init__(self, *args: Any, **kwargs: Any) -> None:
        super(Preferences, self).__init__(*args, **kwargs)
        self.setupUi(self)
        self.hide()
        #
        # Overrides
        #
        self.alertList.setSelectionMode(
            QAbstractItemView.SelectionMode.MultiSelection
        )
        self.playerList.setSelectionMode(
            QAbstractItemView.SelectionMode.MultiSelection
        )
        self.readerCombo.setEditable(False)
        self.phoneticsCombo.setEditable(False)
        #
        # End OverRides
        #
        for index, output in enumerate(QMediaDevices.audioOutputs()):
            identifier = output.id().data().decode("utf-8")
            description = output.description()
            self.alertList.addItem(description)
            self.playerList.addItem(description)
        resource = QResource("/translate")
        translator = QTranslator()
        for child in resource.children():
            fn = f":/translate/{child}"
            if translator.load(fn):
                locale = QLocale(translator.language())
                lang_code = locale.language()
                language = QLocale.languageToString(lang_code)
                self.languageCombo.addItem(language, translator.language())
        self.setCurrent()
        return

    def setCurrent(self) -> None:
        if os.path.exists("preferences.json"):
            with open("preferences.json", "r") as f:
                self.preferences = json.load(f)
        else:
            self.preferences = {
                "readerFont": "OpenDyslexic",
                "phoneticFont": "Gentium",
                "alertOutputs": ["default"],
                "playerOutputs": ["Feed for virtual microphone"],
                "language": "pt",
            }
        for output in self.preferences["alertOutputs"]:
            if output == "default":
                output = QMediaDevices.defaultAudioOutput().description()
            for item in self.alertList.findItems(
                output, Qt.MatchFlag.MatchExactly
            ):
                item.setSelected(True)
        for output in self.preferences["playerOutputs"]:
            if output == "default":
                output = QMediaDevices.defaultAudioOutput().description()
            for item in self.playerList.findItems(
                output, Qt.MatchFlag.MatchExactly
            ):
                item.setSelected(True)
        index = self.languageCombo.findData(self.preferences["language"])
        if index >= 0:
            self.languageCombo.setCurrentIndex(index)
        self.translator = QTranslator()
        if self.translator.load(
            f":/translate/esl_reader_{self.preferences['language']}"
        ):
            assert self.translator is not None
            QCoreApplication.installTranslator(self.translator)
        else:
            self.translator = None
        index = self.readerCombo.findText(self.preferences["readerFont"])
        if index >= 0:
            self.readerCombo.setCurrentIndex(index)
        index = self.phoneticsCombo.findText(self.preferences["phoneticFont"])
        if index >= 0:
            self.phoneticsCombo.setCurrentIndex(index)
        return

    def get(
        self, name: Optional[str] = None
    ) -> str | List[str] | Dict[str, str | List[str]]:
        if not name:
            return self.preferences
        return self.preferences[name]

    def accept(self) -> None:
        self.preferences["readerFont"] = self.readerCombo.currentFont().family()
        self.preferences[
            "phoneticFont"
        ] = self.phoneticsCombo.currentFont().family()
        self.preferences["language"] = self.languageCombo.currentData()
        self.preferences["alertOutputs"] = [
            x.data(Qt.ItemDataRole.DisplayRole)
            for x in self.alertList.selectedItems()
        ]
        self.preferences["playerOutputs"] = [
            x.data(Qt.ItemDataRole.DisplayRole)
            for x in self.playerList.selectedItems()
        ]
        with open("preferences.json", "w") as f:
            json.dump(self.preferences, f, indent=2)
        if self.translator:
            if self.translator.language() != self.preferences["language"]:
                full_code: str = cast(str, self.preferences["language"])
                locale = QLocale(full_code)
                language = locale.language()
                code = QLocale.languageToCode(
                    language, QLocale.LanguageCodeType.ISO639Part1
                )
                print(language, code)
                fn = f":/translate/esl_reader_{code}.qm"
                translator = QTranslator()
                if translator.load(fn):
                    QCoreApplication.removeTranslator(self.translator)
                    self.translator = translator
                    QCoreApplication.installTranslator(self.translator)
                else:
                    print(self.tr("Unable to load translation file ") + f"{fn}")
        super().accept()
        return