import json
import os
from PyQt6.QtCore import Qt, pyqtSlot
from PyQt6.QtWidgets import QDialog, QListWidgetItem, QAbstractItemView
from PyQt6.QtMultimedia import QMediaDevices
from ui.Preferences import Ui_Dialog

class Preferences(QDialog, Ui_Dialog):
    _instance = None
    def __new__(cls):
        if cls._instance:
            return cls._instance
        cls._instance = super(Preferences, cls).__new__(cls)
        return cls._instance
    @pyqtSlot(int)
    def done(self,r):
        self.hide()
        super().done(r)
        return
    @pyqtSlot()
    def exec(self):
        self.show()
        super().exec()
        return
    @pyqtSlot()
    def open(self):
        self.show()
        super().open()
        return

    def __init__(self, *args, **kwargs):
        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)
        self.setCurrent()
        return

    def setCurrent(self):
        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' ]
            }
        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.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:str =None):
        if not name:
            return self.preferences
        return self.preferences[name]
    
    def accept(self):
        self.preferences['readerFont'] = self.readerCombo.currentFont().family()
        self.preferences['phoneticFont'] =self.phoneticsCombo.currentFont().family()
        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)
        super().accept()
        return