import 'dart:ui';

import 'package:base_project/storage/storage_keys.dart';
import 'package:base_project/storage/storage_service.dart';
import 'package:base_project/theme/theme_data.dart';
import 'package:base_project/theme/theme_schema.dart';
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
import 'package:provider/provider.dart';

class ThemeManager extends ChangeNotifier {

  late ThemeSchema theme;
  late ThemeMode themeMode;

  PlatformDispatcher dispatcher = SchedulerBinding.instance.platformDispatcher;

  ThemeManager(){
    init();
  }

  void init(){
    themeMode = ThemeModeUtils.fromString(
        StorageService.getValue( StorageServiceValueType.string, StorageKeys.theme) ?? ThemeMode.system.toRawString()
    );
    dispatcher.onPlatformBrightnessChanged = _onBrightnessChanged;
    _setCurrentTheme();
  }

  void changeThemeMode( ThemeMode themeMode ){

    StorageService.setValue(StorageServiceValueType.string, StorageKeys.theme, themeMode.toRawString());

    this.themeMode = themeMode;
    _setCurrentTheme();

    notifyListeners();

  }

  void _onBrightnessChanged (){

    if( themeMode != ThemeMode.system ) return;

    if( dispatcher.platformBrightness == Brightness.light ){
      theme = LightTheme();
    }else{
      theme = DarkTheme();
    }

    notifyListeners();

  }

  void _setCurrentTheme(){

    if( themeMode == ThemeMode.system ){
      theme = dispatcher.platformBrightness == Brightness.light ? LightTheme() : DarkTheme();
    }else {
      theme = themeMode == ThemeMode.light ? LightTheme() : DarkTheme();
    }

    SystemChrome.setSystemUIOverlayStyle(
      SystemUiOverlayStyle(
        statusBarColor: Colors.transparent,
        statusBarIconBrightness: theme.brightness == Brightness.light ? Brightness.dark : Brightness.light
      )
    );

  }

  static ThemeSchema getTheme( BuildContext context, { bool listen = true } ){
    return listen ? context.watch<ThemeManager>().theme : context.read<ThemeManager>().theme;
  }

}

class ThemeModeUtils {

  ThemeModeUtils._();

  static ThemeMode fromString( String themeModeString ){
    Map<String, ThemeMode> data = {
      'light': ThemeMode.light,
      'dark': ThemeMode.dark,
      'system': ThemeMode.system
    };
    return data[themeModeString]!;
  }

}

extension ThemeModeExtention on ThemeMode {

  String toRawString(){
    return toString().split('.').last;
  }

}