import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import 'shared/settings_persistence.dart';

enum HeaderMode { solid, frosted }


enum StartupPage { home, servers, aggregated, discover, settings }


const String kStartupPageKey = 'smplayer.startup_page';


StartupPage parseStartupPage(String? s) => switch (s) {
  'servers' => StartupPage.servers,
  'aggregated' => StartupPage.aggregated,
  'discover' => StartupPage.discover,
  'settings' => StartupPage.settings,
  _ => StartupPage.home,
};


String startupPageToStr(StartupPage p) => switch (p) {
  StartupPage.home => 'home',
  StartupPage.servers => 'servers',
  StartupPage.aggregated => 'aggregated',
  StartupPage.discover => 'discover',
  StartupPage.settings => 'settings',
};


String startupPagePath(StartupPage p) => switch (p) {
  StartupPage.home => '/',
  StartupPage.servers => '/servers',
  StartupPage.aggregated => '/aggregated',
  StartupPage.discover => '/discover',
  StartupPage.settings => '/settings',
};

class AppearanceState {
  final ThemeMode themeMode;
  final HeaderMode headerMode;
  final StartupPage startupPage;

  const AppearanceState({
    this.themeMode = ThemeMode.system,
    this.headerMode = HeaderMode.frosted,
    this.startupPage = StartupPage.home,
  });

  AppearanceState copyWith({
    ThemeMode? themeMode,
    HeaderMode? headerMode,
    StartupPage? startupPage,
  }) => AppearanceState(
    themeMode: themeMode ?? this.themeMode,
    headerMode: headerMode ?? this.headerMode,
    startupPage: startupPage ?? this.startupPage,
  );
}

class AppearanceNotifier extends AsyncNotifier<AppearanceState>
    with SettingsPersistence {
  static const _keyMode = 'smplayer.theme_mode';
  static const _keyHeader = 'smplayer.header_mode';

  @override
  Future<AppearanceState> build() async {
    final prefs = await getPrefs();
    final raw = prefs.getString(_keyMode) ?? 'system';
    final rawHeader = prefs.getString(_keyHeader) ?? 'frosted';
    return AppearanceState(
      themeMode: _parse(raw),
      headerMode: _parseHeader(rawHeader),
      startupPage: parseStartupPage(prefs.getString(kStartupPageKey)),
    );
  }

  static ThemeMode _parse(String s) => switch (s) {
    'light' => ThemeMode.light,
    'dark' => ThemeMode.dark,
    _ => ThemeMode.system,
  };

  static String _toStr(ThemeMode m) => switch (m) {
    ThemeMode.light => 'light',
    ThemeMode.dark => 'dark',
    ThemeMode.system => 'system',
  };

  static HeaderMode _parseHeader(String s) => switch (s) {
    'solid' => HeaderMode.solid,
    'frosted' => HeaderMode.frosted,
    _ => HeaderMode.frosted,
  };

  static String _headerToStr(HeaderMode m) => switch (m) {
    HeaderMode.solid => 'solid',
    HeaderMode.frosted => 'frosted',
  };

  Future<void> setThemeMode(ThemeMode mode) async {
    final current = state.value ?? const AppearanceState();
    state = AsyncValue.data(current.copyWith(themeMode: mode));
    await persistField(_keyMode, _toStr(mode));
  }

  Future<void> setHeaderMode(HeaderMode mode) async {
    final current = state.value ?? const AppearanceState();
    state = AsyncValue.data(current.copyWith(headerMode: mode));
    await persistField(_keyHeader, _headerToStr(mode));
  }


  Future<void> setStartupPage(StartupPage page) async {
    final current = state.value ?? const AppearanceState();
    state = AsyncValue.data(current.copyWith(startupPage: page));
    await persistField(kStartupPageKey, startupPageToStr(page));
  }
}


final initialLocationProvider = Provider<String>((_) => '/');

final appearanceProvider =
    AsyncNotifierProvider<AppearanceNotifier, AppearanceState>(
      AppearanceNotifier.new,
    );