/// ============================================================
/// 闲言APP — 桌面小部件状态管理
/// 创建时间: 2026-05-19
/// 更新时间: 2026-06-12
/// 作用: 管理小部件安装状态、数据推送和交互
/// 上次更新: 从providers/子目录提升至widget根目录
/// ============================================================

import 'dart:ui';

import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:home_widget/home_widget.dart';
import 'package:xianyan/core/utils/platform/platform_utils.dart' as pu;
import 'package:xianyan/core/utils/platform/platform_capability.dart';

import '../../../core/services/data/home_widget_service.dart';
import '../../../core/utils/logger.dart';
import 'widget_type.dart';

enum PinWidgetResult { success, unsupported, failed }

class WidgetState {
  final Set<WidgetType> installedWidgets;
  final bool isLoading;
  final String? error;

  const WidgetState({
    this.installedWidgets = const {},
    this.isLoading = false,
    this.error,
  });

  WidgetState copyWith({
    Set<WidgetType>? installedWidgets,
    bool? isLoading,
    String? error,
  }) => WidgetState(
    installedWidgets: installedWidgets ?? this.installedWidgets,
    isLoading: isLoading ?? this.isLoading,
    error: error,
  );
}

class WidgetNotifier extends Notifier<WidgetState> {
  @override
  WidgetState build() => const WidgetState();

  Future<void> loadInstalledWidgets() async {
    // [PlatformCapabilities] 统一能力查询: homeWidget
    // macOS/Windows/Linux/Web 端 home_widget 插件无原生实现，调用会抛 MissingPluginException
    if (pu.isOhos || !PlatformCapabilities.supports(CapabilityKey.homeWidget)) {
      Log.w('WidgetNotifier: 当前平台不支持桌面小部件，跳过加载');
      state = state.copyWith(isLoading: false);
      return;
    }

    state = state.copyWith(isLoading: true);
    try {
      final widgets = await HomeWidget.getInstalledWidgets();
      final installed = <WidgetType>{};

      for (final w in widgets) {
        final kind = w.iOSKind ?? w.androidClassName ?? '';
        for (final type in WidgetType.values) {
          if (kind.contains(type.androidProviderName) ||
              kind.contains(type.iosWidgetKind) ||
              kind.contains(type.ohosFormName)) {
            installed.add(type);
          }
        }
      }

      state = state.copyWith(installedWidgets: installed, isLoading: false);
      Log.i('WidgetNotifier: 已安装 ${installed.length} 个小部件');
    } catch (e) {
      Log.e('WidgetNotifier: 加载小部件失败', e);
      state = state.copyWith(isLoading: false, error: e.toString());
    }
  }

  Future<void> addWidget(WidgetType type) async {
    try {
      final service = ref.read(homeWidgetServiceProvider);
      await service.init();
      await service.updateWidget(type);
      final isDark =
          PlatformDispatcher.instance.platformBrightness == Brightness.dark;
      await service.pushThemeMode(isDark);
      final newInstalled = {...state.installedWidgets, type};
      state = state.copyWith(installedWidgets: newInstalled);
      Log.i('WidgetNotifier: 添加小部件 ${type.title}');
    } catch (e) {
      Log.e('WidgetNotifier: 添加小部件失败', e);
      state = state.copyWith(error: e.toString());
    }
  }

  Future<void> removeWidget(WidgetType type) async {
    final newInstalled = {...state.installedWidgets}..remove(type);
    state = state.copyWith(installedWidgets: newInstalled);
    Log.i('WidgetNotifier: 移除小部件 ${type.title}');
  }

  Future<PinWidgetResult> requestPinWidget(WidgetType type) async {
    // [PlatformCapabilities] 统一能力查询: homeWidget
    if (pu.isOhos || !PlatformCapabilities.supports(CapabilityKey.homeWidget)) {
      Log.w('WidgetNotifier: 鸿蒙端不支持快捷添加');
      return PinWidgetResult.unsupported;
    }

    try {
      await HomeWidget.requestPinWidget(
        qualifiedAndroidName: type.qualifiedAndroidName,
        androidName: type.androidProviderName,
      );
      Log.i('WidgetNotifier: 请求固定小部件 ${type.title}');
      return PinWidgetResult.success;
    } on PlatformException catch (e) {
      Log.e('WidgetNotifier: 请求固定小部件 PlatformException', e);
      if (e.code == 'not_supported' || e.code == 'ACTION_APPWIDGET_BIND') {
        return PinWidgetResult.unsupported;
      }
      return PinWidgetResult.failed;
    } catch (e) {
      Log.e('WidgetNotifier: 请求固定小部件失败', e);
      return PinWidgetResult.failed;
    }
  }

  Future<void> pushDataToWidget(WidgetType type) async {
    try {
      final service = ref.read(homeWidgetServiceProvider);
      await service.init();
      await service.updateWidget(type);
      Log.i('WidgetNotifier: 推送数据到小部件 ${type.title}');
    } catch (e) {
      Log.e('WidgetNotifier: 推送数据失败', e);
    }
  }

  Future<void> pushThemeToAllWidgets() async {
    try {
      final service = ref.read(homeWidgetServiceProvider);
      await service.init();
      final isDark =
          PlatformDispatcher.instance.platformBrightness == Brightness.dark;
      await service.pushThemeMode(isDark);
      for (final type in WidgetType.values) {
        await service.updateWidget(type);
      }
      Log.i('WidgetNotifier: 已推送主题到所有小部件');
    } catch (e) {
      Log.e('WidgetNotifier: 推送主题失败', e);
    }
  }
}

final widgetProvider = NotifierProvider<WidgetNotifier, WidgetState>(
  WidgetNotifier.new,
);