import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:moonwell_launcher/app/design_system/mw_launcher_components.dart';
import 'package:moonwell_launcher/app/design_system/mw_shells.dart';
import 'package:moonwell_launcher/app/home_screen/bloc/home_screen_bloc.dart';
import 'package:moonwell_launcher/app/home_screen/bloc/home_screen_model.dart';
import 'package:moonwell_launcher/app/mw_app.dart';
import 'package:moonwell_launcher/features/launcher/domain/entities/client_sync_status.dart';
import 'package:window_manager/window_manager.dart';

class HomeScreenContent extends StatelessWidget {
  const HomeScreenContent({super.key});

  @override
  Widget build(BuildContext context) {
    final model = context.watch<HomeScreenBloc>().state.model;
    return MwLauncherShell(
      news: _buildNews(model),
      syncActions: _buildSyncActions(context, model),
      statusBar: _buildStatusBar(model),
      account: MwAccountAffordance(
        onSettings: () => _showSettings(context, model),
        onLogout: () =>
            context.read<HomeScreenBloc>().add(HomeScreenLogoutRequested()),
      ),
      onDrag: windowManager.startDragging,
      onDoubleTap: () => unawaited(_toggleMaximized()),
      onMinimize: windowManager.minimize,
      onMaximizeRestore: () => unawaited(_toggleMaximized()),
      onClose: () => unawaited(windowManager.destroy()),
    );
  }

  Widget _buildNews(HomeScreenModel model) {
    final state = model.isLoadingNews
        ? MwNewsListState.loading
        : model.newsItems.isNotEmpty
        ? MwNewsListState.populated
        : model.newsErrorMessage != null
        ? MwNewsListState.failure
        : MwNewsListState.empty;
    return MwNewsList(
      state: state,
      error: model.newsErrorMessage,
      items: [
        for (final item in model.newsItems)
          MwNewsItemData(
            title: item.title,
            body: item.body,
            createdAt: item.createdAt,
            imageUrl: item.imageUrl,
          ),
      ],
    );
  }

  Widget _buildSyncActions(BuildContext context, HomeScreenModel model) {
    final presentation = _syncPresentation(model);
    final progress = model.progress.total > 0
        ? (model.progress.downloaded / model.progress.total).clamp(0.0, 1.0)
        : null;
    return MwSyncActionArea(
      state: presentation,
      status: model.statusText,
      currentPath: model.currentPath,
      error: model.errorMessage,
      progress: progress,
      onPrimary: () {
        final bloc = context.read<HomeScreenBloc>();
        if (model.phase == HomeScreenPhase.readyToPlay && model.canPlay) {
          bloc.add(HomeScreenPlayRequested());
        } else {
          bloc.add(HomeScreenSyncRequested());
        }
      },
      onPause: model.isSyncing
          ? () => context.read<HomeScreenBloc>().add(HomeScreenPauseRequested())
          : null,
    );
  }

  MwSyncPresentation _syncPresentation(HomeScreenModel model) {
    if (model.phase == HomeScreenPhase.paused) {
      return MwSyncPresentation.paused;
    }
    if (model.phase == HomeScreenPhase.failure) {
      return MwSyncPresentation.failure;
    }
    if (model.phase == HomeScreenPhase.readyToPlay) {
      return model.statusText.startsWith('Игра запущена')
          ? MwSyncPresentation.launched
          : MwSyncPresentation.ready;
    }
    if (model.phase != HomeScreenPhase.syncing) {
      return MwSyncPresentation.install;
    }
    return switch (model.syncStage) {
      ClientSyncStage.downloadingFiles => MwSyncPresentation.downloading,
      ClientSyncStage.verifyingInstallation => MwSyncPresentation.verifying,
      ClientSyncStage.completed => MwSyncPresentation.ready,
      _ => MwSyncPresentation.scanning,
    };
  }

  Widget _buildStatusBar(HomeScreenModel model) {
    return MwLauncherStatusBar(
      status: model.outputPath?.toFilePath() ?? 'Папка установки не выбрана',
      fileCount: model.totalFiles > 0
          ? '${model.processedFiles}/${model.totalFiles}'
          : null,
      speed: model.progress.speed > 0
          ? _formatSpeed(model.progress.speed)
          : null,
      eta: model.progress.eta > Duration.zero
          ? _formatDuration(model.progress.eta)
          : null,
      buildHash: _shortHash(model.localBuildHash ?? model.remoteBuildHash),
    );
  }

  Future<void> _showSettings(
    BuildContext context,
    HomeScreenModel model,
  ) async {
    final bloc = context.read<HomeScreenBloc>();
    final themeController = LauncherThemeScope.of(context);
    await showDialog<void>(
      context: context,
      builder: (dialogContext) => Dialog(
        child: ConstrainedBox(
          constraints: const BoxConstraints(maxWidth: 460, maxHeight: 620),
          child: AnimatedBuilder(
            animation: themeController,
            builder: (context, _) => SingleChildScrollView(
              child: MwSettingsPanel(
                installationPath: model.outputPath?.toFilePath(),
                themeVariant: themeController.variant,
                syncActive: model.isSyncing,
                onChooseDirectory: () {
                  Navigator.of(dialogContext).pop();
                  bloc.add(HomeScreenOutputDirRequested());
                },
                onThemeChanged: (variant) {
                  unawaited(themeController.setVariant(variant));
                },
                onVerify: () {
                  Navigator.of(dialogContext).pop();
                  bloc.add(HomeScreenSyncRequested());
                },
                onLogout: () {
                  Navigator.of(dialogContext).pop();
                  bloc.add(HomeScreenLogoutRequested());
                },
              ),
            ),
          ),
        ),
      ),
    );
  }

  Future<void> _toggleMaximized() async {
    if (await windowManager.isMaximized()) {
      await windowManager.unmaximize();
    } else {
      await windowManager.maximize();
    }
  }

  String _formatSpeed(int bytesPerSecond) {
    const megabyte = 1024 * 1024;
    if (bytesPerSecond >= megabyte) {
      return '${(bytesPerSecond / megabyte).toStringAsFixed(1)} MB/s';
    }
    return '${(bytesPerSecond / 1024).toStringAsFixed(0)} KB/s';
  }

  String _formatDuration(Duration duration) {
    final hours = duration.inHours.toString().padLeft(2, '0');
    final minutes = (duration.inMinutes % 60).toString().padLeft(2, '0');
    final seconds = (duration.inSeconds % 60).toString().padLeft(2, '0');
    return '$hours:$minutes:$seconds';
  }

  String? _shortHash(String? hash) {
    if (hash == null || hash.isEmpty) return null;
    return hash.length <= 8 ? hash : hash.substring(0, 8);
  }
}