import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import '../config/theme.dart';
import '../models/models.dart';
import '../services/api_service.dart';
import '../services/device_service.dart';

class AppDetailScreen extends HookWidget {
  final ApiService api;
  final AppInfo app;
  final String? installedVersion;

  const AppDetailScreen({
    super.key,
    required this.api,
    required this.app,
    this.installedVersion,
  });

  @override
  Widget build(BuildContext context) {
    final deviceService = useMemoized(() => DeviceService());
    final installedVersionState = useState(installedVersion);
    final downloadStates = useState<Map<String, DownloadState>>({});

    Future<void> refreshInstalledVersion() async {
      final version = await deviceService.getInstalledVersion(app.packageName);
      installedVersionState.value = version;
    }

    useEffect(() {
      refreshInstalledVersion();
      return null;
    }, const []);

    Future<void> downloadVersion(String stateKey, VersionInfo version) async {
      downloadStates.value = {
        ...downloadStates.value,
        stateKey: DownloadState(isDownloading: true, progress: 0),
      };

      try {
        final response = await api.downloadVersion(version.id);
        final filePath = await deviceService.downloadFile(
          stream: response.stream,
          contentLength: response.contentLength,
          fileName: '${app.packageName}_${version.version}.apk',
          onProgress: (received, total) {
            if (total != null && total > 0) {
              downloadStates.value = {
                ...downloadStates.value,
                stateKey: DownloadState(
                  isDownloading: true,
                  progress: received / total,
                ),
              };
            }
          },
        );

        downloadStates.value = {
          ...downloadStates.value,
          stateKey: DownloadState(
            isDownloading: false,
            downloadedPath: filePath,
          ),
        };
      } catch (e) {
        downloadStates.value = {
          ...downloadStates.value,
          stateKey: DownloadState(),
        };
        if (context.mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('Download failed')),
          );
        }
      }
    }

    Future<void> installApk(String stateKey) async {
      final path = downloadStates.value[stateKey]?.downloadedPath;
      if (path == null) return;

      final success = await deviceService.installApk(path);
      if (!context.mounted) return;

      if (success) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Installation started')),
        );
        Future.delayed(const Duration(seconds: 3), refreshInstalledVersion);
      } else {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Installation failed')),
        );
      }
    }

    Future<void> openApp() async {
      final success = await deviceService.openApp(app.packageName);
      if (!context.mounted) return;

      if (!success) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Could not open app')),
        );
      }
    }

    return Scaffold(
      appBar: AppBar(
        title: Text(app.title),
        actions: [
          IconButton(
            icon: const Icon(Icons.refresh_rounded, size: 22),
            onPressed: refreshInstalledVersion,
          ),
        ],
      ),
      body: ListView(
        padding: const EdgeInsets.all(16),
        children: [
          _buildHeader(installedVersionState.value),
          const SizedBox(height: 24),
          _buildTrack(
            'Release', app.release, 'release',
            installedVersion: installedVersionState.value,
            downloadStates: downloadStates,
            onDownload: downloadVersion,
            onInstall: installApk,
            onOpen: openApp,
          ),
          const SizedBox(height: 20),
          _buildTrack(
            'Debug', app.debug, 'debug',
            installedVersion: installedVersionState.value,
            downloadStates: downloadStates,
            onDownload: downloadVersion,
            onInstall: installApk,
            onOpen: openApp,
          ),
          const SizedBox(height: 20),
          _buildTrack(
            'Profile', app.profile, 'profile',
            installedVersion: installedVersionState.value,
            downloadStates: downloadStates,
            onDownload: downloadVersion,
            onInstall: installApk,
            onOpen: openApp,
          ),
        ],
      ),
    );
  }

  Widget _buildHeader(String? installedVersion) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: AppColors.surface,
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: AppColors.border),
      ),
      child: Row(
        children: [
          ClipRRect(
            borderRadius: BorderRadius.circular(12),
            child: Image.network(
              api.iconUrl(app.icon),
              width: 56,
              height: 56,
              fit: BoxFit.cover,
              errorBuilder: (_, _, _) => Container(
                width: 56,
                height: 56,
                decoration: BoxDecoration(
                  color: AppColors.accentDim,
                  borderRadius: BorderRadius.circular(12),
                ),
                child: const Icon(Icons.android,
                    color: AppColors.accent, size: 28),
              ),
            ),
          ),
          const SizedBox(width: 16),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  app.title,
                  style: const TextStyle(
                    fontWeight: FontWeight.w600,
                    fontSize: 17,
                    color: AppColors.text,
                  ),
                ),
                const SizedBox(height: 2),
                Text(
                  app.packageName,
                  style: const TextStyle(
                    color: AppColors.muted,
                    fontSize: 12,
                  ),
                ),
                if (installedVersion != null) ...[
                  const SizedBox(height: 6),
                  Row(
                    children: [
                      const Icon(Icons.check_circle,
                          size: 14, color: AppColors.success),
                      const SizedBox(width: 4),
                      Text(
                        'Installed v$installedVersion',
                        style: const TextStyle(
                          color: AppColors.success,
                          fontSize: 12,
                          fontWeight: FontWeight.w500,
                        ),
                      ),
                    ],
                  ),
                ],
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildTrack(
    String label,
    Track track,
    String trackName, {
    required String? installedVersion,
    required ValueNotifier<Map<String, DownloadState>> downloadStates,
    required Future<void> Function(String, VersionInfo) onDownload,
    required Future<void> Function(String) onInstall,
    required Future<void> Function() onOpen,
  }) {
    return Container(
      decoration: BoxDecoration(
        color: AppColors.surface,
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: AppColors.border),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Padding(
            padding: const EdgeInsets.fromLTRB(16, 14, 16, 0),
            child: Row(
              children: [
                Icon(_trackIcon(trackName), size: 16, color: _trackColor(trackName)),
                const SizedBox(width: 8),
                Text(
                  label,
                  style: TextStyle(
                    fontWeight: FontWeight.w600,
                    fontSize: 14,
                    color: _trackColor(trackName),
                  ),
                ),
              ],
            ),
          ),
          if (track.current != null)
            _buildVersionRow(
              track.current!, trackName, isCurrent: true,
              installedVersion: installedVersion,
              downloadStates: downloadStates,
              onDownload: onDownload,
              onInstall: onInstall,
              onOpen: onOpen,
            )
          else
            _buildEmptyRow('No version'),
          if (track.pending != null) ...[
            const Divider(height: 1, indent: 16, endIndent: 16),
            _buildVersionRow(
              track.pending!, trackName, isCurrent: false,
              installedVersion: installedVersion,
              downloadStates: downloadStates,
              onDownload: onDownload,
              onInstall: onInstall,
              onOpen: onOpen,
            ),
          ],
          if (track.current == null && track.pending == null)
            const Padding(
              padding: EdgeInsets.all(16),
              child: Text(
                'No versions yet',
                style: TextStyle(color: AppColors.muted, fontSize: 13),
              ),
            ),
        ],
      ),
    );
  }

  Widget _buildVersionRow(
    VersionInfo version,
    String trackName, {
    required bool isCurrent,
    required String? installedVersion,
    required ValueNotifier<Map<String, DownloadState>> downloadStates,
    required Future<void> Function(String, VersionInfo) onDownload,
    required Future<void> Function(String) onInstall,
    required Future<void> Function() onOpen,
  }) {
    final stateKey = '${trackName}_${version.id}';
    final state = downloadStates.value[stateKey];
    final isDownloading = state?.isDownloading ?? false;
    final downloadProgress = state?.progress;
    final isNewer = installedVersion != null && _isNewer(version.version, installedVersion);
    final isInstalledSame = installedVersion == version.version && isCurrent;

    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Container(
                padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
                decoration: BoxDecoration(
                  color: isCurrent
                      ? AppColors.accent.withValues(alpha: 0.12)
                      : AppColors.muted.withValues(alpha: 0.12),
                  borderRadius: BorderRadius.circular(4),
                ),
                child: Text(
                  isCurrent ? 'CURRENT' : 'PENDING',
                  style: TextStyle(
                    fontSize: 9,
                    fontWeight: FontWeight.w700,
                    color: isCurrent ? AppColors.accent : AppColors.muted,
                    letterSpacing: 0.5,
                  ),
                ),
              ),
              const SizedBox(width: 8),
              Expanded(
                child: Text(
                  'v${version.version}',
                  style: const TextStyle(
                    fontWeight: FontWeight.w600,
                    fontSize: 15,
                    color: AppColors.text,
                  ),
                ),
              ),
              if (version.hasFile && isCurrent && !isInstalledSame)
                _buildDownloadButton(stateKey, version, downloadStates, onDownload, onInstall, onOpen),
            ],
          ),
          if (version.name.isNotEmpty) ...[
            const SizedBox(height: 4),
            Text(
              version.name,
              style: const TextStyle(color: AppColors.muted, fontSize: 12),
            ),
          ],
          const SizedBox(height: 4),
          Row(
            children: [
              Text(
                _formatDate(version.created),
                style: const TextStyle(color: AppColors.muted, fontSize: 11),
              ),
              if (version.public) ...[
                const SizedBox(width: 8),
                const Icon(Icons.public, size: 12, color: AppColors.muted),
              ],
              if (isNewer) ...[
                const SizedBox(width: 8),
                Container(
                  padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 1),
                  decoration: BoxDecoration(
                    color: AppColors.accent.withValues(alpha: 0.12),
                    borderRadius: BorderRadius.circular(4),
                  ),
                  child: const Text(
                    'UPDATE',
                    style: TextStyle(
                      fontSize: 9,
                      fontWeight: FontWeight.w700,
                      color: AppColors.accent,
                      letterSpacing: 0.5,
                    ),
                  ),
                ),
              ],
              if (isInstalledSame) ...[
                const SizedBox(width: 8),
                const Icon(Icons.check_circle, size: 13, color: AppColors.success),
              ],
            ],
          ),
          if (isDownloading && downloadProgress != null) ...[
            const SizedBox(height: 8),
            LinearProgressIndicator(
              value: downloadProgress,
              backgroundColor: AppColors.elevated,
              color: AppColors.accent,
              minHeight: 3,
              borderRadius: BorderRadius.circular(2),
            ),
            const SizedBox(height: 4),
            Text(
              '${(downloadProgress * 100).toInt()}%',
              style: const TextStyle(color: AppColors.muted, fontSize: 11),
            ),
          ],
        ],
      ),
    );
  }

  Widget _buildDownloadButton(
    String stateKey,
    VersionInfo version,
    ValueNotifier<Map<String, DownloadState>> downloadStates,
    Future<void> Function(String, VersionInfo) onDownload,
    Future<void> Function(String) onInstall,
    Future<void> Function() onOpen,
  ) {
    final state = downloadStates.value[stateKey];
    if (state?.downloadedPath != null) {
      return Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          TextButton.icon(
            onPressed: onOpen,
            icon: const Icon(Icons.open_in_new, size: 16),
            label: const Text('Open'),
            style: TextButton.styleFrom(
              foregroundColor: AppColors.success,
              padding: const EdgeInsets.symmetric(horizontal: 10),
              minimumSize: Size.zero,
              tapTargetSize: MaterialTapTargetSize.shrinkWrap,
            ),
          ),
          const SizedBox(width: 4),
          TextButton.icon(
            onPressed: () => onInstall(stateKey),
            icon: const Icon(Icons.install_mobile, size: 16),
            label: const Text('Install'),
            style: TextButton.styleFrom(
              foregroundColor: AppColors.accent,
              padding: const EdgeInsets.symmetric(horizontal: 10),
              minimumSize: Size.zero,
              tapTargetSize: MaterialTapTargetSize.shrinkWrap,
            ),
          ),
        ],
      );
    }

    return IconButton(
      onPressed: (state?.isDownloading ?? false)
          ? null
          : () => onDownload(stateKey, version),
      icon: (state?.isDownloading ?? false)
          ? const SizedBox(
              width: 18,
              height: 18,
              child: CircularProgressIndicator(
                strokeWidth: 2,
                color: AppColors.accent,
              ),
            )
          : const Icon(Icons.download_rounded, size: 20),
      color: AppColors.accent,
      tooltip: 'Download',
      padding: const EdgeInsets.all(8),
      constraints: const BoxConstraints(),
    );
  }

  Widget _buildEmptyRow(String text) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      child: Text(
        text,
        style: const TextStyle(color: AppColors.muted, fontSize: 13),
      ),
    );
  }

  bool _isNewer(String a, String b) {
    final aParts = a.split('.').map((s) => int.tryParse(s.split('-').first) ?? 0).toList();
    final bParts = b.split('.').map((s) => int.tryParse(s.split('-').first) ?? 0).toList();
    for (var i = 0; i < (aParts.length > bParts.length ? aParts.length : bParts.length); i++) {
      final av = i < aParts.length ? aParts[i] : 0;
      final bv = i < bParts.length ? bParts[i] : 0;
      if (av > bv) return true;
      if (av < bv) return false;
    }
    return false;
  }

  IconData _trackIcon(String track) {
    switch (track) {
      case 'release':
        return Icons.rocket_launch;
      case 'debug':
        return Icons.bug_report;
      case 'profile':
        return Icons.speed;
      default:
        return Icons.code;
    }
  }

  Color _trackColor(String track) {
    switch (track) {
      case 'release':
        return AppColors.success;
      case 'debug':
        return AppColors.danger;
      case 'profile':
        return AppColors.accent;
      default:
        return AppColors.muted;
    }
  }

  String _formatDate(DateTime date) {
    return '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
  }
}

class DownloadState {
  final bool isDownloading;
  final double? progress;
  final String? downloadedPath;

  DownloadState({
    this.isDownloading = false,
    this.progress,
    this.downloadedPath,
  });
}