// Author: fruit.com.cn

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../../core/config/app_config.dart';
import '../../core/config/locale_controller.dart';
import '../../core/config/server_endpoint.dart';
import '../../core/data/models/drama.dart';
import '../../core/data/models/watch_progress.dart';
import '../../core/data/repositories/watch_history_repository.dart';
import '../../core/theme/app_colors.dart';
import '../../l10n/app_localizations.dart';

enum MyPageAction { home, discover, resume }

class MineLogic extends ChangeNotifier {
  MineLogic({
    required this.history,
    required this.drama,
    required int initialSection,
  }) : section = initialSection {
    refreshPosition();
  }

  final WatchHistoryRepository history;
  Drama drama;
  late Future<Duration?> position;
  List<WatchProgress> recent = const [];
  bool recentLoading = false;
  String? recentError;

  /// 续看位置读取失败：与"没有记录"区分开，失败要能重试（不能假装成从 0 开始）
  bool positionFailed = false;
  int section;
  int filter = 0;
  bool _disposed = false;

  void notify() {
    if (!_disposed) notifyListeners();
  }

  void refreshPosition() {
    position = history
        .resumePointFor(drama.id)
        .then((point) {
          positionFailed = false;
          return point?.position;
        })
        .catchError((Object _) {
          positionFailed = true;
          notify();
          return null;
        });
    refreshRecent();
  }

  /// 最近观看：服务端只给 dramaId/位置，剧名封面用已加载的目录卡片按 id 映射。
  Future<void> refreshRecent() async {
    recentLoading = true;
    recentError = null;
    notify();
    try {
      recent = await history.recent(limit: 20);
    } catch (_) {
      recentError = 'progressError';
    } finally {
      recentLoading = false;
      notify();
    }
  }

  void selectSection(int index) {
    section = index;
    notify();
  }

  void selectFilter(int index) {
    filter = index;
    notify();
  }

  void syncPage({
    required bool active,
    required bool wasActive,
    required Drama nextDrama,
    required bool dramaChanged,
    required int sectionRequest,
    required int previousSectionRequest,
    required int initialSection,
  }) {
    if (active && (!wasActive || dramaChanged)) {
      drama = nextDrama;
      refreshPosition();
      notify();
    }
    if (sectionRequest != previousSectionRequest) {
      section = initialSection;
      notify();
    }
  }

  void act(
    BuildContext context,
    MyPageAction action, {
    required bool embedded,
    ValueChanged<MyPageAction>? onAction,
  }) {
    if (embedded) {
      onAction?.call(action);
    } else {
      Navigator.pop(context, action);
    }
  }

  Future<void> showLanguage(
    BuildContext context, {
    bool showServerSetting = kDebugMode,
  }) async {
    final l10n = AppLocalizations.of(context)!;
    await showModalBottomSheet<void>(
      context: context,
      backgroundColor: const Color(0xFF1C1D22),
      showDragHandle: true,
      isScrollControlled: true,
      builder: (sheetContext) => SafeArea(
        child: ConstrainedBox(
          constraints: BoxConstraints(
            maxHeight: MediaQuery.sizeOf(sheetContext).height * 0.85,
          ),
          child: SingleChildScrollView(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                ListTile(title: Text(l10n.language)),
                for (final (code, label) in [
                  ('en', l10n.english),
                  ('zh', l10n.simplifiedChinese),
                  ('id', l10n.bahasaIndonesia),
                ])
                  ListTile(
                    title: Text(label),
                    onTap: () {
                      context.read<LocaleController>().select(code);
                      Navigator.pop(sheetContext);
                    },
                  ),
                if (showServerSetting) ...[
                  const Divider(height: 1),
                  ListTile(
                    key: const Key('server-endpoint-setting'),
                    leading: const Icon(Icons.dns_outlined),
                    title: Text(l10n.serverAddress),
                    subtitle: Text(AppConfig.apiBaseUrl),
                    trailing: const Icon(Icons.edit_outlined),
                    onTap: () => _editServerEndpoint(context, l10n),
                  ),
                ],
                const SizedBox(height: 8),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Future<void> _editServerEndpoint(
    BuildContext context,
    AppLocalizations l10n,
  ) async {
    final changed = await showDialog<bool>(
      context: context,
      builder: (_) => _ServerEndpointDialog(l10n: l10n),
    );
    if (changed == true && context.mounted) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(SnackBar(content: Text(l10n.restartToApply)));
    }
  }

  @override
  void dispose() {
    _disposed = true;
    super.dispose();
  }
}

class _ServerEndpointDialog extends StatefulWidget {
  const _ServerEndpointDialog({required this.l10n});

  final AppLocalizations l10n;

  @override
  State<_ServerEndpointDialog> createState() => _ServerEndpointDialogState();
}

class _ServerEndpointDialogState extends State<_ServerEndpointDialog> {
  late final TextEditingController _controller = TextEditingController(
    text: AppConfig.apiBaseUrl,
  );
  String? _error;
  bool _saving = false;

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  Future<void> _save() async {
    final normalized = ServerEndpoint.normalize(_controller.text);
    if (normalized == null) {
      setState(() => _error = widget.l10n.invalidServerAddress);
      return;
    }
    setState(() {
      _saving = true;
      _error = null;
    });
    final saved = await ServerEndpoint.save(normalized);
    if (!mounted) return;
    if (!saved) {
      setState(() {
        _saving = false;
        _error = widget.l10n.invalidServerAddress;
      });
      return;
    }
    Navigator.pop(context, true);
  }

  Future<void> _restoreDefault() async {
    setState(() => _saving = true);
    await ServerEndpoint.clear();
    if (mounted) Navigator.pop(context, true);
  }

  @override
  Widget build(BuildContext context) {
    final l10n = widget.l10n;
    return AlertDialog(
      title: Text(l10n.serverAddress),
      content: SingleChildScrollView(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            TextField(
              key: const Key('server-endpoint-input'),
              controller: _controller,
              enabled: !_saving,
              keyboardType: TextInputType.url,
              autocorrect: false,
              decoration: InputDecoration(
                hintText: l10n.serverAddressHint,
                errorText: _error,
                errorMaxLines: 2,
              ),
            ),
            const SizedBox(height: 10),
            Text(
              l10n.restartToApply,
              key: const Key('server-endpoint-restart-hint'),
              style: const TextStyle(color: AppColors.muted, fontSize: 12),
            ),
            const SizedBox(height: 4),
            TextButton(
              key: const Key('server-endpoint-restore'),
              onPressed: _saving ? null : _restoreDefault,
              child: Text(l10n.restoreDefault),
            ),
          ],
        ),
      ),
      actions: [
        TextButton(
          onPressed: _saving ? null : () => Navigator.pop(context, false),
          child: Text(l10n.cancel),
        ),
        FilledButton(
          key: const Key('server-endpoint-save'),
          onPressed: _saving ? null : _save,
          child: Text(l10n.saveAddress),
        ),
      ],
    );
  }
}