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

import '../../core/network/api_exception.dart';
import '../../core/theme/app_theme.dart';
import '../../models/video_item.dart';
import '../../providers/profile_provider.dart';
import '../../providers/upload_provider.dart';
import '../../services/video_service.dart';
import '../feed/widgets/feed_overlays.dart';

/// 编辑作品（《03-接口文档》5.12 / 5.13，仅作者）：
/// 可改标题/简介/分类/标签；删除为服务端软删除，二次确认后立即下架。
class EditVideoScreen extends ConsumerStatefulWidget {
  const EditVideoScreen({super.key, required this.video});

  final VideoItem video;

  @override
  ConsumerState<EditVideoScreen> createState() => _EditVideoScreenState();
}

class _EditVideoScreenState extends ConsumerState<EditVideoScreen> {
  late final TextEditingController _titleCtrl;
  late final TextEditingController _descCtrl;
  late final TextEditingController _tagsCtrl;
  late int _categoryId;
  bool _submitting = false;

  @override
  void initState() {
    super.initState();
    final v = widget.video;
    _titleCtrl = TextEditingController(text: v.title);
    _descCtrl = TextEditingController(text: v.description);
    _tagsCtrl = TextEditingController(text: v.tags.join(' '));
    _categoryId = v.categoryId;
  }

  @override
  void dispose() {
    _titleCtrl.dispose();
    _descCtrl.dispose();
    _tagsCtrl.dispose();
    super.dispose();
  }

  /// 空格/逗号/顿号分隔，去重，最多 5 个
  List<String> _parseTags() => _tagsCtrl.text
      .split(RegExp(r'[\s,，、]+'))
      .map((e) => e.trim())
      .where((e) => e.isNotEmpty)
      .toSet()
      .take(5)
      .toList();

  void _toast(String message) {
    if (mounted) showTopToast(context, message);
  }

  Future<void> _save() async {
    final title = _titleCtrl.text.trim();
    if (title.isEmpty) {
      _toast('请填写标题');
      return;
    }
    setState(() => _submitting = true);
    try {
      await VideoService.updateVideo(
        widget.video.videoId,
        title: title,
        description: _descCtrl.text.trim(),
        categoryId: _categoryId,
        tags: _parseTags(),
      );
      // 刷新我的作品列表，返回后展示最新信息
      ref.invalidate(myVideosProvider);
      _toast('已保存');
      if (mounted) Navigator.of(context).maybePop();
    } on ApiException catch (e) {
      _toast(e.message);
    } catch (_) {
      _toast('网络异常，请稍后重试');
    } finally {
      if (mounted) setState(() => _submitting = false);
    }
  }

  Future<void> _confirmDelete() async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        backgroundColor: AppColors.surface,
        title: const Text('删除作品'),
        content: const Text('删除后作品立即下架且不可恢复，确定删除？'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx, false),
            child: const Text('取消',
                style: TextStyle(color: AppColors.textSecondary)),
          ),
          TextButton(
            onPressed: () => Navigator.pop(ctx, true),
            child:
                const Text('删除', style: TextStyle(color: AppColors.primary)),
          ),
        ],
      ),
    );
    if (confirmed != true) return;

    setState(() => _submitting = true);
    try {
      await VideoService.deleteVideo(widget.video.videoId);
      ref.invalidate(myVideosProvider);
      _toast('已删除');
      if (mounted) Navigator.of(context).maybePop();
    } on ApiException catch (e) {
      _toast(e.message);
    } catch (_) {
      _toast('网络异常，请稍后重试');
    } finally {
      if (mounted) setState(() => _submitting = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final categories = ref.watch(uploadCategoriesProvider);
    return Scaffold(
      appBar: AppBar(title: const Text('编辑作品')),
      body: ListView(
        padding: const EdgeInsets.all(16),
        children: [
          TextField(
            controller: _titleCtrl,
            enabled: !_submitting,
            maxLength: 100,
            decoration: const InputDecoration(labelText: '标题'),
          ),
          const SizedBox(height: 8),
          TextField(
            controller: _descCtrl,
            enabled: !_submitting,
            maxLength: 500,
            maxLines: 3,
            decoration: const InputDecoration(labelText: '简介'),
          ),
          const SizedBox(height: 8),
          const Text('分类', style: TextStyle(color: AppColors.textSecondary)),
          const SizedBox(height: 8),
          categories.when(
            loading: () => const LinearProgressIndicator(),
            error: (_, __) => const Text('分类加载失败',
                style: TextStyle(color: AppColors.textWeak, fontSize: 12)),
            data: (list) => Wrap(
              spacing: 8,
              runSpacing: 8,
              children: [
                for (final c in list)
                  ChoiceChip(
                    label: Text(c.name),
                    selected: _categoryId == c.categoryId,
                    onSelected: _submitting
                        ? null
                        : (_) => setState(() => _categoryId = c.categoryId),
                  ),
              ],
            ),
          ),
          const SizedBox(height: 16),
          TextField(
            controller: _tagsCtrl,
            enabled: !_submitting,
            decoration: const InputDecoration(
              labelText: '标签',
              hintText: '空格分隔，最多 5 个',
            ),
          ),
          const SizedBox(height: 24),
          ElevatedButton(
            onPressed: _submitting ? null : _save,
            style: ElevatedButton.styleFrom(minimumSize: const Size(0, 48)),
            child: const Text('保存'),
          ),
          const SizedBox(height: 8),
          OutlinedButton(
            onPressed: _submitting ? null : _confirmDelete,
            style: OutlinedButton.styleFrom(
              minimumSize: const Size(0, 48),
              side: const BorderSide(color: AppColors.primary),
            ),
            child: const Text('删除作品',
                style: TextStyle(color: AppColors.primary)),
          ),
        ],
      ),
    );
  }
}