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

import '../../../core/player/feed_player_pool.dart';
import '../../../models/video_item.dart';
import '../../../providers/auth_provider.dart';
import 'feed_overlays.dart';
import 'interaction_bar.dart';
import 'video_info_section.dart';
import 'video_player_view.dart';

/// Feed 单页：播放器 + 手势层 + 互动栏 + 信息区 + 双击爱心动画
/// 手势（《01-开发文档》5.3）：单击暂停/继续，双击点赞
class FeedVideoPage extends ConsumerStatefulWidget {
  const FeedVideoPage({
    super.key,
    required this.item,
    required this.slotIndex,
    required this.pool,
    required this.isCurrent,
    required this.onLike,
    this.onFavorite,
    this.onComment,
    this.onShare,
  });

  final VideoItem item;
  final int slotIndex;
  final FeedPlayerPool pool;
  final bool isCurrent;

  /// 点赞回调（由上层接 feedProvider.toggleLike，内部判登录态）
  final void Function(int videoId) onLike;

  /// 收藏回调（由上层接 feedProvider.toggleFavorite）
  final void Function(int videoId)? onFavorite;

  /// 评论入口（打开评论弹层）
  final void Function(VideoItem item)? onComment;

  /// 分享入口（系统分享面板）
  final void Function(VideoItem item)? onShare;

  @override
  ConsumerState<FeedVideoPage> createState() => _FeedVideoPageState();
}

class _FeedVideoPageState extends ConsumerState<FeedVideoPage> {
  int _likeBurstTrigger = 0;

  void _onDoubleTap() {
    // 游客双击：与点赞按钮一致守卫登录（《01-开发文档》2.1.1 游客不可点赞）
    if (!ref.read(authProvider).isLoggedIn) {
      context.go('/login');
      return;
    }
    setState(() => _likeBurstTrigger++);
    // 双击：未点赞等同点赞；已点赞只播动画不改状态
    if (!widget.item.isLiked) {
      widget.onLike(widget.item.videoId);
    }
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: widget.pool.toggleCurrent,
      onDoubleTap: _onDoubleTap,
      child: Container(
        color: Colors.black,
        child: Stack(
          fit: StackFit.expand,
          children: [
            // 底部渐变（提升文字可读性）
            const Positioned(
              left: 0,
              right: 0,
              bottom: 0,
              height: 160,
              child: IgnorePointer(
                child: DecoratedBox(
                  decoration: BoxDecoration(
                    gradient: LinearGradient(
                      begin: Alignment.topCenter,
                      end: Alignment.bottomCenter,
                      colors: [Colors.transparent, Colors.black54],
                    ),
                  ),
                ),
              ),
            ),

            // 播放器
            VideoPlayerView(
              controller: widget.pool.controllerAt(widget.slotIndex),
              coverUrl: widget.item.coverUrl,
              playing: widget.isCurrent && widget.pool.isCurrentPlaying,
            ),

            // 双击爱心动画
            IgnorePointer(child: LikeBurst(trigger: _likeBurstTrigger)),

            // 右侧互动栏
            Positioned(
              right: 8,
              bottom: 96,
              child: InteractionBar(
                item: widget.item,
                onLike: widget.onLike,
                onFavorite: widget.onFavorite,
                onComment: widget.onComment,
                onShare: widget.onShare,
              ),
            ),

            // 左下信息区
            Positioned(
              left: 12,
              right: 88,
              bottom: 24,
              child: VideoInfoSection(item: widget.item),
            ),
          ],
        ),
      ),
    );
  }
}