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

import '../../../core/theme/app_theme.dart';

/// 顶部轻提示（扣积分/操作失败等），自动消失，不依赖第三方 Toast 库
void showTopToast(BuildContext context, String message) {
  final overlay = Overlay.of(context);
  final entry = OverlayEntry(
    builder: (_) => Positioned(
      top: MediaQuery.of(context).padding.top + 16,
      left: 48,
      right: 48,
      child: Material(
        color: Colors.transparent,
        child: Center(
          child: Container(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
            decoration: BoxDecoration(
              color: Colors.black.withValues(alpha: 0.75),
              borderRadius: BorderRadius.circular(20),
            ),
            child: Text(
              message,
              style: const TextStyle(color: Colors.white, fontSize: 14),
            ),
          ),
        ),
      ),
    ),
  );
  overlay.insert(entry);
  Future.delayed(const Duration(seconds: 2), entry.remove);
}

/// 游客今日免费次数已用完：登录引导（2002）
void showGuestLimitDialog(BuildContext context) {
  showDialog<void>(
    context: context,
    barrierDismissible: false,
    builder: (ctx) => AlertDialog(
      backgroundColor: AppColors.surface,
      title: const Text('今日免费次数已用完'),
      content: const Text('注册解锁更多视频，今日已看 10/10'),
      actions: [
        TextButton(
          onPressed: () => Navigator.of(ctx).pop(),
          child: const Text('再逛逛', style: TextStyle(color: AppColors.textSecondary)),
        ),
        ElevatedButton(
          onPressed: () {
            Navigator.of(ctx).pop();
            context.go('/login');
          },
          child: const Text('去登录/注册'),
        ),
      ],
    ),
  );
}

/// 积分不足：引导充值 / 开通会员（2001）
void showPointsInsufficientDialog(BuildContext context, int points) {
  showDialog<void>(
    context: context,
    builder: (ctx) => AlertDialog(
      backgroundColor: AppColors.surface,
      title: const Text('积分不足'),
      content: Text('当前积分 $points，请充值或开通会员后继续观看'),
      actions: [
        TextButton(
          onPressed: () {
            Navigator.of(ctx).pop();
            context.push('/membership');
          },
          child: const Text('开通会员', style: TextStyle(color: AppColors.gold)),
        ),
        ElevatedButton(
          onPressed: () {
            Navigator.of(ctx).pop();
            context.push('/recharge');
          },
          child: const Text('去充值'),
        ),
      ],
    ),
  );
}

/// 底部免费剩余次数提示条：游客/非会员且剩余 ≤3 时显示（《01-开发文档》5.2.1）
class FreeQuotaBanner extends StatelessWidget {
  const FreeQuotaBanner({super.key, required this.remaining});

  /// 今日免费剩余次数；null（未上报过）或 >3 不显示
  final int? remaining;

  @override
  Widget build(BuildContext context) {
    final r = remaining;
    if (r == null || r > 3) return const SizedBox.shrink();
    return SafeArea(
      child: Container(
        width: double.infinity,
        color: Colors.black.withValues(alpha: 0.6),
        padding: const EdgeInsets.symmetric(vertical: 6),
        child: Text(
          r > 0 ? '今日免费观看剩余 $r 次' : '今日免费次数已用完，登录后继续观看',
          textAlign: TextAlign.center,
          style: const TextStyle(color: AppColors.gold, fontSize: 12),
        ),
      ),
    );
  }
}

/// 双击点赞的大爱心飘出动画
class LikeBurst extends StatefulWidget {
  const LikeBurst({super.key, required this.trigger});

  /// 每次双击递增触发动画（0 不显示）
  final int trigger;

  @override
  State<LikeBurst> createState() => LikeBurstState();
}

class LikeBurstState extends State<LikeBurst>
    with SingleTickerProviderStateMixin {
  late final AnimationController _controller = AnimationController(
    vsync: this,
    duration: const Duration(milliseconds: 700),
  );
  late final Animation<double> _scale = TweenSequence<double>([
    TweenSequenceItem(tween: Tween(begin: 0.0, end: 1.2), weight: 30),
    TweenSequenceItem(tween: Tween(begin: 1.2, end: 1.0), weight: 20),
    TweenSequenceItem(tween: Tween(begin: 1.0, end: 1.0), weight: 50),
  ]).animate(_controller);
  late final Animation<double> _opacity = TweenSequence<double>([
    TweenSequenceItem(tween: Tween(begin: 1.0, end: 1.0), weight: 70),
    TweenSequenceItem(tween: Tween(begin: 1.0, end: 0.0), weight: 30),
  ]).animate(_controller);

  @override
  void didUpdateWidget(LikeBurst oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (widget.trigger != oldWidget.trigger && widget.trigger > 0) {
      _controller.forward(from: 0);
    }
  }

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

  @override
  Widget build(BuildContext context) {
    if (widget.trigger <= 0) return const SizedBox.shrink();
    return Center(
      child: AnimatedBuilder(
        animation: _controller,
        builder: (_, __) => Opacity(
          opacity: _opacity.value,
          child: Transform.scale(
            scale: _scale.value,
            child: const Icon(Icons.favorite, size: 96, color: AppColors.primary),
          ),
        ),
      ),
    );
  }
}