/// 时间: 2026-04-03
/// 功能: 骨架屏组件
/// 介绍: 用于在数据加载时显示占位动画，避免页面闪白
/// 最新变化: 新建文件

import 'package:flutter/material.dart';

/// 骨架屏基础组件
class SkeletonContainer extends StatefulWidget {
  final double width;
  final double height;
  final double borderRadius;
  final Color? baseColor;
  final Color? highlightColor;

  const SkeletonContainer({
    super.key,
    required this.width,
    required this.height,
    this.borderRadius = 8,
    this.baseColor,
    this.highlightColor,
  });

  @override
  State<SkeletonContainer> createState() => _SkeletonContainerState();
}

class _SkeletonContainerState extends State<SkeletonContainer>
    with SingleTickerProviderStateMixin {
  late AnimationController _controller;
  late Animation<double> _animation;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: const Duration(milliseconds: 1500),
      vsync: this,
    )..repeat();
    _animation = Tween<double>(begin: -1, end: 2).animate(
      CurvedAnimation(parent: _controller, curve: Curves.easeInOutSine),
    );
  }

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

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _animation,
      builder: (context, child) {
        return Container(
          width: widget.width,
          height: widget.height,
          decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(widget.borderRadius),
            gradient: LinearGradient(
              begin: Alignment.centerLeft,
              end: Alignment.centerRight,
              colors: [
                widget.baseColor ?? Colors.grey[300]!,
                widget.highlightColor ?? Colors.grey[100]!,
                widget.baseColor ?? Colors.grey[300]!,
              ],
              stops: [
                _animation.value - 0.3,
                _animation.value,
                _animation.value + 0.3,
              ],
            ),
          ),
        );
      },
    );
  }
}

/// 诗词卡片骨架屏
class PoetryCardSkeleton extends StatelessWidget {
  final bool isDark;

  const PoetryCardSkeleton({super.key, this.isDark = false});

  @override
  Widget build(BuildContext context) {
    final baseColor = isDark ? const Color(0xFF3A3A3A) : Colors.grey[300];
    final highlightColor = isDark ? const Color(0xFF4A4A4A) : Colors.grey[100];

    return Container(
      margin: const EdgeInsets.symmetric(horizontal: 16),
      decoration: BoxDecoration(
        color: isDark ? const Color(0xFF2A2A2A) : Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withAlpha(isDark ? 40 : 10),
            blurRadius: 8,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // 标题区域骨架
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
            child: SkeletonContainer(
              width: double.infinity,
              height: 24,
              borderRadius: 4,
              baseColor: baseColor,
              highlightColor: highlightColor,
            ),
          ),
          // 诗句名称区域骨架
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
            child: Column(
              children: [
                SkeletonContainer(
                  width: 120,
                  height: 28,
                  borderRadius: 4,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
                const SizedBox(height: 8),
                SkeletonContainer(
                  width: 80,
                  height: 16,
                  borderRadius: 4,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
              ],
            ),
          ),
          // 原文区域骨架
          Padding(
            padding: const EdgeInsets.all(16),
            child: Column(
              children: [
                SkeletonContainer(
                  width: double.infinity,
                  height: 20,
                  borderRadius: 4,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
                const SizedBox(height: 8),
                SkeletonContainer(
                  width: double.infinity,
                  height: 20,
                  borderRadius: 4,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
                const SizedBox(height: 8),
                SkeletonContainer(
                  width: double.infinity,
                  height: 20,
                  borderRadius: 4,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
                const SizedBox(height: 8),
                SkeletonContainer(
                  width: 150,
                  height: 20,
                  borderRadius: 4,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
              ],
            ),
          ),
          // 关键词区域骨架
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
            child: Wrap(
              spacing: 8,
              runSpacing: 8,
              children: [
                SkeletonContainer(
                  width: 60,
                  height: 24,
                  borderRadius: 12,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
                SkeletonContainer(
                  width: 80,
                  height: 24,
                  borderRadius: 12,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
                SkeletonContainer(
                  width: 70,
                  height: 24,
                  borderRadius: 12,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
              ],
            ),
          ),
          // 译文区域骨架
          Padding(
            padding: const EdgeInsets.all(16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                SkeletonContainer(
                  width: 80,
                  height: 18,
                  borderRadius: 4,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
                const SizedBox(height: 12),
                SkeletonContainer(
                  width: double.infinity,
                  height: 16,
                  borderRadius: 4,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
                const SizedBox(height: 8),
                SkeletonContainer(
                  width: double.infinity,
                  height: 16,
                  borderRadius: 4,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
                const SizedBox(height: 8),
                SkeletonContainer(
                  width: double.infinity,
                  height: 16,
                  borderRadius: 4,
                  baseColor: baseColor,
                  highlightColor: highlightColor,
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}