// lib/widgets/song_artwork.dart
import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/material.dart';

/// 歌曲封面：优先进内存字节，其次本地封面文件，最后回退图标。
///
/// 列表页一次会构建几十行，这里用 `existsSync` 判断一次即可，
/// 图片本身由 Flutter 按需解码。
class SongArtwork extends StatelessWidget {
  final Uint8List? bytes;
  final String? filePath;
  final double size;
  final IconData fallbackIcon;
  final Color? fallbackColor;

  const SongArtwork({
    super.key,
    this.bytes,
    this.filePath,
    this.size = 44,
    this.fallbackIcon = Icons.music_note,
    this.fallbackColor,
  });

  @override
  Widget build(BuildContext context) {
    Widget child;
    if (bytes != null && bytes!.isNotEmpty) {
      child = Image.memory(
        bytes!,
        width: size,
        height: size,
        fit: BoxFit.cover,
        gaplessPlayback: true,
        errorBuilder: (_, __, ___) => _fallback(),
      );
    } else if (filePath != null &&
        filePath!.isNotEmpty &&
        File(filePath!).existsSync()) {
      child = Image.file(
        File(filePath!),
        width: size,
        height: size,
        fit: BoxFit.cover,
        gaplessPlayback: true,
        errorBuilder: (_, __, ___) => _fallback(),
      );
    } else {
      child = _fallback();
    }

    return ClipRRect(
      borderRadius: BorderRadius.circular(6),
      child: SizedBox(width: size, height: size, child: child),
    );
  }

  Widget _fallback() {
    return Container(
      width: size,
      height: size,
      color: const Color(0xFF232928),
      child: Icon(
        fallbackIcon,
        size: size * 0.55,
        color: fallbackColor ?? const Color(0xFFB8D4D0),
      ),
    );
  }
}