// lib/pages/player_page.dart
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../services/audio_service.dart';

class PlayerPage extends StatefulWidget {
  const PlayerPage({super.key});

  @override
  State<PlayerPage> createState() => _PlayerPageState();
}

class _PlayerPageState extends State<PlayerPage> {
  // ✅ 使用 late，但不赋值，在 didChangeDependencies 中初始化
  late AudioService _audioService;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    // ✅ 只在第一次或 service 变化时赋值
    _audioService = context.watch<AudioService>();
  }

  String _formatDuration(Duration d) {
    final minutes = d.inMinutes;
    final seconds = d.inSeconds % 60;
    return '${minutes.toString().padLeft(2, '0')}:${seconds.toString().padLeft(2, '0')}';
  }

  @override
  Widget build(BuildContext context) {
    // ✅ 使用 watch 实时获取状态
    final service = context.watch<AudioService>();
    final song = service.currentSong;

    if (song == null) {
      return Scaffold(
        backgroundColor: const Color(0xFF0E1211),
        body: const Center(
          child: Text(
            '没有正在播放的歌曲',
            style: TextStyle(color: Colors.grey),
          ),
        ),
      );
    }

    final position = service.position;
    final duration = service.duration;
    final isPlaying = service.isPlaying;
    final progress = duration.inMilliseconds > 0
        ? position.inMilliseconds / duration.inMilliseconds
        : 0.0;

    return Scaffold(
      backgroundColor: const Color(0xFF0E1211),
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0,
        leading: IconButton(
          icon: const Icon(Icons.arrow_back_ios_new, color: Colors.white),
          onPressed: () => Navigator.pop(context),
        ),
        actions: [
          IconButton(
            icon: const Icon(Icons.more_vert, color: Colors.white54),
            onPressed: () {},
          ),
        ],
      ),
      body: Padding(
        padding: const EdgeInsets.symmetric(horizontal: 24),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Container(
              width: 280,
              height: 280,
              decoration: BoxDecoration(
                shape: BoxShape.circle,
                color: const Color(0xFF2A3332),
                boxShadow: [
                  BoxShadow(
                    color: const Color(0xFF7C9A9E).withOpacity(0.15),
                    blurRadius: 60,
                    spreadRadius: 10,
                  ),
                ],
              ),
              child: const Icon(
                Icons.music_note,
                size: 80,
                color: Colors.white24,
              ),
            ),
            const SizedBox(height: 48),
            Column(
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Text(
                  song.title,
                  style: const TextStyle(
                    fontSize: 22,
                    fontWeight: FontWeight.w600,
                    color: Colors.white,
                  ),
                  textAlign: TextAlign.center,
                ),
                const SizedBox(height: 8),
                Text(
                  song.artist,
                  style: TextStyle(
                    fontSize: 16,
                    color: Colors.grey[400],
                  ),
                  textAlign: TextAlign.center,
                ),
              ],
            ),
            const SizedBox(height: 40),
            Column(
              children: [
                Slider(
                  value: progress.clamp(0.0, 1.0),
                  onChanged: (value) {
                    final newPosition = Duration(
                      milliseconds: (value * duration.inMilliseconds).round(),
                    );
                    service.seekTo(newPosition);
                  },
                  activeColor: const Color(0xFFB8D4D0),
                  inactiveColor: Colors.grey[800],
                ),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text(
                      _formatDuration(position),
                      style: TextStyle(
                        fontSize: 12,
                        color: Colors.grey[500],
                      ),
                    ),
                    Text(
                      _formatDuration(duration),
                      style: TextStyle(
                        fontSize: 12,
                        color: Colors.grey[500],
                      ),
                    ),
                  ],
                ),
              ],
            ),
            const SizedBox(height: 32),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                IconButton(
                  onPressed: () {},
                  icon: const Icon(Icons.skip_previous, size: 32),
                  color: Colors.white60,
                  padding: const EdgeInsets.all(16),
                ),
                const SizedBox(width: 24),
                Container(
                  width: 64,
                  height: 64,
                  decoration: BoxDecoration(
                    color: const Color(0xFFB8D4D0),
                    shape: BoxShape.circle,
                  ),
                  child: IconButton(
                    icon: Icon(
                      isPlaying ? Icons.pause : Icons.play_arrow,
                      color: Colors.black87,
                      size: 32,
                    ),
                    padding: EdgeInsets.zero,
                    onPressed: () {
                      service.togglePlay();
                    },
                  ),
                ),
                const SizedBox(width: 24),
                IconButton(
                  onPressed: () {},
                  icon: const Icon(Icons.skip_next, size: 32),
                  color: Colors.white60,
                  padding: const EdgeInsets.all(16),
                ),
              ],
            ),
            const SizedBox(height: 32),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                IconButton(
                  onPressed: () {},
                  icon: const Icon(Icons.volume_up_outlined),
                  color: Colors.white38,
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}