import 'package:flutter/material.dart';
import 'package:flutter/services.dart' show rootBundle, ByteData;
import 'dart:ui' as ui;
import 'package:aesthetica_wallpaper/models/recipe.dart';
import 'wallpaper_preview_painter.dart';

// 全屏预览对话框
class FullScreenPreviewDialog extends StatefulWidget {
  final Recipe recipe;

  const FullScreenPreviewDialog({super.key, required this.recipe});

  @override
  State<FullScreenPreviewDialog> createState() =>
      _FullScreenPreviewDialogState();
}

class _FullScreenPreviewDialogState extends State<FullScreenPreviewDialog> {
  bool _isHomeScreen = true; // true = 主页, false = 锁屏
  ui.Image? _loadedImage;
  bool _isLoading = true;

  @override
  void initState() {
    super.initState();
    _loadImage();
  }

  // 异步加载图片
  Future<void> _loadImage() async {
    try {
      final ByteData data = await rootBundle.load(widget.recipe.baseImagePath);
      final ui.Codec codec = await ui.instantiateImageCodec(
        data.buffer.asUint8List(),
      );
      final ui.FrameInfo fi = await codec.getNextFrame();

      if (mounted) {
        setState(() {
          _loadedImage = fi.image;
          _isLoading = false;
        });
      }
    } catch (e) {
      if (mounted) {
        setState(() => _isLoading = false);
      }
      debugPrint("Error loading image: $e");
    }
  }

  @override
  Widget build(BuildContext context) {
    final screenSize = MediaQuery.of(context).size;
    final isSmallScreen = screenSize.width < 600 || screenSize.height < 800;

    return Dialog(
      backgroundColor: Colors.transparent,
      insetPadding: EdgeInsets.all(isSmallScreen ? 8 : 16),
      child: Container(
        width: double.infinity,
        height: double.infinity,
        decoration: BoxDecoration(
          color: Colors.black,
          borderRadius: BorderRadius.circular(isSmallScreen ? 12 : 20),
        ),
        child: Stack(
          children: [
            // 全屏壁纸预览
            Positioned.fill(
              child: ClipRRect(
                borderRadius: BorderRadius.circular(isSmallScreen ? 12 : 20),
                child: _buildWallpaperPreview(isSmallScreen),
              ),
            ),
            // 顶部控制栏
            Positioned(
              top: 0,
              left: 0,
              right: 0,
              child: Container(
                padding: EdgeInsets.symmetric(
                  horizontal: isSmallScreen ? 12 : 20,
                  vertical: isSmallScreen ? 8 : 16,
                ),
                decoration: BoxDecoration(
                  gradient: LinearGradient(
                    colors: [
                      Colors.black.withValues(alpha: 0.8),
                      Colors.transparent,
                    ],
                    begin: Alignment.topCenter,
                    end: Alignment.bottomCenter,
                  ),
                ),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    // 关闭按钮
                    IconButton(
                      onPressed: () => Navigator.of(context).pop(),
                      icon: Icon(
                        Icons.close,
                        color: Colors.white,
                        size: isSmallScreen ? 20 : 24,
                      ),
                      padding: EdgeInsets.all(isSmallScreen ? 4 : 8),
                      constraints: const BoxConstraints(),
                    ),
                    // 预览模式切换
                    Container(
                      decoration: BoxDecoration(
                        color: Colors.black.withValues(alpha: 0.5),
                        borderRadius: BorderRadius.circular(
                          isSmallScreen ? 16 : 20,
                        ),
                      ),
                      child: Row(
                        mainAxisSize: MainAxisSize.min,
                        children: [
                          _buildModeButton(
                            'Home',
                            Icons.home,
                            true,
                            isSmallScreen,
                          ),
                          _buildModeButton(
                            'Lock',
                            Icons.lock,
                            false,
                            isSmallScreen,
                          ),
                        ],
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildModeButton(
    String label,
    IconData icon,
    bool isHome,
    bool isSmallScreen,
  ) {
    final isSelected = _isHomeScreen == isHome;
    return GestureDetector(
      onTap: () {
        setState(() {
          _isHomeScreen = isHome;
        });
      },
      child: Container(
        padding: EdgeInsets.symmetric(
          horizontal: isSmallScreen ? 10 : 16,
          vertical: isSmallScreen ? 6 : 8,
        ),
        decoration: BoxDecoration(
          color: isSelected ? Colors.pinkAccent : Colors.transparent,
          borderRadius: BorderRadius.circular(isSmallScreen ? 12 : 16),
        ),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(
              icon,
              color: isSelected ? Colors.white : Colors.grey[400],
              size: isSmallScreen ? 14 : 16,
            ),
            SizedBox(width: isSmallScreen ? 3 : 4),
            Text(
              label,
              style: TextStyle(
                color: isSelected ? Colors.white : Colors.grey[400],
                fontSize: isSmallScreen ? 11 : 12,
                fontWeight: FontWeight.w500,
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildWallpaperPreview(bool isSmallScreen) {
    if (_isLoading) {
      return Container(
        color: Colors.black,
        child: const Center(
          child: CircularProgressIndicator(color: Colors.pinkAccent),
        ),
      );
    }

    if (_loadedImage == null) {
      return Container(
        color: Colors.grey[800],
        child: const Center(
          child: Icon(Icons.image_not_supported, color: Colors.grey, size: 60),
        ),
      );
    }

    return Stack(
      fit: StackFit.expand,
      children: [
        // 壁纸图片
        CustomPaint(
          painter: WallpaperPreviewPainter(
            image: _loadedImage!,
            recipe: widget.recipe,
          ),
          child: Container(),
        ),
        // UI覆盖层
        _isHomeScreen
            ? _buildHomeScreenUI(isSmallScreen)
            : _buildLockScreenUI(isSmallScreen),
      ],
    );
  }

  Widget _buildHomeScreenUI(bool isSmallScreen) {
    return Stack(
      children: [
        // 模拟主页内容
        Positioned(
          top: isSmallScreen ? 30 : 50,
          left: isSmallScreen ? 12 : 20,
          right: isSmallScreen ? 12 : 20,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                'Good Morning',
                style: TextStyle(
                  color: Colors.white,
                  fontSize: isSmallScreen ? 18 : 24,
                  fontWeight: FontWeight.bold,
                ),
              ),
              SizedBox(height: isSmallScreen ? 4 : 8),
              Text(
                'Monday, October 23',
                style: TextStyle(
                  color: Colors.white.withValues(alpha: 0.8),
                  fontSize: isSmallScreen ? 13 : 16,
                ),
              ),
            ],
          ),
        ),
        // 底部Dock
        Positioned(
          bottom: isSmallScreen ? 12 : 20,
          left: isSmallScreen ? 12 : 20,
          right: isSmallScreen ? 12 : 20,
          child: Container(
            padding: EdgeInsets.symmetric(
              horizontal: isSmallScreen ? 12 : 20,
              vertical: isSmallScreen ? 8 : 12,
            ),
            decoration: BoxDecoration(
              color: Colors.black.withValues(alpha: 0.3),
              borderRadius: BorderRadius.circular(isSmallScreen ? 16 : 20),
            ),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: [
                _buildDockIcon(Icons.phone, isSmallScreen),
                _buildDockIcon(Icons.message, isSmallScreen),
                _buildDockIcon(Icons.camera_alt, isSmallScreen),
                _buildDockIcon(Icons.music_note, isSmallScreen),
              ],
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildLockScreenUI(bool isSmallScreen) {
    return Stack(
      children: [
        // 时间显示
        Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                '9:41',
                style: TextStyle(
                  color: Colors.white,
                  fontSize: isSmallScreen ? 36 : 48,
                  fontWeight: FontWeight.w300,
                ),
              ),
              SizedBox(height: isSmallScreen ? 4 : 8),
              Text(
                'Monday, October 23',
                style: TextStyle(
                  color: Colors.white.withValues(alpha: 0.8),
                  fontSize: isSmallScreen ? 13 : 16,
                ),
              ),
            ],
          ),
        ),
        // 底部控制
        Positioned(
          bottom: isSmallScreen ? 30 : 50,
          left: 0,
          right: 0,
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: [
              _buildLockIcon(Icons.flashlight_off, isSmallScreen),
              _buildLockIcon(Icons.camera_alt, isSmallScreen),
            ],
          ),
        ),
      ],
    );
  }

  Widget _buildDockIcon(IconData icon, bool isSmallScreen) {
    return Container(
      padding: EdgeInsets.all(isSmallScreen ? 8 : 12),
      decoration: BoxDecoration(
        color: Colors.white.withValues(alpha: 0.1),
        borderRadius: BorderRadius.circular(isSmallScreen ? 10 : 12),
      ),
      child: Icon(icon, color: Colors.white, size: isSmallScreen ? 20 : 24),
    );
  }

  Widget _buildLockIcon(IconData icon, bool isSmallScreen) {
    return Container(
      padding: EdgeInsets.all(isSmallScreen ? 12 : 16),
      decoration: BoxDecoration(
        color: Colors.white.withValues(alpha: 0.2),
        shape: BoxShape.circle,
      ),
      child: Icon(icon, color: Colors.white, size: isSmallScreen ? 20 : 24),
    );
  }
}