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

/// 品牌配置编辑（启动图 + Logo）。
///
/// 通过 [ImagePicker] 选择本地图片，并用「手机外框」预览：
/// - 启动图为全屏背景；
/// - Logo 为右下角角标。
///
/// [splashUrl]/[logoUrl] 为本地图片路径（占位），由父级保存。
class BrandingEditor extends StatefulWidget {
  const BrandingEditor({
    super.key,
    this.initialSplashUrl,
    this.initialLogoUrl,
  });

  final String? initialSplashUrl;
  final String? initialLogoUrl;

  @override
  State<BrandingEditor> createState() => BrandingEditorState();
}

/// 品牌编辑器状态（公开，供父级通过 GlobalKey 读取所选图片路径）。
class BrandingEditorState extends State<BrandingEditor> {
  final ImagePicker _picker = ImagePicker();
  String? _splashUrl;
  String? _logoUrl;

  @override
  void initState() {
    super.initState();
    _splashUrl = widget.initialSplashUrl;
    _logoUrl = widget.initialLogoUrl;
  }

  Future<void> _pickSplash() async {
    final xFile = await _picker.pickImage(source: ImageSource.gallery);
    if (xFile != null && mounted) {
      setState(() => _splashUrl = xFile.path);
    }
  }

  Future<void> _pickLogo() async {
    final xFile = await _picker.pickImage(source: ImageSource.gallery);
    if (xFile != null && mounted) {
      setState(() => _logoUrl = xFile.path);
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          children: [
            Expanded(
              child: FilledButton.tonal(
                onPressed: _pickSplash,
                child: const Text('选择启动图'),
              ),
            ),
            const SizedBox(width: 12),
            Expanded(
              child: FilledButton.tonal(
                onPressed: _pickLogo,
                child: const Text('选择 Logo'),
              ),
            ),
          ],
        ),
        const SizedBox(height: 12),
        // 手机外框预览。
        Center(
          child: Container(
            width: 200,
            height: 380,
            decoration: BoxDecoration(
              color: Colors.black,
              borderRadius: BorderRadius.circular(28),
              border: Border.all(color: Colors.black87, width: 8),
              boxShadow: [
                BoxShadow(
                  color: Colors.black.withOpacity(0.2),
                  blurRadius: 12,
                  offset: const Offset(0, 6),
                ),
              ],
            ),
            clipBehavior: Clip.antiAlias,
            child: Stack(
              children: [
                // 启动图全屏背景。
                if (_splashUrl != null && _splashUrl!.isNotEmpty)
                  Positioned.fill(
                    child: Image.network(
                      _splashUrl!,
                      fit: BoxFit.cover,
                      errorBuilder: (_, __, ___) => Container(
                        color: theme.colorScheme.primaryContainer,
                      ),
                    ),
                  )
                else
                  Positioned.fill(
                    child: Container(
                      color: theme.colorScheme.primaryContainer,
                      child: Center(
                        child: Text(
                          '启动图预览',
                          style: TextStyle(
                            color: theme.colorScheme.onPrimaryContainer,
                          ),
                        ),
                      ),
                    ),
                  ),
                // 顶部状态栏占位。
                Positioned(
                  top: 8,
                  left: 0,
                  right: 0,
                  child: Container(
                    height: 18,
                    color: Colors.black.withOpacity(0.25),
                  ),
                ),
                // Logo 右下角角标。
                if (_logoUrl != null && _logoUrl!.isNotEmpty)
                  Positioned(
                    right: 16,
                    bottom: 24,
                    child: Container(
                      width: 56,
                      height: 56,
                      decoration: const BoxDecoration(
                        color: Colors.white,
                        shape: BoxShape.circle,
                        boxShadow: [
                          BoxShadow(
                            color: Colors.black26,
                            blurRadius: 6,
                            offset: Offset(0, 2),
                          ),
                        ],
                      ),
                      child: ClipOval(
                        child: Image.network(
                          _logoUrl!,
                          fit: BoxFit.cover,
                          errorBuilder: (_, __, ___) =>
                              const Icon(Icons.image, size: 28),
                        ),
                      ),
                    ),
                  ),
              ],
            ),
          ),
        ),
      ],
    );
  }

  /// 当前启动图本地路径（未选返回 null）。
  String? get splashUrl => _splashUrl;

  /// 当前 Logo 本地路径（未选返回 null）。
  String? get logoUrl => _logoUrl;
}