import 'dart:io';
import 'dart:typed_data';
import 'dart:ui' as ui;
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:food_hub_app/widgets/common/index.dart';
import 'package:path_provider/path_provider.dart';
import 'package:share_plus/share_plus.dart';

/// 截图工具类
class ScreenshotUtil {
  static double pixelRatio = 3.0;
  static Duration delay = const Duration(milliseconds: 50);
  static String watermarkText = '来自 食光集';

  // 截图功能
  static Future<Uint8List?> captureImage({required GlobalKey globalKey}) async {
    // 等待一帧确保UI已渲染
    await Future.delayed(delay);
    final RenderObject? render = globalKey.currentContext!.findRenderObject();
    final RenderRepaintBoundary boundary = render as RenderRepaintBoundary;
    final ui.Image image = await boundary.toImage(pixelRatio: pixelRatio);

    // 添加水印
    return await _addWatermarkToImage(image);
  }

  // 添加水印到图片
  static Future<Uint8List> _addWatermarkToImage(ui.Image image) async {
    // 创建画布
    final recorder = ui.PictureRecorder();
    final canvas = Canvas(recorder);

    // 绘制原始图片
    canvas.drawImage(image, Offset.zero, Paint());

    // 添加文字水印
    _drawTextWatermark(canvas, image);

    // 生成最终图片
    final picture = recorder.endRecording();
    final watermarkedImage = await picture.toImage(image.width, image.height);
    final ByteData? byteData = await watermarkedImage.toByteData(
      format: ui.ImageByteFormat.png,
    );

    return byteData!.buffer.asUint8List();
  }

  // 绘制文字水印
  static void _drawTextWatermark(Canvas canvas, ui.Image image) {
    final textPainter = TextPainter(
      text: TextSpan(
        text: watermarkText,
        style: TextStyle(
          color: Color(0x99FFFFFF),
          fontSize: 28,
          fontFamily: 'CustomFont',
          fontWeight: FontWeight.w600,
        ),
      ),
      textDirection: TextDirection.ltr,
    );

    textPainter.layout(maxWidth: image.width.toDouble());

    // 计算水印位置（右下角，带边距）
    final double x = image.width - textPainter.width - 40;
    final double y = image.height - textPainter.height - 40;

    // 绘制文字背景
    final backgroundPaint =
        Paint()
          ..color = const ui.Color(0x4D000000)
          ..style = PaintingStyle.fill;

    // 绘制圆角矩形背景
    final backgroundRect = RRect.fromRectAndRadius(
      Rect.fromLTWH(
        x - 12,
        y - 6,
        textPainter.width + 24,
        textPainter.height + 12,
      ),
      Radius.circular(6),
    );
    canvas.drawRRect(backgroundRect, backgroundPaint);

    // 绘制文字
    textPainter.paint(canvas, Offset(x, y));
  }

  // 保存图片到临时文件
  static Future<File> saveImageToFile(Uint8List bytes, String fileName) async {
    final directory = await getTemporaryDirectory();
    final File imageFile = File('${directory.path}/$fileName');
    await imageFile.writeAsBytes(bytes);
    return imageFile;
  }

  static Future<void> captureAndShare({
    required GlobalKey globalKey,
    required String fileName,
    required String shareText,
  }) async {
    try {
      final imageBytes = await captureImage(globalKey: globalKey);

      if (imageBytes != null) {
        final imageFile = await saveImageToFile(imageBytes, fileName);
        await SharePlus.instance.share(
          ShareParams(files: [XFile(imageFile.path)], text: shareText),
        );

        // 分享后删除临时文件
        await imageFile.delete();
      } else {
        showErrorToast('生成图片失败，请重试');
      }
    } catch (e) {
      showErrorToast('分享失败: $e');
    }
  }
}