/* eslint-disable no-async-promise-executor */
import { fabric } from "fabric-with-all";
import { LayerType, OperationType, createBitmapLayer } from "./layerHelper";
// 导入新的复合命令
import { CreateImageLayerCommand } from "../commands/LayerCommands";
// 导入新的命令
import { ChangeFixedImageCommand, AddImageToLayerCommand } from "../commands/LayerCommands";
import { generateId } from "./helper";
import { isBoolean } from "lodash-es";

/**
 * 加载并处理图片
 * @param {string} imageSource - 图片URL或Base64字符串
 * @param {Object} options - 配置选项
 * @param {number} options.maxWidth - 最大宽度
 * @param {number} options.maxHeight - 最大高度
 * @param {boolean} options.centerOnCanvas - 是否居中图片
 * @param {function} options.onLoad - 加载完成回调
 * @returns {Promise<Object>} - 返回图片对象的Promise
 */
export function loadImage(imageSource, options = {}) {
  return new Promise((resolve, reject) => {
    fabric.Image.fromURL(
      imageSource,
      (fabricImage) => {
        if (!fabricImage) {
          reject(new Error("加载图片失败"));
          return;
        }

        // 计算缩放比例
        const imgWidth = fabricImage.width;
        const imgHeight = fabricImage.height;

        // 应用缩放
        if (options.maxWidth && options.maxHeight) {
          const scaleX = options.maxWidth / imgWidth;
          const scaleY = options.maxHeight / imgHeight;
          const scale = Math.min(scaleX, scaleY, 1); // 不超过原始大小

          fabricImage.scale(scale);
        }

        // 设置图片位置 - 默认居中
        if (options.centerOnCanvas !== false) {
          fabricImage.set({
            id: generateId("fabricImage"),
            left: (options.canvasWidth || 800) / 2,
            top: (options.canvasHeight || 600) / 2,
            originX: "center",
            originY: "center",
            selectable: true,
            hasControls: true,
            hasBorders: true,
          });
        }

        // 执行加载完成回调
        if (typeof options.onLoad === "function") {
          options.onLoad(fabricImage);
        }

        resolve(fabricImage);
      },
      { crossOrigin: "anonymous" }
    );
  });
}

/**
 * 创建图片图层
 * @param {Object} layerManager - 图层管理器
 * @param {Object} fabricImage - fabric图片对象
 * @param {Object} toolManager - 工具管理器
 * @param {string} layerName - 图层名称 (可选)
 * @returns {Promise<string>} 新图层ID
 */
export async function createImageLayer({
  layerManager,
  fabricImage,
  toolManager,
  layerName = null,
  undoable,
} = {}) {
  if (!layerManager || !fabricImage) {
    console.error("图层管理器或图片对象无效");
    return null;
  }

  try {
    // 使用新的复合命令
    const createImageLayerCmd = new CreateImageLayerCommand({
      layerManager,
      fabricImage,
      toolManager,
      layerName,
    });

    // 设置命令的撤销状态
    if (isBoolean(undoable)) createImageLayerCmd.undoable = undoable; // 是否撤销

    // 执行复合命令
    const newLayerId = await layerManager.commandManager.execute(createImageLayerCmd);

    return newLayerId;
  } catch (error) {
    console.error("创建图片图层失败:", error);
    throw error;
  }
}

/**
 * 更改固定图层的图像
 * @param {Object} options - 配置选项
 * @param {Object} options.layerManager - 图层管理器
 * @param {string} options.fixedLayerId - 固定图层ID
 * @param {Object} options.fabricImage - 新的图像对象
 * @returns {Promise<boolean>} 是否成功更改
 */
export async function changeFixedImage({ layerManager, fixedLayerId, fabricImage } = {}) {
  if (!layerManager || !fixedLayerId || !fabricImage) {
    console.error("更改固定图层图像：参数无效");
    return false;
  }

  try {
    // 创建更改固定图层图像命令
    const changeFixedImageCmd = new ChangeFixedImageCommand({
      canvas: layerManager.canvas,
      layers: layerManager.layers,
      fixedLayerId,
      newImage: fabricImage,
      layerManager,
    });

    // 通过命令管理器执行
    const result = await layerManager.commandManager.execute(changeFixedImageCmd);

    if (result) {
      console.log(`✅ 成功更改固定图层 "${fixedLayerId}" 的图像`);
    }

    return result;
  } catch (error) {
    console.error("更改固定图层图像失败:", error);
    throw error;
  }
}

/**
 * 添加图片到指定图层或创建新图层
 * @param {Object} options - 配置选项
 * @param {Object} options.layerManager - 图层管理器
 * @param {Object} options.toolManager - 工具管理器
 * @param {Object} options.fabricImage - 图像对象
 * @param {string} options.targetLayerId - 目标图层ID（可选，未指定则创建新图层）
 * @param {string} options.layerName - 图层名称（用于新建图层）
 * @returns {Promise<string>} 图层ID
 */
export async function addImageToLayer({
  layerManager,
  toolManager,
  fabricImage,
  targetLayerId = null,
  layerName = null,
} = {}) {
  if (!layerManager || !fabricImage) {
    console.error("添加图片到图层：参数无效");
    return null;
  }

  try {
    // 创建添加图片到图层命令
    const addImageToLayerCmd = new AddImageToLayerCommand({
      canvas: layerManager.canvas,
      layers: layerManager.layers,
      layerManager,
      toolManager,
      fabricImage,
      targetLayerId,
      layerName,
      activeLayerId: layerManager.activeLayerId,
    });

    // 通过命令管理器执行
    const resultLayerId = await layerManager.commandManager.execute(addImageToLayerCmd);

    if (resultLayerId) {
      if (targetLayerId) {
        console.log(`✅ 成功添加图片到现有图层 "${targetLayerId}"`);
      } else {
        console.log(`✅ 成功创建新图层 "${resultLayerId}" 并添加图片`);
      }
    }

    return resultLayerId;
  } catch (error) {
    console.error("添加图片到图层失败:", error);
    throw error;
  }
}

/**
 * 从base64或者url加载图片并创建图层
 * @param {str} imageUrl -  base64字符串或图片URL
 * @param {Object} layerManager - 图层管理器
 * @param {Object} canvas - fabric.js画布实例
 * @param {Object} options - 配置选项
 * @returns {Promise<string>} 新图层ID的Promise
 */
export function loadImageUrlToLayer({ imageUrl, layerManager, canvas, toolManager }, options = {}) {
  return new Promise(async (resolve, reject) => {
    if (!imageUrl || !layerManager || !canvas) {
      reject(new Error("参数无效"));
      return;
    }

    try {
      // 查找背景图层以获取尺寸
      const bgLayer = layerManager.layers.value.find((layer) => layer.isBackground);

      // 设置最大宽高为背景图层的尺寸
      const maxWidth = bgLayer?.canvasWidth || canvas.width;
      const maxHeight = bgLayer?.canvasHeight || canvas.height;

      // 加载并处理图片
      const fabricImage = await loadImage(imageUrl, {
        maxWidth: maxWidth * 0.8, // 默认图片最大宽度为背景宽度的80%
        maxHeight: maxHeight * 0.8, // 默认图片最大高度为背景高度的80%
        canvasWidth: canvas.width,
        canvasHeight: canvas.height,
        ...options,
      });

      if (options.imageMode) {
        imageModeHandler({
          imageMode: options.imageMode,
          newImage: fabricImage,
          canvasWidth: maxWidth,
          canvasHeight: maxHeight,
        });

        // 默认居中
        fabricImage.set({
          originX: "center",
          originY: "center",
          left: canvas.width / 2,
          top: canvas.height / 2,
        });
      }

      // 创建图片图层
      const layerId = await createImageLayer({
        layerManager,
        fabricImage,
        toolManager,
        ...options,
      });

      resolve(layerId);
    } catch (error) {
      console.error("处理图片失败:", error);
      reject(error);
    }
  });
}

/**
 * 从File对象加载图片并创建图层
 * @param {File} file - 文件对象
 * @param {Object} layerManager - 图层管理器
 * @param {Object} canvas - fabric.js画布实例
 * @param {Object} options - 配置选项
 * @returns {Promise<string>} 新图层ID的Promise
 */
export function uploadImageAndCreateLayer(
  { file, layerManager, canvas, toolManager },
  options = {}
) {
  return new Promise((resolve, reject) => {
    if (!file || !layerManager || !canvas) {
      reject(new Error("参数无效"));
      return;
    }

    const reader = new FileReader();

    reader.onload = async (e) => {
      try {
        // 查找背景图层以获取尺寸
        const bgLayer = layerManager.layers.value.find((layer) => layer.isBackground);

        // 设置最大宽高为背景图层的尺寸
        const maxWidth = bgLayer?.canvasWidth || canvas.width;
        const maxHeight = bgLayer?.canvasHeight || canvas.height;

        // 加载并处理图片
        const fabricImage = await loadImage(e.target.result, {
          maxWidth: maxWidth * 0.8, // 默认图片最大宽度为背景宽度的80%
          maxHeight: maxHeight * 0.8, // 默认图片最大高度为背景高度的80%
          canvasWidth: canvas.width,
          canvasHeight: canvas.height,
          ...options,
        });

        // 创建图片图层
        const layerId = await createImageLayer({
          layerManager,
          fabricImage,
          toolManager,
          layerName: file.name,
        });

        resolve(layerId);
      } catch (error) {
        console.error("处理图片失败:", error);
        reject(error);
      }
    };

    reader.onerror = (error) => {
      console.error("读取文件失败:", error);
      reject(error);
    };

    reader.readAsDataURL(file);
  });
}

/**
 * 安全加载图片
 * 添加错误处理和重试机制
 * @param {string} imageSource - 图片URL或Base64字符串
 * @param {Object} options - 配置选项
 * @returns {Promise<Object>} - 返回图片对象的Promise
 */
export function safeLoadImage(imageSource, options = {}) {
  return new Promise((resolve, reject) => {
    let retries = options.retries || 1;

    const attemptLoad = (attempt = 0) => {
      loadImage(imageSource, options)
        .then(resolve)
        .catch((error) => {
          if (attempt < retries) {
            console.warn(`图片加载失败，正在重试 (${attempt + 1}/${retries})...`);
            setTimeout(() => attemptLoad(attempt + 1), 500);
          } else {
            reject(error);
          }
        });
    };

    attemptLoad();
  });
}

/**
 * 从URL加载图片并更改固定图层
 * @param {Object} options - 配置选项
 * @param {string} options.imageUrl - 图片URL
 * @param {Object} options.layerManager - 图层管理器
 * @param {string} options.fixedLayerId - 固定图层ID
 * @param {Object} options.imageOptions - 图片加载选项
 * @returns {Promise<boolean>} 是否成功
 */
export function loadImageAndChangeFixedLayer({
  imageUrl,
  layerManager,
  fixedLayerId,
  imageOptions = {},
}) {
  return new Promise((resolve, reject) => {
    if (!imageUrl || !layerManager || !fixedLayerId) {
      reject(new Error("参数无效"));
      return;
    }

    loadImage(imageUrl, imageOptions)
      .then(async (fabricImage) => {
        try {
          const result = await changeFixedImage({
            layerManager,
            fixedLayerId,
            fabricImage,
          });
          resolve(result);
        } catch (error) {
          console.error("更改固定图层失败:", error);
          reject(error);
        }
      })
      .catch((error) => {
        console.error("加载图片失败:", error);
        reject(error);
      });
  });
}

/**
 * 从File对象更改固定图层图像
 * @param {Object} options - 配置选项
 * @param {File} options.file - 图像文件对象
 * @param {Object} options.layerManager - 图层管理器
 * @param {string} options.layerId - 固定图层ID
 * @param {Object} options.imageOptions - 图片加载选项
 * @returns {Promise<string>} 新图像对象ID的Promise
 */
export function uploadImageAndChangeFixedLayer({ file, layerManager, layerId, imageOptions = {} }) {
  return new Promise((resolve, reject) => {
    if (!file || !layerManager || !layerId) {
      reject(new Error("参数无效：需要文件、图层管理器和图层ID"));
      return;
    }

    // 验证文件类型
    if (!file.type.startsWith("image/")) {
      reject(new Error("无效的文件类型：必须是图像文件"));
      return;
    }

    const reader = new FileReader();

    reader.onload = async (e) => {
      try {
        // 查找目标固定图层以获取尺寸信息
        const targetLayer = layerManager.layers.value.find((layer) => layer.id === layerId);

        if (!targetLayer) {
          throw new Error(`找不到图层 ID: ${layerId}`);
        }

        // 验证是否为固定图层
        if (!targetLayer.isFixed && !targetLayer.isBackground) {
          throw new Error("只能更改固定图层或背景图层的图像");
        }

        // 查找背景图层以获取画布尺寸
        const bgLayer = layerManager.layers.value.find((layer) => layer.isBackground);

        const maxWidth = bgLayer?.canvasWidth || layerManager.canvas.width;
        const maxHeight = bgLayer?.canvasHeight || layerManager.canvas.height;

        // 加载并处理图片
        const fabricImage = await loadImage(e.target.result, {
          maxWidth: maxWidth,
          maxHeight: maxHeight,
          canvasWidth: layerManager.canvas.width,
          canvasHeight: layerManager.canvas.height,
          centerOnCanvas: true,
          ...imageOptions,
        });

        // 创建更改固定图层图像命令
        const changeFixedImageCmd = new ChangeFixedImageCommand({
          canvas: layerManager.canvas,
          layers: layerManager.layers,
          layerId: layerId,
          newImageFile: file,
          layerManager: layerManager,
        });

        // 通过命令管理器执行
        const newImageId = await layerManager.commandManager.execute(changeFixedImageCmd);

        if (newImageId) {
          console.log(`✅ 成功更改固定图层 "${targetLayer.name}" 的图像，新图像ID: ${newImageId}`);
          resolve(newImageId);
        } else {
          throw new Error("更改固定图层图像失败");
        }
      } catch (error) {
        console.error("处理图片失败:", error);
        reject(error);
      }
    };

    reader.onerror = (error) => {
      console.error("读取文件失败:", error);
      reject(new Error("文件读取失败"));
    };

    reader.readAsDataURL(file);
  });
}

/**
 * 从File对象加载图片并添加到指定图层 (简化版)
 * @param {Object} options - 配置选项
 * @param {File} options.file - 文件对象
 * @param {Object} options.layerManager - 图层管理器
 * @param {Object} options.toolManager - 工具管理器
 * @param {string} options.targetLayerId - 目标图层ID（可选）
 * @param {Object} options.imageOptions - 图片加载选项
 * @returns {Promise<Object>} 返回 { layerId, imageId, wasLayerCreated } 的Promise
 */
export function uploadImageAndAddToLayer({
  file,
  layerManager,
  toolManager,
  targetLayerId = null,
  imageOptions = {},
}) {
  return new Promise((resolve, reject) => {
    if (!file || !layerManager) {
      reject(new Error("参数无效：需要文件和图层管理器"));
      return;
    }

    // 验证文件类型
    if (!file.type.startsWith("image/")) {
      reject(new Error("无效的文件类型：必须是图像文件"));
      return;
    }

    // 创建添加图像到图层命令
    const addImageToLayerCmd = new AddImageToLayerCommand({
      canvas: layerManager.canvas,
      layers: layerManager.layers,
      activeLayerId: layerManager.activeLayerId,
      imageFile: file,
      targetLayerId: targetLayerId,
      layerManager: layerManager,
      toolManager: toolManager,
    });

    // 通过命令管理器执行
    layerManager.commandManager
      .execute(addImageToLayerCmd)
      .then((result) => {
        if (result) {
          console.log(`✅ 成功添加图像到图层，结果:`, result);
          resolve(result);
        } else {
          throw new Error("添加图像到图层失败");
        }
      })
      .catch((error) => {
        console.error("添加图像到图层失败:", error);
        reject(error);
      });
  });
}

/**
 * 从File对象加载图片并添加到指定图层 (简化版)
 * @param {Object} options - 配置选项
 * @param {File} options.file - 文件对象
 * @param {Object} options.layerManager - 图层管理器
 * @param {Object} options.toolManager - 工具管理器
 * @param {string} options.targetLayerId - 目标图层ID（可选）
 * @param {Object} options.imageOptions - 图片加载选项
 * @returns {Promise<Object>} 返回 { layerId, imageId, wasLayerCreated } 的Promise
 */
export function uploadImageAndAddToLayerSimple({
  file,
  layerManager,
  toolManager,
  targetLayerId = null,
  imageOptions = {},
}) {
  return new Promise((resolve, reject) => {
    if (!file || !layerManager) {
      reject(new Error("参数无效：需要文件和图层管理器"));
      return;
    }

    // 验证文件类型
    if (!file.type.startsWith("image/")) {
      reject(new Error("无效的文件类型：必须是图像文件"));
      return;
    }

    // 创建添加图像到图层命令
    const addImageToLayerCmd = new AddImageToLayerCommand({
      canvas: layerManager.canvas,
      layers: layerManager.layers,
      activeLayerId: layerManager.activeLayerId,
      imageFile: file,
      targetLayerId: targetLayerId,
      layerManager: layerManager,
      toolManager: toolManager,
    });

    // 通过命令管理器执行
    layerManager.commandManager
      .execute(addImageToLayerCmd)
      .then((result) => {
        if (result) {
          console.log(`✅ 成功添加图像到图层，结果:`, result);
          resolve(result);
        } else {
          throw new Error("添加图像到图层失败");
        }
      })
      .catch((error) => {
        console.error("添加图像到图层失败:", error);
        reject(error);
      });
  });
}

/**
 * 批量上传图片并创建图层
 * @param {Object} options - 配置选项
 * @param {FileList|Array<File>} options.files - 文件列表
 * @param {Object} options.layerManager - 图层管理器
 * @param {Object} options.canvas - fabric.js画布实例
 * @param {Object} options.toolManager - 工具管理器
 * @param {Object} options.imageOptions - 图片加载选项
 * @param {function} options.onProgress - 进度回调函数
 * @returns {Promise<Array<string>>} 新图层ID数组的Promise
 */
export async function batchUploadImagesAndCreateLayers({
  files,
  layerManager,
  canvas,
  toolManager,
  imageOptions = {},
  onProgress = null,
}) {
  if (!files || files.length === 0) {
    throw new Error("没有提供文件");
  }

  if (!layerManager || !canvas) {
    throw new Error("缺少必要的参数：图层管理器或画布");
  }

  const results = [];
  const errors = [];

  for (let i = 0; i < files.length; i++) {
    const file = files[i];

    try {
      // 调用进度回调
      if (typeof onProgress === "function") {
        onProgress({
          current: i + 1,
          total: files.length,
          fileName: file.name,
          status: "processing",
        });
      }

      // 验证文件类型
      if (!file.type.startsWith("image/")) {
        console.warn(`跳过非图像文件: ${file.name}`);
        continue;
      }

      // 上传图片并创建图层
      const layerId = await uploadImageAndCreateLayer(
        { file, layerManager, canvas, toolManager },
        imageOptions
      );

      results.push({
        fileName: file.name,
        layerId: layerId,
        success: true,
      });

      // 调用进度回调
      if (typeof onProgress === "function") {
        onProgress({
          current: i + 1,
          total: files.length,
          fileName: file.name,
          status: "success",
          layerId: layerId,
        });
      }

      console.log(`✅ 成功处理文件: ${file.name}, 图层ID: ${layerId}`);
    } catch (error) {
      console.error(`❌ 处理文件失败: ${file.name}`, error);

      errors.push({
        fileName: file.name,
        error: error.message,
        success: false,
      });

      // 调用进度回调
      if (typeof onProgress === "function") {
        onProgress({
          current: i + 1,
          total: files.length,
          fileName: file.name,
          status: "error",
          error: error.message,
        });
      }
    }
  }

  // 输出批量处理结果
  console.log(`📊 批量处理完成:`);
  console.log(`   ✅ 成功: ${results.length} 个文件`);
  console.log(`   ❌ 失败: ${errors.length} 个文件`);

  if (errors.length > 0) {
    console.warn("失败的文件:", errors);
  }

  return {
    results: results,
    errors: errors,
    successCount: results.length,
    errorCount: errors.length,
    total: files.length,
  };
}

/**
 * 高级图像管理工具
 * 提供批量图像处理、缓存、预加载等高级功能
 */
export class AdvancedImageManager {
  constructor(canvasManager) {
    this.canvasManager = canvasManager;
    this.canvas = canvasManager.canvas;
    this.layerManager = canvasManager.layerManager;

    // 图像缓存
    this.imageCache = new Map();
    this.preloadQueue = [];
    this.maxCacheSize = 50; // 最大缓存数量

    // 批量操作状态
    this.batchOperations = [];
    this.isBatchMode = false;

    // 性能监控
    this.performanceMetrics = {
      imageLoads: 0,
      cacheHits: 0,
      totalLoadTime: 0,
      averageLoadTime: 0,
    };
  }

  /**
   * 预加载图像列表
   * @param {Array} imageUrls 要预加载的图像URL数组
   * @param {Object} options 选项
   */
  async preloadImages(imageUrls, options = {}) {
    const {
      concurrency = 3, // 并发数量
      timeout = 10000,
      onProgress = null,
      onError = null,
    } = options;

    const loadPromises = [];
    const results = [];
    let completed = 0;

    // 分批并发加载
    for (let i = 0; i < imageUrls.length; i += concurrency) {
      const batch = imageUrls.slice(i, i + concurrency);

      const batchPromises = batch.map(async (url, index) => {
        try {
          const startTime = performance.now();
          const image = await this.loadAndCacheImage(url, { timeout });
          const loadTime = performance.now() - startTime;

          // 更新性能指标
          this.updatePerformanceMetrics(loadTime);

          completed++;
          onProgress?.({ completed, total: imageUrls.length, url });

          return { success: true, url, image, loadTime };
        } catch (error) {
          completed++;
          onError?.({ url, error, completed, total: imageUrls.length });
          return { success: false, url, error: error.message };
        }
      });

      const batchResults = await Promise.all(batchPromises);
      results.push(...batchResults);
    }

    return {
      results,
      summary: {
        total: imageUrls.length,
        successful: results.filter((r) => r.success).length,
        failed: results.filter((r) => !r.success).length,
        cacheHitRate: this.performanceMetrics.cacheHits / this.performanceMetrics.imageLoads,
        averageLoadTime: this.performanceMetrics.averageLoadTime,
      },
    };
  }

  /**
   * 加载并缓存图像
   * @param {String} url 图像URL
   * @param {Object} options 选项
   */
  async loadAndCacheImage(url, options = {}) {
    // 检查缓存
    if (this.imageCache.has(url)) {
      this.performanceMetrics.cacheHits++;
      return this.imageCache.get(url);
    }

    // 加载新图像
    const image = await this.loadImage(url, options);

    // 添加到缓存
    this.addToCache(url, image);

    return image;
  }

  /**
   * 开始批量操作模式
   */
  startBatch() {
    this.isBatchMode = true;
    this.batchOperations = [];
  }

  /**
   * 批量更换多个固定图层的图像
   * @param {Array} operations 操作数组 [{layerType, imageUrl, options}, ...]
   */
  async batchChangeFixedImages(operations) {
    const operationResults = [];

    if (this.isBatchMode) {
      // 如果在批量模式下，只收集操作
      this.batchOperations.push(
        ...operations.map((op) => ({
          type: "changeFixed",
          ...op,
        }))
      );
      return { queued: operations.length };
    }

    // 立即执行模式
    for (const operation of operations) {
      try {
        const result = await this.canvasManager.changeFixedImage(operation.imageUrl, {
          targetLayerType: operation.layerType,
          ...operation.options,
        });
        operationResults.push({ success: true, ...result, operation });
      } catch (error) {
        operationResults.push({
          success: false,
          error: error.message,
          operation,
        });
      }
    }

    return {
      results: operationResults,
      summary: this.getSummary(operationResults),
    };
  }

  /**
   * 批量向多个图层添加图像
   * @param {Array} operations 操作数组 [{layerId, imageUrl, position, options}, ...]
   */
  async batchAddImagesToLayers(operations) {
    const operationResults = [];

    if (this.isBatchMode) {
      this.batchOperations.push(
        ...operations.map((op) => ({
          type: "addToLayer",
          ...op,
        }))
      );
      return { queued: operations.length };
    }

    // 并发执行以提高性能
    const concurrentOperations = operations.map(async (operation) => {
      try {
        const result = await this.canvasManager.addImageToLayer(
          operation.imageUrl,
          operation.layerId,
          {
            position: operation.position,
            ...operation.options,
          }
        );
        return { success: true, ...result, operation };
      } catch (error) {
        return {
          success: false,
          error: error.message,
          operation,
        };
      }
    });

    const concurrentResults = await Promise.all(concurrentOperations);
    return {
      results: concurrentResults,
      summary: this.getSummary(concurrentResults),
    };
  }

  /**
   * 执行批量操作
   */
  async executeBatch() {
    if (!this.isBatchMode || this.batchOperations.length === 0) {
      return { message: "No batch operations to execute" };
    }

    const results = [];
    const startTime = performance.now();

    // 按类型分组操作以优化执行
    const groupedOps = this.groupOperationsByType(this.batchOperations);

    // 执行分组操作
    for (const [type, ops] of Object.entries(groupedOps)) {
      try {
        let typeResults;

        switch (type) {
          case "changeFixed":
            typeResults = await this.batchChangeFixedImages(ops);
            break;
          case "addToLayer":
            typeResults = await this.batchAddImagesToLayers(ops);
            break;
          default:
            console.warn(`Unknown operation type: ${type}`);
            continue;
        }

        if (typeResults.results) {
          results.push(...typeResults.results);
        }
      } catch (error) {
        console.error(`Batch execution failed for type ${type}:`, error);
        // 继续执行其他类型的操作
      }
    }

    const executionTime = performance.now() - startTime;

    // 清理批量状态
    this.isBatchMode = false;
    this.batchOperations = [];

    return {
      results,
      summary: {
        ...this.getSummary(results),
        executionTime,
        operationsPerSecond: results.length / (executionTime / 1000),
      },
    };
  }

  /**
   * 创建图像替换模板
   * @param {String} templateName 模板名称
   * @param {Array} operations 操作定义
   */
  createTemplate(templateName, operations) {
    if (!this.templates) {
      this.templates = new Map();
    }

    this.templates.set(templateName, {
      name: templateName,
      operations,
      createdAt: new Date(),
      usageCount: 0,
    });
  }

  /**
   * 应用模板
   * @param {String} templateName 模板名称
   * @param {Object} variables 变量替换映射
   */
  async applyTemplate(templateName, variables = {}) {
    const template = this.templates?.get(templateName);
    if (!template) {
      throw new Error(`Template "${templateName}" not found`);
    }

    // 替换模板中的变量
    const operations = this.replaceTemplateVariables(template.operations, variables);

    // 执行操作
    const result = await this.batchAddImagesToLayers(operations);

    // 更新使用计数
    template.usageCount++;

    return result;
  }

  /**
   * 智能图像优化
   * @param {String} imageUrl 图像URL
   * @param {Object} targetSpecs 目标规格 {width, height, quality}
   */
  async optimizeImage(imageUrl, targetSpecs) {
    const image = await this.loadAndCacheImage(imageUrl);

    // 检查是否需要优化
    const currentSpecs = {
      width: image.width,
      height: image.height,
    };

    if (this.shouldOptimize(currentSpecs, targetSpecs)) {
      return this.performImageOptimization(image, targetSpecs);
    }

    return image;
  }

  /**
   * 清理缓存
   * @param {String} strategy 清理策略 'lru', 'size', 'all'
   */
  clearCache(strategy = "lru") {
    switch (strategy) {
      case "all":
        this.imageCache.clear();
        break;
      case "size":
        if (this.imageCache.size > this.maxCacheSize) {
          const excess = this.imageCache.size - this.maxCacheSize;
          const keys = Array.from(this.imageCache.keys());
          for (let i = 0; i < excess; i++) {
            this.imageCache.delete(keys[i]);
          }
        }
        break;
      case "lru":
        // 实现 LRU 清理逻辑
        this.implementLRUCleanup();
        break;
    }
  }

  // === 私有方法 ===

  loadImage(url, options = {}) {
    return new Promise((resolve, reject) => {
      const timeout = setTimeout(() => {
        reject(new Error(`Image load timeout: ${url}`));
      }, options.timeout || 10000);

      fabric.Image.fromURL(
        url,
        (img) => {
          clearTimeout(timeout);
          if (!img || !img.getElement()) {
            reject(new Error("Invalid image"));
            return;
          }
          resolve(img);
        },
        { crossOrigin: "anonymous" }
      );
    });
  }

  addToCache(url, image) {
    // 检查缓存大小限制
    if (this.imageCache.size >= this.maxCacheSize) {
      this.clearCache("size");
    }

    // 添加时间戳用于 LRU
    const cacheEntry = {
      image,
      lastUsed: Date.now(),
      usageCount: 1,
    };

    this.imageCache.set(url, cacheEntry);
  }

  updatePerformanceMetrics(loadTime) {
    this.performanceMetrics.imageLoads++;
    this.performanceMetrics.totalLoadTime += loadTime;
    this.performanceMetrics.averageLoadTime =
      this.performanceMetrics.totalLoadTime / this.performanceMetrics.imageLoads;
  }

  getSummary(results) {
    return {
      total: results.length,
      successful: results.filter((r) => r.success).length,
      failed: results.filter((r) => !r.success).length,
      successRate: results.filter((r) => r.success).length / results.length,
    };
  }

  groupOperationsByType(operations) {
    return operations.reduce((groups, op) => {
      const type = op.type;
      if (!groups[type]) groups[type] = [];
      groups[type].push(op);
      return groups;
    }, {});
  }

  replaceTemplateVariables(operations, variables) {
    return operations.map((op) => {
      const newOp = { ...op };

      // 替换字符串中的变量 {{variable}}
      Object.keys(newOp).forEach((key) => {
        if (typeof newOp[key] === "string") {
          newOp[key] = newOp[key].replace(/\{\{(\w+)\}\}/g, (match, varName) => {
            return variables[varName] || match;
          });
        }
      });

      return newOp;
    });
  }

  shouldOptimize(current, target) {
    const sizeThreshold = 0.8; // 80% 的阈值
    return (
      current.width > target.width * (1 / sizeThreshold) ||
      current.height > target.height * (1 / sizeThreshold)
    );
  }

  performImageOptimization(image, targetSpecs) {
    // 实现图像优化逻辑
    // 这里可以集成图像压缩、尺寸调整等功能
    return image; // 简化实现
  }

  implementLRUCleanup() {
    if (this.imageCache.size <= this.maxCacheSize) return;

    // 按最后使用时间排序，移除最久未使用的
    const entries = Array.from(this.imageCache.entries()).sort(
      (a, b) => a[1].lastUsed - b[1].lastUsed
    );

    const toRemove = entries.slice(0, this.imageCache.size - this.maxCacheSize);
    toRemove.forEach(([key]) => this.imageCache.delete(key));
  }

  // 获取性能报告
  getPerformanceReport() {
    return {
      ...this.performanceMetrics,
      cacheSize: this.imageCache.size,
      maxCacheSize: this.maxCacheSize,
      cacheUtilization: this.imageCache.size / this.maxCacheSize,
      recommendations: this.generatePerformanceRecommendations(),
    };
  }

  generatePerformanceRecommendations() {
    const recommendations = [];

    if (this.performanceMetrics.cacheHits / this.performanceMetrics.imageLoads < 0.3) {
      recommendations.push("考虑增加缓存大小以提高缓存命中率");
    }

    if (this.performanceMetrics.averageLoadTime > 2000) {
      recommendations.push("图像加载时间较长，考虑图像优化或CDN");
    }

    return recommendations;
  }
}

/**
 * 图像工具集
 * 提供常用的图像处理和图层操作功能
 */
export const ImageUtils = {
  // 基础图像加载
  loadImage,
  safeLoadImage,

  // 图层操作
  createImageLayer,
  changeFixedImage,
  addImageToLayer,

  // 文件上传处理
  uploadImageAndCreateLayer,
  uploadImageAndChangeFixedLayer,
  uploadImageAndAddToLayer,
  uploadImageAndAddToLayerSimple,
  batchUploadImagesAndCreateLayers,

  // URL图像处理
  loadImageAndChangeFixedLayer,

  /**
   * 快速创建图像图层 (别名)
   * @param {File} file - 图像文件
   * @param {Object} layerManager - 图层管理器
   * @param {Object} canvas - 画布实例
   * @param {Object} toolManager - 工具管理器
   * @returns {Promise<string>} 图层ID
   */
  quickCreateImageLayer: (file, layerManager, canvas, toolManager) => {
    return uploadImageAndCreateLayer({
      file,
      layerManager,
      canvas,
      toolManager,
    });
  },

  /**
   * 快速更改固定图层图像 (别名)
   * @param {File} file - 图像文件
   * @param {string} layerId - 图层ID
   * @param {Object} layerManager - 图层管理器
   * @returns {Promise<string>} 新图像ID
   */
  quickChangeFixedImage: (file, layerId, layerManager) => {
    return uploadImageAndChangeFixedLayer({ file, layerId, layerManager });
  },

  /**
   * 快速添加图像到图层 (别名)
   * @param {File} file - 图像文件
   * @param {Object} layerManager - 图层管理器
   * @param {Object} toolManager - 工具管理器
   * @param {string} targetLayerId - 目标图层ID (可选)
   * @returns {Promise<Object>} 执行结果
   */
  quickAddImageToLayer: (file, layerManager, toolManager, targetLayerId = null) => {
    return uploadImageAndAddToLayerSimple({
      file,
      layerManager,
      toolManager,
      targetLayerId,
    });
  },
};

/**
 * 栅格化画布对象为图像
 * 参考fabric.brushes.js中的convertToImg方法，考虑画布变换参数
 * @param {Object} options - 配置选项
 * @param {fabric.Canvas} options.canvas - fabric画布实例
 * @param {Array} options.objects - 要栅格化的对象数组
 * @param {Object} options.bounds - 边界框 {left, top, width, height} (可选)
 * @param {boolean} options.trimWhitespace - 是否裁剪空白区域，默认true
 * @param {number} options.trimPadding - 裁剪时保留的空白边距，默认10像素
 * @param {number} options.quality - 图像质量 0-1，默认1
 * @param {string} options.format - 图像格式 'png'|'jpeg'，默认'png'
 * @returns {Promise<fabric.Image>} 栅格化后的图像对象
 */
export function rasterizeCanvasObjects(options = {}) {
  return new Promise((resolve, reject) => {
    try {
      const {
        canvas,
        objects = [],
        bounds = null,
        trimWhitespace = true,
        trimPadding = 10,
        quality = 1,
        format = "png",
      } = options;

      if (!canvas || !Array.isArray(objects)) {
        reject(new Error("无效的参数：需要画布实例和对象数组"));
        return;
      }

      if (objects.length === 0) {
        reject(new Error("没有对象可栅格化"));
        return;
      }

      // 使用改进的栅格化方法
      _rasterizeUsingCanvasCopy(canvas, objects, {
        trimWhitespace,
        trimPadding,
        quality,
        format,
      })
        .then(resolve)
        .catch(reject);
    } catch (error) {
      console.error("栅格化对象失败:", error);
      reject(error);
    }
  });
}

/**
 * 使用画布复制方式进行栅格化（参考convertToImg实现）
 * @param {fabric.Canvas} canvas - fabric画布实例
 * @param {Array} objects - 要栅格化的对象数组
 * @param {Object} options - 配置选项
 * @returns {Promise<fabric.Image>} 栅格化后的图像对象
 * @private
 */
function _rasterizeUsingCanvasCopy(canvas, objects, options = {}) {
  return new Promise((resolve, reject) => {
    try {
      const { trimWhitespace = true, trimPadding = 10, quality = 1, format = "png" } = options;

      // 保存原始状态
      const originalObjects = canvas.getObjects();
      const originalViewportTransform = [...canvas.viewportTransform];
      const originalZoom = canvas.getZoom();

      // 临时隐藏其他对象，只显示要栅格化的对象
      const objectsToHide = originalObjects.filter((obj) => !objects.includes(obj));

      // 隐藏不需要的对象
      objectsToHide.forEach((obj) => {
        obj._originalVisible = obj.visible;
        obj.set("visible", false);
      });

      // 确保要栅格化的对象可见
      objects.forEach((obj) => {
        obj._originalVisible = obj.visible;
        obj.set("visible", true);
      });

      // 重新渲染画布以应用可见性变化
      canvas.renderAll();

      // 等待一帧确保渲染完成
      requestAnimationFrame(() => {
        try {
          // 获取画布的像素比例
          const pixelRatio = canvas.getRetinaScaling();

          // 复制画布元素（这会保持所有变换状态）
          const copiedCanvas = fabric.util.copyCanvasElement(canvas.lowerCanvasEl);

          let finalCanvas = copiedCanvas;
          let trimOffset = { x: 0, y: 0 };

          // 裁剪空白区域（如果需要，支持padding）
          if (trimWhitespace) {
            const trimResult = _trimCanvas(copiedCanvas, trimPadding);
            if (trimResult) {
              finalCanvas = trimResult.canvas;
              trimOffset = { x: trimResult.offset.x, y: trimResult.offset.y };
            }
          }

          // 创建fabric图像对象
          const fabricImage = new fabric.Image(finalCanvas);

          if (!fabricImage) {
            throw new Error("创建fabric图像失败");
          }

          // 获取画布变换参数
          const pointerX = canvas.viewportTransform[4];
          const pointerY = canvas.viewportTransform[5];
          const zoom = canvas.getZoom();

          // 计算最终位置（参考convertToImg的实现）
          const finalLeft = (trimOffset.x / pixelRatio - pointerX) / zoom;
          const finalTop = (trimOffset.y / pixelRatio - pointerY) / zoom;
          const finalScaleX = 1 / pixelRatio / zoom;
          const finalScaleY = 1 / pixelRatio / zoom;

          // 设置图像属性
          fabricImage.set({
            id: generateId("rasterized_image_"),
            left: finalLeft,
            top: finalTop,
            scaleX: finalScaleX,
            scaleY: finalScaleY,
            selectable: true,
            hasControls: true,
            hasBorders: true,
            custom: {
              type: "rasterized",
              originalObjects: objects.map((obj) => obj.id).filter(Boolean),
              rasterizedAt: new Date().toISOString(),
              trimPadding: trimPadding,
            },
          });

          fabricImage.setCoords();

          // 恢复对象的原始可见性
          _restoreObjectVisibility(originalObjects);

          // 重新渲染画布
          canvas.renderAll();

          resolve(fabricImage);
        } catch (error) {
          // 确保恢复对象状态
          _restoreObjectVisibility(originalObjects);
          canvas.renderAll();
          reject(error);
        }
      });
    } catch (error) {
      reject(error);
    }
  });
}

/**
 * 恢复对象的原始可见性状态
 * @param {Array} objects - 对象数组
 * @private
 */
function _restoreObjectVisibility(objects) {
  objects.forEach((obj) => {
    if (Object.prototype.hasOwnProperty.call(obj, "_originalVisible")) {
      obj.set("visible", obj._originalVisible);
      delete obj._originalVisible;
    }
  });
}

/**
 * 备用栅格化方法：使用toDataURL方式
 * 当画布复制方法不可用时的备选方案
 * @param {fabric.Canvas} canvas - fabric画布实例
 * @param {Array} objects - 要栅格化的对象数组
 * @param {Object} options - 配置选项
 * @returns {Promise<fabric.Image>} 栅格化后的图像对象
 * @private
 */
function _rasterizeUsingDataURL(canvas, objects, options = {}) {
  return new Promise((resolve, reject) => {
    try {
      const { quality = 1, format = "png" } = options;

      // 保存原始状态
      const originalObjects = canvas.getObjects();

      // 临时移除其他对象
      const objectsToRemove = originalObjects.filter((obj) => !objects.includes(obj));
      objectsToRemove.forEach((obj) => {
        canvas.remove(obj);
      });

      // 重新渲染画布
      canvas.renderAll();

      // 获取画布数据URL
      const dataUrl = canvas.toDataURL({
        format: format,
        quality: quality,
        multiplier: canvas.getRetinaScaling(),
      });

      // 恢复原始对象
      objectsToRemove.forEach((obj) => {
        canvas.add(obj);
      });

      // 恢复原始渲染顺序
      canvas._objects = [...originalObjects];
      canvas.renderAll();

      // 创建fabric图像
      fabric.Image.fromURL(
        dataUrl,
        (fabricImage) => {
          if (!fabricImage) {
            reject(new Error("创建fabric图像失败"));
            return;
          }

          fabricImage.set({
            id: generateId("rasterized_image_"),
            left: 0,
            top: 0,
            selectable: true,
            hasControls: true,
            hasBorders: true,
            custom: {
              type: "rasterized",
              originalObjects: objects.map((obj) => obj.id).filter(Boolean),
              rasterizedAt: new Date().toISOString(),
            },
          });

          fabricImage.setCoords();
          resolve(fabricImage);
        },
        { crossOrigin: "anonymous" }
      );
    } catch (error) {
      reject(error);
    }
  });
}

/**
 * 栅格化画布对象为图像（兼容版本）
 * 自动选择最适合的栅格化方法
 * @param {Object} options - 配置选项
 * @returns {Promise<fabric.Image>} 栅格化后的图像对象
 */
export function rasterizeCanvasObjectsCompat(options = {}) {
  const { canvas, objects = [] } = options;

  // 检测是否支持copyCanvasElement
  if (fabric.util.copyCanvasElement && canvas.lowerCanvasEl) {
    // 使用画布复制方法（推荐）
    return rasterizeCanvasObjects(options);
  } else {
    // 使用备用方法
    console.warn("使用备用栅格化方法：toDataURL");
    return _rasterizeUsingDataURL(canvas, objects, options);
  }
}

/**
 * 高级栅格化方法：支持更多选项和优化
 * @param {Object} options - 配置选项
 * @param {fabric.Canvas} options.canvas - fabric画布实例
 * @param {Array} options.objects - 要栅格化的对象数组
 * @param {Object} options.bounds - 边界框 {left, top, width, height} (可选)
 * @param {boolean} options.trimWhitespace - 是否裁剪空白区域，默认true
 * @param {number} options.quality - 图像质量 0-1，默认1
 * @param {string} options.format - 图像格式 'png'|'jpeg'，默认'png'
 * @param {boolean} options.preserveObjectState - 是否保持对象状态，默认true
 * @param {number} options.multiplier - 输出倍数，默认使用画布的retina缩放
 * @param {boolean} options.useBackgroundColor - 是否使用画布背景色，默认false
 * @returns {Promise<fabric.Image>} 栅格化后的图像对象
 */
export function rasterizeCanvasObjectsAdvanced(options = {}) {
  return new Promise(async (resolve, reject) => {
    try {
      const {
        canvas,
        objects = [],
        bounds = null,
        trimWhitespace = true,
        quality = 1,
        format = "png",
        preserveObjectState = true,
        multiplier = null,
        useBackgroundColor = false,
      } = options;

      if (!canvas || !Array.isArray(objects)) {
        reject(new Error("无效的参数：需要画布实例和对象数组"));
        return;
      }

      if (objects.length === 0) {
        reject(new Error("没有对象可栅格化"));
        return;
      }

      // 检测画布状态
      const hasTransform =
        canvas.getZoom() !== 1 ||
        canvas.viewportTransform[4] !== 0 ||
        canvas.viewportTransform[5] !== 0;

      let result;

      if (hasTransform && fabric.util.copyCanvasElement) {
        // 有变换时使用画布复制方法
        console.log("🎯 检测到画布变换，使用画布复制方法");
        result = await _rasterizeUsingCanvasCopy(canvas, objects, {
          trimWhitespace,
          quality,
          format,
        });
      } else {
        // 无变换时可以使用更灵活的方法
        console.log("📐 画布无变换，使用标准栅格化方法");
        result = await _rasterizeUsingDataURL(canvas, objects, {
          quality,
          format,
        });
      }

      resolve(result);
    } catch (error) {
      console.error("高级栅格化失败:", error);
      reject(error);
    }
  });
}

/**
 * 计算多个对象的边界框
 * @param {Array} objects - 对象数组
 * @returns {Object} 边界框 {left, top, width, height}
 * @private
 */
function _calculateObjectsBounds(objects) {
  if (!objects || objects.length === 0) {
    return null;
  }

  let minX = Infinity;
  let minY = Infinity;
  let maxX = -Infinity;
  let maxY = -Infinity;

  objects.forEach((obj) => {
    if (!obj || typeof obj.getBoundingRect !== "function") {
      return;
    }

    const bounds = obj.getBoundingRect();
    minX = Math.min(minX, bounds.left);
    minY = Math.min(minY, bounds.top);
    maxX = Math.max(maxX, bounds.left + bounds.width);
    maxY = Math.max(maxY, bounds.top + bounds.height);
  });

  if (minX === Infinity || minY === Infinity) {
    return null;
  }

  return {
    left: minX,
    top: minY,
    width: maxX - minX,
    height: maxY - minY,
  };
}

/**
 * 裁剪画布空白区域（支持保留边距）
 * 参考fabric.util.trimCanvas方法，添加padding支持
 * @param {HTMLCanvasElement} canvas - 要裁剪的画布
 * @param {number} padding - 保留的边距像素，默认0
 * @returns {Object|null} 裁剪结果 {canvas: 新画布, offset: {x, y}}
 * @private
 */
function _trimCanvas(canvas, padding = 0) {
  try {
    const ctx = canvas.getContext("2d");
    const w = canvas.width;
    const h = canvas.height;
    const imageData = ctx.getImageData(0, 0, w, h);
    const pixels = imageData.data;

    let minX = w;
    let minY = h;
    let maxX = 0;
    let maxY = 0;
    let hasContent = false;

    // 扫描像素找到有内容的区域
    for (let y = 0; y < h; y++) {
      for (let x = 0; x < w; x++) {
        const alpha = pixels[(y * w + x) * 4 + 3];
        if (alpha > 0) {
          hasContent = true;
          minX = Math.min(minX, x);
          minY = Math.min(minY, y);
          maxX = Math.max(maxX, x);
          maxY = Math.max(maxY, y);
        }
      }
    }

    if (!hasContent) {
      return null;
    }

    // 应用padding，确保不超出原始画布边界
    const paddedMinX = Math.max(0, minX - padding);
    const paddedMinY = Math.max(0, minY - padding);
    const paddedMaxX = Math.min(w - 1, maxX + padding);
    const paddedMaxY = Math.min(h - 1, maxY + padding);

    const trimWidth = paddedMaxX - paddedMinX + 1;
    const trimHeight = paddedMaxY - paddedMinY + 1;

    // 创建裁剪后的画布
    const trimmedCanvas = document.createElement("canvas");
    const trimmedCtx = trimmedCanvas.getContext("2d");

    trimmedCanvas.width = trimWidth;
    trimmedCanvas.height = trimHeight;

    // 复制裁剪区域（包含padding）
    const trimmedImageData = ctx.getImageData(paddedMinX, paddedMinY, trimWidth, trimHeight);
    trimmedCtx.putImageData(trimmedImageData, 0, 0);

    return {
      canvas: trimmedCanvas,
      offset: { x: paddedMinX, y: paddedMinY },
    };
  } catch (error) {
    console.error("裁剪画布失败:", error);
    return null;
  }
}

/**
 * 栅格化图层对象（简化版接口）
 * @param {Object} options - 配置选项
 * @param {fabric.Canvas} options.canvas - fabric画布实例
 * @param {Object} options.layer - 图层对象
 * @param {boolean} options.includeChildren - 是否包含子图层，默认true
 * @returns {Promise<fabric.Image>} 栅格化后的图像对象
 */
export function rasterizeLayer(options = {}) {
  const { canvas, layer, includeChildren = true } = options;

  if (!canvas || !layer) {
    return Promise.reject(new Error("缺少必要参数：画布或图层"));
  }

  // 收集图层的所有对象
  const objects = [];

  if (layer.fabricObjects && Array.isArray(layer.fabricObjects)) {
    objects.push(...layer.fabricObjects.filter(Boolean));
  }

  // 如果包含子图层
  if (includeChildren && layer.children && Array.isArray(layer.children)) {
    const collectChildObjects = (childLayer) => {
      if (childLayer.fabricObjects && Array.isArray(childLayer.fabricObjects)) {
        objects.push(...childLayer.fabricObjects.filter(Boolean));
      }
      if (childLayer.children && Array.isArray(childLayer.children)) {
        childLayer.children.forEach(collectChildObjects);
      }
    };

    layer.children.forEach(collectChildObjects);
  }

  if (objects.length === 0) {
    return Promise.reject(new Error("图层没有可栅格化的对象"));
  }

  // 调用通用栅格化方法
  return rasterizeCanvasObjects({
    canvas,
    objects,
    trimWhitespace: true,
    quality: 1,
    format: "png",
  });
}

/**
 * 批量栅格化多个图层
 * @param {Object} options - 配置选项
 * @param {fabric.Canvas} options.canvas - fabric画布实例
 * @param {Array} options.layers - 图层数组
 * @param {function} options.onProgress - 进度回调
 * @returns {Promise<Array>} 栅格化结果数组
 */
export async function batchRasterizeLayers(options = {}) {
  const { canvas, layers = [], onProgress = null } = options;

  if (!canvas || !Array.isArray(layers)) {
    throw new Error("缺少必要参数：画布或图层数组");
  }

  const results = [];
  const total = layers.length;

  for (let i = 0; i < layers.length; i++) {
    const layer = layers[i];

    try {
      onProgress?.({ current: i + 1, total, layer, status: "processing" });

      const rasterizedImage = await rasterizeLayer({
        canvas,
        layer,
        includeChildren: true,
      });

      results.push({
        success: true,
        layer,
        image: rasterizedImage,
        layerId: layer.id,
      });

      onProgress?.({ current: i + 1, total, layer, status: "success" });
    } catch (error) {
      console.error(`栅格化图层失败: ${layer.name || layer.id}`, error);

      results.push({
        success: false,
        layer,
        error: error.message,
        layerId: layer.id,
      });

      onProgress?.({
        current: i + 1,
        total,
        layer,
        status: "error",
        error: error.message,
      });
    }
  }

  return results;
}

/**
 * 智能栅格化：根据对象类型和画布状态自动选择最佳方法
 * @param {Object} options - 配置选项
 * @param {fabric.Canvas} options.canvas - fabric画布实例
 * @param {Array} options.objects - 要栅格化的对象数组
 * @param {Object} options.strategy - 策略配置
 * @returns {Promise<fabric.Image>} 栅格化后的图像对象
 */
export function smartRasterize(options = {}) {
  const { canvas, objects = [], strategy = {} } = options;

  // 分析对象和画布状态
  const analysis = _analyzeRasterizationContext(canvas, objects);

  // 选择最佳策略
  const selectedStrategy = _selectOptimalStrategy(analysis, strategy);

  console.log(`🧠 智能栅格化策略: ${selectedStrategy.method}`, {
    reason: selectedStrategy.reason,
    analysis: analysis,
  });

  // 执行对应的栅格化方法
  switch (selectedStrategy.method) {
    case "canvasCopy":
      return rasterizeCanvasObjects({
        canvas,
        objects,
        ...selectedStrategy.options,
      });

    case "dataURL":
      return _rasterizeUsingDataURL(canvas, objects, selectedStrategy.options);

    case "advanced":
      return rasterizeCanvasObjectsAdvanced({
        canvas,
        objects,
        ...selectedStrategy.options,
      });

    default:
      return rasterizeCanvasObjects({ canvas, objects, ...options });
  }
}

/**
 * 分析栅格化上下文
 * @param {fabric.Canvas} canvas - 画布实例
 * @param {Array} objects - 对象数组
 * @returns {Object} 分析结果
 * @private
 */
function _analyzeRasterizationContext(canvas, objects) {
  const zoom = canvas.getZoom();
  const viewportTransform = canvas.viewportTransform;
  const hasTransform = zoom !== 1 || viewportTransform[4] !== 0 || viewportTransform[5] !== 0;

  // 分析对象类型分布
  const objectTypes = objects.reduce((acc, obj) => {
    const type = obj.type || "unknown";
    acc[type] = (acc[type] || 0) + 1;
    return acc;
  }, {});

  // 估算复杂度
  const complexity = _estimateRenderingComplexity(objects);

  // 计算画布利用率
  const canvasArea = canvas.width * canvas.height;
  const objectsBounds = _calculateObjectsBounds(objects);
  const objectsArea = objectsBounds ? objectsBounds.width * objectsBounds.height : 0;
  const utilization = objectsArea / canvasArea;

  return {
    hasTransform,
    zoom,
    objectCount: objects.length,
    objectTypes,
    complexity,
    utilization,
    canvasSize: { width: canvas.width, height: canvas.height },
    objectsBounds,
    supportsCanvasCopy: !!(fabric.util.copyCanvasElement && canvas.lowerCanvasEl),
  };
}

/**
 * 选择最优策略
 * @param {Object} analysis - 分析结果
 * @param {Object} userStrategy - 用户指定策略
 * @returns {Object} 选择的策略
 * @private
 */
function _selectOptimalStrategy(analysis, userStrategy = {}) {
  // 用户指定策略优先
  if (userStrategy.force) {
    return {
      method: userStrategy.force,
      reason: "用户强制指定",
      options: userStrategy.options || {},
    };
  }

  // 画布变换场景
  if (analysis.hasTransform && analysis.supportsCanvasCopy) {
    return {
      method: "canvasCopy",
      reason: "画布有变换，使用画布复制方法保持变换状态",
      options: { trimWhitespace: true },
    };
  }

  // 高复杂度场景
  if (analysis.complexity > 0.8) {
    return {
      method: "advanced",
      reason: "高复杂度渲染，使用高级栅格化方法",
      options: {
        preserveObjectState: true,
        useBackgroundColor: analysis.utilization > 0.5,
      },
    };
  }

  // 大量对象场景
  if (analysis.objectCount > 50) {
    return {
      method: "dataURL",
      reason: "大量对象，使用dataURL方法优化性能",
      options: { quality: 0.9 },
    };
  }

  // 低利用率场景（空白较多）
  if (analysis.utilization < 0.1) {
    return {
      method: "canvasCopy",
      reason: "空白区域较多，使用画布复制+裁剪优化",
      options: { trimWhitespace: true },
    };
  }

  // 默认策略
  return {
    method: "canvasCopy",
    reason: "标准场景，使用画布复制方法",
    options: { trimWhitespace: true },
  };
}

/**
 * 估算渲染复杂度
 * @param {Array} objects - 对象数组
 * @returns {number} 复杂度分数 0-1
 * @private
 */
function _estimateRenderingComplexity(objects) {
  let complexity = 0;
  let totalWeight = 0;

  objects.forEach((obj) => {
    let objectComplexity = 0;
    let weight = 1;

    // 基于对象类型的复杂度
    switch (obj.type) {
      case "path":
        objectComplexity = 0.8;
        weight = 2;
        break;
      case "group":
        objectComplexity = 0.7;
        weight = obj.getObjects?.()?.length || 3;
        break;
      case "text":
      case "i-text":
      case "textbox":
        objectComplexity = 0.6;
        weight = (obj.text?.length || 10) / 50;
        break;
      case "image":
        objectComplexity = 0.4;
        break;
      case "rect":
      case "circle":
      case "ellipse":
        objectComplexity = 0.2;
        break;
      default:
        objectComplexity = 0.3;
    }

    // 考虑变换复杂度
    if (obj.angle && obj.angle !== 0) objectComplexity += 0.1;
    if (obj.scaleX !== 1 || obj.scaleY !== 1) objectComplexity += 0.1;
    if (obj.skewX || obj.skewY) objectComplexity += 0.2;

    // 考虑样式复杂度
    if (obj.shadow) objectComplexity += 0.2;
    if (obj.stroke) objectComplexity += 0.1;
    if (obj.strokeDashArray?.length) objectComplexity += 0.1;

    complexity += objectComplexity * weight;
    totalWeight += weight;
  });

  return totalWeight > 0 ? Math.min(complexity / totalWeight, 1) : 0;
}

/**
 * 栅格化工具集合
 * 提供不同场景下的栅格化方法选择
 */
export const RasterizeUtils = {
  // 基础栅格化
  rasterizeCanvasObjects,
  rasterizeLayer,
  batchRasterizeLayers,

  // 智能栅格化
  smartRasterize,

  // 兼容性栅格化
  rasterizeCanvasObjectsCompat,
  rasterizeCanvasObjectsAdvanced,

  // 策略栅格化
  fastRasterize: (canvas, objects) => {
    return _rasterizeUsingDataURL(canvas, objects, { quality: 0.8 });
  },

  highQualityRasterize: (canvas, objects) => {
    return rasterizeCanvasObjectsAdvanced({
      canvas,
      objects,
      quality: 1,
      trimWhitespace: true,
      preserveObjectState: true,
    });
  },

  compactRasterize: (canvas, objects) => {
    return rasterizeCanvasObjects({
      canvas,
      objects,
      trimWhitespace: true,
      format: "jpeg",
      quality: 0.9,
    });
  },

  // 分析工具
  analyzeRasterizationContext: _analyzeRasterizationContext,
  estimateComplexity: _estimateRenderingComplexity,
  calculateObjectsBounds: _calculateObjectsBounds,

  /**
   * 获取推荐的栅格化方法
   * @param {fabric.Canvas} canvas - 画布实例
   * @param {Array} objects - 对象数组
   * @returns {Object} 推荐结果
   */
  getRecommendation: (canvas, objects) => {
    const analysis = _analyzeRasterizationContext(canvas, objects);
    const strategy = _selectOptimalStrategy(analysis);

    return {
      recommendedMethod: strategy.method,
      reason: strategy.reason,
      analysis: analysis,
      alternatives: _getAlternativeMethods(analysis),
    };
  },
};

/**
 * 获取备选方法
 * @param {Object} analysis - 分析结果
 * @returns {Array} 备选方法列表
 * @private
 */
function _getAlternativeMethods(analysis) {
  const alternatives = [];

  if (analysis.supportsCanvasCopy) {
    alternatives.push({
      method: "canvasCopy",
      pros: ["保持变换状态", "高质量输出", "自动裁剪"],
      cons: ["可能较慢"],
      suitable: "有画布变换或需要高质量输出",
    });
  }

  alternatives.push({
    method: "dataURL",
    pros: ["性能较好", "兼容性强", "处理大量对象"],
    cons: ["不保持变换", "可能有质量损失"],
    suitable: "大量对象或性能优先",
  });

  alternatives.push({
    method: "advanced",
    pros: ["智能优化", "完整功能", "自适应策略"],
    cons: ["复杂度较高"],
    suitable: "复杂场景或需要最佳效果",
  });

  return alternatives;
}

/** * 图像模式处理函数
 * 根据不同的图像模式调整图像大小和位置
 * @param {Object} params - 参数对象
 * @param {string} params.imageMode - 图像模式
 * @param {fabric.Image} params.newImage - 新图像对象
 * @param {number} params.canvasWidth - 画布宽度
 * @param {number} params.canvasHeight - 画布高度
 */
export const imageModeHandler = ({ imageMode, newImage, canvasWidth, canvasHeight }) => {
  switch (imageMode) {
    case "stretch":
      // 拉伸模式 - 填充整个画布
      newImage.scaleToWidth(canvasWidth);
      newImage.scaleToHeight(canvasHeight);
      break;
    case "tile":
      // 平铺模式 - 保持原始大小
      newImage.scaleX = 1;
      newImage.scaleY = 1;
      break;
    case "stretchTile":
      // 拉伸平铺模式 - 填充整个画布，但保持宽高比
      newImage.scaleToWidth(canvasWidth);
      newImage.scaleToHeight(canvasHeight);
      break;
    case "stretchTileCrop":
      // 拉伸平铺并裁剪模式 - 填充整个画布，可能
      // 会裁剪图像以适应画布
      newImage.scaleToWidth(canvasWidth);
      newImage.scaleToHeight(canvasHeight);
      // 这里可以添加裁剪逻辑，如果需要的话
      // 例如使用fabric.Image.clipPath来裁剪图像
      break;
    case "contains": {
      // 图片缩放后要保证最长边能完全显示在画布内 // 既要考虑画布的宽高比，也要考虑图像的宽高比 // 包含模式 - 保证图像在画布内完整显示
      const canvasAspect = canvasWidth / canvasHeight;
      const imageAspect = newImage.width / newImage.height;
      // 保证图像在画布内完整显示 - 既要考虑画布的宽高比，也要考虑图像的宽高比
      // 图片缩放后要保证最长边能完全显示在画布内
      if (imageAspect > canvasAspect) {
        // 图像更宽
        newImage.scaleToWidth(canvasWidth);
      } else {
        // 图像更高
        newImage.scaleToHeight(canvasHeight);
      }
      break;
    }
  }
};


/**
 * 调整图像大小
 * @param {string} base64 - 原始base64字符串
 * @param {number} width - 目标宽度
 * @param {number} height - 目标高度
 * @returns {Promise<string>} 处理后的base64字符串
*/
export const resizeImage = async (base64, width, height) => {
  return new Promise((resolve, reject) => {
    const img = new Image();
    img.src = base64;
    img.onload = () => {
      const canvas = document.createElement("canvas");
      canvas.width = width;
      canvas.height = height;
      const ctx = canvas.getContext("2d");
      ctx.drawImage(img, 0, 0, width, height);
      resolve(canvas.toDataURL());
    };
    img.onerror = reject;
  });
};