/**
 * CPU版本的液化管理器
 * 修复版本 - 解决三角形网格失真问题，优化持续按压效果
 */
export class LiquifyCPUManager {
  constructor(options = {}) {
    this.config = {
      gridSize: options.gridSize || 16, // 稍微增大网格提高性能
      maxStrength: options.maxStrength || 200, // 适度降低最大强度
      smoothingIterations: options.smoothingIterations || 1, // 增加平滑处理
      relaxFactor: options.relaxFactor || 0.1, // 适度松弛
    };

    this.params = {
      size: 80, // 增大默认尺寸
      pressure: 0.8, // 增大默认压力
      distortion: 0,
      power: 0.8, // 增大默认动力
    };

    this.modes = {
      PUSH: "push",
      CLOCKWISE: "clockwise",
      COUNTERCLOCKWISE: "counterclockwise",
      PINCH: "pinch",
      EXPAND: "expand",
      CRYSTAL: "crystal",
      EDGE: "edge",
      RECONSTRUCT: "reconstruct",
    };

    this.currentMode = this.modes.PUSH;
    this.originalImageData = null;
    this.currentImageData = null;
    this.mesh = null;
    this.initialized = false;
    this.canvas = document.createElement("canvas");
    this.ctx = this.canvas.getContext("2d");
    this.deformHistory = [];

    // 性能优化相关
    this.lastUpdateTime = 0;
    this.updateThrottle = 16; // 限制更新频率约60fps
    this.isProcessing = false;

    // 鼠标位置跟踪（用于推拉模式）
    this.initialMouseX = 0; // 初始点击位置X
    this.initialMouseY = 0; // 初始点击位置Y
    this.currentMouseX = 0; // 当前鼠标位置X
    this.currentMouseY = 0; // 当前鼠标位置Y
    this.lastMouseX = 0;
    this.lastMouseY = 0;
    this.mouseMovementX = 0;
    this.mouseMovementY = 0;
    this.isFirstApply = true; // 标记是否是首次应用
    this.isDragging = false; // 标记是否正在拖拽
    this.dragDistance = 0; // 拖拽距离
    this.dragAngle = 0; // 拖拽角度

    // 新增：持续按压相关状态
    this.pressStartTime = 0; // 按压开始时间
    this.pressDuration = 0; // 按压持续时间
    this.accumulatedRotation = 0; // 累积旋转角度（用于顺时针/逆时针）
    this.accumulatedScale = 0; // 累积缩放量（用于捏合/展开）
    this.lastApplyTime = 0; // 上次应用时间
    this.continuousApplyInterval = 50; // 持续应用间隔（毫秒）
    this.isHolding = false; // 是否正在持续按压
  }

  initialize(imageSource) {
    try {
      if (imageSource instanceof ImageData) {
        this.originalImageData = new ImageData(
          new Uint8ClampedArray(imageSource.data),
          imageSource.width,
          imageSource.height
        );
      } else if (imageSource instanceof HTMLImageElement) {
        this.canvas.width = imageSource.width;
        this.canvas.height = imageSource.height;
        this.ctx.drawImage(imageSource, 0, 0);
        this.originalImageData = this.ctx.getImageData(0, 0, imageSource.width, imageSource.height);
      } else {
        throw new Error("不支持的图像类型");
      }

      this.currentImageData = new ImageData(
        new Uint8ClampedArray(this.originalImageData.data),
        this.originalImageData.width,
        this.originalImageData.height
      );

      this._initMesh(this.originalImageData.width, this.originalImageData.height);
      this.initialized = true;
      return true;
    } catch (error) {
      console.error("液化管理器初始化失败:", error);
      return false;
    }
  }

  _initMesh(width, height) {
    const gridSize = this.config.gridSize;
    const cols = Math.ceil(width / gridSize);
    const rows = Math.ceil(height / gridSize);

    this.mesh = {
      cols,
      rows,
      gridSize,
      width,
      height,
      originalPoints: [],
      deformedPoints: [],
    };

    for (let y = 0; y <= rows; y++) {
      for (let x = 0; x <= cols; x++) {
        const point = { x: x * gridSize, y: y * gridSize };
        this.mesh.originalPoints.push({ ...point });
        this.mesh.deformedPoints.push({ ...point });
      }
    }
  }

  setMode(mode) {
    if (Object.values(this.modes).includes(mode)) {
      this.currentMode = mode;
      return true;
    }
    return false;
  }

  setParam(param, value) {
    if (param in this.params) {
      this.params[param] = value;
      return true;
    }
    return false;
  }

  getParams() {
    return { ...this.params };
  }

  resetParams() {
    this.params = {
      size: 80, // 增大默认尺寸
      pressure: 0.8, // 增大默认压力
      distortion: 0,
      power: 0.8, // 增大默认动力
    };
  }

  /**
   * 开始液化操作（记录初始点）
   * @param {Number} x 初始X坐标
   * @param {Number} y 初始Y坐标
   */
  startDeformation(x, y) {
    this.initialMouseX = x;
    this.initialMouseY = y;
    this.currentMouseX = x;
    this.currentMouseY = y;
    this.lastMouseX = x;
    this.lastMouseY = y;
    this.isDragging = true;
    this.isFirstApply = true;
    this.dragDistance = 0;
    this.dragAngle = 0;

    // 新增：初始化持续按压状态
    this.pressStartTime = Date.now();
    this.pressDuration = 0;
    this.accumulatedRotation = 0;
    this.accumulatedScale = 0;
    this.lastApplyTime = this.pressStartTime;
    this.isHolding = true;

    // 启动持续效果定时器（对于所有模式都支持持续按压）
    this.startContinuousEffect();

    console.log(`开始液化操作，初始点: (${x}, ${y})`);
  }

  /**
   * 结束液化操作
   */
  endDeformation() {
    this.isDragging = false;
    this.isFirstApply = true;
    this.dragDistance = 0;
    this.dragAngle = 0;

    // 新增：重置持续按压状态
    this.isHolding = false;
    this.pressStartTime = 0;
    this.pressDuration = 0;
    this.accumulatedRotation = 0;
    this.accumulatedScale = 0;
    this.lastApplyTime = 0;

    // 停止持续效果定时器
    this.stopContinuousEffect();

    console.log("结束液化操作");
  }

  // 新增：启动持续效果
  startContinuousEffect() {
    this.stopContinuousEffect(); // 先停止已有的定时器

    this.continuousTimer = setInterval(() => {
      if (this.isHolding && this.initialized) {
        // 更新持续时间
        this.pressDuration = Date.now() - this.pressStartTime;

        // 所有模式都支持持续效果
        this.applyContinuousDeformation();
      }
    }, this.continuousApplyInterval);
  }

  // 新增：停止持续效果
  stopContinuousEffect() {
    if (this.continuousTimer) {
      clearInterval(this.continuousTimer);
      this.continuousTimer = null;
    }
  }

  /**
   * 稳定的旋转衰减函数 - 确保内圈快外圈慢，保持纹理连续性
   * @param {number} t 归一化距离 (0-1)
   * @returns {number} 衰减因子 (0-1)
   */
  _stableRotationFalloff(t) {
    if (t >= 1.0) return 0;
    if (t <= 0) return 1;

    // 使用反向二次函数：内圈(t=0)时值为1，外圈(t=1)时值为0
    // 这确保了内圈旋转最快，外圈旋转最慢
    const inverseFalloff = 1 - t;

    // 使用平滑的二次衰减，确保内圈效果强，外圈效果弱
    const quadraticFalloff = inverseFalloff * inverseFalloff;

    // 添加轻微的线性分量，确保过渡平滑
    const linearFalloff = inverseFalloff;

    // 混合二次和线性衰减，70%二次衰减 + 30%线性衰减
    return quadraticFalloff * 0.7 + linearFalloff * 0.3;
  }

  /**
   * 基于test-liquify-enhanced.html的旋转算法 - 像素级实现
   * @param {number} centerX 旋转中心X坐标
   * @param {number} centerY 旋转中心Y坐标
   * @param {number} radius 影响半径
   * @param {number} strength 强度
   * @param {boolean} isClockwise 是否顺时针旋转
   */
  _applyEnhancedRotationDeformation(centerX, centerY, radius, strength, isClockwise) {
    if (!this.currentImageData) return;

    const data = this.currentImageData.data;
    const width = this.currentImageData.width;
    const height = this.currentImageData.height;
    const tempData = new Uint8ClampedArray(data);

    // 计算旋转角度 - 基于test-liquify-enhanced.html的算法
    const { pressure, power } = this.params;
    const timeFactor = Math.min(this.pressDuration / 1000, 5.0);
    const baseRotationSpeed = 0.02; // 使用与测试文件相同的速度
    const rotationAngle =
      (isClockwise ? 1 : -1) * baseRotationSpeed * pressure * power * (1.0 + timeFactor * 0.5);

    // 累积旋转角度 - 关键：这确保了持续旋转效果
    this.accumulatedRotation += rotationAngle;

    const processRadius = Math.min(radius, Math.min(width, height) / 2);
    const minX = Math.max(0, Math.floor(centerX - processRadius));
    const maxX = Math.min(width, Math.ceil(centerX + processRadius));
    const minY = Math.max(0, Math.floor(centerY - processRadius));
    const maxY = Math.min(height, Math.ceil(centerY + processRadius));

    // 遍历影响区域内的每个像素
    for (let y = minY; y < maxY; y++) {
      for (let x = minX; x < maxX; x++) {
        const dx = x - centerX;
        const dy = y - centerY;
        const distance = Math.sqrt(dx * dx + dy * dy);

        if (distance < processRadius && distance > 0.1) {
          // 距离衰减：内圈快，外圈慢 - 与测试文件算法一致
          const normalizedDistance = distance / processRadius;
          const falloff = Math.pow(1 - normalizedDistance, 2); // 二次衰减

          // 计算旋转后的源位置 - 关键算法
          const angle = Math.atan2(dy, dx);
          const newAngle = angle + this.accumulatedRotation * falloff;

          const sourceX = centerX + Math.cos(newAngle) * distance;
          const sourceY = centerY + Math.sin(newAngle) * distance;

          // 双线性插值采样 - 确保像素连续性
          const color = this._bilinearSample(tempData, width, height, sourceX, sourceY);

          if (color) {
            const targetIdx = (y * width + x) * 4;
            data[targetIdx] = color[0];
            data[targetIdx + 1] = color[1];
            data[targetIdx + 2] = color[2];
            data[targetIdx + 3] = color[3];
          }
        }
      }
    }

    return true;
  }

  /**
   * 基于test-liquify-enhanced.html的捏合/展开算法
   * @param {number} centerX 中心X坐标
   * @param {number} centerY 中心Y坐标
   * @param {number} radius 影响半径
   * @param {number} strength 强度
   * @param {boolean} isPinch 是否为捏合模式
   */
  _applyEnhancedPinchDeformation(centerX, centerY, radius, strength, isPinch) {
    if (!this.currentImageData) return;

    const data = this.currentImageData.data;
    const width = this.currentImageData.width;
    const height = this.currentImageData.height;
    const tempData = new Uint8ClampedArray(data);

    // 计算时间相关的缩放因子 - 基于test-liquify-enhanced.html
    const timeFactor = Math.min(this.pressDuration / 1000, 3.0);
    const baseScaleFactor = isPinch ? -0.01 : 0.01;
    const scaleFactor = baseScaleFactor * (1.0 + timeFactor * 0.5);

    this.accumulatedScale += scaleFactor;

    const processRadius = Math.min(radius, Math.min(width, height) / 2);
    const minX = Math.max(0, Math.floor(centerX - processRadius));
    const maxX = Math.min(width, Math.ceil(centerX + processRadius));
    const minY = Math.max(0, Math.floor(centerY - processRadius));
    const maxY = Math.min(height, Math.ceil(centerY + processRadius));

    for (let y = minY; y < maxY; y++) {
      for (let x = minX; x < maxX; x++) {
        const dx = x - centerX;
        const dy = y - centerY;
        const distance = Math.sqrt(dx * dx + dy * dy);

        if (distance < processRadius && distance > 0.1) {
          const normalizedDistance = distance / processRadius;
          const falloff = 1 - normalizedDistance * normalizedDistance;

          // 计算缩放后的位置
          const scale = 1 + this.accumulatedScale * falloff;
          const sourceX = centerX + dx * scale;
          const sourceY = centerY + dy * scale;

          // 双线性插值采样
          const color = this._bilinearSample(tempData, width, height, sourceX, sourceY);

          if (color) {
            const targetIdx = (y * width + x) * 4;
            data[targetIdx] = color[0];
            data[targetIdx + 1] = color[1];
            data[targetIdx + 2] = color[2];
            data[targetIdx + 3] = color[3];
          }
        }
      }
    }

    return true;
  }

  /**
   * 基于test-liquify-enhanced.html的推拉算法
   * @param {number} centerX 中心X坐标
   * @param {number} centerY 中心Y坐标
   * @param {number} radius 影响半径
   * @param {number} strength 强度
   */
  _applyEnhancedPushDeformation(centerX, centerY, radius, strength) {
    if (!this.currentImageData) return;

    const data = this.currentImageData.data;
    const width = this.currentImageData.width;
    const height = this.currentImageData.height;
    const tempData = new Uint8ClampedArray(data);

    // 计算推拉方向
    const deltaX = this.currentMouseX - this.initialMouseX;
    const deltaY = this.currentMouseY - this.initialMouseY;
    const dragLength = Math.sqrt(deltaX * deltaX + deltaY * deltaY);

    const processRadius = Math.min(radius, Math.min(width, height) / 2);
    const minX = Math.max(0, Math.floor(centerX - processRadius));
    const maxX = Math.min(width, Math.ceil(centerX + processRadius));
    const minY = Math.max(0, Math.floor(centerY - processRadius));
    const maxY = Math.min(height, Math.ceil(centerY + processRadius));

    if (dragLength === 0) {
      // 如果没有拖拽，在持续按压时执行基础的外推效果
      if (this.isHolding) {
        const timeFactor = Math.min(this.pressDuration / 1000, 2.0);
        const pushStrength = strength * timeFactor * 0.3;

        for (let y = minY; y < maxY; y++) {
          for (let x = minX; x < maxX; x++) {
            const dx = x - centerX;
            const dy = y - centerY;
            const distance = Math.sqrt(dx * dx + dy * dy);

            if (distance < processRadius && distance > 0.1) {
              const normalizedDistance = distance / processRadius;
              const falloff = 1 - normalizedDistance * normalizedDistance;
              const factor = falloff * pushStrength;

              // 径向外推效果
              const pushX = (dx / distance) * factor;
              const pushY = (dy / distance) * factor;

              const sourceX = x - pushX;
              const sourceY = y - pushY;

              const color = this._bilinearSample(tempData, width, height, sourceX, sourceY);

              if (color) {
                const targetIdx = (y * width + x) * 4;
                data[targetIdx] = color[0];
                data[targetIdx + 1] = color[1];
                data[targetIdx + 2] = color[2];
                data[targetIdx + 3] = color[3];
              }
            }
          }
        }
      }
      return true;
    }

    // 有拖拽时的推拉效果
    const dirX = deltaX / dragLength;
    const dirY = deltaY / dragLength;

    for (let y = minY; y < maxY; y++) {
      for (let x = minX; x < maxX; x++) {
        const dx = x - centerX;
        const dy = y - centerY;
        const distance = Math.sqrt(dx * dx + dy * dy);

        if (distance < processRadius && distance > 0.1) {
          const normalizedDistance = distance / processRadius;
          const falloff = 1 - normalizedDistance * normalizedDistance;
          const factor = falloff * strength;

          const offsetX = dirX * factor * Math.min(dragLength * 0.3, 15);
          const offsetY = dirY * factor * Math.min(dragLength * 0.3, 15);

          const sourceX = x - offsetX;
          const sourceY = y - offsetY;

          const color = this._bilinearSample(tempData, width, height, sourceX, sourceY);

          if (color) {
            const targetIdx = (y * width + x) * 4;
            data[targetIdx] = color[0];
            data[targetIdx + 1] = color[1];
            data[targetIdx + 2] = color[2];
            data[targetIdx + 3] = color[3];
          }
        }
      }
    }

    return true;
  }

  /**
   * 优化的持续变形效果处理 - 使用增强算法
   */
  applyContinuousDeformation() {
    if (!this.isHolding || !this.initialized || !this.currentImageData) return;

    const { size, pressure, power } = this.params;
    const mode = this.currentMode;
    const radius = size;
    const x = this.initialMouseX;
    const y = this.initialMouseY;
    const strength = pressure * power;

    // 根据模式使用相应的增强算法
    switch (mode) {
      case this.modes.CLOCKWISE:
        this._applyEnhancedRotationDeformation(x, y, radius, strength, true);
        break;

      case this.modes.COUNTERCLOCKWISE:
        this._applyEnhancedRotationDeformation(x, y, radius, strength, false);
        break;

      case this.modes.PINCH:
        this._applyEnhancedPinchDeformation(x, y, radius, strength, true);
        break;

      case this.modes.EXPAND:
        this._applyEnhancedPinchDeformation(x, y, radius, strength, false);
        break;

      case this.modes.PUSH:
        this._applyEnhancedPushDeformation(x, y, radius, strength);
        break;

      default: {
        // 对于其他模式，使用原有的网格算法
        if (!this.mesh) return;

        const baseStrength = (pressure * power * this.config.maxStrength) / 100;
        const timeFactor = Math.min(this.pressDuration / 1000, 4.0);
        const finalStrength = baseStrength * (1.0 + timeFactor * 0.5);

        this._applyDeformation(x, y, radius, finalStrength, mode, this.params.distortion);

        if (this.config.smoothingIterations > 0) {
          this._lightSmoothing();
        }

        return this._applyMeshToImage();
      }
    }

    // 对于像素算法，直接返回当前图像数据
    return this.currentImageData;
  }

  /**
   * 应用液化变形 - 主要入口，集成增强算法
   */
  // applyDeformation(x, y) {
  //   if (!this.initialized || !this.originalImageData) {
  //     console.warn("液化管理器未初始化或缺少必要数据");
  //     return this.currentImageData;
  //   }

  //   // 更新鼠标位置
  //   this.currentMouseX = x;
  //   this.currentMouseY = y;

  //   // 计算拖拽参数
  //   const deltaX = this.currentMouseX - this.initialMouseX;
  //   const deltaY = this.currentMouseY - this.initialMouseY;
  //   this.dragDistance = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
  //   this.dragAngle = Math.atan2(deltaY, deltaX);

  //   // 获取当前参数
  //   const { size, pressure, power } = this.params;
  //   const mode = this.currentMode;
  //   const radius = size;
  //   const strength = pressure * power;

  //   // 根据模式选择算法
  //   const pixelModes = [
  //     this.modes.CLOCKWISE,
  //     this.modes.COUNTERCLOCKWISE,
  //     this.modes.PINCH,
  //     this.modes.EXPAND,
  //     this.modes.PUSH,
  //   ];

  //   if (pixelModes.includes(mode)) {
  //     // 使用增强的像素算法
  //     switch (mode) {
  //       case this.modes.CLOCKWISE:
  //         this._applyEnhancedRotationDeformation(x, y, radius, strength, false);
  //         break;
  //       case this.modes.COUNTERCLOCKWISE:
  //         this._applyEnhancedRotationDeformation(x, y, radius, strength, true);
  //         break;
  //       case this.modes.PINCH:
  //         this._applyEnhancedPinchDeformation(x, y, radius, strength, true);
  //         break;
  //       case this.modes.EXPAND:
  //         this._applyEnhancedPinchDeformation(x, y, radius, strength, false);
  //         break;
  //       case this.modes.PUSH:
  //         this._applyEnhancedPushDeformation(x, y, radius, strength);
  //         break;
  //     }

  //     // 更新最后应用时间
  //     this.lastApplyTime = Date.now();
  //     this.isFirstApply = false;

  //     return this.currentImageData;
  //   } else {
  //     // 使用原有的网格算法处理其他模式
  //     if (!this.mesh) {
  //       console.warn("网格未初始化");
  //       return this.currentImageData;
  //     }

  //     const finalStrength = (strength * this.config.maxStrength) / 100;

  //     // 应用变形
  //     this._applyDeformation(
  //       x,
  //       y,
  //       radius,
  //       finalStrength,
  //       mode,
  //       this.params.distortion,
  //     );

  //     // 平滑处理
  //     if (this.config.smoothingIterations > 0) {
  //       this._smoothMesh();
  //     }

  //     // 更新图像数据
  //     const result = this._applyMeshToImage();

  //     // 更新最后应用时间
  //     this.lastApplyTime = Date.now();
  //     this.isFirstApply = false;

  //     return result;
  //   }
  // }

  /**
   * 双线性插值采样 - 用于像素级算法
   * @param {Uint8ClampedArray} data 图像数据
   * @param {number} width 图像宽度
   * @param {number} height 图像高度
   * @param {number} x X坐标
   * @param {number} y Y坐标
   * @returns {Array|null} RGBA颜色值数组或null
   */
  _bilinearSample(data, width, height, x, y) {
    if (x < 0 || x >= width - 1 || y < 0 || y >= height - 1) {
      return null;
    }

    const x1 = Math.floor(x);
    const y1 = Math.floor(y);
    const x2 = x1 + 1;
    const y2 = y1 + 1;

    const fx = x - x1;
    const fy = y - y1;

    const getPixel = (px, py) => {
      const idx = (py * width + px) * 4;
      return [data[idx], data[idx + 1], data[idx + 2], data[idx + 3]];
    };

    const p1 = getPixel(x1, y1);
    const p2 = getPixel(x2, y1);
    const p3 = getPixel(x1, y2);
    const p4 = getPixel(x2, y2);

    return [
      Math.round(
        (1 - fx) * (1 - fy) * p1[0] +
          fx * (1 - fy) * p2[0] +
          (1 - fx) * fy * p3[0] +
          fx * fy * p4[0]
      ),
      Math.round(
        (1 - fx) * (1 - fy) * p1[1] +
          fx * (1 - fy) * p2[1] +
          (1 - fx) * fy * p3[1] +
          fx * fy * p4[1]
      ),
      Math.round(
        (1 - fx) * (1 - fy) * p1[2] +
          fx * (1 - fy) * p2[2] +
          (1 - fx) * fy * p3[2] +
          fx * fy * p4[2]
      ),
      Math.round(
        (1 - fx) * (1 - fy) * p1[3] +
          fx * (1 - fy) * p2[3] +
          (1 - fx) * fy * p3[3] +
          fx * fy * p4[3]
      ),
    ];
  }

  /**
   * 应用变形到网格 - 原有的网格算法（用于其他模式）
   */
  _applyDeformation(x, y, radius, strength, mode, distortion) {
    if (!this.mesh) return;

    const points = this.mesh.deformedPoints;
    const originalPoints = this.mesh.originalPoints;

    // 性能优化：只计算影响范围内的网格点
    const affectedPoints = this._getAffectedPoints(x, y, radius);

    for (const pointInfo of affectedPoints) {
      const { index: i, point, originalPoint, distance } = pointInfo;

      if (distance > 0) {
        // 使用优化的衰减函数
        const normalizedDistance = distance / radius;
        const factor = this._optimizedFalloff(normalizedDistance) * strength;

        switch (mode) {
          case this.modes.CRYSTAL: {
            // 水晶模式
            const dx = point.x - x;
            const dy = point.y - y;
            const crystalAngle = Math.atan2(dy, dx);
            const crystalRadius = normalizedDistance;

            const baseDistortion = Math.max(distortion, 0.3);
            const timeFactor = Math.min(this.pressDuration / 1000, 2.0);
            const timeEnhancedDistortion = baseDistortion * (1.0 + timeFactor * 0.3);

            const wave1 = Math.sin(crystalAngle * 8 + this.pressDuration * 0.005) * 0.6;
            const wave2 = Math.cos(crystalAngle * 12 + this.pressDuration * 0.003) * 0.4;
            const waveAngle = crystalAngle + (wave1 + wave2) * timeEnhancedDistortion;

            const radialMod =
              1 + Math.sin(crystalRadius * Math.PI * 2 + this.pressDuration * 0.002) * 0.3;
            const modDistance = distance * radialMod;

            const crystalX = x + Math.cos(waveAngle) * modDistance;
            const crystalY = y + Math.sin(waveAngle) * modDistance;

            const crystalFactor = factor * timeEnhancedDistortion * 0.7;
            point.x += (crystalX - point.x) * crystalFactor;
            point.y += (crystalY - point.y) * crystalFactor;
            break;
          }

          case this.modes.EDGE: {
            // 边缘模式
            const dx = point.x - x;
            const dy = point.y - y;
            const edgeAngle = Math.atan2(dy, dx);
            const edgeRadius = normalizedDistance;

            const baseEdgeDistortion = Math.max(distortion, 0.5);
            const timeFactor = Math.min(this.pressDuration / 1000, 2.5);
            const timeEnhancedDistortion = baseEdgeDistortion * (1.0 + timeFactor * 0.4);

            const edgeWave =
              Math.sin(edgeRadius * Math.PI * 4 + this.pressDuration * 0.004) *
              Math.cos(edgeAngle * 6 + this.pressDuration * 0.002);
            const perpAngle = edgeAngle + Math.PI / 2;

            const edgeFactor = edgeWave * factor * timeEnhancedDistortion * 0.5;
            const edgeOffsetX = Math.cos(perpAngle) * edgeFactor;
            const edgeOffsetY = Math.sin(perpAngle) * edgeFactor;

            point.x += edgeOffsetX;
            point.y += edgeOffsetY;
            break;
          }

          case this.modes.RECONSTRUCT: {
            // 重建模式
            const restoreFactor = factor * 0.2;
            point.x += (originalPoint.x - point.x) * restoreFactor;
            point.y += (originalPoint.y - point.y) * restoreFactor;
            break;
          }
        }
      }
    }
  }

  /**
   * 获取受影响的网格点（范围优化）
   */
  _getAffectedPoints(centerX, centerY, radius) {
    const { cols, rows, gridSize } = this.mesh;
    const points = this.mesh.deformedPoints;
    const originalPoints = this.mesh.originalPoints;
    const affectedPoints = [];

    // 计算影响范围的网格边界
    const minGridX = Math.max(0, Math.floor((centerX - radius) / gridSize));
    const maxGridX = Math.min(cols, Math.ceil((centerX + radius) / gridSize));
    const minGridY = Math.max(0, Math.floor((centerY - radius) / gridSize));
    const maxGridY = Math.min(rows, Math.ceil((centerY + radius) / gridSize));

    // 只遍历影响范围内的网格点
    for (let gridY = minGridY; gridY <= maxGridY; gridY++) {
      for (let gridX = minGridX; gridX <= maxGridX; gridX++) {
        const index = gridY * (cols + 1) + gridX;
        if (index < points.length) {
          const point = points[index];
          const originalPoint = originalPoints[index];
          const dx = point.x - centerX;
          const dy = point.y - centerY;
          const distance = Math.sqrt(dx * dx + dy * dy);

          // 只包含在影响半径内的点
          if (distance <= radius) {
            affectedPoints.push({
              index,
              point,
              originalPoint,
              distance,
              dx,
              dy,
            });
          }
        }
      }
    }

    return affectedPoints;
  }

  _smoothMesh() {
    const { rows, cols } = this.mesh;
    const points = this.mesh.deformedPoints;
    const tempPoints = points.map((p) => ({ x: p.x, y: p.y }));

    for (let iteration = 0; iteration < this.config.smoothingIterations; iteration++) {
      for (let y = 1; y < rows; y++) {
        for (let x = 1; x < cols; x++) {
          const idx = y * (cols + 1) + x;
          const left = points[y * (cols + 1) + (x - 1)];
          const right = points[y * (cols + 1) + (x + 1)];
          const top = points[(y - 1) * (cols + 1) + x];
          const bottom = points[(y + 1) * (cols + 1) + x];

          const centerX = (left.x + right.x + top.x + bottom.x) / 4;
          const centerY = (left.y + right.y + top.y + bottom.y) / 4;

          const relaxFactor = this.config.relaxFactor;
          tempPoints[idx].x += (centerX - points[idx].x) * relaxFactor;
          tempPoints[idx].y += (centerY - points[idx].y) * relaxFactor;
        }
      }

      for (let i = 0; i < points.length; i++) {
        points[i].x = tempPoints[i].x;
        points[i].y = tempPoints[i].y;
      }
    }
  }

  /**
   * 专门为旋转模式优化的网格平滑
   */
  _lightSmoothing() {
    const { rows, cols } = this.mesh;
    const points = this.mesh.deformedPoints;
    const tempPoints = points.map((p) => ({ x: p.x, y: p.y }));

    // 只进行一次轻微平滑
    for (let y = 1; y < rows; y++) {
      for (let x = 1; x < cols; x++) {
        const idx = y * (cols + 1) + x;
        const left = points[y * (cols + 1) + (x - 1)];
        const right = points[y * (cols + 1) + (x + 1)];
        const top = points[(y - 1) * (cols + 1) + x];
        const bottom = points[(y + 1) * (cols + 1) + x];

        const centerX = (left.x + right.x + top.x + bottom.x) / 4;
        const centerY = (left.y + right.y + top.y + bottom.y) / 4;

        // 使用更小的松弛因子
        const lightRelaxFactor = this.config.relaxFactor * 0.3;
        tempPoints[idx].x += (centerX - points[idx].x) * lightRelaxFactor;
        tempPoints[idx].y += (centerY - points[idx].y) * lightRelaxFactor;
      }
    }

    for (let i = 0; i < points.length; i++) {
      points[i].x = tempPoints[i].x;
      points[i].y = tempPoints[i].y;
    }
  }

  /**
   * 使用更优化的衰减函数
   * @param {number} t 归一化距离 (0-1)
   * @returns {number} 衰减因子 (0-1)
   */
  _optimizedFalloff(t) {
    if (t >= 1.0) return 0;

    // 对于旋转模式，使用专门的衰减函数
    if (
      this.currentMode === this.modes.CLOCKWISE ||
      this.currentMode === this.modes.COUNTERCLOCKWISE
    ) {
      return this._stableRotationFalloff(t); // 修复函数名
    }

    // 其他模式使用原来的衰减函数
    const smoothT = 1 - t;

    // 多项式衰减 + 指数衰减的组合
    const polynomial = smoothT * smoothT * (3 - 2 * smoothT); // 平滑阶梯函数
    const exponential = Math.exp(-t * 2); // 指数衰减

    // 组合两种衰减方式，在不同区域有不同特性
    const weight = Math.cos(t * Math.PI * 0.5); // 权重函数

    return polynomial * weight + exponential * (1 - weight);
  }

  _applyMeshToImage() {
    if (!this.mesh || !this.originalImageData) {
      return this.currentImageData;
    }

    const width = this.originalImageData.width;
    const height = this.originalImageData.height;
    const result = new ImageData(width, height);
    const srcData = this.originalImageData.data;
    const dstData = result.data;

    // 性能优化：使用步长采样减少计算量
    const step = width > 1000 || height > 1000 ? 2 : 1;

    for (let y = 0; y < height; y += step) {
      for (let x = 0; x < width; x += step) {
        const srcPos = this._mapPointBack(x, y);

        if (srcPos.x >= 0 && srcPos.x < width && srcPos.y >= 0 && srcPos.y < height) {
          const color = this._bilinearInterpolate(srcData, width, height, srcPos.x, srcPos.y);

          // 如果使用步长采样，需要填充相邻像素
          for (let dy = 0; dy < step && y + dy < height; dy++) {
            for (let dx = 0; dx < step && x + dx < width; dx++) {
              const dstIdx = ((y + dy) * width + (x + dx)) * 4;
              dstData[dstIdx] = color[0];
              dstData[dstIdx + 1] = color[1];
              dstData[dstIdx + 2] = color[2];
              dstData[dstIdx + 3] = color[3];
            }
          }
        }
      }
    }

    this.currentImageData = result;
    return result;
  }

  // 添加异步处理方法用于大图像
  async applyDeformationAsync(x, y) {
    return new Promise((resolve) => {
      setTimeout(() => {
        const result = this.applyDeformation(x, y);
        resolve(result);
      }, 0);
    });
  }

  // 批量处理方法
  applyDeformationBatch(positions) {
    if (!this.initialized || !this.mesh || positions.length === 0) {
      return this.currentImageData;
    }

    // 对于批量处理，模拟连续的拖拽操作
    if (positions.length > 0) {
      // 使用第一个位置作为初始点
      this.startDeformation(positions[0].x, positions[0].y);

      // 逐个应用每个位置的变形
      positions.forEach((pos, index) => {
        if (index === 0) return; // 跳过第一个，因为已经作为初始点

        // 更新当前位置并应用变形
        this.currentMouseX = pos.x;
        this.currentMouseY = pos.y;

        // 重新计算拖拽参数
        const deltaX = this.currentMouseX - this.initialMouseX;
        const deltaY = this.currentMouseY - this.initialMouseY;
        this.dragDistance = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
        this.dragAngle = Math.atan2(deltaY, deltaX);

        const { size, pressure, distortion, power } = this.params;
        const mode = this.currentMode;
        const radius = size * 0.8;

        // 根据推拉模式和拖拽距离动态调整强度
        let strength;
        if (mode === this.modes.PUSH) {
          const baseStrength = (pressure * power * this.config.maxStrength) / 100;
          const distanceFactor = Math.min(this.dragDistance / radius, 2.0);
          strength = baseStrength * distanceFactor * 0.3; // 批量处理时降低强度
        } else {
          strength = (pressure * power * this.config.maxStrength) / 100;
        }

        this._applyDeformation(pos.x, pos.y, radius, strength, mode, distortion);
      });

      // 结束拖拽操作
      this.endDeformation();
    }

    if (this.config.smoothingIterations > 0) {
      this._smoothMesh();
    }

    return this._applyMeshToImage();
  }

  /**
   * 改进的网格映射算法 - 防止空白区域
   */
  _mapPointBack(x, y) {
    const { cols, rows, gridSize } = this.mesh;
    const gridX = x / gridSize;
    const gridY = y / gridSize;

    const x1 = Math.floor(gridX);
    const y1 = Math.floor(gridY);
    const x2 = Math.min(x1 + 1, cols);
    const y2 = Math.min(y1 + 1, rows);

    const fx = gridX - x1;
    const fy = gridY - y1;

    // 获取四个网格点的变形和原始坐标
    const deformed = [
      this.mesh.deformedPoints[y1 * (cols + 1) + x1],
      this.mesh.deformedPoints[y1 * (cols + 1) + x2],
      this.mesh.deformedPoints[y2 * (cols + 1) + x1],
      this.mesh.deformedPoints[y2 * (cols + 1) + x2],
    ];

    const original = [
      this.mesh.originalPoints[y1 * (cols + 1) + x1],
      this.mesh.originalPoints[y1 * (cols + 1) + x2],
      this.mesh.originalPoints[y2 * (cols + 1) + x1],
      this.mesh.originalPoints[y2 * (cols + 1) + x2],
    ];

    // 双线性插值计算变形后的位置
    const deformedX =
      (1 - fx) * (1 - fy) * deformed[0].x +
      fx * (1 - fy) * deformed[1].x +
      (1 - fx) * fy * deformed[2].x +
      fx * fy * deformed[3].x;
    const deformedY =
      (1 - fx) * (1 - fy) * deformed[0].y +
      fx * (1 - fy) * deformed[1].y +
      (1 - fx) * fy * deformed[2].y +
      fx * fy * deformed[3].y;

    // 计算原始网格位置
    const originalX = x1 * gridSize + fx * gridSize;
    const originalY = y1 * gridSize + fy * gridSize;

    // 计算偏移量并应用反向映射
    const offsetX = deformedX - originalX;
    const offsetY = deformedY - originalY;

    // 限制偏移量，防止过度扭曲
    const maxOffset = gridSize * 0.5;
    const limitedOffsetX = Math.max(-maxOffset, Math.min(maxOffset, offsetX));
    const limitedOffsetY = Math.max(-maxOffset, Math.min(maxOffset, offsetY));

    return {
      x: Math.max(0, Math.min(this.mesh.width - 1, x - limitedOffsetX)),
      y: Math.max(0, Math.min(this.mesh.height - 1, y - limitedOffsetY)),
    };
  }

  _bilinearInterpolate(data, width, height, x, y) {
    const x1 = Math.floor(x);
    const y1 = Math.floor(y);
    const x2 = Math.min(x1 + 1, width - 1);
    const y2 = Math.min(y1 + 1, height - 1);

    const fx = x - x1;
    const fy = y - y1;

    const getPixel = (px, py) => {
      const idx = (py * width + px) * 4;
      return [data[idx], data[idx + 1], data[idx + 2], data[idx + 3]];
    };

    const p1 = getPixel(x1, y1);
    const p2 = getPixel(x2, y1);
    const p3 = getPixel(x1, y2);
    const p4 = getPixel(x2, y2);

    return [
      Math.round(
        (1 - fx) * (1 - fy) * p1[0] +
          fx * (1 - fy) * p2[0] +
          (1 - fx) * fy * p3[0] +
          fx * fy * p4[0]
      ),
      Math.round(
        (1 - fx) * (1 - fy) * p1[1] +
          fx * (1 - fy) * p2[1] +
          (1 - fx) * fy * p3[1] +
          fx * fy * p4[1]
      ),
      Math.round(
        (1 - fx) * (1 - fy) * p1[2] +
          fx * (1 - fy) * p2[2] +
          (1 - fx) * fy * p3[2] +
          fx * fy * p4[2]
      ),
      Math.round(
        (1 - fx) * (1 - fy) * p1[3] +
          fx * (1 - fy) * p2[3] +
          (1 - fx) * fy * p3[3] +
          fx * fy * p4[3]
      ),
    ];
  }

  reset() {
    if (!this.mesh || !this.originalImageData) return false;

    for (let i = 0; i < this.mesh.deformedPoints.length; i++) {
      this.mesh.deformedPoints[i].x = this.mesh.originalPoints[i].x;
      this.mesh.deformedPoints[i].y = this.mesh.originalPoints[i].y;
    }

    this.currentImageData = new ImageData(
      new Uint8ClampedArray(this.originalImageData.data),
      this.originalImageData.width,
      this.originalImageData.height
    );

    // 重置拖拽状态
    this.initialMouseX = 0;
    this.initialMouseY = 0;
    this.currentMouseX = 0;
    this.currentMouseY = 0;
    this.lastMouseX = 0;
    this.lastMouseY = 0;
    this.mouseMovementX = 0;
    this.mouseMovementY = 0;
    this.isFirstApply = true;
    this.isDragging = false;
    this.dragDistance = 0;
    this.dragAngle = 0;

    // 新增：重置持续按压状态
    this.isHolding = false;
    this.pressStartTime = 0;
    this.pressDuration = 0;
    this.accumulatedRotation = 0;
    this.accumulatedScale = 0;
    this.lastApplyTime = 0;

    this.deformHistory = [];
    return true;
  }

  // 新增：获取持续按压状态信息
  getHoldingInfo() {
    return {
      isHolding: this.isHolding,
      pressDuration: this.pressDuration,
      accumulatedRotation: this.accumulatedRotation,
      accumulatedScale: this.accumulatedScale,
      pressStartTime: this.pressStartTime,
    };
  }

  /**
   * 应用液化变形 - 主要的公共接口方法
   * @param {Number} x X坐标
   * @param {Number} y Y坐标
   * @returns {ImageData} 变形后的图像数据
   */
  applyDeformation(x, y) {
    if (!this.initialized || !this.mesh || !this.originalImageData) {
      console.warn("液化管理器未初始化或缺少必要数据");
      return this.currentImageData;
    }

    // 更新鼠标位置
    this.currentMouseX = x;
    this.currentMouseY = y;

    // 计算拖拽参数
    const deltaX = this.currentMouseX - this.initialMouseX;
    const deltaY = this.currentMouseY - this.initialMouseY;
    this.dragDistance = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
    this.dragAngle = Math.atan2(deltaY, deltaX);

    // 获取当前参数
    const { size, pressure, power } = this.params;
    const mode = this.currentMode;
    const radius = size;
    const strength = pressure * power;

    // 根据模式选择算法
    const pixelModes = [
      this.modes.CLOCKWISE,
      this.modes.COUNTERCLOCKWISE,
      this.modes.PINCH,
      this.modes.EXPAND,
      this.modes.PUSH,
    ];

    if (pixelModes.includes(mode)) {
      // 使用增强的像素算法
      switch (mode) {
        case this.modes.CLOCKWISE:
          this._applyEnhancedRotationDeformation(x, y, radius, strength, false);
          break;
        case this.modes.COUNTERCLOCKWISE:
          this._applyEnhancedRotationDeformation(x, y, radius, strength, true);
          break;
        case this.modes.PINCH:
          this._applyEnhancedPinchDeformation(x, y, radius, strength, true);
          break;
        case this.modes.EXPAND:
          this._applyEnhancedPinchDeformation(x, y, radius, strength, false);
          break;
        case this.modes.PUSH:
          this._applyEnhancedPushDeformation(x, y, radius, strength);
          break;
      }

      // 更新最后应用时间
      this.lastApplyTime = Date.now();
      this.isFirstApply = false;

      return this.currentImageData;
    } else {
      // 使用原有的网格算法处理其他模式
      if (!this.mesh) {
        console.warn("网格未初始化");
        return this.currentImageData;
      }

      const finalStrength = (strength * this.config.maxStrength) / 100;

      // 应用变形
      this._applyDeformation(x, y, radius, finalStrength, mode, this.params.distortion);

      // 平滑处理
      if (this.config.smoothingIterations > 0) {
        this._smoothMesh();
      }

      // 更新图像数据
      const result = this._applyMeshToImage();

      // 更新最后应用时间
      this.lastApplyTime = Date.now();
      this.isFirstApply = false;

      return result;
    }
  }

  getCurrentImageData() {
    return this.currentImageData;
  }

  destroy() {
    // 停止持续效果定时器
    this.stopContinuousEffect();

    this.originalImageData = null;
    this.currentImageData = null;
    this.mesh = null;
    this.deformHistory = [];
    this.initialized = false;

    // 清理拖拽状态
    this.initialMouseX = 0;
    this.initialMouseY = 0;
    this.currentMouseX = 0;
    this.currentMouseY = 0;
    this.lastMouseX = 0;
    this.lastMouseY = 0;
    this.mouseMovementX = 0;
    this.mouseMovementY = 0;
    this.isFirstApply = true;
    this.isDragging = false;
    this.dragDistance = 0;
    this.dragAngle = 0;

    // 新增：清理持续按压状态
    this.isHolding = false;
    this.pressStartTime = 0;
    this.pressDuration = 0;
    this.accumulatedRotation = 0;
    this.accumulatedScale = 0;
    this.lastApplyTime = 0;
  }

  /**
   * 释放资源 - 别名方法，与其他管理器保持一致
   */
  dispose() {
    this.destroy();
  }
}