// ViewportContainer.jsx
import React, { useRef, useEffect, useState, useMemo } from 'react';
import * as cornerstone from '@cornerstonejs/core';
import * as cornerstoneTools from '@cornerstonejs/tools';
import {
  RenderingEngine,
  Enums
} from '@cornerstonejs/core';
import { v4 as uuidv4 } from 'uuid';
import { getDcmImageUrl } from '@/API/bodyPosition';
import { useDispatch } from 'react-redux';
import { addImageToCell, Film, toggleCellSelection } from '@/states/print/printSlice';
import { useAppSelector } from '@/states/store';
// import { dicomWebImageLoader } from '@cornerstonejs/dicom-web-image-loader';

// // 初始化图像加载器（关键：必须提前注册）
// const initImageLoader = () => {
//   // 注册 DICOM Web 加载器（根据实际场景选择加载器）
//   cornerstone.registerImageLoader('dicomweb', dicomWebImageLoader);
//   // 配置加载器（Worker 路径需指向实际文件）
//   dicomWebImageLoader.configure({
//     webWorkerPath: '/cornerstone-workers/',
//     maxWebWorkers: Math.max(navigator.hardwareConcurrency - 1, 1),
//   });
// };

type ViewportContainerProps = {
  imageId: string;
  currentFilm: Film; // 传入当前胶片对象
  indexOfCell: number; // 可选，格子索引
  className?: string;   // 可选
};

const ViewportContainer = ({ imageId, className, currentFilm, indexOfCell }: ViewportContainerProps) => {
  console.log(`ViewportContainer 得到的属性 ：${imageId}`)
  const viewportRef = useRef(null);
  const [renderingEngine, setRenderingEngine] = useState<any>(null);
  const [stackViewport, setStackViewport] = useState<any>(null);
  const [hasImage, setHasImage] = useState<boolean>(false); // 跟踪是否已加载图像
  const [currentImageId, setCurrentImageId] = useState<string | null>(null); // 跟踪当前已加载的图像ID
  // ✅ 用 useMemo 保证 id 只生成一次，包含胶片ID和格子索引确保唯一性
  const viewportId = useMemo(() =>
    `stackViewport-${currentFilm.id}-${indexOfCell}-${uuidv4()}`,
    [currentFilm.id, indexOfCell]
  );
  const dispatch = useDispatch();
  
  // 生成格子的唯一标识符
  const cellId = `${currentFilm.id}-${indexOfCell}`;
  
  // 检查当前格子是否被选中
  const isSelected = useAppSelector(state =>
    state.print.selectedCells.includes(cellId)
  );

  // 监听Redux中当前格子的图像ID状态
  const currentCellImageId = useAppSelector(state => {
    const film = state.print.films.find(f => f.id === currentFilm.id);
    return film?.images[indexOfCell] || null;
  });

  // 统一的图像加载函数，供两种场景使用
  const loadImage = async (targetImageId: string, source: 'props' | 'drag' = 'props'): Promise<boolean> => {
    if (!stackViewport || !targetImageId) return false;
    
    try {
      const fullImageUrl = targetImageId.startsWith('dicomweb:')
        ? targetImageId
        : getDcmImageUrl(targetImageId);
      
      await stackViewport.setStack([fullImageUrl], 0);
      stackViewport.render();
      setHasImage(true);
      
      console.log(`[DcmCell] 图像加载成功 (${source}): ${targetImageId}`);
      return true;
    } catch (error) {
      console.error(`[DcmCell] 图像加载失败 (${source}):`, error);
      setHasImage(false);
      return false;
    }
  };

  // 初始化 Cornerstone 渲染引擎
  useEffect(() => {
    // initImageLoader();

    // 创建胶片特定的渲染引擎实例，确保状态隔离
    const engineId = `renderingEngine-${currentFilm.id}`;
    let engine: RenderingEngine | null = cornerstone.getRenderingEngines()?.find(en => en.id === engineId) || null;
    // 不存在则创建
    if (!engine) {
      engine = new RenderingEngine(engineId);
    }
    setRenderingEngine(engine);

    // 配置 Viewport
    if (viewportRef.current) {
      const viewportInput: cornerstone.Types.PublicViewportInput = {
        viewportId: viewportId,
        type: Enums.ViewportType.STACK, // 序列视图类型
        element: viewportRef.current,
        defaultOptions: {
          background: [0.1, 0.1, 0.1], // 深灰背景
        },
      };

      // 绑定 Viewport 到引擎
      engine.enableElement(viewportInput);

      // 获取 Viewport 实例
      const viewport = engine.getViewport(viewportId);
      setStackViewport(viewport);

      // ========== 添加工具支持 ==========
      const toolGroupId = `PRINT_TOOL_GROUP_${viewportId}`;

      // 创建工具组
      const toolGroup = cornerstoneTools.ToolGroupManager.createToolGroup(toolGroupId);

      if (toolGroup) {
        // 添加基础工具
        toolGroup.addTool(cornerstoneTools.StackScrollTool.toolName);
        toolGroup.addTool(cornerstoneTools.ZoomTool.toolName);
        toolGroup.addTool(cornerstoneTools.PanTool.toolName);
        toolGroup.addTool(cornerstoneTools.WindowLevelTool.toolName);

        // 激活滚轮滚动工具（解决滚轮错误）
        toolGroup.setToolActive(cornerstoneTools.StackScrollTool.toolName, {
          bindings: [{
            mouseButton: cornerstoneTools.Enums.MouseBindings.Wheel
          }]
        });

        // 激活缩放工具（右键）
        toolGroup.setToolActive(cornerstoneTools.ZoomTool.toolName, {
          bindings: [{
            mouseButton: cornerstoneTools.Enums.MouseBindings.Secondary
          }]
        });

        // 激活平移工具（中键）
        toolGroup.setToolActive(cornerstoneTools.PanTool.toolName, {
          bindings: [{
            mouseButton: cornerstoneTools.Enums.MouseBindings.Auxiliary
          }]
        });

        // 其他工具设置为被动状态
        toolGroup.setToolPassive(cornerstoneTools.WindowLevelTool.toolName);

        // 将 viewport 添加到工具组
        toolGroup.addViewport(viewportId, engineId);

        console.log(`[DcmCell] 工具组已创建并配置: ${toolGroupId}`);
      }
    }

    // 组件卸载时清理
    return () => {
      // 销毁工具组
      const toolGroupId = `PRINT_TOOL_GROUP_${viewportId}`;
      const toolGroup = cornerstoneTools.ToolGroupManager.getToolGroup(toolGroupId);
      if (toolGroup) {
        try {
          // 先从工具组中移除 viewport
          toolGroup.removeViewports(`renderingEngine-${currentFilm.id}`, viewportId);
          // 然后销毁工具组
          cornerstoneTools.ToolGroupManager.destroyToolGroup(toolGroupId);
          console.log(`[DcmCell] 工具组已销毁: ${toolGroupId}`);
        } catch (error) {
          console.warn(`[DcmCell] 清理工具组时出错: ${error}`);
        }
      }

      // 清理 viewport
      if (engine) {
        try {
          engine.disableElement(viewportId);
          console.log(`[DcmCell] viewport 已禁用: ${viewportId}`);
        } catch (error) {
          console.warn(`[DcmCell] 禁用 viewport 时出错: ${error}`);
        }
      }
    };
  }, []);

  // 监听 imageId 变化，自动加载图像
  useEffect(() => {
    const loadImageFromProps = async () => {
      if (!stackViewport) return;
      
      // 避免重复加载相同图像
      if (imageId === currentImageId) return;
      
      if (imageId && imageId.trim() !== '') {
        console.log(`[DcmCell] 开始从 props 加载图像: ${imageId}`);
        const success = await loadImage(imageId, 'props');
        if (success) {
          setCurrentImageId(imageId);
        }
      } else {
        // imageId 为空时清空显示
        if (stackViewport) {
          try {
            // 清空 viewport 中的图像堆栈
            // await stackViewport.setStack([]);
            // stackViewport.render();
            renderingEngine.disableElement(viewportId);
          } catch (error) {
            console.warn(`[DcmCell] 清空 viewport 时出错: ${error}`);
          }
        }
        setHasImage(false);
        setCurrentImageId(null);
        console.log(`[DcmCell] imageId 为空，清空显示`);
      }
    };

    loadImageFromProps();
  }, [imageId, stackViewport]);

  // 监听Redux状态变化，当图像被删除时清理viewport
  useEffect(() => {
    if (!stackViewport) return;
    
    // 如果Redux中的图像ID为null，但viewport还有图像，则清理
    if (!currentCellImageId && hasImage) {
      try {
        // 清空viewport的图像栈
        // stackViewport.setStack([]);
        // stackViewport.render();
        renderingEngine.disableElement(viewportId);
        setHasImage(false);
        setCurrentImageId(null);
        console.log(`[DcmCell] 清理viewport: ${cellId} (图像已被删除)`);
      } catch (error) {
        console.warn(`[DcmCell] 清理viewport时出错:`, error);
      }
    }
  }, [currentCellImageId, stackViewport, hasImage, cellId]);

  // 处理拖放事件（核心逻辑）
  const handleDrop = async (e) => {
    e.preventDefault();
    e.stopPropagation();

    // 1. 获取拖拽传递的序列标识
    const seriesInstanceUID = e.dataTransfer.getData('seriesInstanceUID');
    if (!seriesInstanceUID) return;

    try {
      // 2. 获取该序列的所有图像 ID（需替换为实际接口）
      const imageIds = getDcmImageUrl(seriesInstanceUID);
      console.log(`拖拽后要加载图像 是 ${imageIds}`);
      
      // 3. 使用统一的加载函数
      const success = await loadImage(imageIds, 'drag');
      
      if (success) {
        setCurrentImageId(imageIds);
        // 4. 通知到slice
        dispatch(addImageToCell({ index: indexOfCell, imageId: imageIds }));
      }
    } catch (error) {
      console.error('[DcmCell] 拖拽加载图像失败:', error);
    }
  };

  // 处理格子点击事件
  const handleCellClick = (e: React.MouseEvent) => {
    e.stopPropagation();
    dispatch(toggleCellSelection(cellId));
  };

  // 动态样式
  const containerStyle = {
    width: '100%',
    height: '600px',
    border: isSelected ? '3px solid #0066cc' : '2px dashed #666',
    borderRadius: '8px',
    position: 'relative' as const,
    cursor: 'pointer',
    backgroundColor: isSelected ? 'rgba(0, 102, 204, 0.1)' : 'transparent',
    boxShadow: isSelected ? '0 0 10px rgba(0, 102, 204, 0.3)' : 'none',
    transition: 'all 0.2s ease-in-out'
  };

  return (
    <div
      className="viewport-container"
      onClick={handleCellClick}
      onDragOver={(e) => {
        e.preventDefault(); // 允许放置
        e.dataTransfer.dropEffect = 'copy';
      }}
      onDrop={handleDrop}
      style={containerStyle}
    >
      {/* Cornerstone 渲染挂载点 */}
      <div ref={viewportRef} style={{ width: '100%', height: '100%' }} />

      {/* 拖拽提示文字 - 基于Redux状态判断是否显示 */}
      {!currentCellImageId && !hasImage && (
        <div style={{
          position: 'absolute',
          top: '50%',
          left: '50%',
          transform: 'translate(-50%, -50%)',
          color: '#999',
          pointerEvents: 'none' // 防止遮挡鼠标事件
        }}>
          拖拽序列到此处显示
        </div>
      )}
    </div>
  );
};

export default ViewportContainer;