import { useEffect, useState, useRef } from 'react';
import * as cornerstone from '@cornerstonejs/core';
import * as cornerstoneTools from '@cornerstonejs/tools';
import { imageLoader } from '@cornerstonejs/core';
import type { ImageEnhancementSDK } from '@/lib/image-enhancement-sdk';
import { 
  createImageEnhancementSDK, 
  IMAGE_LOADER_SCHEMA 
} from '@/lib/image-enhancement-sdk';

interface UseImageEnhancementSDKOptions {
  sopInstanceUid: string;
  enabled: boolean; // 是否启用SDK（仅在WASM模式下启用）
}

interface UseImageEnhancementSDKReturn {
  sdk: ImageEnhancementSDK | null;
  isSDKReady: boolean;
  isInitializing: boolean;
  error: Error | null;
}

/**
 * 自定义Hook：管理Image Enhancement SDK的生命周期
 * 
 * @param options 配置选项
 * @returns SDK实例和状态
 */
export const useImageEnhancementSDK = (
  options: UseImageEnhancementSDKOptions
): UseImageEnhancementSDKReturn => {
  const { sopInstanceUid, enabled } = options;
  
  const [sdk, setSdk] = useState<ImageEnhancementSDK | null>(null);
  const [isSDKReady, setIsSDKReady] = useState(false);
  const [isInitializing, setIsInitializing] = useState(false);
  const [error, setError] = useState<Error | null>(null);
  
  // 使用ref避免重复初始化
  const initializingRef = useRef(false);
  const sdkRef = useRef<ImageEnhancementSDK | null>(null);

  useEffect(() => {
    // 如果未启用或没有图像ID，直接返回
    if (!enabled || !sopInstanceUid) {
      return;
    }

    // 如果已经在初始化或已初始化，避免重复
    if (initializingRef.current || sdkRef.current) {
      return;
    }

    const initializeSDK = async () => {
      initializingRef.current = true;
      setIsInitializing(true);
      setError(null);

      try {
        console.log('🔧 开始初始化Image Enhancement SDK...');

        // 1. 初始化Cornerstone3D核心库
        if (!cornerstone.cache) {
          await cornerstone.init();
          console.log('✅ Cornerstone3D核心库初始化完成');
        }

        // 2. 初始化Cornerstone Tools
        try {
          await cornerstoneTools.init();
          console.log('✅ Cornerstone Tools初始化完成');
        } catch (err) {
          // Tools可能已经初始化，忽略错误
          console.log('ℹ️ Cornerstone Tools已初始化');
        }

        // 3. 构建配置参数
        const baseUrl = '/dr/api/v1/pub';
        const tifUrl = `${baseUrl}/tif/${sopInstanceUid}-0001.tif`;
        const dcmUrl = `${baseUrl}/dcm/${sopInstanceUid}.dcm`;

        console.log('SDK配置:', {
          sopInstanceUid,
          tifUrl,
          dcmUrl,
        });

        // 4. 创建SDK实例
        const sdkInstance = await createImageEnhancementSDK({
          wasmUrl: '/static/DRENHANCE.js',
          tifUrl,
          dcmUrl,
          tifServiceBaseUrl: baseUrl,
          authorization: '', // 从全局配置获取
          language: 'zh_CN',
          product: 'DROS',
          source: 'Electron',
        });

        // 5. 等待SDK就绪
        await new Promise(resolve => setTimeout(resolve, 500));

        // 6. 注册enhanced loader
        console.log('注册 "enhanced" loader 到 Cornerstone...');
        imageLoader.registerImageLoader(
          IMAGE_LOADER_SCHEMA,
          sdkInstance.imageLoader.getLoaderFunction()
        );
        console.log('✅ Loader注册成功');

        // 7. 保存SDK实例
        sdkRef.current = sdkInstance;
        setSdk(sdkInstance);
        setIsSDKReady(true);
        
        console.log('✅ Image Enhancement SDK初始化完成');
        
      } catch (err) {
        const error = err instanceof Error ? err : new Error('SDK初始化失败');
        console.error('❌ SDK初始化失败:', error);
        setError(error);
      } finally {
        setIsInitializing(false);
        initializingRef.current = false;
      }
    };

    initializeSDK();

    // 清理函数
    return () => {
      if (sdkRef.current) {
        console.log('🧹 清理SDK资源...');
        // SDK清理逻辑（如果有）
        sdkRef.current = null;
        setSdk(null);
        setIsSDKReady(false);
      }
    };
  }, [enabled, sopInstanceUid]);

  return {
    sdk,
    isSDKReady,
    isInitializing,
    error,
  };
};