// src/features/imageAnnotation/services/AnnotationManager.ts
// 全局注释管理器 - 负责监听Cornerstone事件并管理注释的保存/加载

import { eventTarget, getRenderingEngines } from '@cornerstonejs/core';
import { EVENTS } from '@cornerstonejs/core';
import { annotation as corAnnotation, Enums } from '@cornerstonejs/tools';
import { AnnotationSerializer } from './AnnotationSerializer';
import { AnnotationValidator } from './AnnotationValidator';
import { annotationAPI } from '../../../API/annotation';
import { extractSopInstanceUid } from '../../../utils/dicomUtils';
import type { AnnotationData, AnnotationEventType } from '../types/annotation';
import { IRenderingEngine, IStackViewport } from '@cornerstonejs/core/dist/esm/types';

export class AnnotationManager {
  private eventListenersRegistered: boolean = false;
  private activeImageId: string | null = null;
  private serializer: AnnotationSerializer;
  private validator: AnnotationValidator;
  private pendingChanges: Map<string, string> = new Map();
  private saveTimeout: NodeJS.Timeout | null = null;
  private isLoading: boolean = false;

  constructor() {
    this.serializer = new AnnotationSerializer();
    this.validator = new AnnotationValidator();
  }

  async initialize(): Promise<void> {
    console.log('【annotationmanager】🔧 AnnotationManager 初始化中...');

    // 注册全局事件监听器
    this.registerGlobalEventListeners();

    console.log('【annotationmanager】🎧 全局注释事件监听器已设置');
  }

  async cleanup(): Promise<void> {
    console.log('【annotationmanager】🧹 AnnotationManager 清理中...');

    // 取消待处理的保存操作
    if (this.saveTimeout) {
      clearTimeout(this.saveTimeout);
      this.saveTimeout = null;
    }

    // 移除全局事件监听器
    this.unregisterGlobalEventListeners();

    console.log('【annotationmanager】✅ AnnotationManager 清理完成');
  }

  // ============ 事件监听器注册 ============

  private registerGlobalEventListeners(): void {
    if (this.eventListenersRegistered) {
      console.warn('【annotationmanager】事件监听器已注册，跳过重复注册');
      return;
    }

    console.log('【annotationmanager】注册事件监听器...');

    // 图像加载完成事件
    eventTarget.addEventListener(
      EVENTS.IMAGE_LOADED,
      this.handleImageLoadCompleted
    );

    // 图像渲染完成事件
    eventTarget.addEventListener(
      EVENTS.IMAGE_RENDERED,
      this.handleImageRendered
    );

    // 注释完成事件
    eventTarget.addEventListener(
      Enums.Events.ANNOTATION_COMPLETED,
      this.handleAnnotationCompleted
    );

    // 注释添加事件
    eventTarget.addEventListener(
      Enums.Events.ANNOTATION_ADDED,
      this.handleAnnotationAdded
    );

    // 注释修改事件
    eventTarget.addEventListener(
      Enums.Events.ANNOTATION_MODIFIED,
      this.handleAnnotationModified
    );

    // 注释删除事件
    eventTarget.addEventListener(
      Enums.Events.ANNOTATION_REMOVED,
      this.handleAnnotationRemoved
    );

    this.eventListenersRegistered = true;
    console.log('【annotationmanager】✅ 事件监听器注册完成');
  }

  private unregisterGlobalEventListeners(): void {
    if (!this.eventListenersRegistered) {
      return;
    }

    console.log('【annotationmanager】移除事件监听器...');

    eventTarget.removeEventListener(
      EVENTS.IMAGE_LOADED,
      this.handleImageLoadCompleted
    );

    eventTarget.removeEventListener(
      EVENTS.IMAGE_RENDERED,
      this.handleImageRendered
    );

    eventTarget.removeEventListener(
      Enums.Events.ANNOTATION_COMPLETED,
      this.handleAnnotationCompleted
    );

    eventTarget.removeEventListener(
      Enums.Events.ANNOTATION_ADDED,
      this.handleAnnotationCompleted
    );

    eventTarget.removeEventListener(
      Enums.Events.ANNOTATION_MODIFIED,
      this.handleAnnotationModified
    );

    eventTarget.removeEventListener(
      Enums.Events.ANNOTATION_REMOVED,
      this.handleAnnotationRemoved
    );

    this.eventListenersRegistered = false;
    console.log('【annotationmanager】✅ 事件监听器移除完成');
  }

  // ============ 事件处理方法 ============

  private handleImageLoadCompleted = (evt: any) => {
    const rawImageId = evt.detail.image?.imageId || evt.detail.imageId;
    console.log(`【annotationmanager】📸 原始图像ID: ${rawImageId}`);

    // 提取SOP Instance UID
    const sopInstanceUid = extractSopInstanceUid(rawImageId);
    if (!sopInstanceUid) {
      console.warn('【annotationmanager】无法从图像URL中提取SOP Instance UID:', rawImageId);
      return;
    }

    console.log(`【annotationmanager】📸 提取的SOP Instance UID: ${sopInstanceUid}`);

    // 使用提取的SOP Instance UID加载注释
    this.loadAnnotationsForImage(sopInstanceUid);
  };

  private handleImageRendered = (evt: any) => {
    const { viewportId } = evt.detail;
    console.log(`【annotationmanager】🎨 图像渲染完成: ${viewportId}`);

    // TODO: 确保注释正确显示
  };

  private handleAnnotationCompleted = (evt: any) => {
    console.log('🎯 监听到注释完成事件:', evt);
    console.log('📋 事件详情:', evt.detail);

    const { annotation, toolName } = evt.detail;
    console.log(`【annotationmanager】✏️ 注释创建完成: ${toolName}`);

    // 确保有活动的图像ID
    if (!this.activeImageId) {
      console.warn('【annotationmanager】没有活动的图像ID，跳过注释保存');
      return;
    }

    // 实现注释保存逻辑
    this.saveAnnotation(annotation, toolName);
  };

  private handleAnnotationAdded = (evt: any) => {
    console.log('【annotationmanager】🎯 监听到注释添加事件:', evt);
    console.log('【annotationmanager】📋 事件详情:', evt.detail);

    const { annotation } = evt.detail;
    const toolName = annotation.metadata?.toolName;
    console.log(`【annotationmanager】➕ 注释添加: ${toolName}`);

    // 确保有活动的图像ID
    if (!this.activeImageId) {
      console.warn('【annotationmanager】没有活动的图像ID，跳过注释保存');
      return;
    }

    // 实现注释保存逻辑
    this.saveAnnotation(annotation, toolName);
  };


  private handleAnnotationModified = (evt: any) => {
    console.log('🎯 监听到注释修改事件:', evt);
    console.log('📋 事件详情:', evt.detail);

    const { annotation, toolName } = evt.detail;
    console.log(`【annotationmanager】🔄 注释修改完成: ${toolName}`);

    // 确保有活动的图像ID
    if (!this.activeImageId) {
      console.warn('【annotationmanager】没有活动的图像ID，跳过注释更新');
      return;
    }

    // 实现注释更新逻辑
    this.updateAnnotation(annotation, toolName);
  };

  private handleAnnotationRemoved = (evt: any) => {
    console.log('🎯 监听到注释删除事件:', evt);
    console.log('📋 事件详情:', evt.detail);

    const { annotation } = evt.detail;
    const annotationUID = annotation.annotationUID;
    console.log(`【annotationmanager】🗑️ 注释删除完成: ${annotationUID}`);

    // 确保有活动的图像ID
    if (!this.activeImageId) {
      console.warn('【annotationmanager】没有活动的图像ID，跳过注释删除');
      return;
    }

    // 实现注释删除逻辑
    this.deleteAnnotation(annotation);
  };

  // ============ 注释操作方法 ============

  private async loadAnnotationsForImage(imageId: string): Promise<void> {
    if (this.isLoading) {
      console.log(`【annotationmanager】注释正在加载中，跳过: ${imageId}`);
      return;
    }

    this.isLoading = true;
    this.activeImageId = imageId;

    try {
      console.log(`【annotationmanager】📥 加载注释数据: ${imageId}`);

      // 调用API获取注释数据
      const response = await annotationAPI.getAnnotations(imageId);

      if (response.data && Array.isArray(response.data)) {
        const annotationStrings = response.data;

        // 验证注释数据
        // this.validator.validateAnnotationArray(annotationStrings);

        // 反序列化并渲染注释
        await this.renderAnnotations(annotationStrings);

        console.log(`【annotationmanager】✅ 注释加载完成: ${imageId} (${annotationStrings.length} 个注释)`);
      } else {
        console.log(`【annotationmanager】ℹ️ 图像 ${imageId} 没有注释数据`);
      }
    } catch (error) {
      console.error(`【annotationmanager】❌ 注释加载失败 ${imageId}:`, error);
      // 不抛出错误，让应用继续运行
    } finally {
      this.isLoading = false;
    }
  }

  private async saveAnnotation(annotation: any, toolName: string): Promise<void> {
    try {
      console.log(`【annotationmanager】💾 保存注释: ${toolName}`);

      // 序列化注释数据
      const serializedData = this.serializer.serialize(annotation, toolName);

      // 验证序列化数据
      // this.validator.validateAnnotationData(serializedData);

      // 添加到待保存队列（延迟保存）
      this.scheduleSave(serializedData);

      console.log(`【annotationmanager】✅ 注释保存任务已安排: ${toolName}`);
    } catch (error) {
      console.error(`【annotationmanager】❌ 注释保存失败 ${toolName}:`, error);
    }
  }

  private async updateAnnotation(annotation: any, toolName: string): Promise<void> {
    try {
      console.log(`【annotationmanager】🔄 更新注释: ${toolName}`);

      // 复用保存逻辑
      await this.saveAnnotation(annotation, toolName);

      console.log(`【annotationmanager】✅ 注释更新完成: ${toolName}`);
    } catch (error) {
      console.error(`【annotationmanager】❌ 注释更新失败 ${toolName}:`, error);
    }
  }

  private async deleteAnnotation(annotation: any): Promise<void> {
    try {
      const annotationUID = annotation.annotationUID;
      console.log(`【annotationmanager】🗑️ 删除注释: ${annotationUID}`);

      if (!this.activeImageId) {
        console.warn('【annotationmanager】没有活动的图像ID，跳过删除操作');
        return;
      }

      // 从 annotation 中获取 FrameOfReferenceUID
      const forUID = annotation.metadata?.referencedImageId;

      if (!forUID) {
        console.warn('【annotationmanager】FrameOfReferenceUID 未找到，跳过删除操作');
        return;
      }

      // 用 FrameOfReferenceUID 查找相关的 elements
      const elements = this.findElementsByFOR(forUID);

      // 收集删除后的所有注释
      const allAnnotationStrings: string[] = [];

      elements.forEach(element => {
        const anns = corAnnotation.state.getAnnotations('', element);

        if (anns) {
          // 序列化所有注释
          for (const [toolName, ann] of Object.entries(anns as any)) {
            try {
              const serialized = this.serializer.serialize(ann, toolName);
              allAnnotationStrings.push(serialized);
            } catch (error) {
              console.error('序列化注释失败:', error);
              // 跳过序列化失败的注释
            }
          }
        }
      });

      // 保存所有注释
      await annotationAPI.saveAnnotations(this.activeImageId, allAnnotationStrings);

      console.log(`【annotationmanager】✅ 注释删除完成: ${annotationUID} (剩余 ${allAnnotationStrings.length} 个注释)`);
    } catch (error) {
      console.error(`【annotationmanager】❌ 注释删除失败:`, error);
    }
  }

  // 用 FrameOfReferenceUID 查找 viewport elements
  private findElementsByFOR(imageId: string): any[] {
    const elements: any[] = [];
    if (!!getRenderingEngines) {
      const renderingEngines = getRenderingEngines();
      renderingEngines?.forEach((re: IRenderingEngine) => {
        re.getViewports().forEach((vp: IStackViewport) => {
          if (vp && vp.hasImageId(imageId) === true && vp.element) {
            elements.push(vp.element);
          }
        });
      });
    } else {
      console.warn('【annotationmanager】getRenderingEngines 方法不可用，无法查找元素');
    }


    return elements;
  }

  private async renderAnnotations(annotationStrings: string[]): Promise<void> {
    console.log(`【annotationmanager】🎨 渲染 ${annotationStrings.length} 个注释`);

    for (const annotationString of annotationStrings) {
      try {
        // 反序列化为Cornerstone格式
        const deserializedAnnotation = this.serializer.deserialize(annotationString);

        // 添加到Cornerstone注释状态
        corAnnotation.state.addAnnotation(deserializedAnnotation, deserializedAnnotation.metadata?.toolName || 'UnknownTool');

        console.log(`【annotationmanager】✅ 注释渲染成功`);
      } catch (error) {
        console.error(`【annotationmanager】❌ 注释渲染失败:`, error);
        // 继续处理其他注释
      }
    }
  }

  // ============ 延迟保存机制 ============

  /**
   * 安排延迟保存
   */
  private scheduleSave(annotationString: string): void {
    try {
      // 从JSON字符串中提取ID作为key
      const annotation = JSON.parse(annotationString);
      const key = annotation.annotationUID || annotation.id || `temp_${Date.now()}`;

      // 添加到待保存队列
      this.pendingChanges.set(key, annotationString);

      // 取消之前的延迟保存
      if (this.saveTimeout) {
        clearTimeout(this.saveTimeout);
      }

      // 设置新的延迟保存（1秒后）
      this.saveTimeout = setTimeout(() => {
        this.performBulkSave();
      }, 1000);
    } catch (error) {
      console.error('安排保存时解析注释失败:', error);
    }
  }

  /**
   * 执行批量保存
   */
  private async performBulkSave(): Promise<void> {
    if (this.pendingChanges.size === 0 || !this.activeImageId) {
      return;
    }

    const changes = Array.from(this.pendingChanges.values());
    this.pendingChanges.clear();

    try {
      console.log(`【annotationmanager】💾 批量保存 ${changes.length} 个注释`);

      // 调用API保存注释
      await annotationAPI.saveAnnotations(this.activeImageId, changes);

      console.log(`【annotationmanager】✅ 批量保存成功: ${changes.length} 个注释`);
    } catch (error) {
      console.error(`【annotationmanager】❌ 批量保存失败:`, error);

      // 保存失败时，重新加入待保存队列
      changes.forEach(change => {
        try {
          const annotation = JSON.parse(change);
          const key = annotation.annotationUID || annotation.id || `temp_${Date.now()}`;
          this.pendingChanges.set(key, change);
        } catch (error) {
          console.error('重新加入待保存队列时解析失败:', error);
        }
      });

      // 可以在这里实现重试逻辑
    }
  }
}