/**
 * 体位选择协调器 - 统一处理体位选中的完整逻辑
 * 确保自动选中和手动选中使用相同的业务流程
 */

import { message } from 'antd';
import { AppDispatch } from '@/states/store';
import {
  setSelectedBodyPosition,
  ExtendedBodyPosition,
} from '@/states/exam/bodyPositionListSlice';
import { setBodyPositionDetail } from '@/states/exam/bodyPositionDetailSlice';
import { changeBodyPosition } from '@/API/exam/changeBodyPosition';
import { setExpEnable } from '@/API/exam/deviceActions';
import { setBusinessFlow } from '@/states/BusinessFlowSlice';
import emitter from '@/utils/eventEmitter';

export const selectBodyPositionWithFullLogic = async (
  bodyPosition: ExtendedBodyPosition,
  dispatch: AppDispatch,
  currentKey: string,
  showMessage = false
): Promise<void> => {
  try {
    console.log(
      `[bodyPositionSelection] Selecting body position: ${bodyPosition.view_name}`
    );

    // 1. 更新选中状态
    dispatch(setSelectedBodyPosition(bodyPosition));

    // 2. 设置详情显示区域的数据
    dispatch(
      setBodyPositionDetail({
        view_name: bodyPosition.view_name,
        view_description: bodyPosition.view_description,
        view_icon_name: bodyPosition.view_icon_name,
        patient_name: bodyPosition.patient_name,
        patient_id: bodyPosition.patient_id,
        registration_number: bodyPosition.registration_number,
        study_description: bodyPosition.study_description,
        body_position_image: bodyPosition.view_big_icon_name,
        collimator_length: bodyPosition.collimator_length,
        collimator_width: bodyPosition.collimator_width,
        sid: bodyPosition.sid,
        // 🆕 添加新字段
        expose_status: bodyPosition.dview.expose_status,
        sop_instance_uid: bodyPosition.sop_instance_uid,
      })
    );

    // 3. 🆕 如果在exam模式，根据曝光状态决定是否同步设备
    if (currentKey === 'exam') {
      if (bodyPosition.dview.expose_status === 'Unexposed') {
        // 未曝光体位：同步设备，使能曝光
        await changeBodyPosition(bodyPosition.sop_instance_uid);

        // 切换体位成功后，使能发生器曝光
        await setExpEnable();

        const successMsg = `Body position changed successfully: ${bodyPosition.view_name}`;
        console.log(`[bodyPositionSelection] ${successMsg}`);

        if (showMessage) {
          message.success(successMsg);
        }
      } else {
        // 已曝光体位：跳过设备同步，仅更新显示
        console.log(
          `[bodyPositionSelection] Exposed position selected, skipping device sync: ${bodyPosition.view_name}`
        );
        
        if (showMessage) {
          message.info(`已选中已曝光体位: ${bodyPosition.view_name}`);
        }
      }
    } else {
      console.log(
        `[bodyPositionSelection] Current key is ${currentKey}, not executing changeBodyPosition.`
      );
    }
  } catch (error) {
    const errorMsg = 'Failed to change body position';
    console.error(`[bodyPositionSelection] ${errorMsg}:`, error);

    if (showMessage) {
      message.error(errorMsg);
    }

    throw error; // 向上传播错误，让调用者决定如何处理
  }
};

/**
 * 自动选中第一个体位（通常在进入exam时调用）
 * - exam 模式：自动选择第一个未曝光的体位
 * - process 模式：自动选择第一个已曝光的体位
 * - 其他模式：选择第一个体位
 */
export const autoSelectFirstBodyPosition = async (
  bodyPositions: ExtendedBodyPosition[],
  dispatch: AppDispatch,
  currentKey: string
): Promise<void> => {
  if (bodyPositions.length === 0) {
    console.log('[bodyPositionSelection] No body positions available');
    return;
  }

  // 根据当前业务流程选择合适的体位
  let targetBodyPosition: ExtendedBodyPosition | undefined;

  if (currentKey === 'exam') {
    // exam 模式：选择第一个未曝光的体位
    targetBodyPosition = bodyPositions.find(
      (bp) => bp.dview.expose_status === 'Unexposed'
    );
    console.log(
      '[bodyPositionSelection] Auto-selecting first unexposed body position in exam mode'
    );
  } else if (currentKey === 'process') {
    // process 模式：选择第一个已曝光的体位
    targetBodyPosition = bodyPositions.find(
      (bp) => bp.dview.expose_status === 'Exposed'
    );
    console.log(
      '[bodyPositionSelection] Auto-selecting first exposed body position in process mode'
    );
  } else {
    // 其他模式：默认选择第一个
    targetBodyPosition = bodyPositions[0];
    console.log(
      `[bodyPositionSelection] Auto-selecting first body position in ${currentKey} mode`
    );
  }

  if (targetBodyPosition) {
    await selectBodyPositionWithFullLogic(
      targetBodyPosition,
      dispatch,
      currentKey,
      false // 自动选中时不显示用户消息
    );
  } else {
    console.warn(
      `[bodyPositionSelection] No suitable body position found for ${currentKey} mode`
    );
  }
};

/**
 * 手动选中体位（用户点击时调用）
 */
export const manualSelectBodyPosition = async (
  bodyPosition: ExtendedBodyPosition,
  dispatch: AppDispatch,
  currentKey: string
): Promise<void> => {
  console.log(
    `[bodyPositionSelection] Manual selection: ${bodyPosition.view_name}`
  );
  await selectBodyPositionWithFullLogic(
    bodyPosition,
    dispatch,
    currentKey,
    true // 手动选中时显示用户消息
  );
};

/**
 * 带流程切换的体位选择（用户点击体位时调用，根据曝光状态自动切换流程）
 * @param bodyPosition 要选中的体位
 * @param dispatch Redux dispatch
 * @param currentKey 当前业务流程 key
 * @param allowFlowSwitch 是否允许自动切换流程（默认 true）
 */
export const manualSelectBodyPositionWithFlowSwitch = async (
  bodyPosition: ExtendedBodyPosition,
  dispatch: AppDispatch,
  currentKey: string,
  allowFlowSwitch: boolean = true
): Promise<void> => {
  const isExposed = bodyPosition.dview.expose_status === 'Exposed';
  const isUnexposed = bodyPosition.dview.expose_status === 'Unexposed';

  let targetFlow = currentKey;
  let needSwitch = false;

  // 🆕 只有在允许流程切换时才判断是否需要切换
  if (allowFlowSwitch) {
    // 判断是否需要切换流程
    if (currentKey === 'exam' && isExposed) {
      targetFlow = 'process';
      needSwitch = true;
      console.log(
        `[bodyPositionSelection] Detected exposed position in exam mode, will switch to process`
      );
    } else if (currentKey === 'process' && isUnexposed) {
      targetFlow = 'exam';
      needSwitch = true;
      console.log(
        `[bodyPositionSelection] Detected unexposed position in process mode, will switch to exam`
      );
    }
  } else {
    console.log(
      `[bodyPositionSelection] Flow switch disabled, staying in ${currentKey} mode`
    );
  }

  if (needSwitch) {
    console.log(
      `[bodyPositionSelection] Switching flow from ${currentKey} to ${targetFlow}`
    );

    // 创建一个 Promise 来等待流程切换完成
    const flowSwitchPromise = new Promise<void>((resolve) => {
      // 设置一个一次性监听器
      const handler = (data: {
        from: string;
        to: string;
        timestamp: number;
      }) => {
        if (data.to === targetFlow) {
          console.log(
            `[bodyPositionSelection] Flow switch completed: ${data.from} -> ${data.to}`
          );
          // 移除监听器
          emitter.off('BUSINESS_FLOW_CHANGED', handler);
          resolve();
        }
      };

      emitter.on('BUSINESS_FLOW_CHANGED', handler);

      // 设置超时保护，防止事件永远不触发
      setTimeout(() => {
        emitter.off('BUSINESS_FLOW_CHANGED', handler);
        console.warn(
          '[bodyPositionSelection] Flow switch timeout, proceeding anyway'
        );
        resolve();
      }, 2000); // 2秒超时
    });

    // 触发流程切换
    dispatch(setBusinessFlow(targetFlow));

    // 等待流程切换完成
    await flowSwitchPromise;
  }

  // 使用正确的流程 key 选中体位
  await selectBodyPositionWithFullLogic(
    bodyPosition,
    dispatch,
    targetFlow,
    true
  );
};