import { Middleware, PayloadAction } from '@reduxjs/toolkit';
import prepare, { unprepare } from '../domain/exam/prepare';
import { BusinessFlowState, setBusinessFlow } from './BusinessFlowSlice';
import { setFeedbackOpen } from './exam/largeScreenSlice';
import { setFeatureNotAvailableOpen } from './featureNotAvailableSlice';
import { suspendOrCompleteStudy } from '@/API/patient/workActions';
import { setExpDisable } from '@/API/exam/deviceActions';
import { RootState } from './store';
import { getQuota } from '@/API/security/quotaActions';
import { showQuotaAlert } from './security/quotaModalSlice';
import emitter from '@/utils/eventEmitter';
import {
  setBodyPositions,
  transformWorksToBodyPositions,
} from './exam/bodyPositionListSlice';
import {
  worklistToProcess,
  prepareWorksForExam,
} from '@/domain/patient/worklistToExam';
import { executeRegisterLogic } from '@/domain/patient/registerLogic';
import registerToExam from '@/domain/patient/registerToExam';
import { addWork, clearWorks } from './exam/examWorksCacheSlice';
import { resetViewerContainer } from './view/viewerContainerSlice';

let continueBusinessFlow = '';

const businessFlowMiddlewareLogic: Middleware =
  (store) => (next) => async (action: PayloadAction<string>) => {
    //const result = next(action);
    // console.log(
    //   `[businessFlowMiddleware] Action dispatched: ${action.type} ${action.payload}`
    // );
    if (action.type !== setBusinessFlow.type) {
      return next(action); // Only handle setBusinessFlow actions
    }

    // 响应功能不可用后的继续操作
    if (action.payload === 'continueAfterFeatureNotAvailable') {
      console.log(
        `[businessFlowMiddleware] Continuing to: ${continueBusinessFlow}`
      );
      return next({ ...action, payload: continueBusinessFlow });
    }
    const state = store.getState().BusinessFlow as BusinessFlowState;
    const currentKey = state.currentKey;
    const targetKey = action.payload;
    console.log(`[businessFlowMiddleware] currentKey: ${currentKey}`);
    console.log(
      `[businessFlowMiddleware] Current business flow is now: ${state.currentKey} ; Last key was: ${state.lastKey}`
    );
    //进入检查
    if (action.payload === 'exam') {
      //进入检查前判断配额
      try {
        const quotaResponse = await getQuota();
        if (quotaResponse.data.available <= 0) {
          store.dispatch(showQuotaAlert());
          return;
        }
        if (quotaResponse.code !== '0x000000') {
          store.dispatch(showQuotaAlert());
          return;
        }
      } catch (error) {
        console.error('[businessFlowMiddleware] Quota check failed:', error);
        store.dispatch(showQuotaAlert());
        return;
      }
      if (currentKey === 'worklist' || currentKey === 'history') {
        const state = store.getState();

        // 获取选中的 study
        const selectedIds =
          currentKey === 'worklist'
            ? state.workSelection.selectedIds
            : state.historySelection.selectedIds;

        const entitiesData =
          currentKey === 'worklist'
            ? state.workEntities.data
            : state.historyEntities.data;

        if (selectedIds.length === 0) {
          console.warn('[businessFlowMiddleware] No study selected for exam');
          return; // 阻止进入 exam
        }

        const selectedWork = entitiesData.find(
          (work) => work.StudyID === selectedIds[0]
        );

        if (!selectedWork) {
          console.error('[businessFlowMiddleware] Selected study not found');
          return; // 阻止进入 exam
        }

        try {
          // 使用公共函数准备数据
          const [updatedTask] = await prepareWorksForExam(selectedWork);

          // 清空并更新缓存
          store.dispatch(clearWorks());
          store.dispatch(addWork(updatedTask));

          // 转换为 body positions
          const bodyPositions = await transformWorksToBodyPositions([
            updatedTask,
          ]);
          store.dispatch(setBodyPositions(bodyPositions));

          console.log(
            `[businessFlowMiddleware] Successfully prepared ${bodyPositions.length} body positions for exam`
          );
        } catch (error) {
          console.error(
            '[businessFlowMiddleware] Failed to prepare data for exam:',
            error
          );
          return; // 阻止进入 exam
        }
      }

      // 进入检查前，如果是从register来的，则判断数据合法性，执行注册等逻辑
      if (currentKey === 'register') {
        const systemMode = (store.getState() as RootState).systemMode.mode;

        // 如果是急诊模式，跳过验证（急诊流程已经完成注册）
        if (systemMode === 'Emergency') {
          console.log(
            '[businessFlowMiddleware] Emergency mode, skipping register validation'
          );
          // 急诊模式下仍需要准备 body positions
          try {
            const state = store.getState();
            const works = state.examWorksCache.works;
            const bodyPositions = await transformWorksToBodyPositions(works);
            store.dispatch(setBodyPositions(bodyPositions));
          } catch (error) {
            console.error(
              '[businessFlowMiddleware] Failed to prepare body positions:',
              error
            );
            return; // 阻止进入exam
          }
        } else {
          // 正常注册流程，需要验证
          const result = await executeRegisterLogic(store);

          if (!result.success) {
            console.log(
              '[businessFlowMiddleware] Register validation failed, blocking entry to exam'
            );
            return; // 阻止进入exam
          }
          try {
            await registerToExam(result.data!);
            const state = store.getState();
            const works = state.examWorksCache.works;
            await transformWorksToBodyPositions(works)
              .then((bodyPositions) => {
                store.dispatch(setBodyPositions(bodyPositions));
              })
              .catch((error) => {
                console.error(
                  '[businessFlowMiddleware] Transform works to body positions failed:',
                  error
                );
                return; // 阻止进入exam
              });
          } catch (_error) {
            console.log(
              '[businessFlowMiddleware] Register validation failed',
              _error
            );
            return; // 阻止进入exam
          }
          console.log(
            '[businessFlowMiddleware] Register validation succeeded, proceeding to exam'
          );
        }
      }
      prepare();
      return next(action);
    }
    if (action.payload === 'process') {
      if (isFromExamToView(action.payload, currentKey)) {
        //从检查进入图像处理，有可能是曝光导致的，怎么知道呢？看发生器状态
        if (store.getState().generatorMonitor.acquisitionState === 1) {
          //发生器正在采集
          console.log(
            `[businessFlowMiddleware] Exiting exam flow, but generator is still acquiring.`
          );
          return next(action); // 发生器正在采集，不能退出
        } else {
          //非曝光导致的从检查进入处理      // 说明从检查退出 , 执行清理
          console.log(
            `[businessFlowMiddleware] Exiting exam flow, last key was: ${state.lastKey}`
          );
          // 离开检查前，禁止发生器曝光
          try {
            await setExpDisable();
          } catch (error) {
            console.error('[businessFlowMiddleware] setExpDisable Failed to disable exposure:', error);
          }
          unprepare();
        }
      } else {
        //不是从检查进入图像处理，
        if (currentKey === 'worklist') {
          //从工单进入图像处理,准备数据
          const state = store.getState() as RootState;
          const selectedIds = state.workSelection.selectedIds;

          if (selectedIds.length > 0) {
            try {
              await worklistToProcess(selectedIds);
              console.log(
                `[businessFlowMiddleware] Successfully processed ${selectedIds.length} selected works from worklist to process`
              );
            } catch (error) {
              console.error(
                '[businessFlowMiddleware] Error processing works from worklist:',
                error
              );
              // 可以选择是否阻止进入process，这里我们选择继续
              return;
            }
          } else {
            console.warn(
              '[businessFlowMiddleware] No works selected in worklist to process'
            );
          }
        }
        if (currentKey === 'history') {
          //从历史进入图像处理，
          //从工单进入图像处理,准备数据
          const state = store.getState() as RootState;
          const selectedIds = state.historySelection.selectedIds;

          if (selectedIds.length > 0) {
            try {
              await worklistToProcess(selectedIds);
              console.log(
                `[businessFlowMiddleware] Successfully processed ${selectedIds.length} selected works from worklist to process`
              );
            } catch (error) {
              console.error(
                '[businessFlowMiddleware] Error processing works from worklist:',
                error
              );
              // 可以选择是否阻止进入process，这里我们选择继续
              return;
            }
          } else {
            console.warn(
              '[businessFlowMiddleware] No works selected in worklist to process'
            );
          }
        }
        return next(action);
      }
    }
    if (
      action.payload === 'archivelist' ||
      action.payload === 'bin' ||
      action.payload === 'outputlist' ||
      action.payload === 'print'
    ) {
      console.log(
        `[businessFlowMiddleware] Feature not available: ${action.payload}`
      );
      continueBusinessFlow = action.payload; // 保存要继续的业务流程
      store.dispatch(setFeatureNotAvailableOpen(true));
      return;
    }
    if (isLeavingProcess(action.payload, currentKey)) {
      // 说明从图像处理退出 , 执行清理
      console.log(
        `[businessFlowMiddleware] Leaving process flow, last key was: ${state.lastKey}`
      );
      // 重置 viewerContainerSlice 到初始状态
      store.dispatch(resetViewerContainer());
    }
    //退出检查的判断和退出处理的判断
    if ((
      isExitingExam(action.payload, currentKey) &&
      action.payload !== 'exitExamCompleted' &&
      action.payload !== 'exitExamSuspended' &&
      action.payload !== 'process' // 从检查进入处理，不需要检查曝光情况
    ) || 
    isLeavingProcess(action.payload, currentKey) &&
      action.payload !== 'exitExamCompleted' &&
      action.payload !== 'exitExamSuspended' &&
      action.payload !== 'exam'
  ){
      console.log(
        `[businessFlowMiddleware] Exiting exam flow to go to : ${action.payload}`
      );
      const exposureStatus = store.getState().bodyPositionList.exposureStatus;
      console.log(
        `[businessFlowMiddleware] Exposure status: ${exposureStatus}`
      );
      if (exposureStatus === 'Half Exposed') {
        store.dispatch(setFeedbackOpen(true)); //显示反馈框
        // store.dispatch({ type: 'SET_CONTINUE_BUSINESS_FLOW', payload: currentKey });
        continueBusinessFlow = action.payload; // 保存退出检查时，要去哪个业务流程
        return; //阻止退出exam 或者 process
      } else if (exposureStatus === 'Fully Exposed') {
        // Notify backend
        console.log(
          '[businessFlowMiddleware] Fully Exposed, notifying backend'
        );
        const studyId =
          (store.getState() as RootState)?.bodyPositionList?.selectedBodyPosition
            ?.work?.StudyID ?? '';
        suspendOrCompleteStudy(studyId, 'Completed').then(() => {
          console.log(`[businessFlowMiddleware] 全曝光，通知后端完成`)
        }).catch((error) => {
          console.log(`[businessFlowMiddleware] 全曝光，通知后端失败 ${error}`);
        });
        // Proceed with the action
        return next(action);
      } else if (exposureStatus === 'Not Exposed') {
        // Proceed with the action
        return next(action);
      }
    }
    //退出检查的中间过程
    if (action.payload === 'exitExamCompleted') {
      // Notify backend with different interfaces for completed and suspended
      console.log(
        `[businessFlowMiddleware] Notifying backend for ${action.payload}`
      );
      // 通知服务端。
      const studyId =
        (store.getState() as RootState)?.bodyPositionList?.selectedBodyPosition
          ?.work?.StudyID ?? '';
      if (!studyId) {
        console.error(
          '[businessFlowMiddleware] No study ID found for the selected body position.'
        );
      }
      await suspendOrCompleteStudy(studyId, 'Completed');
      return next({ ...action, payload: continueBusinessFlow });
    }
    if (action.payload === 'exitExamSuspended') {
      // Notify backend with different interfaces for completed and suspended
      const studyId =
        (store.getState() as RootState)?.bodyPositionList?.selectedBodyPosition
          ?.work?.StudyID ?? '';
      if (!studyId) {
        console.error(
          '[businessFlowMiddleware] No study ID found for the selected body position.'
        );
      }
      await suspendOrCompleteStudy(studyId, 'InProgress');
      console.log(
        `[businessFlowMiddleware] Notifying backend for ${action.payload}`
      );
      return next({ ...action, payload: continueBusinessFlow });
    }
    const result = next(action);

    // 发射业务流程切换完成事件
    emitter.emit('BUSINESS_FLOW_CHANGED', {
      from: currentKey,
      to: targetKey,
      timestamp: Date.now(),
    });

    console.log(
      `[businessFlowMiddleware] Emitted BUSINESS_FLOW_CHANGED event: ${currentKey} -> ${targetKey}`
    );

    return result;
  };
/**
 * 从检查到图像处理
 */
function isFromExamToView(currentAction: string, currentKey: string): boolean {
  return currentAction === 'process' && currentKey === 'exam';
}
function isExitingExam(currentAction: string, currentKey: string): boolean {
  console.log(
    `[businessFlowMiddleware] Checking if exiting exam: ${currentAction} vs ${currentKey}`
  );
  return currentAction !== 'exam' && currentKey === 'exam';
}
function isLeavingProcess(currentAction: string, currentKey: string): boolean {
  return currentAction !== 'process' && currentKey === 'process';
}

export default businessFlowMiddlewareLogic;