import { useCallback, useEffect } from 'react';
import { useAppDispatch } from '@/hooks/useAppDispatch';
import { useAppSelector } from '@/hooks/useAppSelector';
import { useSocket } from '@/socket/socketContext';
import { useAuthService } from '@/hooks/useAuth';
import { SocketEvents } from '@/shared/socket-events';
import logger from '@/utils/errorLogger';
import alertService from '@/services/alerts/alertService';

import { ITaskAssigneesUpdateResponse } from '@/types/tasks/task-assignee-update-response';
import { ILabelsChangeResponse } from '@/types/tasks/taskList.types';
import { ITaskListStatusChangeResponse } from '@/types/tasks/task-list-status.types';
import { ITaskListPriorityChangeResponse } from '@/types/tasks/task-list-priority.types';
import { ITaskPhaseChangeResponse } from '@/types/tasks/task-phase-change-response';
import { InlineMember } from '@/types/teamMembers/inlineMember.types';
import { IProjectTask } from '@/types/project/projectTasksViewModel.types';
import { ITaskListGroup } from '@/types/tasks/taskList.types';

import {
  fetchTaskAssignees,
  updateTaskAssignees,
  fetchLabelsByProject,
  updateTaskLabel,
  updateTaskStatus,
  updateTaskPriority,
  updateTaskEndDate,
  updateTaskEstimation,
  updateTaskName,
  updateTaskPhase,
  updateTaskStartDate,
  updateTaskDescription,
  updateSubTasks,
  updateTaskProgress,
} from '@/features/tasks/tasks.slice';
import { fetchLabels } from '@/features/taskAttributes/taskLabelSlice';
import {
  setStartDate,
  setTaskAssignee,
  setTaskEndDate,
  setTaskLabels,
  setTaskPriority,
  setTaskStatus,
  setTaskSubscribers,
} from '@/features/task-drawer/task-drawer.slice';
import { deselectAll } from '@/features/projects/bulkActions/bulkActionSlice';

export const useTaskSocketHandlers = () => {
  const dispatch = useAppDispatch();
  const { socket } = useSocket();
  const currentSession = useAuthService().getCurrentSession();
  
  const { loadingAssignees, taskGroups } = useAppSelector((state: any) => state.taskReducer);
  const { projectId } = useAppSelector((state: any) => state.projectReducer);

  // Memoize socket event handlers
  const handleAssigneesUpdate = useCallback(
    (data: ITaskAssigneesUpdateResponse) => {
      if (!data) return;

      const updatedAssignees = data.assignees?.map(assignee => ({
        ...assignee,
        selected: true,
      })) || [];

      const groupId = taskGroups?.find((group: ITaskListGroup) =>
        group.tasks?.some(
          (task: IProjectTask) =>
            task.id === data.id ||
            (task.sub_tasks && task.sub_tasks.some((subtask: IProjectTask) => subtask.id === data.id))
        )
      )?.id;

      if (groupId) {
        dispatch(
          updateTaskAssignees({
            groupId,
            taskId: data.id,
            assignees: updatedAssignees,
          })
        );

        dispatch(
          setTaskAssignee({
            ...data,
            manual_progress: false,
          } as IProjectTask)
        );

        if (currentSession?.team_id && !loadingAssignees) {
          dispatch(fetchTaskAssignees(currentSession.team_id));
        }
      }
    },
    [taskGroups, dispatch, currentSession?.team_id, loadingAssignees]
  );

  const handleLabelsChange = useCallback(
    async (labels: ILabelsChangeResponse) => {
      if (!labels) return;
      
      await Promise.all([
        dispatch(updateTaskLabel(labels)),
        dispatch(setTaskLabels(labels)),
        dispatch(fetchLabels()),
        projectId && dispatch(fetchLabelsByProject(projectId)),
      ]);
    },
    [dispatch, projectId]
  );

  const handleTaskStatusChange = useCallback(
    (response: ITaskListStatusChangeResponse) => {
      if (!response) return;

      if (response.completed_deps === false) {
        alertService.error(
          'Task is not completed',
          'Please complete the task dependencies before proceeding'
        );
        return;
      }

      dispatch(updateTaskStatus(response));
      dispatch(deselectAll());
    },
    [dispatch]
  );

  const handleTaskProgress = useCallback(
    (data: {
      id: string;
      status: string;
      complete_ratio: number;
      completed_count: number;
      total_tasks_count: number;
      parent_task: string;
    }) => {
      if (!data) return;

      dispatch(
        updateTaskProgress({
          taskId: data.parent_task || data.id,
          progress: data.complete_ratio,
          totalTasksCount: data.total_tasks_count,
          completedCount: data.completed_count,
        })
      );
    },
    [dispatch]
  );

  const handlePriorityChange = useCallback(
    (response: ITaskListPriorityChangeResponse) => {
      if (!response) return;

      dispatch(updateTaskPriority(response));
      dispatch(setTaskPriority(response));
      dispatch(deselectAll());
    },
    [dispatch]
  );

  const handleEndDateChange = useCallback(
    (task: {
      id: string;
      parent_task: string | null;
      end_date: string;
    }) => {
      if (!task) return;

      const taskWithProgress = {
        ...task,
        manual_progress: false,
      } as IProjectTask;

      dispatch(updateTaskEndDate({ task: taskWithProgress }));
      dispatch(setTaskEndDate(taskWithProgress));
    },
    [dispatch]
  );

  const handleTaskNameChange = useCallback(
    (data: { id: string; parent_task: string; name: string }) => {
      if (!data) return;
      dispatch(updateTaskName(data));
    },
    [dispatch]
  );

  const handlePhaseChange = useCallback(
    (data: ITaskPhaseChangeResponse) => {
      if (!data) return;
      dispatch(updateTaskPhase(data));
      dispatch(deselectAll());
    },
    [dispatch]
  );

  const handleStartDateChange = useCallback(
    (task: {
      id: string;
      parent_task: string | null;
      start_date: string;
    }) => {
      if (!task) return;

      const taskWithProgress = {
        ...task,
        manual_progress: false,
      } as IProjectTask;

      dispatch(updateTaskStartDate({ task: taskWithProgress }));
      dispatch(setStartDate(taskWithProgress));
    },
    [dispatch]
  );

  const handleTaskSubscribersChange = useCallback(
    (data: InlineMember[]) => {
      if (!data) return;
      dispatch(setTaskSubscribers(data));
    },
    [dispatch]
  );

  const handleEstimationChange = useCallback(
    (task: {
      id: string;
      parent_task: string | null;
      estimation: number;
    }) => {
      if (!task) return;

      const taskWithProgress = {
        ...task,
        manual_progress: false,
      } as IProjectTask;

      dispatch(updateTaskEstimation({ task: taskWithProgress }));
    },
    [dispatch]
  );

  const handleTaskDescriptionChange = useCallback(
    (data: {
      id: string;
      parent_task: string;
      description: string;
    }) => {
      if (!data) return;
      dispatch(updateTaskDescription(data));
    },
    [dispatch]
  );

  const handleNewTaskReceived = useCallback(
    (data: IProjectTask) => {
      if (!data) return;
      if (data.parent_task_id) {
        dispatch(updateSubTasks(data));
      }
    },
    [dispatch]
  );

  const handleTaskProgressUpdated = useCallback(
    (data: {
      task_id: string;
      progress_value?: number;
      weight?: number;
    }) => {
      if (!data || !taskGroups) return;

      if (data.progress_value !== undefined) {
        for (const group of taskGroups) {
          const task = group.tasks?.find((task: IProjectTask) => task.id === data.task_id);
          if (task) {
            dispatch(
              updateTaskProgress({
                taskId: data.task_id,
                progress: data.progress_value,
                totalTasksCount: task.total_tasks_count || 0,
                completedCount: task.completed_count || 0,
              })
            );
            break;
          }
        }
      }
    },
    [dispatch, taskGroups]
  );

  // Register socket event listeners
  useEffect(() => {
    if (!socket) return;

    const eventHandlers = [
      { event: SocketEvents.QUICK_ASSIGNEES_UPDATE.toString(), handler: handleAssigneesUpdate },
      { event: SocketEvents.TASK_LABELS_CHANGE.toString(), handler: handleLabelsChange },
      { event: SocketEvents.TASK_STATUS_CHANGE.toString(), handler: handleTaskStatusChange },
      { event: SocketEvents.TASK_PROGRESS_UPDATED.toString(), handler: handleTaskProgress },
      { event: SocketEvents.TASK_PRIORITY_CHANGE.toString(), handler: handlePriorityChange },
      { event: SocketEvents.TASK_END_DATE_CHANGE.toString(), handler: handleEndDateChange },
      { event: SocketEvents.TASK_NAME_CHANGE.toString(), handler: handleTaskNameChange },
      { event: SocketEvents.TASK_PHASE_CHANGE.toString(), handler: handlePhaseChange },
      { event: SocketEvents.TASK_START_DATE_CHANGE.toString(), handler: handleStartDateChange },
      { event: SocketEvents.TASK_SUBSCRIBERS_CHANGE.toString(), handler: handleTaskSubscribersChange },
      { event: SocketEvents.TASK_TIME_ESTIMATION_CHANGE.toString(), handler: handleEstimationChange },
      { event: SocketEvents.TASK_DESCRIPTION_CHANGE.toString(), handler: handleTaskDescriptionChange },
      { event: SocketEvents.QUICK_TASK.toString(), handler: handleNewTaskReceived },
      { event: SocketEvents.TASK_PROGRESS_UPDATED.toString(), handler: handleTaskProgressUpdated },
    ];

    // Register all event listeners
    eventHandlers.forEach(({ event, handler }) => {
      socket.on(event, handler);
    });

    // Cleanup function
    return () => {
      eventHandlers.forEach(({ event, handler }) => {
        socket.off(event, handler);
      });
    };
  }, [
    socket,
    handleAssigneesUpdate,
    handleLabelsChange,
    handleTaskStatusChange,
    handleTaskProgress,
    handlePriorityChange,
    handleEndDateChange,
    handleTaskNameChange,
    handlePhaseChange,
    handleStartDateChange,
    handleTaskSubscribersChange,
    handleEstimationChange,
    handleTaskDescriptionChange,
    handleNewTaskReceived,
    handleTaskProgressUpdated,
  ]);
};