"use client";

import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { useCallback } from "react";
import {
  createAppointment,
  getAvailableDates,
  listAppointments,
  getUserAppointments,
  getUserAppointmentStats,
  getAppointmentDetail,
  scheduleAppointment,
  rejectAppointment,
  getAdminAvailability,
  updateAdminAvailability,
  getAppointmentStats,
  getJitsiMeetingInfo,
  getWeeklyAvailability,
  getAvailabilityConfig,
  checkDateAvailability,
  getAvailabilityOverview,
} from "@/lib/actions/appointments";
import type {
  CreateAppointmentInput,
  ScheduleAppointmentInput,
  RejectAppointmentInput,
  UpdateAvailabilityInput,
} from "@/lib/schema/appointments";
import type {
  Appointment,
  AdminAvailability,
  AppointmentStats,
  UserAppointmentStats,
  AvailableDatesResponse,
  JitsiMeetingInfo,
  WeeklyAvailabilityResponse,
  AvailabilityConfig,
  CheckDateAvailabilityResponse,
  AvailabilityOverview,
} from "@/lib/models/appointments";

export function useAppointments(options?: { 
  enableAvailableDates?: boolean;
  enableStats?: boolean;
  enableConfig?: boolean;
  enableWeeklyAvailability?: boolean;
  enableOverview?: boolean;
}) {
  const queryClient = useQueryClient();
  const enableAvailableDates = options?.enableAvailableDates ?? false;
  const enableStats = options?.enableStats ?? true;
  const enableConfig = options?.enableConfig ?? true;
  const enableWeeklyAvailability = options?.enableWeeklyAvailability ?? true;
  const enableOverview = options?.enableOverview ?? true;

  // Get available dates query (optional, disabled by default - using weekly_availability as primary source)
  // Can be enabled when explicitly needed (e.g., on admin booking page)
  const availableDatesQuery = useQuery<AvailableDatesResponse>({
    queryKey: ["appointments", "available-dates"],
    queryFn: () => getAvailableDates(),
    enabled: enableAvailableDates, // Can be enabled when needed
    staleTime: 5 * 60 * 1000, // 5 minutes
    retry: 0, // Don't retry failed requests
  });

  // Get weekly availability query
  const weeklyAvailabilityQuery = useQuery<WeeklyAvailabilityResponse>({
    queryKey: ["appointments", "weekly-availability"],
    queryFn: async () => {
      const data = await getWeeklyAvailability();
      // Normalize response format - ensure it's always an object with week array
      if (Array.isArray(data)) {
        return { week: data };
      }
      return data;
    },
    enabled: enableWeeklyAvailability,
    staleTime: 5 * 60 * 1000, // 5 minutes
  });

  // Get availability config query
  const availabilityConfigQuery = useQuery<AvailabilityConfig>({
    queryKey: ["appointments", "availability-config"],
    queryFn: () => getAvailabilityConfig(),
    enabled: enableConfig,
    staleTime: 60 * 60 * 1000, // 1 hour (config rarely changes)
  });

  // Get availability overview query
  const availabilityOverviewQuery = useQuery<AvailabilityOverview>({
    queryKey: ["appointments", "availability-overview"],
    queryFn: () => getAvailabilityOverview(),
    enabled: enableOverview,
    staleTime: 5 * 60 * 1000, // 5 minutes
  });

  // List appointments query
  const appointmentsQuery = useQuery<Appointment[]>({
    queryKey: ["appointments", "list"],
    queryFn: async () => {
      const data = await listAppointments();
      return data || [];
    },
    enabled: true, // Enable by default to fetch user appointments
    staleTime: 30 * 1000, // 30 seconds
    retry: 1, // Retry once on failure
    refetchOnMount: true, // Always refetch when component mounts
  });

  // Get user appointments query (disabled - using listAppointments instead)
  const userAppointmentsQuery = useQuery<Appointment[]>({
    queryKey: ["appointments", "user"],
    queryFn: () => getUserAppointments(),
    enabled: false, // Disabled - using listAppointments endpoint instead
    staleTime: 30 * 1000, // 30 seconds
  });

  // Get appointment detail query
  const useAppointmentDetail = (id: string | null) => {
    return useQuery<Appointment>({
      queryKey: ["appointments", "detail", id],
      queryFn: () => getAppointmentDetail(id!),
      enabled: !!id,
    });
  };

  // Get admin availability query
  const adminAvailabilityQuery = useQuery<AdminAvailability>({
    queryKey: ["appointments", "admin", "availability"],
    queryFn: () => getAdminAvailability(),
    staleTime: 5 * 60 * 1000, // 5 minutes
  });

  // Get appointment stats query
  const appointmentStatsQuery = useQuery<AppointmentStats>({
    queryKey: ["appointments", "stats"],
    queryFn: () => getAppointmentStats(),
    staleTime: 1 * 60 * 1000, // 1 minute
  });

  // Get user appointment stats query
  const userAppointmentStatsQuery = useQuery<UserAppointmentStats>({
    queryKey: ["appointments", "user", "stats"],
    queryFn: () => getUserAppointmentStats(),
    enabled: enableStats,
    staleTime: 1 * 60 * 1000, // 1 minute
  });

  // Get Jitsi meeting info query
  const useJitsiMeetingInfo = (id: string | null) => {
    return useQuery<JitsiMeetingInfo>({
      queryKey: ["appointments", "jitsi", id],
      queryFn: () => getJitsiMeetingInfo(id!),
      enabled: !!id,
      staleTime: 30 * 1000, // 30 seconds
    });
  };

  // Create appointment mutation
  const createAppointmentMutation = useMutation({
    mutationFn: (input: CreateAppointmentInput) => createAppointment(input),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ["appointments"] });
    },
  });

  // Schedule appointment mutation
  const scheduleAppointmentMutation = useMutation({
    mutationFn: ({ id, input }: { id: string; input: ScheduleAppointmentInput }) =>
      scheduleAppointment(id, input),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ["appointments"] });
    },
  });

  // Reject appointment mutation
  const rejectAppointmentMutation = useMutation({
    mutationFn: ({ id, input }: { id: string; input: RejectAppointmentInput }) =>
      rejectAppointment(id, input),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ["appointments"] });
    },
  });

  // Update admin availability mutation
  const updateAdminAvailabilityMutation = useMutation({
    mutationFn: (input: UpdateAvailabilityInput) => updateAdminAvailability(input),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ["appointments", "admin", "availability"] });
      queryClient.invalidateQueries({ queryKey: ["appointments", "available-dates"] });
    },
  });

  // Convenience functions
  const create = useCallback(
    async (input: CreateAppointmentInput) => {
      return await createAppointmentMutation.mutateAsync(input);
    },
    [createAppointmentMutation]
  );

  const schedule = useCallback(
    async (id: string, input: ScheduleAppointmentInput) => {
      return await scheduleAppointmentMutation.mutateAsync({ id, input });
    },
    [scheduleAppointmentMutation]
  );

  const reject = useCallback(
    async (id: string, input: RejectAppointmentInput) => {
      return await rejectAppointmentMutation.mutateAsync({ id, input });
    },
    [rejectAppointmentMutation]
  );

  const updateAvailability = useCallback(
    async (input: UpdateAvailabilityInput) => {
      return await updateAdminAvailabilityMutation.mutateAsync(input);
    },
    [updateAdminAvailabilityMutation]
  );

  const fetchAppointments = useCallback(
    async (email?: string) => {
      const data = await listAppointments(email);
      queryClient.setQueryData(["appointments", "list"], data);
      return data;
    },
    [queryClient]
  );

  return {
    // Queries
    availableDates: availableDatesQuery.data?.dates || [],
    availableDatesResponse: availableDatesQuery.data,
    weeklyAvailability: weeklyAvailabilityQuery.data,
    availabilityConfig: availabilityConfigQuery.data,
    availabilityOverview: availabilityOverviewQuery.data,
    appointments: appointmentsQuery.data || [],
    userAppointments: userAppointmentsQuery.data || [],
    adminAvailability: adminAvailabilityQuery.data,
    appointmentStats: appointmentStatsQuery.data,
    userAppointmentStats: userAppointmentStatsQuery.data,
    
    // Query states
    isLoadingAvailableDates: availableDatesQuery.isLoading,
    isLoadingWeeklyAvailability: weeklyAvailabilityQuery.isLoading,
    isLoadingAvailabilityConfig: availabilityConfigQuery.isLoading,
    isLoadingAvailabilityOverview: availabilityOverviewQuery.isLoading,
    isLoadingAppointments: appointmentsQuery.isLoading,
    isLoadingUserAppointments: userAppointmentsQuery.isLoading,
    isLoadingAdminAvailability: adminAvailabilityQuery.isLoading,
    isLoadingStats: appointmentStatsQuery.isLoading,
    isLoadingUserStats: userAppointmentStatsQuery.isLoading,
    
    // Query refetch functions
    refetchAvailableDates: availableDatesQuery.refetch,
    refetchWeeklyAvailability: weeklyAvailabilityQuery.refetch,
    refetchAvailabilityConfig: availabilityConfigQuery.refetch,
    refetchAvailabilityOverview: availabilityOverviewQuery.refetch,
    refetchAppointments: appointmentsQuery.refetch,
    refetchUserAppointments: userAppointmentsQuery.refetch,
    refetchAdminAvailability: adminAvailabilityQuery.refetch,
    refetchStats: appointmentStatsQuery.refetch,
    refetchUserStats: userAppointmentStatsQuery.refetch,
    
    // Helper functions
    checkDateAvailability: async (date: string) => {
      return await checkDateAvailability(date);
    },
    
    // Hooks for specific queries
    useAppointmentDetail,
    useJitsiMeetingInfo,
    
    // Mutations
    create,
    schedule,
    reject,
    updateAvailability,
    fetchAppointments,
    
    // Mutation states
    isCreating: createAppointmentMutation.isPending,
    isScheduling: scheduleAppointmentMutation.isPending,
    isRejecting: rejectAppointmentMutation.isPending,
    isUpdatingAvailability: updateAdminAvailabilityMutation.isPending,
    
    // Direct mutation access (if needed)
    createAppointmentMutation,
    scheduleAppointmentMutation,
    rejectAppointmentMutation,
    updateAdminAvailabilityMutation,
  };
}