import { useState, useEffect, useCallback, useMemo } from "react";
import { useDebounce } from "../useDebounce";
import useCompanyService from "./useCompanyService";
import {
  type Company,
  type CompanyFilters,
  type CreateCompanyData,
  type UpdateCompanyData,
} from "../../services/companyService";

interface UseCompanyState {
  companies: Company[];
  total: number;
  currentPage: number;
  totalPages: number;
  itemsPerPage: number;
  searchTerm: string;
  subscriptionStatusFilter: "all" | "active" | "expired" | "upcoming";
  sortField: string | null;
  sortDirection: "ASC" | "DESC";
  loading: boolean;
  error: string | null;
}

interface UseCompanyActions {
  setSearchTerm: (term: string) => void;
  setSubscriptionStatusFilter: (
    filter: "all" | "active" | "expired" | "upcoming"
  ) => void;
  setSortField: (field: string | null) => void;
  setSortDirection: (direction: "ASC" | "DESC") => void;
  setCurrentPage: (page: number) => void;
  setItemsPerPage: (items: number) => void;
  clearFilters: () => void;
  refreshData: () => Promise<void>;
  createCompany: (data: CreateCompanyData) => Promise<boolean>;
  updateCompany: (data: UpdateCompanyData) => Promise<boolean>;
  deleteCompany: (id: string) => Promise<boolean>;
  toggleCompanyStatus: (id: string) => Promise<boolean>;
  getCompanyById: (id: string) => Promise<Company | null>;
}

const INITIAL_STATE: UseCompanyState = {
  companies: [],
  total: 0,
  currentPage: 1,
  totalPages: 0,
  itemsPerPage: 100,
  searchTerm: "",
  subscriptionStatusFilter: "all",
  sortField: "created_at",
  sortDirection: "DESC",
  loading: false,
  error: null,
};

function useCompany() {
  const [state, setState] = useState<UseCompanyState>(INITIAL_STATE);
  const service = useCompanyService();

  // Debounce search term with 500ms delay
  const debouncedSearchTerm = useDebounce(state.searchTerm, 500);

  // Memoize filters to prevent unnecessary API calls
  const filters = useMemo<CompanyFilters>(() => {
    let subscription_status: string | undefined = undefined;

    if (state.subscriptionStatusFilter !== "all") {
      subscription_status = state.subscriptionStatusFilter;
    }

    const filters: CompanyFilters = {
      search: debouncedSearchTerm,
      subscription_status,
      page: state.currentPage,
      limit: state.itemsPerPage,
    };

    if (state.sortField) {
      filters.column_name = state.sortField;
      filters.order = state.sortDirection.toUpperCase() as "ASC" | "DESC";
    }

    return filters;
  }, [
    debouncedSearchTerm,
    state.subscriptionStatusFilter,
    state.currentPage,
    state.itemsPerPage,
    state.sortField,
    state.sortDirection,
  ]);

  // Auto-fetch when filters change
  useEffect(() => {
    const fetchCompanies = async () => {
      setState((prev) => ({ ...prev, loading: true, error: null }));

      const result = await service.getCompanies(filters);

      if (result.success && result.data) {
        const total = result.data.total ?? 0;
        const limit = result.data.limit ?? 10;

        setState((prev) => ({
          ...prev,
          companies: result.data.data ?? [],
          total,
          totalPages: Math.ceil(total / limit),
          loading: false,
          error: null,
        }));
      } else {
        setState((prev) => ({
          ...prev,
          companies: [],
          total: 0,
          totalPages: 0,
          loading: false,
          error: result.message,
        }));
      }
    };

    fetchCompanies();
  }, [filters]);

  // Action handlers
  const setSearchTerm = useCallback((term: string) => {
    setState((prev) => ({ ...prev, searchTerm: term, currentPage: 1 }));
  }, []);

  const setSubscriptionStatusFilter = useCallback(
    (filter: "all" | "active" | "expired" | "upcoming") => {
      setState((prev) => ({
        ...prev,
        subscriptionStatusFilter: filter,
        currentPage: 1,
      }));
    },
    []
  );

  const setSortField = useCallback((field: string | null) => {
    setState((prev) => ({ ...prev, sortField: field }));
  }, []);

  const setSortDirection = useCallback((direction: "ASC" | "DESC") => {
    setState((prev) => ({ ...prev, sortDirection: direction }));
  }, []);

  const setCurrentPage = useCallback((page: number) => {
    setState((prev) => ({ ...prev, currentPage: page }));
  }, []);

  const setItemsPerPage = useCallback((items: number) => {
    setState((prev) => ({ ...prev, itemsPerPage: items, currentPage: 1 }));
  }, []);

  const clearFilters = useCallback(() => {
    setState((prev) => ({
      ...prev,
      searchTerm: "",
      subscriptionStatusFilter: "all",
      currentPage: 1,
    }));
  }, []);

  const refreshData = useCallback(async () => {
    setState((prev) => ({ ...prev, loading: true, error: null }));

    const result = await service.getCompanies(filters);

    if (result.success && result.data) {
      const total = result.data.total ?? 0;
      const limit = result.data.limit ?? 10;

      setState((prev) => ({
        ...prev,
        companies: result.data.data ?? [],
        total,
        totalPages: Math.ceil(total / limit),
        loading: false,
        error: null,
      }));
    } else {
      setState((prev) => ({
        ...prev,
        companies: [],
        total: 0,
        totalPages: 0,
        loading: false,
        error: result.message,
      }));
    }
  }, [service, filters]);

  // CRUD operations
  const createCompany = useCallback(
    async (data: CreateCompanyData): Promise<boolean> => {
      const result = await service.createCompany(data);
      if (result.success) {
        await refreshData();
      }
      return result.success;
    },
    [service, refreshData]
  );

  const updateCompany = useCallback(
    async (data: UpdateCompanyData): Promise<boolean> => {
      const result = await service.updateCompany(data);
      if (result.success) {
        await refreshData();
      }
      return result.success;
    },
    [service, refreshData]
  );

  const deleteCompany = useCallback(
    async (id: string): Promise<boolean> => {
      const result = await service.deleteCompany(id);
      if (result.success) {
        await refreshData();
      }
      return result.success;
    },
    [service, refreshData]
  );

  const toggleCompanyStatus = useCallback(
    async (id: string): Promise<boolean> => {
      const result = await service.toggleCompanyStatus(id);
      if (result.success) {
        await refreshData();
      }
      return result.success;
    },
    [service, refreshData]
  );

  const getCompanyById = useCallback(
    async (id: string): Promise<Company | null> => {
      const result = await service.getCompanyById(id);
      return result.success && result.data ? result.data.data : null;
    },
    [service]
  );

  const actions: UseCompanyActions = {
    setSearchTerm,
    setSubscriptionStatusFilter,
    setSortField,
    setSortDirection,
    setCurrentPage,
    setItemsPerPage,
    clearFilters,
    refreshData,
    createCompany,
    updateCompany,
    deleteCompany,
    toggleCompanyStatus,
    getCompanyById,
  };

  return {
    ...state,
    loading: state.loading || service.loading,
    ...actions,
  };
}

export default useCompany;