import { useState, useMemo } from 'react';
import { useUsers } from '../context/UsersContext';

const DEFAULT_SEARCH_FIELDS = ['first_name', 'last_name', 'email'];

/**
 * Base hook that adds search and filter functionality to any user list
 */
const useFilteredUsers = ({
  users,
  initialFilter = 'all',
  filterKey = 'status',
  searchFields = DEFAULT_SEARCH_FIELDS,
  searchAccessor,
}) => {
  const [searchQuery, setSearchQuery] = useState('');
  const [filterValue, setFilterValue] = useState(initialFilter);

  const filteredUsers = useMemo(() => {
    let filtered = users;

    // Apply filter
    if (filterValue && filterValue !== 'all') {
      filtered = filtered.filter(user => user[filterKey] === filterValue);
    }

    // Apply search
    if (searchQuery) {
      const query = searchQuery.toLowerCase();
      filtered = filtered.filter(user => {
        const values = typeof searchAccessor === 'function'
          ? searchAccessor(user)
          : searchFields.map(field => user?.[field]);

        return values
          .filter(Boolean)
          .some(value => value.toString().toLowerCase().includes(query));
      });
    }

    return filtered;
  }, [users, searchQuery, filterKey, filterValue, searchAccessor, searchFields]);

  return {
    filteredUsers,
    searchQuery,
    setSearchQuery,
    filterValue,
    setFilterValue,
  };
};

/**
 * Hook for staff users (admin, superadmin, finance roles)
 */
export const useStaff = ({
  initialFilter = 'all',
  filterKey = 'role',
  searchFields = DEFAULT_SEARCH_FIELDS,
  searchAccessor,
} = {}) => {
  const { staff, loading, error, refetch, updateUser, removeUser } = useUsers();

  const {
    filteredUsers,
    searchQuery,
    setSearchQuery,
    filterValue,
    setFilterValue,
  } = useFilteredUsers({
    users: staff,
    initialFilter,
    filterKey,
    searchFields,
    searchAccessor,
  });

  return {
    users: staff,
    filteredUsers,
    loading,
    error,
    searchQuery,
    setSearchQuery,
    filterValue,
    setFilterValue,
    refetch,
    updateUser,
    removeUser,
  };
};

/**
 * Hook for member users (non-admin roles)
 */
export const useMembers = ({
  initialFilter = 'active',
  filterKey = 'status',
  searchFields = DEFAULT_SEARCH_FIELDS,
  searchAccessor,
} = {}) => {
  const { members, loading, error, refetch, updateUser, removeUser } = useUsers();

  const {
    filteredUsers,
    searchQuery,
    setSearchQuery,
    filterValue,
    setFilterValue,
  } = useFilteredUsers({
    users: members,
    initialFilter,
    filterKey,
    searchFields,
    searchAccessor,
  });

  return {
    users: members,
    filteredUsers,
    loading,
    error,
    searchQuery,
    setSearchQuery,
    filterValue,
    setFilterValue,
    refetch,
    updateUser,
    removeUser,
  };
};

/**
 * Hook for all users (both staff and members)
 */
export const useAllUsers = ({
  initialFilter = 'all',
  filterKey = 'status',
  searchFields = DEFAULT_SEARCH_FIELDS,
  searchAccessor,
} = {}) => {
  const { users, loading, error, refetch, updateUser, removeUser } = useUsers();

  const {
    filteredUsers,
    searchQuery,
    setSearchQuery,
    filterValue,
    setFilterValue,
  } = useFilteredUsers({
    users,
    initialFilter,
    filterKey,
    searchFields,
    searchAccessor,
  });

  return {
    users,
    filteredUsers,
    loading,
    error,
    searchQuery,
    setSearchQuery,
    filterValue,
    setFilterValue,
    refetch,
    updateUser,
    removeUser,
  };
};