'use client';

import { useState, useCallback } from 'react';
import { useRouter, useSearchParams } from 'next/navigation';
import { AdminUsersTemplate } from '@/templates/AdminUsersTemplate';
import { AdminUsersViewData } from '@/lib/view-data/AdminUsersViewData';
import { updateUserStatus, deleteUser } from '@/app/actions/adminActions';
import { routes } from '@/lib/routing/RouteConfig';
import { ConfirmDialog } from '@/ui/ConfirmDialog';

interface AdminUsersWrapperProps {
  initialViewData: AdminUsersViewData;
}

export function AdminUsersWrapper({ initialViewData }: AdminUsersWrapperProps) {
  const router = useRouter();
  const searchParams = useSearchParams();

  // UI state (not business logic)
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [deletingUser, setDeletingUser] = useState<string | null>(null);
  const [userToDelete, setUserToDelete] = useState<string | null>(null);
  const [selectedUserIds, setSelectedUserIds] = useState<string[]>([]);

  // Current filter values from URL
  const search = searchParams.get('search') || '';
  const roleFilter = searchParams.get('role') || '';
  const statusFilter = searchParams.get('status') || '';

  // Selection handlers
  const handleSelectUser = useCallback((userId: string) => {
    setSelectedUserIds(prev => 
      prev.includes(userId) 
        ? prev.filter(id => id !== userId) 
        : [...prev, userId]
    );
  }, []);

  const handleSelectAll = useCallback(() => {
    if (selectedUserIds.length === initialViewData.users.length) {
      setSelectedUserIds([]);
    } else {
      setSelectedUserIds(initialViewData.users.map(u => u.id));
    }
  }, [selectedUserIds.length, initialViewData.users]);

  const handleClearSelection = useCallback(() => {
    setSelectedUserIds([]);
  }, []);

  // Callbacks that update URL (triggers RSC re-render)
  const handleSearch = useCallback((newSearch: string) => {
    const params = new URLSearchParams(searchParams);
    if (newSearch) params.set('search', newSearch);
    else params.delete('search');
    params.delete('page'); // Reset to page 1
    router.push(`${routes.admin.users}?${params.toString()}`);
  }, [router, searchParams]);

  const handleFilterRole = useCallback((role: string) => {
    const params = new URLSearchParams(searchParams);
    if (role) params.set('role', role);
    else params.delete('role');
    params.delete('page');
    router.push(`${routes.admin.users}?${params.toString()}`);
  }, [router, searchParams]);

  const handleFilterStatus = useCallback((status: string) => {
    const params = new URLSearchParams(searchParams);
    if (status) params.set('status', status);
    else params.delete('status');
    params.delete('page');
    router.push(`${routes.admin.users}?${params.toString()}`);
  }, [router, searchParams]);

  const handleClearFilters = useCallback(() => {
    router.push(routes.admin.users);
  }, [router]);

  const handleRefresh = useCallback(() => {
    router.refresh();
  }, [router]);

  // Mutation callbacks (call Server Actions)
  const handleUpdateStatus = useCallback(async (userId: string, newStatus: string) => {
    try {
      setLoading(true);
      const result = await updateUserStatus(userId, newStatus);

      if (result.isErr()) {
        setError(result.getError());
        return;
      }

      // Revalidate data
      router.refresh();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to update status');
    } finally {
      setLoading(false);
    }
  }, [router]);

  const handleDeleteUser = useCallback(async (userId: string) => {
    setUserToDelete(userId);
  }, []);

  const confirmDeleteUser = useCallback(async () => {
    if (!userToDelete) return;

    try {
      setDeletingUser(userToDelete);
      setError(null);
      const result = await deleteUser(userToDelete);

      if (result.isErr()) {
        setError(result.getError());
        return;
      }

      // Revalidate data
      router.refresh();
      setUserToDelete(null);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to delete user');
    } finally {
      setDeletingUser(null);
    }
  }, [router, userToDelete]);

  return (
    <>
      <AdminUsersTemplate
        viewData={initialViewData}
        onRefresh={handleRefresh}
        onSearch={handleSearch}
        onFilterRole={handleFilterRole}
        onFilterStatus={handleFilterStatus}
        onClearFilters={handleClearFilters}
        onUpdateStatus={handleUpdateStatus}
        onDeleteUser={handleDeleteUser}
        search={search}
        roleFilter={roleFilter}
        statusFilter={statusFilter}
        loading={loading}
        error={error}
        deletingUser={deletingUser}
        selectedUserIds={selectedUserIds}
        onSelectUser={handleSelectUser}
        onSelectAll={handleSelectAll}
        onClearSelection={handleClearSelection}
      />
      <ConfirmDialog
        isOpen={!!userToDelete}
        onClose={() => setUserToDelete(null)}
        onConfirm={confirmDeleteUser}
        title="Delete User"
        description="Are you sure you want to delete this user? This action cannot be undone and will permanently remove the user's access."
        confirmLabel="Delete User"
        variant="danger"
        isLoading={!!deletingUser}
      />
    </>
  );
}
