import type { ActionFunctionArgs, LoaderFunctionArgs, MetaFunction } from "@remix-run/node";
import { json, redirect } from "@remix-run/node";
import { Form, Link, useActionData, useSearchParams } from "@remix-run/react";
import { createUserSession, getUserId, verifyLogin } from "~/utils/auth.server";

export const meta: MetaFunction = () => [{ title: "Sign In - Alhaffer Report System" }];

export const loader = async ({ request }: LoaderFunctionArgs) => {
  const userId = await getUserId(request);
  if (userId) return redirect("/dashboard");
  return json({});
};

export const action = async ({ request }: ActionFunctionArgs) => {
  const formData = await request.formData();
  const usernameOrEmail = formData.get("usernameOrEmail");
  const password = formData.get("password");
  const redirectTo = formData.get("redirectTo") || "/dashboard";

  if (typeof usernameOrEmail !== "string" || typeof password !== "string" || typeof redirectTo !== "string") {
    return json({ errors: { form: "Form not submitted correctly." } }, { status: 400 });
  }

  if (usernameOrEmail.length === 0) {
    return json({ errors: { usernameOrEmail: "Username or email is required" } }, { status: 400 });
  }

  if (password.length === 0) {
    return json({ errors: { password: "Password is required" } }, { status: 400 });
  }

  const user = await verifyLogin(usernameOrEmail, password);

  if (!user) {
    return json({ errors: { form: "Invalid username/email or password" } }, { status: 400 });
  }

  return createUserSession(user.id, redirectTo);
};

export default function SignIn() {
  const [searchParams] = useSearchParams();
  const redirectTo = searchParams.get("redirectTo") || "/dashboard";
  const message = searchParams.get("message");
  const actionData = useActionData<typeof action>();

  return (
    <div className="min-h-screen bg-gradient-to-br from-blue-50 to-indigo-100 flex items-center justify-center py-8 px-4 sm:py-12 sm:px-6 lg:px-8">
      <div className="max-w-md w-full space-y-6 sm:space-y-8">
        <div className="text-center">
          <img
            className="mx-auto h-20 sm:h-28 w-auto"
            src="/clogo-sm.png"
            alt="Phosphat Report"
          />
          <h2 className="mt-4 sm:mt-6 text-2xl sm:text-3xl font-extrabold text-gray-900">
            Sign in to your account
          </h2>
          <p className="mt-2 text-sm text-gray-600">
            Or{" "}
            <Link
              to="/signup"
              className="font-medium text-indigo-600 hover:text-indigo-500"
            >
              create a new account
            </Link>
          </p>
        </div>
        
        {message && (
          <div className="p-4 bg-green-50 border border-green-200 rounded-md">
            <p className="text-green-800 text-sm">{message}</p>
          </div>
        )}
        
        <Form method="post" className="mt-8 space-y-6">
          <input type="hidden" name="redirectTo" value={redirectTo} />
          
          <div className="rounded-md shadow-sm -space-y-px">
            <div>
              <label htmlFor="usernameOrEmail" className="sr-only">
                Username or Email
              </label>
              <input
                id="usernameOrEmail"
                name="usernameOrEmail"
                type="text"
                autoComplete="username"
                required
                className="appearance-none rounded-none relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-t-md focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
                placeholder="Username or Email"
              />
              {actionData?.errors?.usernameOrEmail && (
                <div className="text-red-500 text-sm mt-1">{actionData.errors.usernameOrEmail}</div>
              )}
            </div>
            
            <div>
              <label htmlFor="password" className="sr-only">
                Password
              </label>
              <input
                id="password"
                name="password"
                type="password"
                autoComplete="current-password"
                required
                className="appearance-none rounded-none relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-b-md focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
                placeholder="Password"
              />
              {actionData?.errors?.password && (
                <div className="text-red-500 text-sm mt-1">{actionData.errors.password}</div>
              )}
            </div>
          </div>

          <div className="flex items-center justify-end">
            <div className="text-sm">
              <Link
                to="/reset-password"
                className="font-medium text-indigo-600 hover:text-indigo-500"
              >
                Forgot your password?
              </Link>
            </div>
          </div>

          <div>
            <button
              type="submit"
              className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-md text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500"
            >
              Sign in
            </button>

          </div>
          {actionData?.errors?.form && (
            <div className="text-red-500 text-sm text-center">{actionData.errors.form}</div>
          )}
        </Form>
      </div>
    </div>
  );
}