import type { ActionArgs, LoaderArgs, MetaFunction } from '@remix-run/node'
import { json, redirect } from '@remix-run/node'
import { Form, Link, useActionData, useSearchParams } from '@remix-run/react'
import * as React from 'react'

import { verifyLogin } from '~/models/user.server'
import { createUserSession, getUserId } from '~/session.server'
import { safeRedirect, validateEmail } from '~/utils'

export async function loader({ request }: LoaderArgs) {
  const userId = await getUserId(request)
  if (userId) return redirect('/')
  return json({})
}

export async function action({ request }: ActionArgs) {
  const formData = await request.formData()
  const email = formData.get('email')
  const password = formData.get('password')
  const redirectTo = safeRedirect(formData.get('redirectTo'), '/')
  const remember = formData.get('remember')

  if (!validateEmail(email)) {
    return json({ errors: { email: 'Email is invalid', password: null } }, { status: 400 })
  }

  if (typeof password !== 'string' || password.length === 0) {
    return json({ errors: { password: 'Password is required', email: null } }, { status: 400 })
  }

  if (password.length < 8) {
    return json({ errors: { password: 'Password is too short', email: null } }, { status: 400 })
  }

  const user = await verifyLogin(email, password)

  if (!user) {
    return json({ errors: { email: 'Invalid email or password', password: null } }, { status: 400 })
  }

  return createUserSession({
    request,
    userId: user.id,
    remember: remember === 'on' ? true : false,
    redirectTo
  })
}

export const meta: MetaFunction = () => {
  return {
    title: 'Login'
  }
}

export default function LoginPage() {
  const [searchParams] = useSearchParams()
  const redirectTo = searchParams.get('redirectTo') || '/notes'
  const actionData = useActionData<typeof action>()
  const emailRef = React.useRef<HTMLInputElement>(null)
  const passwordRef = React.useRef<HTMLInputElement>(null)

  React.useEffect(() => {
    if (actionData?.errors?.email) {
      emailRef.current?.focus()
    } else if (actionData?.errors?.password) {
      passwordRef.current?.focus()
    }
  }, [actionData])

  return (
    <div className="flex min-h-full flex-col justify-center">
      <div className="mx-auto w-full max-w-md px-8">
        <Form method="post" className="space-y-6" noValidate>
          <div>
            <label htmlFor="email" className="block text-sm font-medium text-gray-700">
              Email address
            </label>
            <div className="mt-1">
              <input
                ref={emailRef}
                id="email"
                required
                autoFocus={true}
                name="email"
                type="email"
                autoComplete="email"
                aria-invalid={actionData?.errors?.email ? true : undefined}
                aria-describedby="email-error"
                className="w-full rounded border border-gray-500 px-2 py-1 text-lg"
              />
              {actionData?.errors?.email && (
                <div className="pt-1 text-red-700" id="email-error">
                  {actionData.errors.email}
                </div>
              )}
            </div>
          </div>

          <div>
            <label htmlFor="password" className="block text-sm font-medium text-gray-700">
              Password
            </label>
            <div className="mt-1">
              <input
                id="password"
                ref={passwordRef}
                name="password"
                type="password"
                autoComplete="current-password"
                aria-invalid={actionData?.errors?.password ? true : undefined}
                aria-describedby="password-error"
                className="w-full rounded border border-gray-500 px-2 py-1 text-lg"
              />
              {actionData?.errors?.password && (
                <div className="pt-1 text-red-700" id="password-error">
                  {actionData.errors.password}
                </div>
              )}
            </div>
          </div>

          <input type="hidden" name="redirectTo" value={redirectTo} />
          <button
            type="submit"
            className="w-full rounded bg-blue-500  py-2 px-4 text-white hover:bg-blue-600 focus:bg-blue-400"
          >
            Log in
          </button>
          <div className="flex items-center justify-between">
            <div className="flex items-center">
              <input
                id="remember"
                name="remember"
                type="checkbox"
                className="h-4 w-4 rounded border-gray-300 text-blue-600 focus:ring-blue-500"
              />
              <label htmlFor="remember" className="ml-2 block text-sm text-gray-900">
                Remember me
              </label>
            </div>
          </div>
        </Form>
      </div>
    </div>
  )
}