'use client';

import { useState } from 'react';

import { zodResolver } from '@hookform/resolvers/zod';
import { Eye, EyeOff } from 'lucide-react';
import { signIn } from 'next-auth/react';
import { useForm } from 'react-hook-form';
import { FcGoogle } from 'react-icons/fc';
import { z } from 'zod';

import { ErrorCode, isErrorCode } from '@documenso/lib/next-auth/error-codes';
import { cn } from '@documenso/ui/lib/utils';
import { Button } from '@documenso/ui/primitives/button';
import { FormErrorMessage } from '@documenso/ui/primitives/form/form-error-message';
import { Input } from '@documenso/ui/primitives/input';
import { Label } from '@documenso/ui/primitives/label';
import { useToast } from '@documenso/ui/primitives/use-toast';

const ERROR_MESSAGES = {
  [ErrorCode.CREDENTIALS_NOT_FOUND]: 'The email or password provided is incorrect',
  [ErrorCode.INCORRECT_EMAIL_PASSWORD]: 'The email or password provided is incorrect',
  [ErrorCode.USER_MISSING_PASSWORD]:
    'This account appears to be using a social login method, please sign in using that method',
};

const LOGIN_REDIRECT_PATH = '/documents';

export const ZSignInFormSchema = z.object({
  email: z.string().email().min(1),
  password: z.string().min(6).max(72),
});

export type TSignInFormSchema = z.infer<typeof ZSignInFormSchema>;

export type SignInFormProps = {
  className?: string;
};

export const SignInForm = ({ className }: SignInFormProps) => {
  const { toast } = useToast();
  const [showPassword, setShowPassword] = useState(false);

  const {
    register,
    handleSubmit,
    formState: { errors, isSubmitting },
  } = useForm<TSignInFormSchema>({
    values: {
      email: '',
      password: '',
    },
    resolver: zodResolver(ZSignInFormSchema),
  });

  const onFormSubmit = async ({ email, password }: TSignInFormSchema) => {
    try {
      const result = await signIn('credentials', {
        email,
        password,
        callbackUrl: LOGIN_REDIRECT_PATH,
        redirect: false,
      });

      if (result?.error && isErrorCode(result.error)) {
        toast({
          variant: 'destructive',
          description: ERROR_MESSAGES[result.error],
        });

        return;
      }

      if (!result?.url) {
        throw new Error('An unknown error occurred');
      }

      window.location.href = result.url;
    } catch (err) {
      toast({
        title: 'An unknown error occurred',
        description:
          'We encountered an unknown error while attempting to sign you In. Please try again later.',
      });
    }
  };

  const onSignInWithGoogleClick = async () => {
    try {
      await signIn('google', { callbackUrl: LOGIN_REDIRECT_PATH });
    } catch (err) {
      toast({
        title: 'An unknown error occurred',
        description:
          'We encountered an unknown error while attempting to sign you In. Please try again later.',
        variant: 'destructive',
      });
    }
  };

  return (
    <form
      className={cn('flex w-full flex-col gap-y-4', className)}
      onSubmit={handleSubmit(onFormSubmit)}
    >
      <div>
        <Label htmlFor="email" className="text-muted-forground">
          Email
        </Label>

        <Input id="email" type="email" className="bg-background mt-2" {...register('email')} />

        <FormErrorMessage className="mt-1.5" error={errors.email} />
      </div>

      <div>
        <Label htmlFor="password" className="text-muted-forground">
          <span>Password</span>
        </Label>

        <div className="relative">
          <Input
            id="password"
            type={showPassword ? 'text' : 'password'}
            minLength={6}
            maxLength={72}
            autoComplete="current-password"
            className="bg-background mt-2 pr-10"
            {...register('password')}
          />

          <Button
            variant="link"
            type="button"
            className="absolute right-0 top-0 flex h-full items-center justify-center pr-3"
            aria-label={showPassword ? 'Mask password' : 'Reveal password'}
            onClick={() => setShowPassword((show) => !show)}
          >
            {showPassword ? (
              <EyeOff className="text-muted-foreground h-5 w-5" />
            ) : (
              <Eye className="text-muted-foreground h-5 w-5" />
            )}
          </Button>
        </div>

        <FormErrorMessage className="mt-1.5" error={errors.password} />
      </div>

      <Button
        size="lg"
        loading={isSubmitting}
        disabled={isSubmitting}
        className="dark:bg-documenso dark:hover:opacity-90"
      >
        {isSubmitting ? 'Signing in...' : 'Sign In'}
      </Button>

      <div className="relative flex items-center justify-center gap-x-4 py-2 text-xs uppercase">
        <div className="bg-border h-px flex-1" />
        <span className="text-muted-foreground bg-transparent">Or continue with</span>
        <div className="bg-border h-px flex-1" />
      </div>

      <Button
        type="button"
        size="lg"
        variant={'outline'}
        className="bg-background text-muted-foreground border"
        disabled={isSubmitting}
        onClick={onSignInWithGoogleClick}
      >
        <FcGoogle className="mr-2 h-5 w-5" />
        Google
      </Button>
    </form>
  );
};