import { useEffect, useState } from 'react';

import { zodResolver } from '@hookform/resolvers/zod';
import { Trans } from '@lingui/react/macro';
import { RecipientRole } from '@prisma/client';
import { useForm } from 'react-hook-form';
import { z } from 'zod';

import { AppError } from '@documenso/lib/errors/app-error';
import { DocumentAuth, type TRecipientActionAuth } from '@documenso/lib/types/document-auth';
import { Alert, AlertDescription, AlertTitle } from '@documenso/ui/primitives/alert';
import { Button } from '@documenso/ui/primitives/button';
import { DialogFooter } from '@documenso/ui/primitives/dialog';
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from '@documenso/ui/primitives/form/form';
import { PinInput, PinInputGroup, PinInputSlot } from '@documenso/ui/primitives/pin-input';

import { EnableAuthenticatorAppDialog } from '~/components/forms/2fa/enable-authenticator-app-dialog';

import { useRequiredDocumentSigningAuthContext } from './document-signing-auth-provider';

export type DocumentSigningAuth2FAProps = {
  actionTarget?: 'FIELD' | 'DOCUMENT';
  actionVerb?: string;
  open: boolean;
  onOpenChange: (value: boolean) => void;
  onReauthFormSubmit: (values?: TRecipientActionAuth) => Promise<void> | void;
};

const Z2FAAuthFormSchema = z.object({
  token: z
    .string()
    .min(4, { message: 'Token must at least 4 characters long' })
    .max(10, { message: 'Token must be at most 10 characters long' }),
});

type T2FAAuthFormSchema = z.infer<typeof Z2FAAuthFormSchema>;

export const DocumentSigningAuth2FA = ({
  actionTarget = 'FIELD',
  actionVerb = 'sign',
  onReauthFormSubmit,
  open,
  onOpenChange,
}: DocumentSigningAuth2FAProps) => {
  const { recipient, user, isCurrentlyAuthenticating, setIsCurrentlyAuthenticating } =
    useRequiredDocumentSigningAuthContext();

  const form = useForm<T2FAAuthFormSchema>({
    resolver: zodResolver(Z2FAAuthFormSchema),
    defaultValues: {
      token: '',
    },
  });

  const [is2FASetupSuccessful, setIs2FASetupSuccessful] = useState(false);
  const [formErrorCode, setFormErrorCode] = useState<string | null>(null);

  const onFormSubmit = async ({ token }: T2FAAuthFormSchema) => {
    try {
      setIsCurrentlyAuthenticating(true);

      await onReauthFormSubmit({
        type: DocumentAuth.TWO_FACTOR_AUTH,
        token,
      });

      setIsCurrentlyAuthenticating(false);

      onOpenChange(false);
    } catch (err) {
      setIsCurrentlyAuthenticating(false);

      const error = AppError.parseError(err);
      setFormErrorCode(error.code);

      // Todo: Alert.
    }
  };

  useEffect(() => {
    form.reset({
      token: '',
    });

    setIs2FASetupSuccessful(false);
    setFormErrorCode(null);

    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [open]);

  if (!user?.twoFactorEnabled && !is2FASetupSuccessful) {
    return (
      <div className="space-y-4">
        <Alert variant="warning">
          <AlertDescription>
            <p>
              {recipient.role === RecipientRole.VIEWER && actionTarget === 'DOCUMENT' ? (
                <Trans>You need to setup 2FA to mark this document as viewed.</Trans>
              ) : (
                // Todo: Translate
                `You need to setup 2FA to ${actionVerb.toLowerCase()} this ${actionTarget.toLowerCase()}.`
              )}
            </p>

            <p className="mt-2">
              <Trans>
                By enabling 2FA, you will be required to enter a code from your authenticator app
                every time you sign in using email password.
              </Trans>
            </p>
          </AlertDescription>
        </Alert>
        <DialogFooter>
          <Button type="button" variant="secondary" onClick={() => onOpenChange(false)}>
            <Trans>Close</Trans>
          </Button>

          <EnableAuthenticatorAppDialog onSuccess={() => setIs2FASetupSuccessful(true)} />
        </DialogFooter>
      </div>
    );
  }

  return (
    <Form {...form}>
      <form onSubmit={form.handleSubmit(onFormSubmit)}>
        <fieldset disabled={isCurrentlyAuthenticating}>
          <div className="space-y-4">
            <FormField
              control={form.control}
              name="token"
              render={({ field }) => (
                <FormItem>
                  <FormLabel required>2FA token</FormLabel>

                  <FormControl>
                    <PinInput {...field} value={field.value ?? ''} maxLength={6}>
                      {Array(6)
                        .fill(null)
                        .map((_, i) => (
                          <PinInputGroup key={i}>
                            <PinInputSlot index={i} />
                          </PinInputGroup>
                        ))}
                    </PinInput>
                  </FormControl>

                  <FormMessage />
                </FormItem>
              )}
            />

            {formErrorCode && (
              <Alert variant="destructive">
                <AlertTitle>
                  <Trans>Unauthorized</Trans>
                </AlertTitle>
                <AlertDescription>
                  <Trans>
                    We were unable to verify your details. Please try again or contact support
                  </Trans>
                </AlertDescription>
              </Alert>
            )}

            <DialogFooter>
              <Button type="button" variant="secondary" onClick={() => onOpenChange(false)}>
                <Trans>Cancel</Trans>
              </Button>

              <Button type="submit" loading={isCurrentlyAuthenticating}>
                <Trans>Sign</Trans>
              </Button>
            </DialogFooter>
          </div>
        </fieldset>
      </form>
    </Form>
  );
};