import { useMemo, useState } from 'react';

import { zodResolver } from '@hookform/resolvers/zod';
import { Trans } from '@lingui/react/macro';
import type { Field, Recipient } from '@prisma/client';
import { RecipientRole } from '@prisma/client';
import { useForm } from 'react-hook-form';
import { match } from 'ts-pattern';
import { z } from 'zod';

import { AppError, AppErrorCode } from '@documenso/lib/errors/app-error';
import {
  type TRecipientAccessAuth,
  ZDocumentAccessAuthSchema,
} from '@documenso/lib/types/document-auth';
import { fieldsContainUnsignedRequiredField } from '@documenso/lib/utils/advanced-fields-helpers';
import { Button } from '@documenso/ui/primitives/button';
import {
  Dialog,
  DialogContent,
  DialogFooter,
  DialogTitle,
  DialogTrigger,
} from '@documenso/ui/primitives/dialog';
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from '@documenso/ui/primitives/form/form';
import { Input } from '@documenso/ui/primitives/input';

import { AccessAuth2FAForm } from '~/components/general/document-signing/access-auth-2fa-form';
import { DocumentSigningDisclosure } from '~/components/general/document-signing/document-signing-disclosure';

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

export type DocumentSigningCompleteDialogProps = {
  isSubmitting: boolean;
  documentTitle: string;
  fields: Field[];
  fieldsValidated: () => void | Promise<void>;
  onSignatureComplete: (
    nextSigner?: { name: string; email: string },
    accessAuthOptions?: TRecipientAccessAuth,
  ) => void | Promise<void>;
  recipient: Pick<Recipient, 'name' | 'email' | 'role' | 'token'>;
  disabled?: boolean;
  allowDictateNextSigner?: boolean;
  defaultNextSigner?: {
    name: string;
    email: string;
  };
};

const ZNextSignerFormSchema = z.object({
  name: z.string().min(1, 'Name is required'),
  email: z.string().email('Invalid email address'),
  accessAuthOptions: ZDocumentAccessAuthSchema.optional(),
});

type TNextSignerFormSchema = z.infer<typeof ZNextSignerFormSchema>;

export const DocumentSigningCompleteDialog = ({
  isSubmitting,
  documentTitle,
  fields,
  fieldsValidated,
  onSignatureComplete,
  recipient,
  disabled = false,
  allowDictateNextSigner = false,
  defaultNextSigner,
}: DocumentSigningCompleteDialogProps) => {
  const [showDialog, setShowDialog] = useState(false);
  const [isEditingNextSigner, setIsEditingNextSigner] = useState(false);

  const [showTwoFactorForm, setShowTwoFactorForm] = useState(false);
  const [twoFactorValidationError, setTwoFactorValidationError] = useState<string | null>(null);

  const { derivedRecipientAccessAuth, user } = useRequiredDocumentSigningAuthContext();

  const form = useForm<TNextSignerFormSchema>({
    resolver: allowDictateNextSigner ? zodResolver(ZNextSignerFormSchema) : undefined,
    defaultValues: {
      name: defaultNextSigner?.name ?? '',
      email: defaultNextSigner?.email ?? '',
    },
  });

  const isComplete = useMemo(() => !fieldsContainUnsignedRequiredField(fields), [fields]);

  const completionRequires2FA = useMemo(
    () => derivedRecipientAccessAuth.includes('TWO_FACTOR_AUTH'),
    [derivedRecipientAccessAuth],
  );

  const handleOpenChange = (open: boolean) => {
    if (form.formState.isSubmitting || !isComplete) {
      return;
    }

    if (open) {
      form.reset({
        name: defaultNextSigner?.name ?? '',
        email: defaultNextSigner?.email ?? '',
      });
    }

    setIsEditingNextSigner(false);
    setShowDialog(open);
  };

  const onFormSubmit = async (data: TNextSignerFormSchema) => {
    try {
      // Check if 2FA is required
      if (completionRequires2FA && !data.accessAuthOptions) {
        setShowTwoFactorForm(true);
        return;
      }

      const nextSigner =
        allowDictateNextSigner && data.name && data.email
          ? { name: data.name, email: data.email }
          : undefined;

      await onSignatureComplete(nextSigner, data.accessAuthOptions);
    } catch (error) {
      const err = AppError.parseError(error);

      if (AppErrorCode.TWO_FACTOR_AUTH_FAILED === err.code) {
        // This was a 2FA validation failure - show the 2FA dialog again with error
        form.setValue('accessAuthOptions', undefined);

        setTwoFactorValidationError('Invalid verification code. Please try again.');
        setShowTwoFactorForm(true);

        return;
      }
    }
  };

  const onTwoFactorFormSubmit = (validatedAuthOptions: TRecipientAccessAuth) => {
    form.setValue('accessAuthOptions', validatedAuthOptions);

    setShowTwoFactorForm(false);
    setTwoFactorValidationError(null);

    // Now trigger the form submission with auth options
    void form.handleSubmit(onFormSubmit)();
  };

  const isNextSignerValid = !allowDictateNextSigner || (form.watch('name') && form.watch('email'));

  return (
    <Dialog open={showDialog} onOpenChange={handleOpenChange}>
      <DialogTrigger asChild>
        <Button
          className="w-full"
          type="button"
          size="lg"
          onClick={fieldsValidated}
          loading={isSubmitting}
          disabled={disabled}
        >
          {match({ isComplete, role: recipient.role })
            .with({ isComplete: false }, () => <Trans>Next field</Trans>)
            .with({ isComplete: true, role: RecipientRole.APPROVER }, () => <Trans>Approve</Trans>)
            .with({ isComplete: true, role: RecipientRole.VIEWER }, () => (
              <Trans>Mark as viewed</Trans>
            ))
            .with({ isComplete: true }, () => <Trans>Complete</Trans>)
            .exhaustive()}
        </Button>
      </DialogTrigger>

      <DialogContent>
        {!showTwoFactorForm && (
          <Form {...form}>
            <form onSubmit={form.handleSubmit(onFormSubmit)}>
              <fieldset disabled={form.formState.isSubmitting} className="border-none p-0">
                <DialogTitle>
                  <div className="text-foreground text-xl font-semibold">
                    {match(recipient.role)
                      .with(RecipientRole.VIEWER, () => <Trans>Complete Viewing</Trans>)
                      .with(RecipientRole.SIGNER, () => <Trans>Complete Signing</Trans>)
                      .with(RecipientRole.APPROVER, () => <Trans>Complete Approval</Trans>)
                      .with(RecipientRole.CC, () => <Trans>Complete Viewing</Trans>)
                      .with(RecipientRole.ASSISTANT, () => <Trans>Complete Assisting</Trans>)
                      .exhaustive()}
                  </div>
                </DialogTitle>

                <div className="text-muted-foreground max-w-[50ch]">
                  {match(recipient.role)
                    .with(RecipientRole.VIEWER, () => (
                      <span>
                        <Trans>
                          <span className="inline-flex flex-wrap">
                            You are about to complete viewing "
                            <span className="inline-block max-w-[11rem] truncate align-baseline">
                              {documentTitle}
                            </span>
                            ".
                          </span>
                          <br /> Are you sure?
                        </Trans>
                      </span>
                    ))
                    .with(RecipientRole.SIGNER, () => (
                      <span>
                        <Trans>
                          <span className="inline-flex flex-wrap">
                            You are about to complete signing "
                            <span className="inline-block max-w-[11rem] truncate align-baseline">
                              {documentTitle}
                            </span>
                            ".
                          </span>
                          <br /> Are you sure?
                        </Trans>
                      </span>
                    ))
                    .with(RecipientRole.APPROVER, () => (
                      <span>
                        <Trans>
                          <span className="inline-flex flex-wrap">
                            You are about to complete approving{' '}
                            <span className="inline-block max-w-[11rem] truncate align-baseline">
                              "{documentTitle}"
                            </span>
                            .
                          </span>
                          <br /> Are you sure?
                        </Trans>
                      </span>
                    ))
                    .otherwise(() => (
                      <span>
                        <Trans>
                          <span className="inline-flex flex-wrap">
                            You are about to complete viewing "
                            <span className="inline-block max-w-[11rem] truncate align-baseline">
                              {documentTitle}
                            </span>
                            ".
                          </span>
                          <br /> Are you sure?
                        </Trans>
                      </span>
                    ))}
                </div>

                {allowDictateNextSigner && (
                  <div className="mt-4 flex flex-col gap-4">
                    {!isEditingNextSigner && (
                      <div>
                        <p className="text-muted-foreground text-sm">
                          The next recipient to sign this document will be{' '}
                          <span className="font-semibold">{form.watch('name')}</span> (
                          <span className="font-semibold">{form.watch('email')}</span>).
                        </p>

                        <Button
                          type="button"
                          className="mt-2"
                          variant="outline"
                          size="sm"
                          onClick={() => setIsEditingNextSigner((prev) => !prev)}
                        >
                          <Trans>Update Recipient</Trans>
                        </Button>
                      </div>
                    )}

                    {isEditingNextSigner && (
                      <div className="flex flex-col gap-4 md:flex-row">
                        <FormField
                          control={form.control}
                          name="name"
                          render={({ field }) => (
                            <FormItem className="flex-1">
                              <FormLabel>
                                <Trans>Name</Trans>
                              </FormLabel>
                              <FormControl>
                                <Input
                                  {...field}
                                  className="mt-2"
                                  placeholder="Enter the next signer's name"
                                />
                              </FormControl>

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

                        <FormField
                          control={form.control}
                          name="email"
                          render={({ field }) => (
                            <FormItem className="flex-1">
                              <FormLabel>
                                <Trans>Email</Trans>
                              </FormLabel>
                              <FormControl>
                                <Input
                                  {...field}
                                  type="email"
                                  className="mt-2"
                                  placeholder="Enter the next signer's email"
                                />
                              </FormControl>
                              <FormMessage />
                            </FormItem>
                          )}
                        />
                      </div>
                    )}
                  </div>
                )}

                <DocumentSigningDisclosure className="mt-4" />

                <DialogFooter className="mt-4">
                  <div className="flex w-full flex-1 flex-nowrap gap-4">
                    <Button
                      type="button"
                      className="flex-1"
                      variant="secondary"
                      onClick={() => setShowDialog(false)}
                      disabled={form.formState.isSubmitting}
                    >
                      <Trans>Cancel</Trans>
                    </Button>

                    <Button
                      type="submit"
                      className="flex-1"
                      disabled={!isComplete || !isNextSignerValid}
                      loading={form.formState.isSubmitting}
                    >
                      {match(recipient.role)
                        .with(RecipientRole.VIEWER, () => <Trans>Mark as Viewed</Trans>)
                        .with(RecipientRole.SIGNER, () => <Trans>Sign</Trans>)
                        .with(RecipientRole.APPROVER, () => <Trans>Approve</Trans>)
                        .with(RecipientRole.CC, () => <Trans>Mark as Viewed</Trans>)
                        .with(RecipientRole.ASSISTANT, () => <Trans>Complete</Trans>)
                        .exhaustive()}
                    </Button>
                  </div>
                </DialogFooter>
              </fieldset>
            </form>
          </Form>
        )}

        {showTwoFactorForm && (
          <AccessAuth2FAForm
            token={recipient.token}
            error={twoFactorValidationError}
            onSubmit={onTwoFactorFormSubmit}
          />
        )}
      </DialogContent>
    </Dialog>
  );
};