import { useId, useMemo, useState } from 'react';

import { msg } from '@lingui/core/macro';
import { useLingui } from '@lingui/react';
import { Trans } from '@lingui/react/macro';
import { type Field, FieldType, type Recipient, RecipientRole } from '@prisma/client';
import { Controller, useForm } from 'react-hook-form';
import { useNavigate } from 'react-router';

import type { DocumentAndSender } from '@documenso/lib/server-only/document/get-document-by-token';
import type { TRecipientAccessAuth } from '@documenso/lib/types/document-auth';
import { isFieldUnsignedAndRequired } from '@documenso/lib/utils/advanced-fields-helpers';
import { sortFieldsByPosition } from '@documenso/lib/utils/fields';
import type { RecipientWithFields } from '@documenso/prisma/types/recipient-with-fields';
import { FieldToolTip } from '@documenso/ui/components/field/field-tooltip';
import { Button } from '@documenso/ui/primitives/button';
import { Input } from '@documenso/ui/primitives/input';
import { Label } from '@documenso/ui/primitives/label';
import { RadioGroup, RadioGroupItem } from '@documenso/ui/primitives/radio-group';
import { SignaturePadDialog } from '@documenso/ui/primitives/signature-pad/signature-pad-dialog';
import { useToast } from '@documenso/ui/primitives/use-toast';

import {
  AssistantConfirmationDialog,
  type NextSigner,
} from '../../dialogs/assistant-confirmation-dialog';
import { DocumentSigningCompleteDialog } from './document-signing-complete-dialog';
import { useRequiredDocumentSigningContext } from './document-signing-provider';

export type DocumentSigningFormProps = {
  document: DocumentAndSender;
  recipient: Recipient;
  fields: Field[];
  isRecipientsTurn: boolean;
  allRecipients?: RecipientWithFields[];
  setSelectedSignerId?: (id: number | null) => void;
  completeDocument: (options: {
    accessAuthOptions?: TRecipientAccessAuth;
    nextSigner?: { email: string; name: string };
  }) => Promise<void>;
  isSubmitting: boolean;
  fieldsValidated: () => void;
  nextRecipient?: RecipientWithFields;
};

export const DocumentSigningForm = ({
  document,
  recipient,
  fields,
  isRecipientsTurn,
  allRecipients = [],
  setSelectedSignerId,
  completeDocument,
  isSubmitting,
  fieldsValidated,
  nextRecipient,
}: DocumentSigningFormProps) => {
  const { _ } = useLingui();
  const { toast } = useToast();
  const navigate = useNavigate();

  const assistantSignersId = useId();

  const { fullName, signature, setFullName, setSignature } = useRequiredDocumentSigningContext();

  const [validateUninsertedFields, setValidateUninsertedFields] = useState(false);
  const [isConfirmationDialogOpen, setIsConfirmationDialogOpen] = useState(false);
  const [isAssistantSubmitting, setIsAssistantSubmitting] = useState(false);

  const assistantForm = useForm<{ selectedSignerId: number | undefined }>({
    defaultValues: {
      selectedSignerId: undefined,
    },
  });

  const fieldsRequiringValidation = useMemo(
    () => fields.filter(isFieldUnsignedAndRequired),
    [fields],
  );

  const hasSignatureField = fields.some((field) => field.type === FieldType.SIGNATURE);

  const uninsertedFields = useMemo(() => {
    return sortFieldsByPosition(fieldsRequiringValidation.filter((field) => !field.inserted));
  }, [fieldsRequiringValidation]);

  const uninsertedRecipientFields = useMemo(() => {
    return fieldsRequiringValidation.filter((field) => field.recipientId === recipient.id);
  }, [fieldsRequiringValidation, recipient]);

  const localFieldsValidated = () => {
    setValidateUninsertedFields(true);
    fieldsValidated();
  };

  const onAssistantFormSubmit = () => {
    if (uninsertedRecipientFields.length > 0) {
      return;
    }

    setIsConfirmationDialogOpen(true);
  };

  const handleAssistantConfirmDialogSubmit = async (nextSigner?: NextSigner) => {
    setIsAssistantSubmitting(true);

    try {
      await completeDocument({ nextSigner });
    } catch (err) {
      toast({
        title: 'Error',
        description: 'An error occurred while completing the document. Please try again.',
        variant: 'destructive',
      });

      setIsAssistantSubmitting(false);
      setIsConfirmationDialogOpen(false);
    }
  };

  return (
    <div className="flex h-full flex-col">
      {validateUninsertedFields && uninsertedFields[0] && (
        <FieldToolTip key={uninsertedFields[0].id} field={uninsertedFields[0]} color="warning">
          <Trans>Click to insert field</Trans>
        </FieldToolTip>
      )}

      <div className="custom-scrollbar -mx-2 flex flex-1 flex-col overflow-y-auto overflow-x-hidden px-2">
        <div className="flex flex-1 flex-col">
          {recipient.role === RecipientRole.VIEWER ? (
            <>
              <div className="-mx-2 flex flex-1 flex-col gap-4 overflow-y-auto px-2">
                <div className="flex flex-1 flex-col gap-y-4" />
                <div className="flex flex-col gap-4 md:flex-row">
                  <Button
                    type="button"
                    className="dark:bg-muted dark:hover:bg-muted/80 w-full bg-black/5 hover:bg-black/10"
                    variant="secondary"
                    size="lg"
                    disabled={typeof window !== 'undefined' && window.history.length <= 1}
                    onClick={async () => navigate(-1)}
                  >
                    <Trans>Cancel</Trans>
                  </Button>

                  <DocumentSigningCompleteDialog
                    isSubmitting={isSubmitting}
                    documentTitle={document.title}
                    fields={fields}
                    fieldsValidated={localFieldsValidated}
                    onSignatureComplete={async (nextSigner, accessAuthOptions) =>
                      completeDocument({ nextSigner, accessAuthOptions })
                    }
                    recipient={recipient}
                    allowDictateNextSigner={document.documentMeta?.allowDictateNextSigner}
                    defaultNextSigner={
                      nextRecipient
                        ? { name: nextRecipient.name, email: nextRecipient.email }
                        : undefined
                    }
                  />
                </div>
              </div>
            </>
          ) : recipient.role === RecipientRole.ASSISTANT ? (
            <>
              <form onSubmit={assistantForm.handleSubmit(onAssistantFormSubmit)}>
                <fieldset className="dark:bg-background border-border rounded-2xl border bg-white p-3">
                  <Controller
                    name="selectedSignerId"
                    control={assistantForm.control}
                    rules={{ required: 'Please select a signer' }}
                    render={({ field }) => (
                      <RadioGroup
                        className="gap-0 space-y-3 shadow-none"
                        value={field.value?.toString()}
                        onValueChange={(value) => {
                          field.onChange(value);
                          setSelectedSignerId?.(Number(value));
                        }}
                      >
                        {allRecipients
                          .filter((r) => r.fields.length > 0)
                          .map((r) => (
                            <div
                              key={`${assistantSignersId}-${r.id}`}
                              className="bg-widget border-border relative flex flex-col gap-4 rounded-lg border p-4"
                            >
                              <div className="flex items-center justify-between">
                                <div className="flex items-center gap-3">
                                  <RadioGroupItem
                                    id={`${assistantSignersId}-${r.id}`}
                                    value={r.id.toString()}
                                    className="after:absolute after:inset-0"
                                  />

                                  <div className="grid grow gap-1">
                                    <Label
                                      className="inline-flex items-start"
                                      htmlFor={`${assistantSignersId}-${r.id}`}
                                    >
                                      {r.name}

                                      {r.id === recipient.id && (
                                        <span className="text-muted-foreground ml-2">
                                          {_(msg`(You)`)}
                                        </span>
                                      )}
                                    </Label>
                                    <p className="text-muted-foreground text-xs">{r.email}</p>
                                  </div>
                                </div>
                                <div className="text-muted-foreground text-xs leading-[inherit]">
                                  {r.fields.length} {r.fields.length === 1 ? 'field' : 'fields'}
                                </div>
                              </div>
                            </div>
                          ))}
                      </RadioGroup>
                    )}
                  />
                </fieldset>

                <div className="mt-6 flex flex-col gap-4 md:flex-row">
                  <Button
                    type="submit"
                    className="w-full"
                    size="lg"
                    loading={isAssistantSubmitting}
                  >
                    <Trans>Continue</Trans>
                  </Button>
                </div>

                <AssistantConfirmationDialog
                  hasUninsertedFields={uninsertedFields.length > 0}
                  isOpen={isConfirmationDialogOpen}
                  onClose={() => !isAssistantSubmitting && setIsConfirmationDialogOpen(false)}
                  onConfirm={handleAssistantConfirmDialogSubmit}
                  isSubmitting={isAssistantSubmitting}
                  allowDictateNextSigner={
                    nextRecipient && document.documentMeta?.allowDictateNextSigner
                  }
                  defaultNextSigner={
                    nextRecipient
                      ? { name: nextRecipient.name, email: nextRecipient.email }
                      : undefined
                  }
                />
              </form>
            </>
          ) : (
            <>
              <fieldset
                disabled={isSubmitting}
                className="-mx-2 flex flex-1 flex-col gap-4 overflow-y-auto px-2"
              >
                <div className="flex flex-1 flex-col gap-y-4">
                  <div>
                    <Label htmlFor="full-name">
                      <Trans>Full Name</Trans>
                    </Label>

                    <Input
                      type="text"
                      id="full-name"
                      className="bg-background mt-2"
                      value={fullName}
                      onChange={(e) => setFullName(e.target.value.trimStart())}
                    />
                  </div>

                  {hasSignatureField && (
                    <div>
                      <Label htmlFor="Signature">
                        <Trans>Signature</Trans>
                      </Label>

                      <SignaturePadDialog
                        className="mt-2"
                        disabled={isSubmitting}
                        value={signature ?? ''}
                        onChange={(v) => setSignature(v ?? '')}
                        typedSignatureEnabled={document.documentMeta?.typedSignatureEnabled}
                        uploadSignatureEnabled={document.documentMeta?.uploadSignatureEnabled}
                        drawSignatureEnabled={document.documentMeta?.drawSignatureEnabled}
                      />
                    </div>
                  )}
                </div>
              </fieldset>

              <div className="mt-6 flex flex-col gap-4 md:flex-row">
                <Button
                  type="button"
                  className="dark:bg-muted dark:hover:bg-muted/80 w-full bg-black/5 hover:bg-black/10"
                  variant="secondary"
                  size="lg"
                  disabled={typeof window !== 'undefined' && window.history.length <= 1}
                  onClick={async () => navigate(-1)}
                >
                  <Trans>Cancel</Trans>
                </Button>

                <DocumentSigningCompleteDialog
                  isSubmitting={isSubmitting || isAssistantSubmitting}
                  documentTitle={document.title}
                  fields={fields}
                  fieldsValidated={localFieldsValidated}
                  disabled={!isRecipientsTurn}
                  onSignatureComplete={async (nextSigner, accessAuthOptions) =>
                    completeDocument({
                      accessAuthOptions,
                      nextSigner,
                    })
                  }
                  recipient={recipient}
                  allowDictateNextSigner={
                    nextRecipient && document.documentMeta?.allowDictateNextSigner
                  }
                  defaultNextSigner={
                    nextRecipient
                      ? { name: nextRecipient.name, email: nextRecipient.email }
                      : undefined
                  }
                />
              </div>
            </>
          )}
        </div>
      </div>
    </div>
  );
};