import { useCurrentEnvelopeRender } from '@documenso/lib/client-only/providers/envelope-render-provider';
import { PDF_VIEWER_ERROR_MESSAGES } from '@documenso/lib/constants/pdf-viewer-i18n';
import { mapSecondaryIdToDocumentId } from '@documenso/lib/utils/envelope';
import { cn } from '@documenso/ui/lib/utils';
import { Button } from '@documenso/ui/primitives/button';
import { Separator } from '@documenso/ui/primitives/separator';
import { Plural, Trans, useLingui } from '@lingui/react/macro';
import { EnvelopeType, RecipientRole } from '@prisma/client';
import { motion } from 'framer-motion';
import {
  ArrowLeftIcon,
  BanIcon,
  DownloadCloudIcon,
  PanelLeftCloseIcon,
  PanelLeftOpenIcon,
  PaperclipIcon,
} from 'lucide-react';
import { useMemo, useRef, useState } from 'react';
import { Link } from 'react-router';
import { match } from 'ts-pattern';

import { EnvelopeDownloadDialog } from '~/components/dialogs/envelope-download-dialog';
import { SignFieldCheckboxDialog } from '~/components/dialogs/sign-field-checkbox-dialog';
import { SignFieldDropdownDialog } from '~/components/dialogs/sign-field-dropdown-dialog';
import { SignFieldEmailDialog } from '~/components/dialogs/sign-field-email-dialog';
import { SignFieldInitialsDialog } from '~/components/dialogs/sign-field-initials-dialog';
import { SignFieldNameDialog } from '~/components/dialogs/sign-field-name-dialog';
import { SignFieldNumberDialog } from '~/components/dialogs/sign-field-number-dialog';
import { SignFieldSignatureDialog } from '~/components/dialogs/sign-field-signature-dialog';
import { SignFieldTextDialog } from '~/components/dialogs/sign-field-text-dialog';
import { useEmbedSigningContext } from '~/components/embed/embed-signing-context';
import { EnvelopeSignerPageRenderer } from '~/components/general/envelope-signing/envelope-signer-page-renderer';
import { EnvelopePdfViewer } from '~/components/general/pdf-viewer/envelope-pdf-viewer';

import { BrandingLogo } from '../branding-logo';
import { DocumentSigningAttachmentsPopover } from '../document-signing/document-signing-attachments-popover';
import { EnvelopeItemSelector } from '../envelope-editor/envelope-file-selector';
import EnvelopeSignerForm from '../envelope-signing/envelope-signer-form';
import { EnvelopeSignerHeader } from '../envelope-signing/envelope-signer-header';
import { DocumentSigningMobileWidget } from './document-signing-mobile-widget';
import { DocumentSigningRejectDialog } from './document-signing-reject-dialog';
import { useRequiredEnvelopeSigningContext } from './envelope-signing-provider';

export const DocumentSigningPageViewV2 = () => {
  const { envelopeItems, currentEnvelopeItem, setCurrentEnvelopeItem } = useCurrentEnvelopeRender();

  const scrollableContainerRef = useRef<HTMLDivElement>(null);

  const {
    isDirectTemplate,
    envelope,
    recipient,
    recipientFields,
    recipientFieldsRemaining,
    requiredRecipientFields,
    selectedAssistantRecipientFields,
  } = useRequiredEnvelopeSigningContext();

  const {
    isEmbed = false,
    allowDocumentRejection = true,
    hidePoweredBy = true,
    onDocumentRejected,
  } = useEmbedSigningContext() || {};

  const { t } = useLingui();
  const [isSidebarCollapsed, setIsSidebarCollapsed] = useState(false);

  /**
   * The total remaining fields remaining for the current recipient or selected assistant recipient.
   *
   * Includes both optional and required fields.
   */
  const remainingFields = useMemo(() => {
    if (recipient.role === RecipientRole.ASSISTANT) {
      return selectedAssistantRecipientFields.filter((field) => !field.inserted);
    }

    return recipientFields.filter((field) => !field.inserted);
  }, [recipientFieldsRemaining, selectedAssistantRecipientFields, currentEnvelopeItem]);

  return (
    <div className="min-h-screen w-screen bg-gray-50 dark:bg-background">
      <SignFieldEmailDialog.Root />
      <SignFieldTextDialog.Root />
      <SignFieldNumberDialog.Root />
      <SignFieldNameDialog.Root />
      <SignFieldInitialsDialog.Root />
      <SignFieldDropdownDialog.Root />
      <SignFieldSignatureDialog.Root />
      <SignFieldCheckboxDialog.Root />

      <EnvelopeSignerHeader />

      {/* Main Content Area */}
      <div className="flex h-[calc(100vh-4rem)] w-screen">
        {/* Left Section - Step Navigation */}
        <div
          className={cn(
            'embed--DocumentWidgetContainer hidden flex-shrink-0 flex-col border-border border-r bg-background transition-[width] duration-300 lg:flex',
            isSidebarCollapsed ? 'w-12' : 'w-80',
          )}
        >
          {isSidebarCollapsed && (
            <div className="flex justify-center pt-4">
              <Button
                variant="ghost"
                className="h-7 w-7 p-0"
                aria-label={t`Expand sidebar`}
                onClick={() => setIsSidebarCollapsed(false)}
              >
                <PanelLeftOpenIcon className="h-4 w-4" />
              </Button>
            </div>
          )}

          <div className={cn('flex flex-1 flex-col overflow-hidden py-4', isSidebarCollapsed && 'invisible w-0')}>
            <div className="px-4">
              <h3 className="flex items-end justify-between font-semibold text-foreground text-sm">
                {match(recipient.role)
                  .with(RecipientRole.VIEWER, () => <Trans>View Document</Trans>)
                  .with(RecipientRole.SIGNER, () => <Trans>Sign Document</Trans>)
                  .with(RecipientRole.APPROVER, () => <Trans>Approve Document</Trans>)
                  .with(RecipientRole.ASSISTANT, () => <Trans>Assist Document</Trans>)
                  .otherwise(() => null)}

                <div className="ml-2 flex items-center gap-1">
                  <span className="rounded border bg-muted/50 px-2 py-0.5 text-muted-foreground text-xs">
                    <Plural
                      value={recipientFieldsRemaining.length}
                      one="1 Field Remaining"
                      other="# Fields Remaining"
                    />
                  </span>

                  <Button
                    variant="ghost"
                    className="h-7 w-7 p-0"
                    aria-label={t`Collapse sidebar`}
                    onClick={() => setIsSidebarCollapsed(true)}
                  >
                    <PanelLeftCloseIcon className="h-4 w-4" />
                  </Button>
                </div>
              </h3>

              <div className="relative my-4 h-[4px] rounded-md bg-muted">
                <motion.div
                  layout="size"
                  layoutId="document-flow-container-step"
                  className="absolute inset-y-0 left-0 bg-primary"
                  style={{
                    width: `${requiredRecipientFields.length === 0 ? 100 : 100 - (100 / requiredRecipientFields.length) * (recipientFieldsRemaining.length ?? 0)}%`,
                  }}
                />
              </div>

              <div className="embed--DocumentWidgetContent mt-6 space-y-3">
                <EnvelopeSignerForm />
              </div>
            </div>

            <Separator className="my-6" />

            {/* Quick Actions. */}
            {!isDirectTemplate && (
              <div className="embed--Actions space-y-3 px-4">
                <h4 className="font-semibold text-foreground text-sm">
                  <Trans>Actions</Trans>
                </h4>

                <DocumentSigningAttachmentsPopover
                  envelopeId={envelope.id}
                  token={recipient.token}
                  trigger={
                    <Button variant="ghost" size="sm" className="w-full justify-start">
                      <PaperclipIcon className="mr-2 h-4 w-4" />
                      <Trans>Attachments</Trans>
                    </Button>
                  }
                />

                <EnvelopeDownloadDialog
                  envelopeId={envelope.id}
                  envelopeStatus={envelope.status}
                  envelopeItems={envelope.envelopeItems}
                  token={recipient.token}
                  trigger={
                    <Button variant="ghost" size="sm" className="w-full justify-start">
                      <DownloadCloudIcon className="mr-2 h-4 w-4" />
                      <Trans>Download PDF</Trans>
                    </Button>
                  }
                />

                {envelope.type === EnvelopeType.DOCUMENT && allowDocumentRejection && (
                  <DocumentSigningRejectDialog
                    documentId={mapSecondaryIdToDocumentId(envelope.secondaryId)}
                    token={recipient.token}
                    onRejected={
                      onDocumentRejected &&
                      ((reason) =>
                        onDocumentRejected({
                          token: recipient.token,
                          documentId: mapSecondaryIdToDocumentId(envelope.secondaryId),
                          envelopeId: envelope.id,
                          recipientId: recipient.id,
                          reason,
                        }))
                    }
                    trigger={
                      <Button variant="ghost" size="sm" className="w-full justify-start hover:text-destructive">
                        <BanIcon className="mr-2 h-4 w-4" />
                        <Trans>Reject Document</Trans>
                      </Button>
                    }
                  />
                )}
              </div>
            )}

            <div className="embed--DocumentWidgetFooter mt-auto">
              {/* Footer of left sidebar. */}
              {!isEmbed && (
                <div className="px-4">
                  <Button asChild variant="ghost" className="w-full justify-start">
                    <Link to="/">
                      <ArrowLeftIcon className="mr-2 h-4 w-4" />
                      <Trans>Return</Trans>
                    </Link>
                  </Button>
                </div>
              )}
            </div>
          </div>
        </div>

        <div className="embed--DocumentContainer min-w-0 flex-1 overflow-y-auto" ref={scrollableContainerRef}>
          <div className="flex flex-col">
            {/* Horizontal envelope item selector */}
            {envelopeItems.length > 1 && (
              <div className="flex h-fit space-x-2 overflow-x-auto p-2 pt-4 sm:p-4">
                {envelopeItems.map((doc, i) => (
                  <EnvelopeItemSelector
                    key={doc.id}
                    number={i + 1}
                    primaryText={doc.title}
                    secondaryText={
                      <Plural
                        one="1 Field"
                        other="# Fields"
                        value={remainingFields.filter((field) => field.envelopeItemId === doc.id).length}
                      />
                    }
                    isSelected={currentEnvelopeItem?.id === doc.id}
                    buttonProps={{ onClick: () => setCurrentEnvelopeItem(doc.id) }}
                  />
                ))}
              </div>
            )}

            {/* Document View */}
            <div className="embed--DocumentViewer flex flex-col items-center justify-center p-2 sm:mt-4 sm:p-4">
              {currentEnvelopeItem ? (
                <EnvelopePdfViewer
                  key={currentEnvelopeItem.id}
                  customPageRenderer={EnvelopeSignerPageRenderer}
                  scrollParentRef={scrollableContainerRef}
                  errorMessage={PDF_VIEWER_ERROR_MESSAGES.signing}
                />
              ) : (
                <div className="flex flex-col items-center justify-center py-32">
                  <p className="text-foreground text-sm">
                    <Trans>No document selected</Trans>
                  </p>
                </div>
              )}

              {/* Mobile widget - Additional padding to allow users to scroll */}
              <div className="block pb-28 lg:hidden">
                <DocumentSigningMobileWidget />
              </div>

              {!hidePoweredBy && (
                <a
                  href="https://documenso.com"
                  target="_blank"
                  className="fixed right-0 bottom-0 z-40 hidden cursor-pointer rounded-tl bg-primary px-2 py-1 font-medium text-primary-foreground text-xs opacity-60 hover:opacity-100 lg:block"
                  rel="noopener"
                >
                  <span>
                    <Trans>Powered by</Trans>
                  </span>
                  <BrandingLogo className="ml-2 inline-block h-[14px]" />
                </a>
              )}
            </div>
          </div>
        </div>
      </div>
    </div>
  );
};