import { type ReactNode, useState } from 'react';

import { msg } from '@lingui/core/macro';
import { useLingui } from '@lingui/react';
import { Trans } from '@lingui/react/macro';
import { Loader } from 'lucide-react';
import { ErrorCode, type FileRejection, useDropzone } from 'react-dropzone';
import { Link, useNavigate, useParams } from 'react-router';
import { match } from 'ts-pattern';

import { useLimits } from '@documenso/ee/server-only/limits/provider/client';
import { useAnalytics } from '@documenso/lib/client-only/hooks/use-analytics';
import { useCurrentOrganisation } from '@documenso/lib/client-only/providers/organisation';
import { useSession } from '@documenso/lib/client-only/providers/session';
import { APP_DOCUMENT_UPLOAD_SIZE_LIMIT, IS_BILLING_ENABLED } from '@documenso/lib/constants/app';
import { DEFAULT_DOCUMENT_TIME_ZONE, TIME_ZONES } from '@documenso/lib/constants/time-zones';
import { AppError, AppErrorCode } from '@documenso/lib/errors/app-error';
import { megabytesToBytes } from '@documenso/lib/universal/unit-convertions';
import { formatDocumentsPath } from '@documenso/lib/utils/teams';
import { trpc } from '@documenso/trpc/react';
import type { TCreateDocumentPayloadSchema } from '@documenso/trpc/server/document-router/create-document.types';
import { cn } from '@documenso/ui/lib/utils';
import { useToast } from '@documenso/ui/primitives/use-toast';

import { useCurrentTeam } from '~/providers/team';

export interface DocumentDropZoneWrapperProps {
  children: ReactNode;
  className?: string;
}

export const DocumentDropZoneWrapper = ({ children, className }: DocumentDropZoneWrapperProps) => {
  const { _ } = useLingui();
  const { toast } = useToast();
  const { user } = useSession();
  const { folderId } = useParams();

  const team = useCurrentTeam();

  const navigate = useNavigate();
  const analytics = useAnalytics();
  const organisation = useCurrentOrganisation();

  const [isLoading, setIsLoading] = useState(false);

  const userTimezone =
    TIME_ZONES.find((timezone) => timezone === Intl.DateTimeFormat().resolvedOptions().timeZone) ??
    DEFAULT_DOCUMENT_TIME_ZONE;

  const { quota, remaining, refreshLimits } = useLimits();

  const { mutateAsync: createDocument } = trpc.document.create.useMutation();

  const isUploadDisabled = remaining.documents === 0 || !user.emailVerified;

  const onFileDrop = async (file: File) => {
    if (isUploadDisabled && IS_BILLING_ENABLED()) {
      await navigate(`/o/${organisation.url}/settings/billing`);
      return;
    }

    try {
      setIsLoading(true);

      const payload = {
        title: file.name,
        timezone: userTimezone,
        folderId: folderId ?? undefined,
      } satisfies TCreateDocumentPayloadSchema;

      const formData = new FormData();

      formData.append('payload', JSON.stringify(payload));
      formData.append('file', file);

      const { envelopeId: id } = await createDocument(formData);

      void refreshLimits();

      toast({
        title: _(msg`Document uploaded`),
        description: _(msg`Your document has been uploaded successfully.`),
        duration: 5000,
      });

      analytics.capture('App: Document Uploaded', {
        userId: user.id,
        documentId: id,
        timestamp: new Date().toISOString(),
      });

      await navigate(`${formatDocumentsPath(team.url)}/${id}/edit`);
    } catch (err) {
      const error = AppError.parseError(err);

      const errorMessage = match(error.code)
        .with('INVALID_DOCUMENT_FILE', () => msg`You cannot upload encrypted PDFs`)
        .with(
          AppErrorCode.LIMIT_EXCEEDED,
          () => msg`You have reached your document limit for this month. Please upgrade your plan.`,
        )
        .with(
          'ENVELOPE_ITEM_LIMIT_EXCEEDED',
          () => msg`You have reached the limit of the number of files per envelope`,
        )
        .otherwise(() => msg`An error occurred while uploading your document.`);

      toast({
        title: _(msg`Error`),
        description: _(errorMessage),
        variant: 'destructive',
        duration: 7500,
      });
    } finally {
      setIsLoading(false);
    }
  };

  const onFileDropRejected = (fileRejections: FileRejection[]) => {
    if (!fileRejections.length) {
      return;
    }

    // Since users can only upload only one file (no multi-upload), we only handle the first file rejection
    const { file, errors } = fileRejections[0];

    if (!errors.length) {
      return;
    }

    const errorNodes = errors.map((error, index) => (
      <span key={index} className="block">
        {match(error.code)
          .with(ErrorCode.FileTooLarge, () => (
            <Trans>File is larger than {APP_DOCUMENT_UPLOAD_SIZE_LIMIT}MB</Trans>
          ))
          .with(ErrorCode.FileInvalidType, () => <Trans>Only PDF files are allowed</Trans>)
          .with(ErrorCode.FileTooSmall, () => <Trans>File is too small</Trans>)
          .with(ErrorCode.TooManyFiles, () => (
            <Trans>Only one file can be uploaded at a time</Trans>
          ))
          .otherwise(() => (
            <Trans>Unknown error</Trans>
          ))}
      </span>
    ));

    const description = (
      <>
        <span className="font-medium">
          {file.name} <Trans>couldn't be uploaded:</Trans>
        </span>
        {errorNodes}
      </>
    );

    toast({
      title: _(msg`Upload failed`),
      description,
      duration: 5000,
      variant: 'destructive',
    });
  };
  const { getRootProps, getInputProps, isDragActive } = useDropzone({
    accept: {
      'application/pdf': ['.pdf'],
    },
    //disabled: isUploadDisabled,
    multiple: false,
    maxSize: megabytesToBytes(APP_DOCUMENT_UPLOAD_SIZE_LIMIT),
    onDrop: ([acceptedFile]) => {
      if (acceptedFile) {
        void onFileDrop(acceptedFile);
      }
    },
    onDropRejected: (fileRejections) => {
      onFileDropRejected(fileRejections);
    },
    noClick: true,
    noDragEventsBubbling: true,
  });

  return (
    <div {...getRootProps()} className={cn('relative min-h-screen', className)}>
      <input {...getInputProps()} />
      {children}

      {isDragActive && (
        <div className="bg-muted/60 fixed left-0 top-0 z-[9999] h-full w-full backdrop-blur-[4px]">
          <div className="pointer-events-none flex h-full w-full flex-col items-center justify-center">
            <h2 className="text-foreground text-2xl font-semibold">
              <Trans>Upload Document</Trans>
            </h2>

            <p className="text-muted-foreground text-md mt-4">
              <Trans>Drag and drop your PDF file here</Trans>
            </p>

            {isUploadDisabled && IS_BILLING_ENABLED() && (
              <Link
                to={`/o/${organisation.url}/settings/billing`}
                className="mt-4 text-sm text-amber-500 hover:underline dark:text-amber-400"
              >
                <Trans>Upgrade your plan to upload more documents</Trans>
              </Link>
            )}

            {!isUploadDisabled &&
              team?.id === undefined &&
              remaining.documents > 0 &&
              Number.isFinite(remaining.documents) && (
                <p className="text-muted-foreground/80 mt-4 text-sm">
                  <Trans>
                    {remaining.documents} of {quota.documents} documents remaining this month.
                  </Trans>
                </p>
              )}
          </div>
        </div>
      )}

      {isLoading && (
        <div className="bg-muted/30 absolute inset-0 z-50 backdrop-blur-[2px]">
          <div className="pointer-events-none flex h-1/2 w-full flex-col items-center justify-center">
            <Loader className="text-primary h-12 w-12 animate-spin" />
            <p className="text-foreground mt-8 font-medium">
              <Trans>Uploading document...</Trans>
            </p>
          </div>
        </div>
      )}
    </div>
  );
};