import type { DmsPreviewResourceType } from '#/api/x/dms/preview';

import { createDmsFilePreviewTicket } from '#/api/x/dms/preview';
import { onlineUtils } from '#/utils/jnpf';

const SUPPORTED_EXTENSIONS = new Set([
  'csv',
  'doc',
  'docm',
  'docx',
  'dot',
  'dotx',
  'htm',
  'html',
  'odp',
  'ods',
  'odt',
  'otp',
  'ots',
  'ott',
  'pdf',
  'pot',
  'potx',
  'pps',
  'ppsx',
  'ppt',
  'pptm',
  'pptx',
  'rtf',
  'txt',
  'xls',
  'xlsm',
  'xlsx',
  'xlt',
  'xltx',
]);
const openingResources = new Set<string>();

export interface OpenDmsFilePreviewOptions {
  fileName: string;
  resourceId: string;
  resourceType: DmsPreviewResourceType;
}

export function supportsOnlyOfficePreview(fileName: string) {
  const normalized = fileName.trim().toLowerCase();
  const extension = normalized.includes('.') ? normalized.split('.').pop() || '' : '';
  return SUPPORTED_EXTENSIONS.has(extension);
}

export async function openDmsFilePreview(options: OpenDmsFilePreviewOptions) {
  if (!supportsOnlyOfficePreview(options.fileName)) {
    throw new Error('OnlyOffice 不支持该文件格式');
  }
  const openingKey = `${options.resourceType}:${options.resourceId}`;
  if (openingResources.has(openingKey)) return false;
  openingResources.add(openingKey);
  try {
    const response = await createDmsFilePreviewTicket({
      operationId: crypto.randomUUID(),
      resourceId: options.resourceId,
      resourceType: options.resourceType,
    });
    const ticket = response.data;
    if (!ticket?.accessTicket || !ticket.fileVersionId || !ticket.fileName) {
      throw new Error('后端返回的 DMS 预览票据不完整');
    }
    if (!supportsOnlyOfficePreview(ticket.fileName)) {
      throw new Error('OnlyOffice 不支持该文件格式');
    }
    onlineUtils.openOfficeDocument({
      dmsAccessTicket: ticket.accessTicket,
      file: {
        fileId: ticket.fileVersionId,
        fileSize: ticket.sizeBytes,
        name: ticket.fileName,
      },
      fileType: 'dms',
      mode: 'view',
      title: ticket.fileName,
    });
    return true;
  } finally {
    openingResources.delete(openingKey);
  }
}

export function dmsPreviewErrorMessage(error: unknown) {
  return error instanceof Error && error.message ? error.message : '文件预览失败';
}