import page, { RequestHandlerParams } from '/lib/page.ts';

import { AppConfig } from '/lib/config.ts';

async function get({ request, user, match }: RequestHandlerParams) {
  const calendarConfig = await AppConfig.getCalendarConfig();

  if (!calendarConfig.enableCalDavServer) {
    return new Response('Not Found', { status: 404 });
  }

  if (!user) {
    return new Response('Unauthorized', {
      status: 401,
      headers: { 'www-authenticate': 'Basic realm="bewCloud", charset="UTF-8"' },
    });
  }

  let { path } = match.pathname.groups;

  if (!path) {
    path = '/';
  }

  const userId = user.id;

  try {
    const requestBodyText = await request.clone().text();

    // Remove the `/caldav/` prefix from the hrefs in the request
    let parsedRequestBodyText: string | undefined = requestBodyText.replaceAll('<href>/caldav/', `<href>/`).replaceAll(
      ':href>/caldav/',
      `:href>/`,
    );

    // The spec doesn't allow a body for GET or HEAD requests (and Deno fails if you try)
    if (request.method === 'GET' || request.method === 'HEAD') {
      parsedRequestBodyText = undefined;
    }

    const response = await fetch(`${calendarConfig.calDavUrl}/${path}`, {
      headers: {
        ...Object.fromEntries(request.headers.entries()),
        'X-Remote-User': `${userId}`,
      },
      method: request.method,
      body: parsedRequestBodyText,
    });

    if (response.status === 204) {
      return new Response(null, { status: 204 });
    }

    const responseBodyText = await response.clone().text();

    // Add the `/caldav/` prefix to the hrefs in the response
    const parsedBodyResponseText = responseBodyText.replaceAll('<href>/', `<href>/caldav/`).replaceAll(
      ':href>/',
      `:href>/caldav/`,
    );

    return new Response(parsedBodyResponseText, {
      status: response.status,
      headers: response.headers,
    });
  } catch (error) {
    console.error(error);
  }

  return new Response(null, { status: 405 });
}

export default page({
  get,
  put: get,
  delete: get,
  options: get,
  catchAll: get,
  accessMode: 'public',
});