const { resolvePlayerRegistration } = require('#src/data/player-registry');

const TASK = {
  taskType: 'slide-thumbnail-refresh'
};

async function fetchPlayerInternalBaseUrl(pool, configuredPlayerInternalBaseUrl) {
  const configured = String(configuredPlayerInternalBaseUrl || '').trim().replace(/\/$/, '');
  if (configured) {
    return configured;
  }

  const { getConfiguredPlayerIdentifier } = require('#src/data/player-registry');
  const player = await resolvePlayerRegistration(pool, getConfiguredPlayerIdentifier());
  return String(player && player.internal_base_url || '').trim().replace(/\/$/, '') || null;
}

function registerSlideThumbnailRefreshTask(options) {
  const backgroundTaskQueue = options && options.backgroundTaskQueue;
  const captureSlideThumbnail = options && options.captureSlideThumbnail;
  const pool = options && options.pool;
  const common = options && options.common;
  const mediaDir = String(options && options.mediaDir || '').trim();
  const configuredWebBaseUrl = String(options && options.webBaseUrl || '').trim().replace(/\/$/, '');

  if (!backgroundTaskQueue || typeof captureSlideThumbnail !== 'function' || !pool || !common || !mediaDir) {
    throw new Error('registerSlideThumbnailRefreshTask requires the slide thumbnail dependencies.');
  }

  // Refresh the slide thumbnail for one slide id.
  backgroundTaskQueue.setTaskHandler(TASK.taskType, async function (task) {
    const payload = task && task.payload ? task.payload : {};
    const slideId = Number(payload.slideId || 0);
    if (!Number.isFinite(slideId) || slideId <= 0) {
      throw new Error('Slide id is required.');
    }

    const webBaseUrl = configuredWebBaseUrl || `http://127.0.0.1:${Number(process.env.WEB_PORT || 8080)}`;
    if (!webBaseUrl) {
      throw new Error('Web base URL is required.');
    }

    return captureSlideThumbnail({
      pool: pool,
      common: common,
      mediaDir: mediaDir,
      baseUrl: webBaseUrl,
      slideId: slideId,
      previousThumbnailPath: payload.previousThumbnailPath || null,
      fontStylesheetHref: payload.fontStylesheetHref || ''
    });
  });
}

module.exports = { registerSlideThumbnailRefreshTask };