const express = require("express");
const { sendImmutableMedia } = require("./streaming");

function createMediaRouter(assetService) {
  const router = express.Router();

  async function sendMedia(request, response, next, kind) {
    const version = request.params.version;
    if (!version.endsWith(".webp")) {
      response.status(404).json({
        error: {
          code: "MEDIA_NOT_FOUND",
          message: "Asset media version not found",
        },
      });
      return;
    }

    try {
      const descriptor = assetService.mediaDescriptor(
        request.params.assetId,
        kind,
        version.slice(0, -".webp".length),
      );
      await sendImmutableMedia(assetService, response, descriptor);
    } catch (error) {
      if (response.headersSent) {
        response.destroy(error);
        return;
      }
      next(error);
    }
  }

  router.get("/assets/:assetId/display/:version", (request, response, next) =>
    sendMedia(request, response, next, "display"),
  );
  router.get(
    "/assets/:assetId/thumbnail/:version",
    (request, response, next) =>
      sendMedia(request, response, next, "thumbnail"),
  );

  return router;
}

module.exports = {
  createMediaRouter,
};