'use strict';

import express from 'express';

import { getFontsPbf, listFonts } from './utils.js';

export const serve_font = async (options, allowedFonts) => {
  const app = express().disable('x-powered-by');

  const lastModified = new Date().toUTCString();

  const fontPath = options.paths.fonts;

  const existingFonts = {};

  app.get(
    '/fonts/:fontstack/:range([\\d]+-[\\d]+).pbf',
    async (req, res, next) => {
      const fontstack = decodeURI(req.params.fontstack);
      const range = req.params.range;

      try {
        const concatenated = await getFontsPbf(
          options.serveAllFonts ? null : allowedFonts,
          fontPath,
          fontstack,
          range,
          existingFonts,
        );

        res.header('Content-type', 'application/x-protobuf');
        res.header('Last-Modified', lastModified);
        return res.send(concatenated);
      } catch (err) {
        res.status(400).header('Content-Type', 'text/plain').send(err);
      }
    },
  );

  app.get('/fonts.json', (req, res, next) => {
    res.header('Content-type', 'application/json');
    return res.send(
      Object.keys(options.serveAllFonts ? existingFonts : allowedFonts).sort(),
    );
  });

  const fonts = await listFonts(options.paths.fonts);
  Object.assign(existingFonts, fonts);
  return app;
};