'use strict';

var path = require('path');

var uaDetect = require('./ua-detect.js');
var packages = require('./packages.js');
var Releases = require('./releases.js');

// handlers caching and transformation, probably should be broken down
var getReleases = require('./transform-releases.js');

var installersDir = path.join(__dirname, '..');

serveInstaller.serveInstaller = serveInstaller;
module.exports = serveInstaller;
async function serveInstaller(baseurl, ua, pkg, tag, ext, formats) {
  // TODO put some of this in a middleware? or common function?

  var ver = tag.replace(/^v/, '');
  var lts;
  var channel;

  switch (ver) {
    case 'latest':
      ver = '';
      channel = 'stable';
      break;
    case 'lts':
      lts = true;
      channel = 'stable';
      ver = '';
      break;
    case 'stable':
      channel = 'stable';
      ver = '';
      break;
    case 'beta':
      channel = 'beta';
      ver = '';
      break;
    case 'dev':
      channel = 'dev';
      ver = '';
      break;
  }

  // TODO maybe move package/version/lts/channel detection into getReleases
  var myOs = uaDetect.os(ua);
  var myArch = uaDetect.arch(ua);
  var myLibc = uaDetect.libc(ua);
  let cfg = await packages.get(pkg);
  let rels = await getReleases({
    pkg: cfg.alias || pkg,
    ver,
    os: myOs,
    arch: myArch,
    libc: myLibc,
    lts,
    channel,
    formats,
    limit: 1,
  });

  var rel = rels.releases[0];
  var pkgdir = path.join(installersDir, pkg);
  var opts = {
    baseurl,
    pkg: cfg.alias || pkg,
    ver,
    tag,
    os: myOs,
    arch: myArch,
    lts,
    channel,
    formats,
    limit: 1,
  };
  rel.oses = rels.oses;
  rel.arches = rels.arches;
  rel.formats = rels.formats;

  if ('bat' === ext) {
    return Releases.renderBatch(pkgdir, rel, opts);
  }
  if ('ps1' === ext) {
    return Releases.renderPowerShell(pkgdir, rel, opts);
  }
  return Releases.renderBash(pkgdir, rel, opts);
}