const url = require('url');
const tunnel = require('tunnel-agent');
const util = require('./util');

function applyProxy(reqOpts, opts) {
  const log = opts.log || util.noopLogger;

  const proxy = opts['https-proxy'] || opts.proxy;

  if (proxy) {
    // eslint-disable-next-line node/no-deprecated-api
    const parsedDownloadUrl = url.parse(reqOpts.url);
    // eslint-disable-next-line node/no-deprecated-api
    const parsedProxy = url.parse(proxy);
    const uriProtocol =
      parsedDownloadUrl.protocol === 'https:' ? 'https' : 'http';
    const proxyProtocol = parsedProxy.protocol === 'https:' ? 'Https' : 'Http';
    const tunnelFnName = [uriProtocol, proxyProtocol].join('Over');
    reqOpts.agent = tunnel[tunnelFnName]({
      proxy: {
        host: parsedProxy.hostname,
        port: +parsedProxy.port,
        proxyAuth: parsedProxy.auth,
      },
    });
    log.http(
      'request',
      'Proxy setup detected (Host: ' +
        parsedProxy.hostname +
        ', Port: ' +
        parsedProxy.port +
        ', Authentication: ' +
        (parsedProxy.auth ? 'Yes' : 'No') +
        ')' +
        ' Tunneling with ' +
        tunnelFnName
    );
  }

  return reqOpts;
}

module.exports = applyProxy;