'use strict';

const path = require('path');
const fs = require('fs');
const url = require('url');

const appDirectory = fs.realpathSync(process.cwd());
const resolveApp = relativePath => path.resolve(appDirectory, relativePath);

const envPublicUrl = process.env.PUBLIC_URL;

function ensureSlash(path, needsSlash) {
  const hasSlash = path.endsWith('/');
  if (hasSlash && !needsSlash) {
    return path.substr(path, path.length - 1);
  } else if (!hasSlash && needsSlash) {
    return `${path}/`;
  } else {
    return path;
  }
}

const getPublicUrl = appPackageJson =>
  envPublicUrl || require(appPackageJson).homepage;

function getServedPath(appPackageJson) {
  const publicUrl = getPublicUrl(appPackageJson);
  const servedUrl =
    envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : '/');
  return ensureSlash(servedUrl, true);
}

module.exports = {
  appPackageJson: resolveApp('package.json'),
  appTsConfig: resolveApp('tsconfig.json'),
  appTsLint: resolveApp('tslint.json'),

  yarnLockFile: resolveApp('yarn.lock'),
  testsSetup: resolveApp('src/setupTests.js'),
  appNodeModules: resolveApp('node_modules'),
  publicUrl: getPublicUrl(resolveApp('package.json')),
  servedPath: getServedPath(resolveApp('package.json')),

  dotenv: resolveApp('.env'),
  serverAssets: resolveApp('assets'),
  appSrc: resolveApp('src'),
  appLib: resolveApp('lib'),
  appEntry: resolveApp('src/index.ts'),
  appBuild: resolveApp('../build/server'),
  temporalOutput: resolveApp('tmp'),
};