"use strict"

var path = require("path")
var fs = require("fs")
var url = require("url")

// Make sure any symlinks in the project folder are resolved:
// https://github.com/facebookincubator/create-react-app/issues/637
var appDirectory = fs.realpathSync(process.cwd())
function resolveApp(relativePath) {
  return path.resolve(appDirectory, relativePath)
}

// We support resolving modules according to `NODE_PATH`.
// This lets you use absolute paths in imports inside large monorepos:
// https://github.com/facebookincubator/create-react-app/issues/253.

// It works similar to `NODE_PATH` in Node itself:
// https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders

// We will export `nodePaths` as an array of absolute paths.
// It will then be used by Webpack configs.
// Jest doesn’t need this because it already handles `NODE_PATH` out of the box.

// Note that unlike in Node, only *relative* paths from `NODE_PATH` are honored.
// Otherwise, we risk importing Node.js core modules into an app instead of Webpack shims.
// https://github.com/facebookincubator/create-react-app/issues/1023#issuecomment-265344421

var nodePaths = (process.env.NODE_PATH || "")
  .split(process.platform === "win32" ? ";" : ":")
  .filter(Boolean)
  .filter(folder => !path.isAbsolute(folder))
  .map(resolveApp)

var envPublicUrl = process.env.PUBLIC_URL

function ensureSlash(path, needsSlash) {
  var hasSlash = path.endsWith("/")
  if (hasSlash && !needsSlash) {
    return path.substr(path, path.length - 1)
  } else if (!hasSlash && needsSlash) {
    return path + "/"
  } else {
    return path
  }
}

function getPublicUrl(appPackageJson) {
  return envPublicUrl || require(appPackageJson).homepage
}

// We use `PUBLIC_URL` environment variable or "homepage" field to infer
// "public path" at which the app is served.
// Webpack needs to know it to put the right <script> hrefs into HTML even in
// single-page apps that may serve index.html for nested URLs like /todos/42.
// We can't use a relative path in HTML because we don't want to load something
// like /todos/42/static/js/bundle.7289d.js. We have to know the root.
function getServedPath(appPackageJson) {
  var publicUrl = getPublicUrl(appPackageJson)
  var servedUrl = envPublicUrl || (publicUrl ? url.parse(publicUrl).pathname : "/")
  return ensureSlash(servedUrl, true)
}

// config after eject: we're in ./config/
module.exports = {
  appBuild: resolveApp("build"),
  appPublic: resolveApp("public"),
  appHtml: resolveApp("public/index.html"),
  appIndexJs: resolveApp("client/index.js"),
  appPackageJson: resolveApp("package.json"),
  appSrc: resolveApp("client"),
  yarnLockFile: resolveApp("yarn.lock"),
  testsSetup: resolveApp("client/setupTests.js"),
  appNodeModules: resolveApp("node_modules"),
  nodePaths: nodePaths,
  publicUrl: getPublicUrl(resolveApp("package.json")),
  servedPath: getServedPath(resolveApp("package.json"))
}