// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

'use strict'

const path = require('path')
const cp = require('child_process')

/**
 * returns path to java or 'java' string if JAVA_HOME does not exist in env obj
 * @returns {string}
 */
function getJavaPath() {
  return process.env['JAVA_HOME']
    ? path.join(process.env['JAVA_HOME'], 'bin/java')
    : 'java'
}

/**
 * @param {string} seleniumStandalonePath path to standalone server
 * @returns {boolean}
 */
function isSelenium3x(seleniumStandalonePath) {
  const javaPath = getJavaPath()

  const execRes = cp.execSync(
    `${javaPath} -jar ${seleniumStandalonePath} --version`
  )

  return execRes.toString().trim().startsWith('Selenium server version: 3')
}

/**
 * @param {string} seleniumStandalonePath path to standalone server
 * @param {Array.<string>} args spawn arguments array
 * returns formatted args based on selenium standalone server version
 * @returns {Array.<string>}
 */
function formatSpawnArgs(seleniumStandalonePath, args) {
  if (isSelenium3x(seleniumStandalonePath)) {
    console.warn('Deprecation: Support for Standalone Server 3.x will be removed soon. Please update to version 4.x')
    return args
  }

  const standaloneArg = 'standalone'
  const port3xArgFormat = '-port'
  const port4xArgFormat = '--port'

  let formattedArgs = Array.from(args)

  const standaloneArgIndex = formattedArgs.findIndex(
    (arg) => arg === seleniumStandalonePath
  )
  const v3portArgFormat = formattedArgs.findIndex(
    (arg) => arg === port3xArgFormat
  )

  // old v3x port arg format was -port, new v4x port arg format is --port
  if (v3portArgFormat !== -1) {
    formattedArgs[v3portArgFormat] = port4xArgFormat
  }

  // 'standalone' arg should be right after jar file path
  // in case if it is already in place - returns args
  if (formattedArgs[standaloneArgIndex + 1] === standaloneArg)
    return formattedArgs

  // insert 'standalone' right after jar file path
  formattedArgs.splice(standaloneArgIndex + 1, 0, standaloneArg)

  return formattedArgs
}

// PUBLIC API
module.exports = {
  getJavaPath,
  isSelenium3x,
  formatSpawnArgs,
}