#!/usr/bin/env ruby
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# this work for additional information regarding copyright
# ownership. Elasticsearch 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

#
# generate property file for the jdk randomization test
# 
#
require 'yaml'

class JDKSelector
  attr_reader :directory, :jdk_list

  def initialize(directory)
    @directory = directory
  end

  # get selection of available jdks from jenkins automatic install directory
  def get_jdk
    @jdk_list = Dir.entries(directory).select do |x| 
      x.chars.first == 'J' 
    end.map do |y|
      File.join(directory, y)
    end
    self
  end

  # do ranomize selection from a given array
  def select_one(selection_array = nil)
    selection_array = filter_java_6(selection_array || @jdk_list)
    selection_array[rand(selection_array.size)]

    get_random_one(selection_array)
  end
end

def get_random_one(data_array)
  data_array[rand(data_array.size)]
end

def filter_java_6(files)
  files.select{ |i| File.basename(i).split(/[^0-9]/)[-1].to_i > 6 }
end

# given a jdk directory selection, generate relevant environment variables
def get_env_matrix(data_array)
  
  #refactoring target
  es_test_jvm_option1 = get_random_one(['-server']) #only server for now get_random_one(['-client', '-server'])
  es_test_jvm_option2 = get_random_one(['-XX:+UseConcMarkSweepGC', '-XX:+UseParallelGC', '-XX:+UseSerialGC', '-XX:+UseG1GC'])

  es_test_jvm_option3 = get_random_one(['-XX:+UseCompressedOops', '-XX:-UseCompressedOops'])
  es_node_mode =  get_random_one(['local', 'network'])
  tests_nightly = get_random_one([true, false])
  tests_nightly = get_random_one([false]) #bug

  test_assert_off = (rand(10) == 9) #10 percent chance turning it off 
  tests_security_manager = (rand(10) != 9) #10 percent chance running without security manager
  arg_line = [es_test_jvm_option1, es_test_jvm_option2, es_test_jvm_option3]
  [*data_array].map do |x|
    data_hash = {
      'PATH' => File.join(x,'bin') + ':' + ENV['PATH'],
      'JAVA_HOME' => x,
      'BUILD_DESC' => "%s,%s,%s%s,%s %s%s%s"%[File.basename(x), es_node_mode, tests_nightly ? 'nightly,':'',
                                            es_test_jvm_option1[1..-1], es_test_jvm_option2[4..-1], es_test_jvm_option3[4..-1],
                                            test_assert_off ? ',assert off' : '', tests_security_manager ? ', security manager enabled' : ''], 
      'es.node.mode' => es_node_mode,
      'tests.nightly' => tests_nightly,
      'tests.security.manager' => tests_security_manager,
      'tests.jvm.argline' => arg_line.join(" "),
    }
    data_hash['tests.assertion.disabled'] = 'org.elasticsearch' if test_assert_off
    data_hash
  end
end

# pick first element out of array of hashes, generate write java property file
def generate_property_file(directory, data)
  #array transformation
  content = data.first.map do |key, value|
    "%s=%s"%[key, value]
  end
  file_name = (ENV['BUILD_ID'] + ENV['BUILD_NUMBER']) || 'prop' rescue 'prop'
  file_name = file_name.split(File::SEPARATOR).first + '.txt'
  File.open(File.join(directory, file_name), 'w') do |file| 
              file.write(content.join("\n")) 
  end
end

working_directory = ENV['WORKSPACE'] || '/var/tmp'
unless(ENV['BUILD_ID'])
  #local mode set up fake environment 
  test_directory = 'tools/hudson.model.JDK/'
  unless(File.exist?(test_directory))
    puts "running local mode, setting up running environment"
    puts "properties are written to file prop.txt"
    system("mkdir -p %sJDK{6,7}"%test_directory)
  end
  working_directory = ENV['PWD']
end
# jenkins sets pwd prior to execution
jdk_selector = JDKSelector.new(File.join(ENV['PWD'],'tools','hudson.model.JDK'))
environment_matrix = get_env_matrix(jdk_selector.get_jdk.select_one)

generate_property_file(working_directory, environment_matrix)