#!/usr/bin/env ruby
require 'rubygems'
require 'optparse'
require 'parallel'
raise "please ' gem install parallel '" if Gem::Version.new(Parallel::VERSION) < Gem::Version.new('0.4.2')
$LOAD_PATH << File.join(File.dirname(__FILE__), '..', 'lib')
require "parallel_tests"

options = {}
OptionParser.new do |opts|
  opts.banner = <<BANNER
Run all tests in parallel, giving each process ENV['TEST_ENV_NUMBER'] ('', '2', '3', ...)

[optional] Only run selected files & folders:
    parallel_test test/bar test/baz/xxx_text.rb

Options are:
BANNER
  opts.on("-n [PROCESSES]", Integer, "How many processes to use, default: available CPUs"){|n| options[:count] = n }
  opts.on("-p", '--path [PATH]', "run tests inside this path only"){|path| options[:path_prefix] = path }
  opts.on("--no-sort", "do not sort files before running them"){ |no_sort| options[:no_sort] = no_sort }
  opts.on("-m [FLOAT]", "--multiply-processes [FLOAT]", Float, "use given number as a multiplier of processes to run"){ |multiply| options[:multiply] = multiply }
  opts.on("-r", '--root [PATH]', "execute test commands from this path"){|path| options[:root] = path }
  opts.on("-e", '--exec [COMMAND]', "execute this code parallel and with ENV['TEST_ENV_NUM']"){|path| options[:execute] = path }
  opts.on("-o", "--test-options '[OPTIONS]'", "execute test commands with those options"){|arg| options[:test_options] = arg }
  opts.on("-t", "--type [TYPE]", "which type of tests to run? test, spec or features"){|type| options[:type] = type }
  opts.on("--non-parallel", "execute same commands but do not in parallel, needs --exec"){|type| options[:non_parallel] = true }
  opts.on('-v', '--version', 'Show Version'){ puts ParallelTests::VERSION; exit}
  opts.on("-h", "--help", "Show this.") { puts opts; exit }
end.parse!

# get files to run from arguments
options[:files] = ARGV if ARGV.size > 0

num_processes = options[:count] || Parallel.processor_count
num_processes = num_processes * (options[:multiply] || 1)

if options[:execute]
  runs = (0...num_processes).to_a
  results = if options[:non_parallel]
    runs.map do |i|
      ParallelTests.execute_command(options[:execute], i)
    end
  else
    Parallel.map(runs, :in_processes => num_processes) do |i|
      ParallelTests.execute_command(options[:execute], i)
    end
  end.flatten
  abort if results.any?{|r| r[:exit_status] != 0 }
else
  lib, name, task = {
    'test' => ["tests", "test", "test"],
    'spec' => ["specs", "spec", "spec"],
    'features' => ["cucumber", "feature", "features"]
  }[options[:type]||'test']

  require "parallel_#{lib}"
  klass = eval("Parallel#{lib.capitalize}")

  start = Time.now

  tests_folder = File.join(task, options[:path_prefix].to_s)
  tests_folder = File.join(options[:root], tests_folder) unless options[:root].to_s.empty?

  groups = klass.tests_in_groups(options[:files] || tests_folder, num_processes, :no_sort => options[:no_sort])
  num_processes = groups.size

  #adjust processes to groups
  abort "no #{name}s found!" if groups.size == 0

  num_tests = groups.inject(0){|sum,item| sum + item.size }
  puts "#{num_processes} processes for #{num_tests} #{name}s, ~ #{num_tests / groups.size} #{name}s per process"

  test_results = Parallel.map(groups, :in_processes => num_processes) do |group|
    klass.run_tests(group, groups.index(group), options[:test_options])
  end

  #parse and print results
  results = klass.find_results(test_results.map{|result| result[:stdout] }*"")
  puts ""
  puts "Results:"
  results.each{|r| puts r }

  #report total time taken
  puts ""
  puts "Took #{Time.now - start} seconds"

  #exit with correct status code so rake parallel:test && echo 123 works
  failed = test_results.any?{|result| result[:exit_status] != 0 }
  abort "#{name.capitalize}s Failed" if failed
end