require "rake/file_utils_ext"
require 'tmpdir'

class ExerciseTestsRunner
  include Rake::FileUtilsExt

  def initialize(exercise:, test_options: '')
    @exercise = exercise
    @test_options = test_options
  end

  def run
    puts "\n\n#{'-'*64}\nrunning tests for: #{exercise}"

    Dir.mktmpdir(exercise.name) do |dir|
      setup_exercise_files_in(dir)
      run_exercise_tests_in(dir)
    end
  end

  private

  attr_reader :exercise, :test_options

  def setup_exercise_files_in(dir)
    FileUtils.cp_r exercise.directory, dir
    FileUtils.mv "#{dir}/#{exercise.example_file}", "#{dir}/#{exercise.testable_example_file}"
  end

  def run_exercise_tests_in(dir)
    ruby "-I lib -r disable_skip.rb #{dir}/#{exercise.test_file} #{test_options}"
  end
end