module LearnOpen
  module Environments
    def self.classify(options)
      environment_vars = options.fetch(:environment_vars, LearnOpen.environment_vars)
      platform = options.fetch(:platform, LearnOpen.platform)
      if jupyter_container?(environment_vars)
        JupyterContainerEnvironment.new(options)
      elsif ide_environment?(environment_vars)
        IDEEnvironment.new(options)
      elsif on_mac?(platform)
        MacEnvironment.classify(options)
      elsif on_linux?(platform)
        LinuxEnvironment.new(options)
      else
        GenericEnvironment.new(options)
      end
    end

    def self.jupyter_container?(environment_vars)
      environment_vars['JUPYTER_CONTAINER'] == "true"
    end

    def self.ide_environment?(environment_vars)
      environment_vars['IDE_CONTAINER'] == "true"
    end

    def self.on_mac?(platform)
      !!platform.match(/darwin/)
    end

    def self.on_linux?(platform)
      !!platform.match(/linux/)
    end

    class UnknownLessonDownloadError < StandardError
    end
  end
end