module RunLoop
  # @!visibility private
  module DeviceAgent
    # @!visibility private
    class Runner

      # @!visibility private
      @@cbxdevice = nil

      # @!visibility private
      @@cbxsim = nil

      # @!visibility private
      def self.device_agent_dir
        @@device_agent_dir ||= File.expand_path(File.dirname(__FILE__))
      end

      # @!visibility private
      def self.detect_cbxsim
        @@cbxsim ||= begin
          from_env = RunLoop::Environment.cbxsim

          if from_env
            if File.exist?(from_env)
              from_env
            else
              raise RuntimeError, %Q[
CBXSIM environment variable defined:

  #{from_env}

but runner does not exist at that path.
]
            end
          else
            self.default_cbxsim
          end
        end
      end

      # @!visibility private
      def self.detect_cbxdevice
        @@cbxdevice ||= begin
          from_env = RunLoop::Environment.cbxdevice

          if from_env
            if File.exist?(from_env)
              from_env
            else
              raise RuntimeError, %Q[
CBXDEVICE environment variable defined:

  #{from_env}

but runner does not exist at that path.
]
            end
          else
            self.default_cbxdevice
          end
        end
      end

      # @!visibility private
      def self.default_cbxdevice
        cbx = File.join(self.device_agent_dir, "ipa", "DeviceAgent-Runner.app")

        if !File.exist?(cbx)
          self.expand_runner_archive("#{cbx}.zip")
        else
          cbx
        end
      end

      # @!visibility private
      def self.default_cbxsim
        cbx = File.join(self.device_agent_dir, "app", "DeviceAgent-Runner.app")

        if !File.exist?(cbx)
          self.expand_runner_archive("#{cbx}.zip")
        else
          cbx
        end
      end

      # @!visibility private
      def self.expand_runner_archive(archive)
        dir = File.dirname(archive)
        options = { :log_cmd => true }
        Dir.chdir(dir) do
          Shell.run_shell_command(["ditto", "-xk", File.basename(archive), "."], options)
        end
        File.join(dir, "DeviceAgent-Runner.app")
      end

      # @!visibility private
      attr_reader :device

      # @!visibility private
      # @param [RunLoop::Device] device the target device
      def initialize(device)
        @device = device
      end

      # @!visibility private
      def runner
        @runner ||= begin
          if device.physical_device?
            RunLoop::DeviceAgent::Runner.detect_cbxdevice
          else
            RunLoop::DeviceAgent::Runner.detect_cbxsim
          end
        end
      end

      # @!visibility private
      def tester
        @tester ||= File.join(runner, "PlugIns", "DeviceAgent.xctest")
      end

      # @!visibility private
      def version
        @version ||= lambda do
          short = pbuddy.plist_read("CFBundleShortVersionString", info_plist)
          build = pbuddy.plist_read("CFBundleVersion", info_plist)
          str = "#{short}.pre#{build}"
          RunLoop::Version.new(str)
        end.call
      end

      private

      # @!visibility private
      def info_plist
        @info_plist ||= File.join(runner, "Info.plist")
      end

      # @!visibility private
      def pbuddy
        @pbuddy ||= RunLoop::PlistBuddy.new
      end
    end
  end
end