module LaunchAgent
  module CLI
    class OptionParser
      def initialize(opts, argv)
        @opts = opts
        @argv = argv

        if @argv[0] == '--'
          @argv.shift
        end
      end

      def agent
        raise 'full command must be supplied' if @argv.empty?

        daemon      = @opts['--daemon']
        interval    = @opts['--interval']
        env         = (@opts['--env'] || '').split(',')
        wdir        = @opts['--wdir']
        stdout_path = @opts['--stdout']
        stderr_path = @opts['--stderr']
        agent       = nil

        if daemon
          agent = LaunchAgent::Daemon.new(*@argv)
        elsif interval
          agent = LaunchAgent::Periodic.new(interval.to_i, *@argv)
        else
          raise 'at least one of --daemon and --interval must be set'
        end

        agent['EnvironmentVariables'] = env.inject({}) do |memo, e|
          k, v = e.split('=')
          memo[k] = v
          memo
        end

        if wdir
          agent['WorkingDirectory'] = File.expand_path(wdir)
        end

        if stdout_path
          agent['StandardOutPath'] = File.expand_path(stdout_path)
        end

        if stderr_path
          agent['StandardErrorPath'] = File.expand_path(stderr_path)
        end

        agent
      end
    end
  end
end