module Puma
  class Configuration
    DefaultRackup = "config.ru"

    DefaultTCPHost = "0.0.0.0"
    DefaultTCPPort = 9292

    def initialize(options)
      @options = options
      @options[:binds] ||= []
    end

    attr_reader :options

    def load
      if path = @options[:config_file]
        DSL.new(@options)._load_from path
      end

      # Rakeup default option support
      if host = @options[:Host]
        port = @options[:Port] || DefaultTCPPort

        @options[:binds] << "tcp://#{host}:#{port}"
      end

      if @options[:binds].empty?
        @options[:binds] << "tcp://#{DefaultTCPHost}:#{DefaultTCPPort}"
      end

      if @options[:control_url] == "auto"
        path = Configuration.temp_path
        @options[:control_url] = "unix://#{path}"
        @options[:control_url_temp] = path
      end

      unless @options[:control_auth_token]
        setup_random_token
      end
    end

    # Load the specified rackup file, pull an options from
    # the rackup file, and set @app.
    #
    def app
      if app = @options[:app]
        return app
      end

      path = @options[:rackup] || DefaultRackup

      unless File.exists?(path)
        raise "Missing rackup file '#{path}'"
      end

      app, options = Rack::Builder.parse_file path
      @options.merge! options

      options.each do |key,val|
        if key.to_s[0,4] == "bind"
          @options[:binds] << val
        end
      end

      unless @options[:quiet]
        app = Rack::CommonLogger.new(app, STDOUT)
      end

      return app
    end

    def setup_random_token
      begin
        require 'openssl'
      rescue LoadError
      end

      count = 16

      bytes = nil

      if defined? OpenSSL::Random
        bytes = OpenSSL::Random.random_bytes(count)
      elsif File.exists?("/dev/urandom")
        File.open("/dev/urandom") do |f|
          bytes = f.read(count)
        end
      end

      if bytes
        token = ""
        bytes.each_byte { |b| token << b.to_s(16) }
      else
        token = (0..count).to_a.map { rand(255).to_s(16) }.join
      end

      @options[:control_auth_token] = token
    end

    def self.temp_path
      require 'tmpdir'

      t = (Time.now.to_f * 1000).to_i
      "#{Dir.tmpdir}/puma-status-#{t}-#{$$}"
    end

    # The methods that are available for use inside the config file.
    #
    class DSL
      def initialize(options)
        @options = options
      end

      def _load_from(path)
        instance_eval File.read(path), path, 1
      end

      # Use +obj+ or +block+ as the Rack app. This allows a config file to
      # be the app itself.
      #
      def app(obj=nil, &block)
        obj ||= block

        raise "Provide either a #call'able or a block" unless obj

        @options[:app] = obj
      end

      # Start the Puma control rack app on +url+. This app can be communicated
      # with to control the main server.
      #
      def activate_control_app(url="auto", opts=nil)
        @options[:control_url] = url

        if opts
          if tok = opts[:auth_token]
            @options[:control_auth_token] = tok
          end

          if opts[:no_token]
            @options[:control_auth_token] = :none
          end
        end
      end

      # Bind the server to +url+. tcp:// and unix:// are the only accepted
      # protocols.
      #
      def bind(url)
        @options[:binds] << url
      end

      # Store the pid of the server in the file at +path+.
      def pidfile(path)
        @options[:pidfile] = path
      end

      # Disable request logging.
      #
      def quiet
        @options[:quiet] = true
      end

      # Load +path+ as a rackup file.
      #
      def rackup(path)
        @options[:rackup] = path.to_s
      end

      # Configure +min+ to be the minimum number of threads to use to answer
      # requests and +max+ the maximum.
      #
      def threads(min, max)
        if min > max
          raise "The minimum number of threads must be less than the max"
        end

        @options[:min_threads] = min
        @options[:max_threads] = max
      end

      # Use +path+ as the file to store the server info state. This is
      # used by pumactl to query and control the server.
      #
      def state_path(path)
        @options[:state] = path.to_s
      end
    end
  end
end