module Trinidad

  class Server
    attr_reader :tomcat, :config

    def initialize(config = Trinidad.configuration)
      load_config(config)
      load_tomcat_server
      apps = create_web_apps
      load_host_monitor(apps)
    end

    def load_config(config)
      @config = config
      add_default_web_app!(config)
    end

    def load_tomcat_server
      @tomcat = Trinidad::Tomcat::Tomcat.new
      @tomcat.base_dir = Dir.pwd
      @tomcat.hostname = @config[:address] || 'localhost'
      @tomcat.server.address = @config[:address]
      @tomcat.port = @config[:port].to_i
      create_hosts
      @tomcat.enable_naming

      add_http_connector if http_configured?
      add_ssl_connector if ssl_enabled?
      add_ajp_connector if ajp_enabled?

      @tomcat = Trinidad::Extensions.configure_server_extensions(@config[:extensions], @tomcat)
    end

    def create_hosts
      if @config[:hosts]
        @config[:hosts].each do |apps_base, names|
          create_host(apps_base, names)
        end

        set_default_host
      elsif @config[:web_apps]
        # create the hosts when they are specified for each app into
        # web_apps. We must create them before creating the
        # applications.
        @config[:web_apps].each do |name, app_config|
          if host_names = app_config.delete(:hosts)
            dir = app_config[:web_app_dir] || Dir.pwd
            apps_base = File.dirname(dir) == '.' ? dir : File.dirname(dir)
            app_config[:host] = create_host(apps_base, host_names)
          end

          set_default_host
        end
      else
        @tomcat.host.app_base = @config[:apps_base] || Dir.pwd
      end
    end

    def create_web_apps
      apps = []
      apps << create_from_web_apps
      apps << create_from_apps_base

      apps.flatten.compact
    end

    def load_host_monitor(apps)
      @tomcat.engine.find_children.each do |host|
        host.add_lifecycle_listener(Trinidad::Lifecycle::Host.new(@tomcat, *apps))
      end
    end

    def create_from_web_apps
      if @config[:web_apps]
        @config[:web_apps].map do |name, app_config|
          app_config[:context_path] ||= (name.to_s == 'default' ? '' : "/#{name.to_s}")
          app_config[:web_app_dir]  ||= Dir.pwd

          create_web_app(app_config)
        end
      end
    end

    def create_from_apps_base
      if @config[:apps_base] || @config[:hosts]
        @tomcat.engine.find_children.map do |host|
          apps_base = host.app_base

          apps_path = Dir.glob(File.join(apps_base, '*')).
            select {|path| !(path =~ /tomcat\.\d+$/) }

          apps_path.reject! {|path| apps_path.include?(path + '.war') }

          apps_path.map do |path|
            if (File.directory?(path) || path =~ /\.war$/)
              name = File.basename(path)
              app_config = {
                :context_path => (name == 'default' ? '' : "/#{name.to_s}"),
                :web_app_dir  => File.expand_path(path),
                :host         => host
              }

              create_web_app(app_config)
            end
          end
        end.flatten
      end
    end

    def create_web_app(app_config)
      web_app = WebApp.create(@config, app_config)

      app_context = @tomcat.addWebapp(app_config[:host] || @tomcat.host, web_app.context_path, web_app.web_app_dir)

      Trinidad::Extensions.configure_webapp_extensions(web_app.extensions, @tomcat, app_context)

      app_context.add_lifecycle_listener(web_app.define_lifecycle)

      {:context => app_context, :app => web_app, :monitor => web_app.monitor}
    end

    def add_service_connector(options, protocol = nil)
      connector = Trinidad::Tomcat::Connector.new(protocol)
      opts = options.dup

      connector.scheme = opts.delete(:scheme) if opts[:scheme]
      connector.secure = opts.delete(:secure) || false
      connector.port = opts.delete(:port).to_i

      connector.protocol_handler_class_name = opts.delete(:protocol_handler) if opts[:protocol_handler]

      opts.each do |key, value|
        connector.setProperty(key.to_s, value.to_s)
      end

      @tomcat.service.add_connector(connector)
      connector
    end

    def add_ajp_connector
      add_service_connector(@config[:ajp], 'AJP/1.3')
    end

    def add_ssl_connector
      options = @config[:ssl].merge({
        :scheme => 'https',
        :secure => true,
        :SSLEnabled => 'true'
      })

      options[:keystoreFile] ||= options.delete(:keystore)

      if !options[:keystoreFile] && !options[:SSLCertificateFile]
        options[:keystoreFile] = 'ssl/keystore'
        options[:keystorePass] = 'waduswadus'
        create_default_keystore(options)
      end

      add_service_connector(options)
    end

    def add_http_connector
      options = @config[:http] || {}
      options[:address] ||= @config[:address] if @config[:address] != 'localhost'
      options[:port] = @config[:port]
      options[:protocol_handler] = 'org.apache.coyote.http11.Http11NioProtocol' if options[:nio]

      if options[:apr]
        @tomcat.server.add_lifecycle_listener(Trinidad::Tomcat::AprLifecycleListener.new)
      end

      connector = add_service_connector(options, options[:protocol_handler] || 'HTTP/1.1')
      @tomcat.connector = connector
    end

    def ssl_enabled?
      @config[:ssl] && !@config[:ssl].empty?
    end

    def ajp_enabled?
      @config[:ajp] && !@config[:ajp].empty?
    end

    def http_configured?
      (@config[:http] && !@config[:http].empty?) || @config[:address] != 'localhost'
    end

    def create_default_keystore(config)
      keystore_file = java.io.File.new(config[:keystoreFile])

      if (!keystore_file.parent_file.exists &&
              !keystore_file.parent_file.mkdir)
          raise "Unable to create keystore folder: " + keystore_file.parent_file.canonical_path
      end

      keytool_args = ["-genkey",
        "-alias", "localhost",
        "-dname", "CN=localhost, OU=Trinidad, O=Trinidad, C=ES",
        "-keyalg", "RSA",
        "-validity", "365",
        "-storepass", "key",
        "-keystore", config[:keystoreFile],
        "-storepass", config[:keystorePass],
        "-keypass", config[:keystorePass]]

      Trinidad::Tomcat::KeyTool.main(keytool_args.to_java(:string))
    end

    def start
      trap_signals if @config[:trap]

      @tomcat.start
      @tomcat.server.await
    end

    def stop
      @tomcat.stop
      @tomcat.destroy
    end

    private

    def create_host(apps_base, names)
      host_names = Array(names)
      host_name = host_names.shift
      unless host = @tomcat.engine.find_child(host_name)
        host = Trinidad::Tomcat::StandardHost.new
        host.name = host_name
        host.app_base = apps_base || Dir.pwd
        host_names.each {|h| host.add_alias(h) } unless host_names.empty?

        @tomcat.engine.add_child host
      end
      host
    end

    def set_default_host
      # FIXME: Remove when the issue below is solved.
      # workaround to solve this Tomcat issue: https://issues.apache.org/bugzilla/show_bug.cgi?id=52387
      @tomcat.host = @tomcat.engine.find_children.first
    end

    def add_default_web_app!(config)
      if (!config[:web_apps] && !config[:apps_base] && !config[:hosts])
        default_app = {
          :context_path => config[:context_path],
          :web_app_dir => config[:web_app_dir] || Dir.pwd,
          :log => config[:log]
        }
        default_app[:rackup] = config[:rackup] if config[:rackup]

        config[:web_apps] = { :default => default_app }
      end
    end

    def trap_signals
      trap('INT') { stop }
      trap('TERM') { stop }
    end
  end
end