require 'em-websocket'
require 'multi_json'
require 'thread'

module Guard
  class LiveReload
    class Reactor

      attr_reader :thread, :web_sockets

      def initialize(options)
        @mutex = Mutex.new
        @web_sockets = []
        @options     = options
        @thread      = start_threaded_reactor(options)
      end

      def stop
        thread.kill
      end

      def reload_browser(paths = [])
        @mutex.synchronize do
          UI.info "Reloading browser: #{paths.join(' ')}"
          paths.each do |path|
            data = MultiJson.encode(['refresh', {
              :path           => "#{Dir.pwd}/#{path}",
              :apply_js_live  => @options[:apply_js_live],
              :apply_css_live => @options[:apply_css_live]
            }])
            UI.debug data
            @web_sockets.each { |ws| ws.send(data) }
          end
        end
      end

    private

      def start_threaded_reactor(options)
        Thread.new do
          EventMachine.run do
            UI.info "LiveReload #{options[:api_version]} is waiting for a browser to connect."
            EventMachine.start_server(options[:host], options[:port], EventMachine::WebSocket::Connection, {}) do |ws|
              ws.onopen do
                @mutex.synchronize do
                  begin
                    UI.info "Browser connected."
                    ws.send "!!ver:#{options[:api_version]}"
                    @web_sockets << ws
                  rescue
                    UI.errror $!
                    UI.errror $!.backtrace
                  end
                end
              end

              ws.onmessage do |msg|
                UI.info "Browser URL: #{msg}"  if msg =~ /^(https?|file):/
              end

              ws.onclose do
                @mutex.synchronize do
                  @web_sockets.delete ws
                  UI.info "Browser disconnected."
                end
              end
            end
          end
        end
      end

    end
  end
end