module Lambom
    class Converger
        include ShellMixin
        
        COOKBOOKS_URL = 'http://www2.ruleyourcloud.com/cookbooks.tar.gz'
        
        DEFAULT_CHEF_PATH = '/var/chef'
        
        TEMP = "#{DEFAULT_CHEF_PATH}/cache"
        
        ENV_VARS_DELETE = %w{
                         GEM_PATH 
                         RUBY_VERSION 
                         GEM_HOME 
                         MY_RUBY_HOME
                         rvm_bin_path
                         rvm_path
                         rvm_gem_options
                         rvm_prefix
                         rvm_version
        }

        CHEF_CONF_FILE = '/etc/chef/solo.rb'
        
        CHEF_CONF = {
            development: '
cookbook_path ["/mnt/opscode/cookbooks", "/mnt/others/cookbooks", "/mnt/riyic/cookbooks"]
'
        }

        def initialize(conf, json)
            @conf = conf
            @attributes_json = json
        end


        attr_reader :conf,:attributes_json

        def run
            preparar_entorno

            descargar_cookbooks

            ejecutar_converger
        end


        private

        def ejecutar_converger

            filename = "#{TEMP}/#{conf.server}.json"
            file = File.new(filename,"w")
            file.write(attributes_json)
            file.close

            run_cmd('/usr/bin/chef-solo',
                    '--log_level', conf.loglevel,
                    '--logfile', "#{conf.logdir}/#{conf.logfile}",
                    '-j', filename)

        end

        def preparar_entorno
            ENV_VARS_DELETE.each {|v| ENV.delete(v)}
            ENV["PATH"] = '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'
            
            #creamos directorio de logs
            FileUtils.mkdir_p(conf.logdir) unless Dir.exists?(conf.logdir)
            File.chmod(0750, conf.logdir)

            #creamos o directorio cache de chef
            FileUtils.mkdir_p(TEMP) unless Dir.exists?(TEMP)
            File.chmod(0750,TEMP)

            # establecemos o archivo de configuracion de chef segun o entorno
            switch_chef_conf(conf.environment)
        end

        def descargar_cookbooks
            unless (conf.environment == 'development')
                # aqui podemos meter unha ejecucion de berkshelf para descargar os cookbooks necesarios
                run_cmd('curl','-o','/tmp/cookbooks.tar.gz', '-L',COOKBOOKS_URL)
                FileUtils.mkdir_p(DEFAULT_CHEF_PATH) unless Dir.exists?(DEFAULT_CHEF_PATH)
                run_cmd('tar','xzf','/tmp/cookbooks.tar.gz','--no-same-owner','-C', DEFAULT_CHEF_PATH);
            end
        end

        def switch_chef_conf(env)
            if CHEF_CONF.has_key?(env)
                IO.write(CHEF_CONF_FILE,CHEF_CONF[env])
            end
        end
    end
end