module Jammit
  module Config
    
    CONFIG_TEMPLATE = Jammit::ROOT + '/assets.example.yml'
    
    class << self
      
      def dispatch(command, *params)        
        case command
        when :create
          create
        when :set
          set(params.shift, params.shift)
        end
      end
      
      ##
      # load configuration file
      # @param {String} path
      # @param {Boolean} force reloading of config file
      #
      def load(force=false)        
        raise Jammit::ConfigurationNotFound, "could not find the \"#{Jammit.config_path}\" configuration file" unless File.exists?(Jammit.config_path) && File.readable?(Jammit.config_path)        
        if !@config || force == true
          @config = YAML.load(ERB.new(File.read(Jammit.config_path)).result)
        end
        @config
      end
      
  private
      
      ##
      # Write config to file
      #
      def write(config)
        File.open(Jammit.config_path, "w") {|f| 
          f << config.to_yaml
        }  
      end
      
      ##
      # If a config path is given, use that as the root, otherwise use DEFAULT_CONFIG_PATH
      #
      def create        
        if File.exists?(Jammit.config_path)
          raise Jammit::AlreadyConfigured.new(" Config file #{Jammit.config_path} already exists.")
        end
        FileUtils.mkdir_p(File.dirname(Jammit.config_path))
        FileUtils.cp(CONFIG_TEMPLATE, Jammit.config_path)
        
        parts = Jammit.config_path.split('/')
        name = parts.pop
        dir  = parts.pop
        Jammit.ui.confirm(" create #{dir}/#{name}")
      end
      
      ##
      # Set a config property in file
      # @param {String} name
      # @param {String} value
      #
      def set(name, value)
        value = (value == "true") ? true : (value == "false") ? false : value
        
        config = load(true)
        option = config[name]
        
        # careful not to clobber raexisting values if updating a hash
        if value.kind_of?(Hash) && option.kind_of?(Hash)
          value.keys.each do |k|
            option[k] = value[k]
          end
          config.update(name => option)
        else
          config.update(name => value)
        end
        write(config)
        Jammit.ui.confirm(" set #{name}")
      end
    end
  end
end