require "commands/knife_commands"

class KnifeFactory

  @instance = nil
  class << self
    def init
      c = DevopsConfig.config[:knife_config_file]
      raise "Option ':knife_config_file' is undefined or is not a Hash({key => config}), please check config.rb file" unless c.is_a?(Hash)
      @instance = {}
      c.each do |key, config|
        @instance[key] = KnifeCommands.new(config)
        DevopsLogger.logger.info("Knife #{key} instance has been initialized with config '#{config}'")
      end
    end

    def instance key
      res = @instance[key]
      raise Devops::Exception::KnifeConfigError.new "Can not find configuration for chef environment '#{key}'" if res.nil?
      res
    end

    def keys
      @instance.keys
    end
  end
end