require 'fog'

module Stackster
  class AWS
    class CloudFormation

      def initialize(args)
        @config = args[:config]
        @logger = @config.logger
        @connect = Fog::AWS::CloudFormation.new :aws_access_key_id     => @config.access_key,
                                                :aws_secret_access_key => @config.secret_key,
                                                :region                => @config.region
      end

      def create(args)
        parameters = { 'Parameters' => args[:parameters] }
        data = { 'Capabilities' => ['CAPABILITY_IAM'],
                 'TemplateBody' => args[:template] }.merge parameters
        begin
          @connect.create_stack(args[:name], data)
        rescue Exception => e  
          Error.new(:config    => @config,
                    :exception => e).process
        end
        @logger.info "Cloud Formation stack creation completed."
      end

      def update(args)
        parameters = { 'Parameters' => args[:parameters] }
        data = { 'Capabilities' => ['CAPABILITY_IAM'],
                 'TemplateBody' => args[:template] }.merge parameters
        begin
          @connect.update_stack(args[:name], data)
        rescue Exception => e  
          Error.new(:config    => @config,
                    :exception => e).process
        end
        @logger.info "Cloud Formation stack update completed."
      end

      def destroy(name)
        begin
          @connect.delete_stack name
        rescue Exception => e  
          Error.new(:config    => @config,
                    :exception => e).process
        end
        @logger.info "Cloud Formation stack destroy completed."
      end

      def describe_stack(name)
        @connect.describe_stacks('StackName' => name).body['Stacks']
      end

      def stack_resources(name)
        @connect.describe_stack_resources('StackName' => name).body['StackResources']
      end

      def stack_events(name, limit)
        @connect.describe_stack_events(name).body['StackEvents'] [0..limit-1]
      end

      def stack_status(name)
        describe_stack(name).first['StackStatus']
      end

      def stack_outputs(name)
        describe_stack(name).last['Outputs']
      end

      def template(name)
        @connect.get_template(name).body['TemplateBody']
      end

    end
  end
end