module Sprout::Generator
    class Command
      attr_accessor :logger
      attr_accessor :working_dir

      def initialize generator
        @generator             = generator
        @working_dir           = DirectoryManifest.new
        @working_dir.generator = generator
        @working_dir.path      = generator.path
      end

      def directory path, &block
        raise Sprout::Errors::GeneratorError.new "Cannot create directory with nil path" if path.nil?
        manifest           = DirectoryManifest.new
        manifest.generator = @generator
        manifest.path      = File.join(@working_dir.path, path)
        @working_dir.children << manifest
        parent             = @working_dir
        @working_dir       = manifest
        yield if block_given?
        @working_dir       = parent
      end

      def template path, template=nil
        raise Sprout::Errors::GeneratorError.new "Cannot create file with nil path" if path.nil?
        manifest           = TemplateManifest.new
        manifest.generator = @generator
        manifest.path      = File.join( working_dir.path, path )
        manifest.template  = template
        manifest.templates = @generator.template_paths
        working_dir.children << manifest
      end

      def file path, template=nil
        raise sprout::errors::generatorerror.new "Cannot create file with nil path" if path.nil?
        manifest           = FileManifest.new
        manifest.generator = @generator
        manifest.path      = File.join( working_dir.path, path )
        manifest.template  = template
        manifest.templates = @generator.template_paths
        working_dir.children << manifest
      end

      def generator name, options={}
        raise sprout::errors::generatorerror.new "Cannot call another generator with nil name" if name.nil?
        instance        = Sprout::Generator.create_instance name, options
        instance.logger = logger
        instance.path   = working_dir.path
        instance.from_hash options
        working_dir.generators << instance
      end

      def execute
        begin
          working_dir.create
        rescue StandardError => e
          @generator.say "[#{e.class}] #{e.message}"
          working_dir.children.each do |child|
            child.destroy
          end
          raise e
        end
      end

      def unexecute
        working_dir.destroy
      end
    end
end