require 'tilt'
require 'yaml'

module MagLove
  module Tilt
    class TwigTemplate < ::Tilt::Template
      self.default_mime_type = 'theme/html'

      def initialize_engine
        install_php_dependencies
      end

      def prepare; end

      def evaluate(scope, locals, &block)
        return @output if not @output.nil?
        yaml_file     = Tempfile.new(['context-', '.yml'])
        yaml_data     = locals.merge(scope.is_a?(Hash) ? scope : {}).stringify_keys
        begin
          File.open(yaml_file.path, 'w'){|file| file.write(yaml_data.to_yaml)}
          @output = `php #{binary_path} render -d '#{File.dirname(file)}' -y '#{yaml_file.path}' '#{File.basename(file)}'`
        rescue
          raise
        ensure
          yaml_file.close
          yaml_file.unlink
        end
      end

      private
      
        def install_php_dependencies
          if !File.exists?(binary_path)
            require 'open-uri'
            File.open(binary_path, "wb") do |saved_file|
              open("https://github.com/MagLoft/twigster/raw/master/twigster.phar", "rb") do |read_file|
                saved_file.write(read_file.read)
              end
            end
          end
        end
        
        def binary_path
          File.join(Gem.datadir("maglove"), "twigster.phar")
        end
    end

  end
end