# encoding: utf-8
#
# This file is part of the mbrao gem. Copyright (C) 2013 and above Shogun <shogun@cowtech.it>.
# Licensed under the MIT license, which can be found at https://choosealicense.com/licenses/mit.
#

# :nodoc:
module ActionView
  # :nodoc:
  class Template
    # :nodoc:
    module Handlers
      # Class for rendering mbrao contents in Rails.
      class MbraoTemplate
        # Returns a unique (singleton) instance of the template handler.
        #
        # @param force [Boolean] If to force recreation of the instance.
        # @return [MbraoTemplate] The unique (singleton) instance of the template handler.
        def self.instance(force = false)
          @instance = nil if force
          @instance ||= ActionView::Template::Handlers::MbraoTemplate.new
        end

        # Register Mbrao into Rails.
        def self.register
          ActionView::Template.register_template_handler("emt", instance) if defined?(ActionView) && defined?(Rails) && Rails.version =~ /^[34]/
        end

        # Renders a template into a renderer context.
        #
        # @param renderer [Object] The renderer context.
        # @param template [String] The template to render.
        # @return [String] The rendered template.
        def render(renderer, template)
          content = ::Mbrao::Parser.parse(template)
          controller = renderer.controller

          controller.instance_variable_set(:@mbrao_content, content)
          controller.define_singleton_method(:mbrao_content) { @mbrao_content }
          controller.class.send(:helper_method, :mbrao_content)

          ::Mbrao::Parser.render(content, {engine: content.metadata[:engine], locale: controller.params[:locale]})
        end

        # Declares support for streaming.
        #
        # @return [TrueClass] Declares support for streaming.
        def supports_streaming?
          true
        end

        # Method called to render a template.
        #
        # @param template [ActionView::Template] The template to render.
        # @return [String] A Ruby snippet to execute to render the template.
        def call(template)
          "ActionView::Template::Handlers::MbraoTemplate.instance.render(self, #{template.source.to_json})"
        end
      end
    end
  end
end

ActionView::Template::Handlers::MbraoTemplate.register