Class: Mbrao::RenderingEngines::HtmlPipeline

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# File 'lib/mbrao/rendering_engines/html_pipeline.rb', line 18

class HtmlPipeline < Mbrao::RenderingEngines::Base
  attr_accessor :default_pipeline
  attr_accessor :default_options

  # Renders a content.
  #
  # @param content [Content|String] The content to parse.
  # @param options [Hash] A list of options for renderer.
  # @param context [Hash] A context for rendering.
  def render(content, options = {}, context = {})
    options = sanitize_options(options)
    context = context.ensure_hash(:symbols)

    begin
      create_pipeline(options, context).call(get_body(content, options))[:output].to_s
    rescue Mbrao::Exceptions::UnavailableLocalization => le
      raise le
    rescue => e
      raise ::Mbrao::Exceptions::Rendering, e.to_s
    end
  end

  # Gets the default pipeline.
  #
  # @return [Array] The default pipeline.
  def default_pipeline
    @default_pipeline || [[:kramdown], [:table_of_contents, :toc], [:autolink, :links], [:emoji], [:image_max_width]]
  end

  # Sets the default pipeline.
  #
  # @return [Array] The default pipeline.
  def default_pipeline=(value)
    @default_pipeline = value.ensure_array(nil, false, false) { |v| v.ensure_array(nil, true, true, true) { |p| p.ensure_string.to_sym } }
  end

  # Gets the default options.
  #
  # @return [Hash] The default options.
  def default_options
    @default_options || {gfm: true, asset_root: "/"}
  end

  # Sets the default options.
  #
  # @param value [Object] The new default options.
  def default_options=(value)
    @default_options = value.ensure_hash
  end

  private

  # Sanitizes options.
  #
  # @param options [Hash] The options to sanitize.
  # @return [Hash] The sanitized options.
  def sanitize_options(options)
    options = options.ensure_hash(:symbols)
    options = filter_filters(options)
    options[:pipeline_options] = default_options.merge(options[:pipeline_options].ensure_hash(:symbols))

    options
  end

  # Get body of a content.
  #
  # @param content [Content|String] The content to sanitize.
  # @param options [Hash] A list of options for renderer.
  # @return [Array] The body to parse.
  def get_body(content, options)
    content = ::Mbrao::Content.create(nil, content.ensure_string) unless content.is_a?(::Mbrao::Content)
    content.get_body(options.fetch(:locales, ::Mbrao::Parser.locale).ensure_string)
  end

  # Creates the pipeline for rendering.
  #
  # @param options [Hash] A list of options for renderer.
  # @param context [Hash] A context for rendering.
  # @return [HTML::Pipeline] The pipeline
  def create_pipeline(options, context)
    ::HTML::Pipeline.new(
      options[:pipeline].map { |f| ::Lazier.find_class(f, "::HTML::Pipeline::%CLASS%Filter", true) },
      options[:pipeline_options].merge(context)
    )
  end

  # Filters pipeline filters basing on the options provided.
  #
  # @param options [Hash] The original options.
  # @return [Hash] The options with the new set of filters.
  def filter_filters(options)
    options[:pipeline] = get_pipeline(options)

    default_pipeline.each do |f|
      options[:pipeline].delete(f.first) unless options.fetch(f.last, true)
    end

    options
  end

  # Gets the pipeline for the current options.
  #
  # @param options [Hash] The options to parse.
  # @return [Array] The pipeline to process.
  def get_pipeline(options)
    options.fetch(:pipeline, default_pipeline.map(&:first)).map(&:to_sym)
  end
end