module ApplicationHelper
    module Amp::Components::AdTagHelper

        def amp_ad network = AmpHtml.ad_default_network, options = {}, &block
            options = options.symbolize_keys

            options[:type] = network
            options[:width], options[:height] = extract_dimensions(options.delete(:size)) if options[:size]
            warn 'WARNING (AMP): specify width and height of amp-ad tags.' unless options[:width] && options[:height]

            options[:layout] = 'responsive' unless options[:layout] != 'responsive'
            content_tag('amp-ad', options)

            if block_given?
                content_tag 'amp-ad', capture(&block), options
            else
                if options[:sticky] == true
                    options.delete :sticky
                    sticky = {}
                    sticky[:layout] = 'nodisplay'
                    content_tag('amp-sticky-ad', sticky) do
                        content_tag 'amp-ad', options
                    end
                elsif options[:placeholder]
                    placeholder = options[:placeholder]
                    options.delete :placeholder
                    content_tag('amp-ad', options) do
                        placeholder = options[:src] = path_to_image source, skip_pipeline: options.delete(:skip_pipeline)
                        amp_placeholder 'amp-img', options
                    end
                elsif options[:fallback]
                    fallback = options[:fallback]
                    options.delete :fallback
                    content_tag('amp-ad', options) do
                        fallback = options[:src] = path_to_image source, skip_pipeline: options.delete(:skip_pipeline)
                        amp_fallback 'amp-img', options
                    end
                else
                    content_tag 'amp-ad', nil, options
                end
            end
        end

        def amp_embed network = AmpHtml.ad_default_network, options = {}, &block
            amp_ad network, options, capture(&block)
        end

        def amp_auto_ads network = AmpHtml.auto_ads_default_network, options = {}
            options = options.symbolize_keys

            options[:type] = network
            content_tag 'amp-auto-ads', options
        end

        # ## Removed because it depends on Iframe Component
        # ## Propably moving into Iframe Component
        # def amp_video_ad(source, poster, options = {})
        #     options = options.symbolize_keys
        #
        #     options[:poster] = poster
        #     amp_iframe(source, options)
        # end

        def amp_custom_ad name
            options = {}
            options[:name] = name
            options[:content] = request.original_url + '/remote.html'
            tag 'meta', options
        end

        private

        def extract_dimensions size
            size = size.to_s
            if /\A\d+x\d+\z/.match? size
                size.split("x")
            elsif /\A\d+\z/.match? size
                [size, size]
            end
        end

    end
end