module Locomotive
  module Steam
    module Liquid
      module Filters
        module Base

          protected

          # Convert an array of properties ('key:value') into a hash
          # Ex: ['width:50', 'height:100'] => { width: '50', height: '100' }
          def args_to_options(*args)
            options = {}
            args.flatten.each do |a|
              if (a =~ /^(.*):(.*)$/)
                options[$1.to_sym] = $2
              end
            end
            options
          end

          # Write options (Hash) into a string according to the following pattern:
          # <key1>="<value1>", <key2>="<value2", ...etc
          def inline_options(options = {})
            return '' if options.empty?
            (options.stringify_keys.sort.to_a.collect { |a, b| "#{a}=\"#{b}\"" }).join(' ') << ' '
          end

          # Get the url to be used in html tags such as image_tag, flash_tag, ...etc
          # input: url (String) OR asset drop
          def get_url_from_asset(input)
            input.respond_to?(:url) ? input.url : input
          end

          def css_js_asset_url(input, extension, folder)
            return '' if input.nil?

            if input =~ /^(\/|https?:)/
              uri = URI(input)
            else
              uri = URI(asset_url("#{folder}/#{input}"))
            end

            uri.path = "#{uri.path}#{extension}" unless uri.path.ends_with?(extension)
            uri.to_s
          end

          def asset_url(path)
            @context.registers[:services].theme_asset_url.build(path)
          end

          def absolute_url(url)
            url.starts_with?('/') ? url : "/#{url}"
          end

        end

        ::Liquid::Template.register_filter(Base)

      end
    end
  end
end