module Preact
  module ViewHelper
    def self.included(base)
      base.include Isomorfeus::AssetManager::ViewHelper
    end

    def cached_mount_component(component_name, props = {}, skip_ssr: false, use_ssr: false, refresh: false)
      key = "#{Isomorfeus.current_user}#{component_name}#{props}"
      if !Isomorfeus.development? && !refresh
        render_result, @_ssr_styles, status = component_cache.fetch(key)
        Isomorfeus.ssr_response_status = status
        return render_result if render_result
      end
      render_result = mount_component(component_name, props, asset_key, skip_ssr: skip_ssr, use_ssr: use_ssr)
      status = ssr_response_status
      component_cache.store(key, render_result, ssr_styles, status) if status >= 200 && status < 300
      render_result
    end

    def mount_component(component_name, props = {}, skip_ssr: false, use_ssr: false)
      ssr_start_time = Time.now if Isomorfeus.development?
      @ssr_styles = nil
      render_result = "<div data-iso-env=\"#{Isomorfeus.env}\" data-iso-root=\"#{component_name}\" data-iso-props='#{Oj.dump(props, mode: :strict)}'"
      if !skip_ssr && (Isomorfeus.server_side_rendering || use_ssr)
        location_host = props[:location_host] ? props[:location_host] : 'localhost'
        location = "#{props[:location_scheme] || 'http:'}//#{location_host}#{props[:location]}"

        rendered_tree, application_state, @_ssr_styles = Isomorfeus::PreactSSR.mount_component(component_name, props, Thread.current[:isomorfeus_session_id], location, props[:locale])

        render_result << " data-iso-hydrated='true'" if rendered_tree
        if Isomorfeus.respond_to?(:current_user) && Isomorfeus.current_user && !Isomorfeus.current_user.anonymous?
          render_result << " data-iso-usids=#{Oj.dump(Isomorfeus.current_user.sid.to_s, mode: :strict)}"
        end
        render_result << " data-iso-nloc='#{props[:locale]}'>"
        render_result << (rendered_tree ? rendered_tree : "SSR didn't work")
      else
        if Isomorfeus.respond_to?(:current_user) && Isomorfeus.current_user && !Isomorfeus.current_user.anonymous?
          render_result << " data-iso-usids=#{Oj.dump(Isomorfeus.current_user.sid.to_s, mode: :strict)}"
        end
        render_result << " data-iso-nloc='#{props[:locale]}'>"
      end
      render_result << '</div>'
      if Isomorfeus.server_side_rendering && !skip_ssr
        render_result = "<script type='application/javascript'>\nServerSideRenderingStateJSON = #{Oj.dump(application_state, mode: :strict)}\n</script>\n" << render_result
        puts "Preact::ViewHelper Server Side Rendering took ~#{((Time.now - ssr_start_time)*1000).to_i}ms" if Isomorfeus.development?
      end
      render_result
    end

    def ssr_response_status
      Isomorfeus.ssr_response_status
    end

    def ssr_styles
      @_ssr_styles || ''
    end

    private

    def component_cache
      @_component_cache ||= Isomorfeus.component_cache_init_block.call
    end

    def ssr_mod
      @_ssr_mod ||= Opal.compile(File.read(File.expand_path(File.join(File.dirname(__FILE__), 'ssr.rb'))), { use_strict: true })
    end

    def top_level_mod
      @_top_level_mod ||= Opal.compile(File.read(File.expand_path(File.join(File.dirname(__FILE__), 'top_level_ssr.rb'))), { use_strict: true })
    end
  end
end