require "ecr/macros"
require "html"
require "../../page-features"

module Guff
  class PageHTMLView
    property :charset
    property :lang
    property :title
    property :body
    property :scripts
    property :styles
    property :metas
    property :body_id
    property :body_class

    FORMATS = {
      attr:   "%s='%s'",
      meta:   "<meta %s/>",
      style:  "<link rel='stylesheet' type='text/css' href='%s'/>",
      script: "<script type='text/javascript' src='%s'></script>",
    }

    def initialize(@title : String = "", @body : String = "")
      @charset = "utf-8"
      @lang = "en-US"
      @scripts = [] of String
      @styles = [] of String
      @metas = [] of Hash(String, String)
      @features = {} of String => Bool
    end

    def body_attrs
      r = {
        "id":     @body_id,
        "class":  @body_class,
      }.map { |k, v| attr(k, v) }.join(" ").strip

      # prefix with space if content
      " " + r if r.size > 0
    end

    def page_headers : String
      (@metas.map { |meta|
        FORMATS[:meta] % [meta.map { |k, v| attr(k, v) }.join(" ")]
      } + @styles.map { |path|
        FORMATS[:style] % [h(path)]
      }).join("")
    end

    def page_footers : String
      @scripts.map { |path|
        FORMATS[:script] % [h(path)]
      }.join("")
    end

    def h(s : String?) : String
      s ? HTML.escape(s) : ""
    end

    def attr(k : String, v : String?) : String
      v ? FORMATS[:attr] % [k, h(v)] : ""
    end

    def content_type
      "text/html; charset=%s" % [@charset]
    end

    def add_feature(key : String)
      unless @features.has_key?(key)
        Guff::PageFeatures.add(key, self)
        @features[key] = true
      end
    end

    def add_features(features : Array(String))
      features.each { |key| add_feature(key) }
    end

    ECR.def_to_s("./src/guff/views/ecrs/page.ecr")
  end
end