#!/usr/bin/env ruby
# frozen_string_literal: true

require 'treetop'
require_relative 'node'

# A tag
class TagStatement < Node
  # http://w3c.github.io/html/syntax.html#void-elements
  VOID_TAGS = (
    "area base br col embed hr img input link " +
    "menuitem meta param source track wbr"
  ).split(/\s+/)

  def to_html(context)
    if void_tag?
      opening_tag(context)
    else
      opening_tag(context) +
        (
          if !body.empty?
            body.to_html(context)
          else
            ''
          end
        ) +
        closing_tag(context)
    end
  end

  def class_attribute
    unless classes.empty?
      class_names = classes
        .elements
        .map{ |c| c.name.text_value }
        .join(' ')

      " class=\"#{class_names}\""
    else
      ''
    end
  end

  def id_attribute
    unless identifier.empty?
      " id=\"#{identifier.name.text_value}\""
    else
      ''
    end
  end

  def opening_tag(context)
    "<#{tag.text_value}" +
      id_attribute +
      class_attribute +
      (
        if !attributes.empty?
          ' ' + attributes.to_html(context)
        else
          ''
        end
      ) + (
        if void_tag?
          ' />'
        else
          '>'
        end
      )
  end

  def void_tag?
    VOID_TAGS.include? tag.text_value
  end

  def closing_tag(_context)
    "</#{tag.text_value}>"
  end
end