module ApplicationHelper

  def home_page?
    return false if user_signed_in?
    # Using path because fullpath yields false negatives since it contains
    # parameters too
    request.path == '/'
  end

  def opendata_page?
    request.path == '/opendata'
  end

  def header_css
    home_page? || opendata_page? ? '' : 'results'
  end

  # if current path is /debates current_path_with_query_params(foo: 'bar') returns /debates?foo=bar
  # notice: if query_params have a param which also exist in current path, it "overrides" (query_params is merged last)
  def current_path_with_query_params(query_parameters)
    url_for(request.query_parameters.merge(query_parameters))
  end

  def markdown(text)
    render_options = {
      # will remove from the output HTML tags inputted by user
      filter_html:     false,
      # will insert <br /> tags in paragraphs where are newlines
      # (ignored by default)
      hard_wrap:       true,
      # hash for extra link options, for example 'nofollow'
      link_attributes: { }
      # more
      # will remove <img> tags from output
      # no_images: true
      # will remove <a> tags from output
      # no_links: true
      # will remove <style> tags from output
      # no_styles: true
      # generate links for only safe protocols
      # safe_links_only: true
      # and more ... (prettify, with_toc_data, xhtml)
    }
    renderer = Redcarpet::Render::HTML.new(render_options)

    extensions = {
      #will parse links without need of enclosing them
      autolink:           true,
      # blocks delimited with 3 ` or ~ will be considered as code block.
      # No need to indent.  You can provide language name too.
      # ```ruby
      # block of code
      # ```
      fenced_code_blocks: true,
      # will ignore standard require for empty lines surrounding HTML blocks
      lax_spacing:        true,
      # will not generate emphasis inside of words, for example no_emph_no
      no_intra_emphasis:  true,
      # will parse strikethrough from ~~, for example: ~~bad~~
      strikethrough:      true,
      # will parse superscript after ^, you can wrap superscript in ()
      superscript:        true
      # will require a space after # in defining headers
      # space_after_headers: true
    }
    Redcarpet::Markdown.new(renderer, extensions).render(text).html_safe
  end
end