module ApplicationHelper
  def bootstrap_class_for flash_type
    { success: "alert-success", error: "alert-danger", alert: "alert-warning", notice: "alert-info" }[flash_type.to_sym] || flash_type.to_s
  end

  def flash_messages(opts = {})
    capture do
      flash.each do |msg_type, message|
        concat(content_tag(:div, message, class: "alert #{bootstrap_class_for(msg_type)} alert-dismissible", role: 'alert') do
          concat(content_tag(:button, class: 'close', data: { dismiss: 'alert' }) do
            concat content_tag(:span, '×'.html_safe, 'aria-hidden' => true)
            concat content_tag(:span, 'Close', class: 'sr-only')
          end)
          concat message
        end)
      end
      nil
    end
  end

  # Returns the full title on a per-page basis.
  def full_title(page_title = '')
    base_title = t('application.site_title')
    if page_title.empty?
      base_title
    else
      page_title + ' - ' + base_title
    end
  end

  def nav_link_to(body, url)
    nav_options = { class: current_page?(url) ? 'nav-item active': 'nav-item' }
    content_tag(:li, nav_options) do
      link_to body, url, class: 'nav-link'
    end
  end

end