module Formtastic
  module Actions
  # Outputs a link wrapped in the standard `<li>` wrapper. This the default for `:cancel` actions.
  # The link's URL defaults to Rails' built-in `:back` macro (the HTTP referrer, or Javascript for the
  # browser's history), but can be altered with the `:url` option.
  #
  # @example The `:as` can be ommitted, these are functionally equivalent
  #   <%= f.action :cancel, :as => :link %>
  #   <%= f.action :cancel %>
  #
  # @example Full form context and output
  #
  #   <%= semantic_form_for(@post) do |f| %>
  #     <%= f.actions do %>
  #       <%= f.action :submit, :as => :input %>
  #       <%= f.action :cancel, :as => :link %>
  #     <% end %>
  #   <% end %>
  #
  #   <form...>
  #     <fieldset class="actions">
  #       <ol>
  #         <li class="action input_action" id="post_submit_action">
  #           <input type="submit" value="Create Post">
  #         </li>
  #         <li class="action link_action" id="post_cancel_action">
  #           <a href="javascript:history.back()">Cancel</a>
  #         </li>
  #       </ol>
  #     </fieldset>
  #   </form>
  #
  # @example Modifying the URL for the link
  #   <%= f.action :cancel, :as => :link, :url => "http://example.com/path" %>
  #   <%= f.action :cancel, :as => :link, :url => "/path" %>
  #   <%= f.action :cancel, :as => :link, :url => posts_path %>
  #   <%= f.action :cancel, :as => :link, :url => url_for(...) %>
  #   <%= f.action :cancel, :as => :link, :url => { :controller => "posts", :action => "index" } %>
  #
  # @example Specifying a label with a String
  #   <%= f.action :cancel, :as => :link, :label => "Stop" %>
  #
  # @example Pass HTML attributes down to the `<a>`
  #   <%= f.action :cancel, :as => :link, :button_html => { :class => 'pretty', :accesskey => 'x' } %>
  #
  # @example Access key can also be set as a top-level option
  #   <%= f.action :cancel, :as => :link, :accesskey => 'x' %>
  #
  # @example Pass HTML attributes down to the `<li>` wrapper (classes are appended to the existing classes)
  #   <%= f.action :cancel, :as => :link, :wrapper_html => { :class => 'special', :id => 'whatever' } %>
  #   <%= f.action :cancel, :as => :link, :wrapper_html => { :class => ['extra', 'special'], :id => 'whatever' } %>
  #
  # @todo document i18n keys
  # @todo document i18n translation with :label (?)
  # @todo :prefix and :suffix options? (can also be done with CSS or subclassing for custom Actions)
  class LinkAction
      include Base

      # @see Formtastic::Helpers::ActionHelper#action
      # @option *args :label [String, Symbol]
      #   Override the label text with a String or a symbol for an i18n translation key
      #
      # @option *args :button_html [Hash]
      #   Override or add to the HTML attributes to be passed down to the `<a>` tag
      #
      # @option *args :wrapper_html [Hash]
      #   Override or add to the HTML attributes to be passed down to the wrapping `<li>` tag
      #

      def supported_methods
        [:cancel]
      end

      # TODO reset_action class?
      def to_html
        wrapper do
          template.link_to(text, url, button_html)
        end
      end

      def url
        return options[:url] if options.key?(:url)
        :back
      end

    end
  end
end