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# Redmine - project management software

# Copyright (C) 2006-2011  Jean-Philippe Lang

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

module WatchersHelper

  def watcher_tag(object, user, options={})

    content_tag("span", watcher_link(object, user), :class => watcher_css(object))

  end

  def watcher_link(object, user)

    return '' unless user && user.logged? && object.respond_to?('watched_by?')

    watched = object.watched_by?(user)

    url = {:controller => 'watchers',

           :action => (watched ? 'unwatch' : 'watch'),

           :object_type => object.class.to_s.underscore,

           :object_id => object.id}

    link_to_remote((watched ? l(:button_unwatch) : l(:button_watch)),

                   {:url => url},

                   :href => url_for(url),

                   :class => (watched ? 'icon icon-fav' : 'icon icon-fav-off'))

  end

  # Returns the css class used to identify watch links for a given +object+

  def watcher_css(object)

    "#{object.class.to_s.underscore}-#{object.id}-watcher"

  end

  # Returns a comma separated list of users watching the given object

  def watchers_list(object)

    remove_allowed = User.current.allowed_to?("delete_#{object.class.name.underscore}_watchers".to_sym, object.project)

    lis = object.watcher_users.collect do |user|

      s = avatar(user, :size => "16").to_s + link_to_user(user, :class => 'user').to_s

      if remove_allowed

        url = {:controller => 'watchers',

               :action => 'destroy',

               :object_type => object.class.to_s.underscore,

               :object_id => object.id,

               :user_id => user}

        s += ' ' + link_to_remote(image_tag('delete.png'),

                                  {:url => url},

                                  :href => url_for(url),

                                  :style => "vertical-align: middle",

                                  :class => "delete")

      end

      "<li>#{ s }</li>"

    end

    lis.empty? ? "" : "<ul>#{ lis.join("\n") }</ul>"

  end

end