#-- encoding: UTF-8
#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2013 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# 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.
#
# See doc/COPYRIGHT.rdoc for more details.
#++

module WatchersHelper
  # Create a link to watch/unwatch object
  #
  # * :replace - a string or array of strings with css selectors that will be updated, whenever the watcher status is changed
  def watcher_link(object, user, options = { replace: '.watcher_link', class: 'watcher_link' })
    options = options.with_indifferent_access
    raise ArgumentError, 'Missing :replace option in options hash' if options['replace'].blank?

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

    watched = object.watched_by?(user)

    html_options = options
    path = send(:"#{(watched ? 'unwatch' : 'watch')}_path", object_type: object.class.to_s.underscore.pluralize,
                                                            object_id: object.id,
                                                            replace: options.delete('replace'))
    html_options[:class] = html_options[:class].to_s + (watched ? ' icon icon-watched' : ' icon icon-unwatched')

    method = watched ?
      :delete :
      :post

    label = watched ?
      l(:button_unwatch) :
      l(:button_watch)

    content_tag :div, class: 'button' do
      link_to(label, path, html_options.merge(remote: true, method: method))
    end
  end

  # Returns HTML for a 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.sort.map { |user|
      watcher = object.watchers(true).find { |u| u.user_id == user.id }
      content_tag :li do
        avatar(user, class: 'avatar-mini') +
        link_to_user(user, class: 'user') +
        if remove_allowed
          ' '.html_safe + link_to(icon_wrapper('icon-context icon-close delete-ctrl',
                                               l(:button_delete_watcher, name: user.name)),
                                  watcher_path(watcher),
                                  method: :delete,
                                  remote: true,
                                  title: l(:button_delete_watcher, name: user.name),
                                  class: 'delete no-decoration-on-hover')
        else
          ''.html_safe
        end
      end
    }
    lis.empty? ? ''.html_safe : content_tag(:ul, lis.reduce(:+))
  end
end