#-- 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.
#++

require_dependency 'journal_formatter/base'

class OpenProject::JournalFormatter::Diff < JournalFormatter::Base
  # unloadable

  def render(key, values, options = {})
    merge_options = { only_path: true,
                      no_html: false }.merge(options)

    render_ternary_detail_text(key, values.last, values.first, merge_options)
  end

  private

  def label(key, no_html = false)
    label = super key

    no_html ?
      label :
      content_tag('strong', label)
  end

  def render_ternary_detail_text(key, value, old_value, options)
    link = link(key, options)

    label = label(key, options[:no_html])

    if value.blank?
      l(:text_journal_deleted_with_diff, label: label, link: link)
    else
      unless old_value.blank?
        l(:text_journal_changed_with_diff, label: label, link: link)
      else
        l(:text_journal_set_with_diff, label: label, link: link)
      end
    end
  end

  # url_for wants to access the controller method, which we do not have in our Diff class.
  # see: http://stackoverflow.com/questions/3659455/is-there-a-new-syntax-for-url-for-in-rails-3
  def controller
    nil
  end

  def link(key, options)
    url_attr = default_attributes(options).merge(controller: '/journals',
                                                 action: 'diff',
                                                 id: @journal.id,
                                                 field: key.downcase)

    if options[:no_html]
      url_for url_attr
    else
      link_to(l(:label_details),
              url_attr,
              class: 'description-details')
    end
  end

  def default_attributes(options)
    if options[:only_path]
      { only_path: options[:only_path],
        # setting :script_name is a hack that allows for setting the sub uri.
        # I am not yet sure why url_for normally returns the sub uri but does not within
        # this class.
        script_name: ::OpenProject::Configuration.rails_relative_url_root }
    else
      { only_path: options[:only_path],
        protocol: Setting.protocol,
        host: Setting.host_name }
    end
  end
end