#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2021 the OpenProject GmbH
#
# 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 COPYRIGHT and LICENSE files for more details.
#++

module ActionView
  module Helpers
    module Tags
      Base.class_eval do
        attr_reader :method_name
      end
    end

    module AccessibleErrors
      def self.included(base)
        base.send(:include, InstanceMethods)
        base.extend(ClassMethods)
      end

      module ClassMethods
        def wrap_with_error_span(html_tag, object, method)
          object_identifier = erroneous_object_identifier(object.object_id.to_s, method)

          "<span id='#{object_identifier}' class=\"errorSpan\"><a name=\"#{object_identifier}\"></a>#{html_tag}</span>".html_safe
        end

        def erroneous_object_identifier(id, method)
          # select boxes use name_id whereas the validation uses name
          # we have to cut the '_id' of in order for the field to match
          id + '_' + method.gsub('_id', '') + '_error'
        end
      end

      module InstanceMethods
        def error_message_list(objects)
          objects.map do |object|
            error_messages = []

            object.errors.each_error do |attr, error|
              unless attr == 'custom_values'
                # Generating unique identifier in order to jump directly to the field with the error
                object_identifier = erroneous_object_identifier(object.object_id.to_s, attr)

                error_messages << [object.class.human_attribute_name(attr) + ' ' + error.message, object_identifier]
              end
            end

            # excluding custom_values from the errors.each loop before
            # as more than one error can be assigned to custom_values
            # which would add to many error messages
            if object.errors[:custom_values].any?
              object.custom_values.each do |value|
                value.errors.map do |attr, msg|
                  # Generating unique identifier in order to jump directly to the field with the error
                  object_identifier = erroneous_object_identifier(value.object_id.to_s, attr)
                  error_messages << [value.custom_field.name + ' ' + msg, object_identifier]
                end
              end
            end

            error_message_list_elements(error_messages)
          end
        end

        private

        def erroneous_object_identifier(id, method)
          self.class.erroneous_object_identifier(id, method)
        end

        def error_message_list_elements(array)
          array.map do |msg, identifier|
            content_tag :li do
              content_tag :a,
                          ERB::Util.html_escape(msg),
                          href: '#' + identifier,
                          class: 'afocus'
            end
          end
        end
      end
    end

    module DateHelper
      # distance_of_time_in_words breaks when difference is greater than 30 years
      def distance_of_date_in_words(from_date, to_date = 0, options = {})
        from_date = from_date.to_date if from_date.respond_to?(:to_date)
        to_date = to_date.to_date if to_date.respond_to?(:to_date)
        distance_in_days = (to_date - from_date).abs

        I18n.with_options locale: options[:locale], scope: :'datetime.distance_in_words' do |locale|
          case distance_in_days
          when 0..60     then locale.t :x_days,             count: distance_in_days.round
          when 61..720   then locale.t :about_x_months,     count: (distance_in_days / 30).round
          else                locale.t :over_x_years,       count: (distance_in_days / 365).floor
          end
        end
      end
    end
  end
end

ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
  if html_tag.include?('<label')
    html_tag.to_s
  else
    ActionView::Base.wrap_with_error_span(html_tag, instance.object, instance.method_name)
  end
end

ActionView::Base.include ActionView::Helpers::AccessibleErrors