#-- encoding: UTF-8

#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2017 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) 2006-2017 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 ErrorsHelper
  def render_400(options = {})
    @project = nil
    render_error({ message: :notice_bad_request, status: 400 }.merge(options))
    false
  end

  def render_403(options = {})
    @project = nil
    render_error({ message: :notice_not_authorized, status: 403 }.merge(options))
    false
  end

  def render_404(options = {})
    render_error({ message: :notice_file_not_found, status: 404 }.merge(options))
    false
  end

  def render_500(options = {})
    message = t(:notice_internal_server_error, app_title: Setting.app_title)

    unset_template_magic

    # Append error information
    if current_user.admin?
      options[:message_details] = get_additional_message
    end

    render_error({ message: message }.merge(options))
    false
  end

  def get_additional_message
    return unless OpenProject::Configuration.migration_check_on_exceptions?

    if OpenProject::Database.migrations_pending?(ensure_fresh: true)
      I18n.t(:error_migrations_are_pending)
    end
  end

  def render_optional_error_file(status_code)
    user_setup unless User.current.id == session[:user_id]

    case status_code
    when :not_found
      render_404
    when :internal_server_error
      render_500
    else
      super
    end
  end

  # Renders an error response
  def render_error(arg)
    arg = { message: arg } unless arg.is_a?(Hash)

    @status = arg[:status] || 500
    @message = arg[:message]

    if @status >= 500
      op_handle_error arg[:exception] || "[Error #@status] #@message"
    end

    @message = l(@message) if @message.is_a?(Symbol)
    @message_details = arg[:message_details]
    respond_to do |format|
      format.html do
        render template: 'common/error', layout: use_layout, status: @status
      end
      format.any do
        head @status
      end
    end
  end

  def unset_template_magic
    if $ERROR_INFO.is_a?(ActionView::ActionViewError)
      @template.instance_variable_set('@project', nil)
      @template.instance_variable_set('@status', 500)
      @template.instance_variable_set('@message', message)
    else
      @project = nil
    end
  rescue StandardError
    # bad luck
  end
end