#-- 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.
#++

class RemoveDocuments < ActiveRecord::Migration[4.2]
  def up
    unless Redmine::Plugin.registered_plugins.include?(:openproject_documents)
      if  Document.any? || Attachment.where(container_type: ['Document']).any?
        raise 'Error: There are still documents and/or attachments attached to documents!'\
              "\n\n"\
              'You have the following options:'\
              "\n\n"\
              "(1) Install plug-in 'openproject-documents'\n"\
              '    This option prevents data loss and allows you to continue using documents.'\
              "\n\n"\
              "(2) Remove all documents from database\n"\
              "    Consider using the rake task 'migrations:documents:delete'."\
              "\n\n\n"
      else
        drop_table :documents
        DocumentCategory.destroy_all
        Attachment.where(container_type: ['Document']).destroy_all
      end
    end
  end

  def down
    unless ActiveRecord::Base.connection.table_exists? 'Documents'
      create_table 'documents', force: true do |t|
        t.integer 'project_id',                default: 0,  null: false
        t.integer 'category_id',               default: 0,  null: false
        t.string 'title',       limit: 60, default: '', null: false
        t.text 'description'
        t.datetime 'created_on'
      end
      add_index 'documents', ['category_id'], name: 'index_documents_on_category_id'
      add_index 'documents', ['created_on'], name: 'index_documents_on_created_on'
      add_index 'documents', ['project_id'], name: 'documents_project_id'
    end
  end
end

class Document < ActiveRecord::Base
  belongs_to :project
  belongs_to :category, class_name: 'DocumentCategory', foreign_key: 'category_id'
end

class DocumentCategory < Enumeration
  has_many :documents, foreign_key: 'category_id'
end