#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2014 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.
#++

class ClearIdentityUrlsOnUsers < ActiveRecord::Migration
  def up
    create_table "legacy_user_identity_urls" do |t|
      t.string   "login", :limit => 256, :default => "",    :null => false
      t.string   "identity_url"
    end

    execute "INSERT INTO legacy_user_identity_urls(id, login, identity_url)
             SELECT id, login, identity_url FROM users"

    execute "UPDATE users SET identity_url = NULL"
  end

  def down
    if mysql?

      execute "UPDATE users u
               JOIN legacy_user_identity_urls lu ON u.id = lu.id
               SET u.identity_url = lu.identity_url"

    elsif postgres?

      execute "UPDATE users
               SET identity_url = lu.identity_url
               FROM legacy_user_identity_urls lu
               WHERE users.id = lu.id"

    else
      raise "The down part of this migration only supports MySQL and PostgreSQL."
    end

    drop_table :legacy_user_identity_urls
  end

  def postgres?
    ActiveRecord::Base.connection.instance_values["config"][:adapter] == "postgresql"
  end

  def mysql?
    ActiveRecord::Base.connection.instance_values["config"][:adapter] == "mysql2"
  end
end