#-- 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.
#++

##
# Implements the deletion of a user.
class DeleteUserService
  attr_reader :user, :actor

  def initialize(user, actor)
    @user = user
    @actor = actor
  end
  ##
  # Deletes the given user if allowed.
  #
  # @return True if the user deletion has been initiated, false otherwise.
  def call
    if deletion_allowed?
      # as destroying users is a lengthy process we handle it in the background
      # and lock the account now so that no action can be performed with it
      user.lock!
      Delayed::Job.enqueue DeleteUserJob.new(user.id)

      logout! if self_delete?

      true
    else
      false
    end
  end

  ##
  # Checks if a given user may be deleted by another one.
  #
  # @param user [User] User to be deleted.
  # @param actor [User] User who wants to delete the given user.
  def self.deletion_allowed?(user, actor)
    if actor == user
      Setting.users_deletable_by_self?
    else
      actor.admin && Setting.users_deletable_by_admins?
    end
  end

  private

  def deletion_allowed?
    self.class.deletion_allowed? user, actor
  end

  def self_delete?
    user == actor
  end

  def logout!
    User.current = nil
  end
end