#-- encoding: UTF-8
#-- copyright
# OpenProject is a project management system.
# Copyright (C) 2012-2015 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 Principal < ActiveRecord::Base
  extend Pagination::Model

  self.table_name = "#{table_name_prefix}users#{table_name_suffix}"

  has_many :members, foreign_key: 'user_id', dependent: :destroy
  has_many :memberships, class_name: 'Member', foreign_key: 'user_id', include: [:project, :roles], conditions: "#{Project.table_name}.status=#{Project::STATUS_ACTIVE}", order: "#{Project.table_name}.name"
  has_many :projects, through: :memberships
  has_many :categories, foreign_key: 'assigned_to_id', dependent: :nullify

  # TODO: The constants are misplaced in the subclass
  scope :active, -> { where(status: User::STATUSES[:active]) }

  scope :active_or_registered, -> { where(status: [User::STATUSES[:active], User::STATUSES[:registered]]) }

  scope :active_or_registered_like, ->(query) { active_or_registered.like(query) }

  scope :not_in_project, lambda { |project| { conditions: "id NOT IN (select m.user_id FROM members as m where m.project_id = #{project.id})" } }

  scope :like, lambda { |q|
    firstnamelastname = "((firstname || ' ') || lastname)"
    lastnamefirstname = "((lastname || ' ') || firstname)"

    # special concat for mysql
    if ChiliProject::Database.mysql?
      firstnamelastname = "CONCAT(CONCAT(firstname, ' '), lastname)"
      lastnamefirstname = "CONCAT(CONCAT(lastname, ' '), firstname)"
    end

    s = "%#{q.to_s.downcase.strip.tr(',', '')}%"

    {
      conditions: ['LOWER(login) LIKE :s OR ' +
        "LOWER(#{firstnamelastname}) LIKE :s OR " +
        "LOWER(#{lastnamefirstname}) LIKE :s OR " +
        'LOWER(mail) LIKE :s',
                   { s: s }],
      order: 'type, login, lastname, firstname, mail'
    }
  }

  scope :visible_by, lambda { |principal| Principal.visible_by_condition(principal) }

  before_create :set_default_empty_values

  def name(_formatter = nil)
    to_s
  end

  def self.possible_members(criteria, limit)
    Principal.active_or_registered_like(criteria).limit(limit)
  end

  def self.search_scope_without_project(project, query)
    active_or_registered_like(query).not_in_project(project)
  end

  def self.visible_by_condition(principal)
    if principal.respond_to?(:admin?) && principal.admin?
      return where('true')
    end

    project_ids = principal.projects.pluck(:id)
    where('id IN (select m.user_id FROM members AS m WHERE (m.project_id IN (?)))',
          project_ids)
  end

  def status_name
    # Only Users should have another status than active.
    # User defines the status values and other classes like Principal
    # shouldn't know anything about them. Nevertheless, some functions
    # want to know the status for other Principals than User.
    raise 'Principal has status other than active' unless status == 1
    'active'
  end

  ##
  # Allows the API and other sources to determine locking actions
  # on represented collections of children of Principals.
  # Must be overriden by User
  def lockable?
    false
  end

  ##
  # Allows the API and other sources to determine unlocking actions
  # on represented collections of children of Principals.
  # Must be overriden by User
  def activatable?
    false
  end

  def <=>(principal)
    if self.class.name == principal.class.name
      to_s.downcase <=> principal.to_s.downcase
    else
      # groups after users
      principal.class.name <=> self.class.name
    end
  end

  protected

  # Make sure we don't try to insert NULL values (see #4632)
  def set_default_empty_values
    self.login ||= ''
    self.firstname ||= ''
    self.lastname ||= ''
    self.mail ||= ''
    true
  end
end