require 'carrierwave/orm/activerecord'

class Group < Namespace
  include Gitlab::ConfigHelper
  include Gitlab::VisibilityLevel
  include Referable

  has_many :group_members, dependent: :destroy, as: :source, class_name: 'GroupMember'
  alias_method :members, :group_members
  has_many :users, through: :group_members
  has_many :project_group_links, dependent: :destroy
  has_many :shared_projects, through: :project_group_links, source: :project
  has_many :notification_settings, dependent: :destroy, as: :source

  validate :avatar_type, if: ->(user) { user.avatar.present? && user.avatar_changed? }
  validate :visibility_level_allowed_by_projects

  validates :avatar, file_size: { maximum: 200.kilobytes.to_i }

  mount_uploader :avatar, AvatarUploader

  after_create :post_create_hook
  after_destroy :post_destroy_hook

  class << self
    # Searches for groups matching the given query.
    #
    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
    #
    # query - The search query as a String
    #
    # Returns an ActiveRecord::Relation.
    def search(query)
      table   = Namespace.arel_table
      pattern = "%#{query}%"

      where(table[:name].matches(pattern).or(table[:path].matches(pattern)))
    end

    def sort(method)
      order_by(method)
    end

    def reference_prefix
      User.reference_prefix
    end

    def reference_pattern
      User.reference_pattern
    end

    def visible_to_user(user)
      where(id: user.authorized_groups.select(:id).reorder(nil))
    end
  end

  def to_reference(_from_project = nil)
    "#{self.class.reference_prefix}#{name}"
  end

  def human_name
    name
  end

  def visibility_level_field
    visibility_level
  end

  def visibility_level_allowed_by_projects
    allowed_by_projects = self.projects.where('visibility_level > ?', self.visibility_level).none?

    unless allowed_by_projects
      level_name = Gitlab::VisibilityLevel.level_name(visibility_level).downcase
      self.errors.add(:visibility_level, "#{level_name} is not allowed since there are projects with higher visibility.")
    end

    allowed_by_projects
  end

  def avatar_url(size = nil)
    if avatar.present?
      [gitlab_config.url, avatar.url].join
    end
  end

  def owners
    @owners ||= group_members.owners.includes(:user).map(&:user)
  end

  def add_users(user_ids, access_level, current_user = nil)
    user_ids.each do |user_id|
      Member.add_user(self.group_members, user_id, access_level, current_user)
    end
  end

  def add_user(user, access_level, current_user = nil)
    add_users([user], access_level, current_user)
  end

  def add_guest(user, current_user = nil)
    add_user(user, Gitlab::Access::GUEST, current_user)
  end

  def add_reporter(user, current_user = nil)
    add_user(user, Gitlab::Access::REPORTER, current_user)
  end

  def add_developer(user, current_user = nil)
    add_user(user, Gitlab::Access::DEVELOPER, current_user)
  end

  def add_master(user, current_user = nil)
    add_user(user, Gitlab::Access::MASTER, current_user)
  end

  def add_owner(user, current_user = nil)
    add_user(user, Gitlab::Access::OWNER, current_user)
  end

  def has_owner?(user)
    owners.include?(user)
  end

  def has_master?(user)
    members.masters.where(user_id: user).any?
  end

  def last_owner?(user)
    has_owner?(user) && owners.size == 1
  end

  def avatar_type
    unless self.avatar.image?
      self.errors.add :avatar, "only images allowed"
    end
  end

  def post_create_hook
    Gitlab::AppLogger.info("Group \"#{name}\" was created")

    system_hook_service.execute_hooks_for(self, :create)
  end

  def post_destroy_hook
    Gitlab::AppLogger.info("Group \"#{name}\" was removed")

    system_hook_service.execute_hooks_for(self, :destroy)
  end

  def system_hook_service
    SystemHooksService.new
  end
end