# == Schema Information
#
# Table name: namespaces
#

#  id          :integer          not null, primary key
#  name        :string(255)      not null
#  path        :string(255)      not null

#  owner_id    :integer

#  created_at  :datetime
#  updated_at  :datetime

#  type        :string(255)

#  description :string(255)      default(""), not null

#  avatar      :string(255)

#  public      :boolean          default(FALSE)

#

class Namespace < ActiveRecord::Base

  include Sortable

  include Gitlab::ShellAdapter

  has_many :projects, dependent: :destroy

  belongs_to :owner, class_name: "User"

  validates :owner, presence: true, unless: ->(n) { n.type == "Group" }

  validates :name,
    presence: true, uniqueness: true,
    length: { within: 0..255 },

    format: { with: Gitlab::Regex.namespace_name_regex,
              message: Gitlab::Regex.namespace_name_regex_message }

  validates :description, length: { within: 0..255 }

  validates :path,
    length: { within: 1..255 },

    namespace: true,
    presence: true,
    uniqueness: { case_sensitive: false }

  delegate :name, to: :owner, allow_nil: true, prefix: true

  after_create :ensure_dir_exist

  after_update :move_dir, if: :path_changed?

  after_destroy :rm_dir

  scope :root, -> { where('type IS NULL') }

  class << self
    def by_path(path)
      where('lower(path) = :value', value: path.downcase).first
    end

    # Case insensetive search for namespace by path or name
    def find_by_path_or_name(path)
      find_by("lower(path) = :path OR lower(name) = :path", path: path.downcase)
    end

    def search(query)
      where("name LIKE :query OR path LIKE :query", query: "%#{query}%")
    end

    def clean_path(path)

      path = path.dup

      # Get the email username by removing everything after an `@` sign.

      path.gsub!(/@.*\z/,             "")

      # Usernames can't end in .git, so remove it.

      path.gsub!(/\.git\z/,           "")

      # Remove dashes at the start of the username.

      path.gsub!(/\A-+/,              "")

      # Remove periods at the end of the username.

      path.gsub!(/\.+\z/,             "")

      # Remove everything that's not in the list of allowed characters.

      path.gsub!(/[^a-zA-Z0-9_\-\.]/, "")

      # Users with the great usernames of "." or ".." would end up with a blank username.

      # Work around that by setting their username to "blank", followed by a counter.

      path = "blank" if path.blank?

      counter = 0
      base = path

      while Namespace.find_by_path_or_name(path)

        counter += 1
        path = "#{base}#{counter}"
      end

      path
    end

  end

  def to_param

    path

  end

  def human_name
    owner_name
  end

  def ensure_dir_exist

    gitlab_shell.add_namespace(path)

  end

  def rm_dir

    # Move namespace directory into trash.
    # We will remove it later async
    new_path = "#{path}+#{id}+deleted"

    if gitlab_shell.mv_namespace(path, new_path)
      message = "Namespace directory \"#{path}\" moved to \"#{new_path}\""
      Gitlab::AppLogger.info message

      # Remove namespace directroy async with delay so
      # GitLab has time to remove all projects first
      GitlabShellWorker.perform_in(5.minutes, :rm_namespace, new_path)
    end

  end

  def move_dir

    # Ensure old directory exists before moving it
    gitlab_shell.add_namespace(path_was)

    if gitlab_shell.mv_namespace(path_was, path)

      Gitlab::UploadsTransfer.new.rename_namespace(path_was, path)

      # If repositories moved successfully we need to
      # send update instructions to users.

      # However we cannot allow rollback since we moved namespace dir
      # So we basically we mute exceptions in next actions

      begin

        send_update_instructions

      rescue

        # Returning false does not rollback after_* transaction but gives

        # us information about failing some of tasks
        false

      end

    else
      # if we cannot move namespace directory we should rollback
      # db changes in order to prevent out of sync between db and fs
      raise Exception.new('namespace directory cannot be moved')

    end

  end

  def send_update_instructions

    projects.each do |project|
      project.send_move_instructions("#{path_was}/#{project.path}")
    end

  end

  def kind
    type == 'Group' ? 'group' : 'user'
  end

  def find_fork_of(project)
    projects.joins(:forked_project_link).where('forked_project_links.forked_from_project_id = ?', project.id).first
  end

end