module Gitolitable
  module Validations
    extend ActiveSupport::Concern

    included do
      # Set URL ourself as relative path.
      #
      before_validation :set_git_urls

      # Make sure that identifier does not match Gitolite Admin repository
      #
      validates_exclusion_of :identifier, in: %w(gitolite-admin)

      # Place additional constraints on repository identifiers
      # because of multi repos
      #
      validate :additional_constraints_on_identifier
      validate :identifier_dont_change
      validate :default_repository_has_identifier

      class << self

        # Build a hash of repository identifier :
        # <repo_1_identifier> => 1
        # <repo_2_identifier> => 1
        # etc...
        # If the same repository identifier is found many times, increment the corresponding counter.
        # Repository identifiers are unique if all values of the hash are 1.
        #
        def identifiers_to_hash
          self.all.map(&:identifier).inject(Hash.new(0)) do |h, x|
            h[x] += 1 unless x.blank?
            h
          end
        end


        def have_duplicated_identifier?
          (identifiers_to_hash.values.max || 0) > 1
        end

      end
    end


    def exists_in_gitolite?
      RedmineGitHosting::Commands.sudo_dir_exists?(gitolite_repository_path)
    end


    def empty_in_gitolite?
      RedmineGitHosting::Commands.sudo_repository_empty?(gitolite_repository_path)
    end


    def git_objects_count
      RedmineGitHosting::Commands.sudo_git_objects_count(File.join(gitolite_repository_path, 'objects'))
    end


    def empty?
      extra_info.nil? || (!extra_info.has_key?('heads') && !extra_info.has_key?('branches'))
    end


    def data_for_destruction
      {
        repo_name: gitolite_repository_name,
        repo_path: gitolite_full_repository_path,
        delete_repository: deletable?,
        git_cache_id: git_cache_id
      }
    end


    private


      # Set up git urls for new repositories
      #
      def set_git_urls
        self.url = gitolite_repository_path if self.url.blank?
        self.root_url = self.url if self.root_url.blank?
      end


      # Check several aspects of repository identifier (only for Redmine 1.4+)
      # 1) cannot equal identifier of any project
      # 2) if repo_ident_unique? make sure that repo identifier is globally unique
      # 3) cannot make this repo the default if there will be some other repo with blank identifier
      #
      def additional_constraints_on_identifier
        if !identifier.blank? && (new_record? || identifier_changed?)
          errors.add(:identifier, :cannot_equal_project) if Project.find_by_identifier(identifier)

          # See if a repo for another project has the same identifier (existing validations already check for current project)
          errors.add(:identifier, :taken) if self.class.repo_ident_unique? && Repository.where("identifier = ? and project_id <> ?", identifier, project.id).any?
        end
      end


      # Make sure identifier hasn't changed.  Allow null and blank
      # Note that simply using identifier_changed doesn't seem to work
      # if the identifier was "NULL" but the new identifier is ""
      #
      def identifier_dont_change
        return if new_record?
        errors.add(:identifier, :cannot_change) if (identifier_was.blank? && !identifier.blank?) || (!identifier_was.blank? && identifier_changed?)
      end


      # Need to make sure that we don't take the default slot away from a sibling repo with blank identifier
      #
      def default_repository_has_identifier
        if project && (is_default? || set_as_default?)
          possibles = Repository.where("project_id = ? and (identifier = '' or identifier is null)", project.id)
          errors.add(:base, :blank_default_exists) if possibles.any? && (new_record? || possibles.detect { |x| x.id != id })
        end
      end

  end
end