module Github
  module Representation
    class Branch < Representation::Base
      attr_reader :repository

      def user
        raw.dig('user', 'login') || 'unknown'
      end

      def repo
        return @repo if defined?(@repo)

        @repo = Github::Representation::Repo.new(raw['repo']) if raw['repo'].present?
      end

      def ref
        raw['ref']
      end

      def sha
        raw['sha']
      end

      def short_sha
        Commit.truncate_sha(sha)
      end

      def exists?
        branch_exists? && commit_exists?
      end

      def valid?
        sha.present? && ref.present?
      end

      private

      def branch_exists?
        repository.branch_exists?(ref)
      end

      def commit_exists?
        repository.branch_names_contains(sha).include?(ref)
      end

      def repository
        @repository ||= options.fetch(:repository)
      end
    end
  end
end