# frozen_string_literal: true

# This class only partly represents MODELS_ALLOWLIST records from DB and
# is used to connect ReleasesAttachmentsImporter, NotesAttachmentsImporter etc.
# with NoteAttachmentsImporter without modifying ObjectImporter a lot.
# Attachments are inside release's `description`.
module Gitlab
  module GithubImport
    module Representation
      class NoteText
        include ToHash
        include ExposeAttribute

        MODELS_ALLOWLIST = [::Release, ::Note, ::Issue, ::MergeRequest].freeze
        ModelNotSupported = Class.new(StandardError)

        attr_reader :attributes

        expose_attribute :record_db_id, :record_type, :text, :iid, :tag, :noteable_type

        # Builds a note text representation from DB record of Note or Release.
        #
        # record - An instance of `Note`, `Release`, `Issue`, `MergeRequest` model
        def self.from_db_record(record)
          check_record_class!(record)

          record_type = record.class.name
          # only column for note is different along MODELS_ALLOWLIST
          text = record.is_a?(::Note) ? record.note : record.description
          new(
            record_db_id: record.id,
            record_type: record_type,
            text: text,
            iid: record.try(:iid),
            tag: record.try(:tag),
            noteable_type: record.try(:noteable_type)
          )
        end

        def self.from_json_hash(raw_hash)
          new Representation.symbolize_hash(raw_hash)
        end

        def self.check_record_class!(record)
          raise ModelNotSupported, record.class.name if MODELS_ALLOWLIST.exclude?(record.class)
        end
        private_class_method :check_record_class!

        # attributes - A Hash containing the event details. The keys of this
        #              Hash (and any nested hashes) must be symbols.
        def initialize(attributes)
          @attributes = attributes
        end

        def github_identifiers
          {
            db_id: record_db_id
          }.merge(record_type_specific_attribute)
        end

        private

        def record_type_specific_attribute
          case record_type
          when ::Release.name
            { tag: tag }
          when ::Issue.name, ::MergeRequest.name
            { noteable_iid: iid }
          when ::Note.name
            { noteable_type: noteable_type }
          end
        end
      end
    end
  end
end