# frozen_string_literal: true

module Resolvers
  module DesignManagement
    module Version
      # Resolver for DesignAtVersion objects given an implicit version context
      class DesignsAtVersionResolver < BaseResolver
        include Gitlab::Graphql::Authorize::AuthorizeResource

        type Types::DesignManagement::DesignAtVersionType, null: true

        authorize :read_design

        DesignID = ::Types::GlobalIDType[::DesignManagement::Design]

        argument :ids, [DesignID],
                 required: false,
                 description: 'Filters designs by their ID.'
        argument :filenames,
                 [GraphQL::Types::String],
                 required: false,
                 description: 'Filters designs by their filename.'

        def self.single
          ::Resolvers::DesignManagement::Version::DesignAtVersionResolver
        end

        def resolve(ids: nil, filenames: nil)
          find(ids, filenames).execute.map { |d| make(d) }
        end

        private

        def find(ids, filenames)
          ::DesignManagement::DesignsFinder.new(issue, current_user,
                                                ids: design_ids(ids),
                                                filenames: filenames,
                                                visible_at_version: version)
        end

        def design_ids(gids)
          return if gids.nil?

          # TODO: remove this line when the compatibility layer is removed
          # See: https://gitlab.com/gitlab-org/gitlab/-/issues/257883
          gids = gids.map { |id| DesignID.coerce_isolated_input(id) }
          gids.map(&:model_id)
        end

        def issue
          version.issue
        end

        def version
          object
        end

        def make(design)
          ::DesignManagement::DesignAtVersion.new(design: design, version: version)
        end
      end
    end
  end
end