# frozen_string_literal: true

module PaperTrail
  module Queries
    module Versions
      # For public API documentation, see `where_object_changes_to` in
      # `paper_trail/version_concern.rb`.
      # @api private
      class WhereObjectChangesTo
        # - version_model_class - The class that VersionConcern was mixed into.
        # - attributes - A `Hash` of attributes and values. See the public API
        #   documentation for details.
        # @api private
        def initialize(version_model_class, attributes)
          @version_model_class = version_model_class
          @attributes = attributes
        end

        # @api private
        def execute
          if PaperTrail.config.object_changes_adapter.respond_to?(:where_object_changes_to)
            return PaperTrail.config.object_changes_adapter.where_object_changes_to(
              @version_model_class, @attributes
            )
          end
          column_type = @version_model_class.columns_hash["object_changes"].type
          case column_type
          when :jsonb, :json
            json
          else
            raise UnsupportedColumnType.new(
              method: "where_object_changes_to",
              expected: "json or jsonb",
              actual: column_type
            )
          end
        end

        private

        # @api private
        def json
          predicates = []
          values = []
          @attributes.each do |field, value|
            predicates.push(
              "(object_changes->>? ILIKE ?)"
            )
            values.concat([field, "[%#{value.to_json}]"])
          end
          sql = predicates.join(" and ")
          @version_model_class.where(sql, *values)
        end
      end
    end
  end
end