// Copyright 2025 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package dev.cel.runtime.planner;

import com.google.errorprone.annotations.Immutable;
import dev.cel.common.ast.CelExpr;
import dev.cel.runtime.GlobalResolver;

@Immutable
final class EvalAttribute extends InterpretableAttribute {

  private final Attribute attr;

  @Override
  Object evalInternal(GlobalResolver resolver, ExecutionFrame frame) {
    Object resolved = attr.resolve(expr().id(), resolver, frame);
    if (resolved instanceof MissingAttribute) {
      ((MissingAttribute) resolved).resolve(expr().id(), resolver, frame);
    }

    return resolved;
  }

  @Override
  public EvalAttribute addQualifier(CelExpr expr, Qualifier qualifier) {
    Attribute newAttribute = attr.addQualifier(qualifier);
    return create(expr, newAttribute);
  }

  static EvalAttribute create(CelExpr expr, Attribute attr) {
    return new EvalAttribute(expr, attr);
  }

  private EvalAttribute(CelExpr expr, Attribute attr) {
    super(expr);
    this.attr = attr;
  }
}
