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// Copyright 2023 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.common.values;

import com.google.auto.value.AutoValue;
import com.google.common.primitives.UnsignedLong;
import com.google.errorprone.annotations.Immutable;
import dev.cel.common.types.CelType;
import dev.cel.common.types.SimpleType;

/**
 * UintValue represents CelValue for unsigned longs. This either leverages Guava's implementation of
 * {@link UnsignedLong}, or just holds a primitive long.
 */
@Immutable
@AutoValue
@AutoValue.CopyAnnotations
@SuppressWarnings("Immutable") // value is either a boxed long or an immutable UnsignedLong.
public abstract class UintValue extends CelValue {

  @Override
  public abstract Number value();

  @Override
  public boolean isZeroValue() {
    return value().longValue() == 0;
  }

  @Override
  public CelType celType() {
    return SimpleType.UINT;
  }

  public static UintValue create(UnsignedLong value) {
    return new AutoValue_UintValue(value);
  }

  public static UintValue create(long value, boolean enableUnsignedLongs) {
    Number unsignedLong = enableUnsignedLongs ? UnsignedLong.fromLongBits(value) : value;
    return new AutoValue_UintValue(unsignedLong);
  }
}