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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 *   http://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 org.apache.iceberg.transforms;

import java.util.Objects;
import org.apache.iceberg.expressions.BoundPredicate;
import org.apache.iceberg.expressions.UnboundPredicate;
import org.apache.iceberg.types.Type;
import org.apache.iceberg.types.Types;

public class UnknownTransform implements Transform {

  private final Type sourceType;
  private final String transform;

  UnknownTransform(Type sourceType, String transform) {
    this.sourceType
        = sourceType;
    this.transform = transform;
  }

  @Override
  public T apply(S value) {
    throw new UnsupportedOperationException(String.format("Cannot apply unsupported transform: %s", transform));
  }

  @Override
  public boolean canTransform(Type type) {
    // assume the transform function can be applied for this type because unknown transform is only used when parsing
    // a transform in an existing table. a different Iceberg version must have already validated it.
    return this.sourceType.equals(type);
  }

  @Override
  public Type getResultType(Type type) {
    // the actual result type is not known
    return Types.StringType.get();
  }

  @Override
  public UnboundPredicate project(String name, BoundPredicate predicate) {
    return null;
  }

  @Override
  public UnboundPredicate projectStrict(String name, BoundPredicate predicate) {
    return null;
  }

  @Override
  public String toString() {
    return transform;
  }

  @Override
  public boolean equals(Object other) {
    if (this == other) {
      return true;
    } else if (!(other instanceof UnknownTransform)) {
      return false;
    }

    UnknownTransform that = (UnknownTransform) other;
    return sourceType.equals(that.sourceType) && transform.equals(that.transform);
  }

  @Override
  public int hashCode() {
    return Objects.hash(sourceType, transform);
  }
}