/*
 * 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.paimon.data.columnar.heap;

import org.apache.paimon.data.InternalVector;
import org.apache.paimon.data.columnar.ColumnVector;
import org.apache.paimon.data.columnar.ColumnarVec;
import org.apache.paimon.data.columnar.VecColumnVector;

/**
 * Cast internal Vector to paimon readable vector(cast for Timestamp type and Decimal type) for
 * vector type.
 */
public class CastedVectorColumnVector implements VecColumnVector {

    private final HeapArrayVector heapArrayVector;
    private final ColumnVector[] children;
    private final int vectorSize;

    public CastedVectorColumnVector(
            HeapArrayVector heapArrayVector, ColumnVector child, int vectorSize) {
        this.heapArrayVector = heapArrayVector;
        this.children = new ColumnVector[] {child};
        this.vectorSize = vectorSize;
    }

    public CastedVectorColumnVector copy(ColumnVector child) {
        return new CastedVectorColumnVector(heapArrayVector, child, vectorSize);
    }

    @Override
    public InternalVector getVector(int i) {
        long offset = heapArrayVector.offsets[i];
        long length = heapArrayVector.lengths[i];
        if (length != vectorSize) {
            throw new IllegalArgumentException(
                    "Vector length mismatch: expected " + vectorSize + " but got " + length);
        }
        return ColumnarVec.DEFAULT_FACTORY.create(children[0], (int) offset, (int) length);
    }

    @Override
    public ColumnVector getColumnVector() {
        return children[0];
    }

    @Override
    public int getVectorSize() {
        return vectorSize;
    }

    @Override
    public boolean isNullAt(int i) {
        return heapArrayVector.isNullAt(i);
    }

    @Override
    public int getCapacity() {
        return heapArrayVector.getCapacity();
    }

    @Override
    public ColumnVector[] getChildren() {
        return children;
    }
}
