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/*
 * 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
 *
 *     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 io.trino.operator.scalar;

import io.trino.spi.block.Block;
import io.trino.spi.function.Convention;
import io.trino.spi.function.Description;
import io.trino.spi.function.OperatorDependency;
import io.trino.spi.function.ScalarFunction;
import io.trino.spi.function.SqlNullable;
import io.trino.spi.function.SqlType;
import io.trino.spi.function.TypeParameter;
import io.trino.spi.type.StandardTypes;

import java.lang.invoke.MethodHandle;

import static io.trino.spi.function.InvocationConvention.InvocationArgumentConvention.BLOCK_POSITION_NOT_NULL;
import static io.trino.spi.function.InvocationConvention.InvocationReturnConvention.FAIL_ON_NULL;
import static io.trino.spi.function.OperatorType.READ_VALUE;
import static java.lang.Boolean.TRUE;

@Description("Returns true if the array contains one or more elements that match the given predicate")
@ScalarFunction("any_match")
public final class ArrayAnyMatchFunction
{
    private ArrayAnyMatchFunction() {}

    @TypeParameter("T")
    @SqlType(StandardTypes.BOOLEAN)
    @SqlNullable
    public static Boolean anyMatch(
            @OperatorDependency(operator = READ_VALUE, argumentTypes = "T", convention = @Convention(arguments = BLOCK_POSITION_NOT_NULL, result = FAIL_ON_NULL)) MethodHandle readValue,
            @SqlType("array(T)") Block arrayBlock,
            @SqlType("function(T, boolean)") ObjectToBooleanFunction function)
            throws Throwable
    {
        boolean hasNullResult = false;
        int positionCount = arrayBlock.getPositionCount();
        for (int i = 0; i < positionCount; i++) {
            Object element = null;
            if (!arrayBlock.isNull(i)) {
                element = readValue.invoke(arrayBlock, i);
            }
            Boolean match = function.apply(element);
            if (TRUE.equals(match)) {
                return true;
            }
            if (match == null) {
                hasNullResult = true;
            }
        }
        if (hasNullResult) {
            return null;
        }
        return false;
    }
}