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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.sql.ir;

import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.google.common.collect.ImmutableList;
import io.trino.spi.type.Type;
import io.trino.sql.planner.Symbol;
import io.trino.type.FunctionType;

import java.util.List;
import java.util.stream.Collectors;

import static java.util.Objects.requireNonNull;

@JsonSerialize
public record Lambda(List arguments, Expression body)
        implements Expression
{
    public Lambda
    {
        requireNonNull(arguments, "arguments is null");
        requireNonNull(body, "body is null");
    }

    @Override
    public Type type()
    {
        return new FunctionType(
                arguments.stream().map(Symbol::type).collect(Collectors.toList()),
                body.type());
    }

    @Override
    public  R accept(IrVisitor visitor, C context)
    {
        return visitor.visitLambda(this, context);
    }

    @Override
    public List children()
    {
        return ImmutableList.of(body);
    }

    @Override
    public String toString()
    {
        return "(%s) -> %s".formatted(
                arguments.stream()
                        .map(Symbol::toString).collect(Collectors.joining(", ")),
                body);
    }
}