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 *  http://www.apache.org/licenses/LICENSE-2.0
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package io.questdb.griffin.engine.functions;

import org.jetbrains.annotations.TestOnly;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.griffin.FunctionFactory;

import static io.questdb.griffin.FunctionFactoryDescriptor.replaceSignatureName;

import io.questdb.griffin.SqlException;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.constants.BooleanConstant;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;
import io.questdb.std.Transient;

public class NegatingFunctionFactory implements FunctionFactory {
    private final FunctionFactory delegate;
    private final String signature;

    public NegatingFunctionFactory(String name, FunctionFactory delegate) throws SqlException {
        this.signature = replaceSignatureName(name, delegate.getSignature());
        this.delegate = delegate;
    }

    @TestOnly
    public FunctionFactory getDelegate() {
        return delegate;
    }

    @Override
    public String getSignature() {
        return signature;
    }

    @Override
    public Function newInstance(
            int position,
            @Transient ObjList args,
            @Transient IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) throws SqlException {
        Function function = delegate.newInstance(position, args, argPositions, configuration, sqlExecutionContext);
        if (function instanceof NegatableBooleanFunction) {
            NegatableBooleanFunction negatableFunction = (NegatableBooleanFunction) function;
            negatableFunction.setNegated();
            return negatableFunction;
        }
        if (function instanceof BooleanConstant) {
            return BooleanConstant.of(!function.getBool(null));
        }
        throw SqlException.$(position, "negating operation is not supported for result of function ").put(delegate.getSignature());
    }
}