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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
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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
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 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.functions.eq;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.cairo.sql.SymbolTableSource;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.SqlException;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.NegatableBooleanFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.IntList;
import io.questdb.std.Interval;
import io.questdb.std.ObjList;
import org.jetbrains.annotations.NotNull;

public class EqIntervalFunctionFactory implements FunctionFactory {

    @Override
    public String getSignature() {
        return "=(ΔΔ)";
    }

    @Override
    public boolean isBoolean() {
        return true;
    }

    @Override
    public Function newInstance(
            int position,
            ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) {
        final Function a = args.getQuick(0);
        final Function b = args.getQuick(1);

        if (a.isConstant()) {
            return createHalfConstantFunc(a, b);
        }
        if (b.isConstant()) {
            return createHalfConstantFunc(b, a);
        }
        if (a.isRuntimeConstant()) {
            return new HalfRuntimeConstFunc(a, b);
        }
        if (b.isRuntimeConstant()) {
            return new HalfRuntimeConstFunc(b, a);
        }
        return new Func(a, b);
    }

    private Function createHalfConstantFunc(Function constFunc, Function varFunc) {
        final Interval constValue = constFunc.getInterval(null);
        if (Interval.NULL.equals(constValue)) {
            return new NullCheckFunc(varFunc);
        }
        return new ConstCheckFunc(varFunc, constValue);
    }

    private static class ConstCheckFunc extends NegatableBooleanFunction implements UnaryFunction {
        private final Function arg;
        private final Interval constant;

        public ConstCheckFunc(Function arg, @NotNull Interval constant) {
            this.arg = arg;
            this.constant = constant;
        }

        @Override
        public Function getArg() {
            return arg;
        }

        @Override
        public boolean getBool(Record rec) {
            return negated != constant.equals(arg.getInterval(rec));
        }

        @Override
        public void toPlan(PlanSink sink) {
            sink.val(arg);
            if (negated) {
                sink.val('!');
            }
            sink.val("='").val(constant).val('\'');
        }
    }

    private static class Func extends AbstractEqBinaryFunction {

        public Func(Function left, Function right) {
            super(left, right);
        }

        @Override
        public boolean getBool(Record rec) {
            final Interval a = left.getInterval(rec);
            final Interval b = right.getInterval(rec);
            return negated != a.equals(b);
        }

        @Override
        public String getName() {
            if (negated) {
                return "!=";
            } else {
                return "=";
            }
        }
    }

    private static class HalfRuntimeConstFunc extends AbstractEqBinaryFunction {
        private Interval cachedRuntimeConst;

        public HalfRuntimeConstFunc(Function runtimeConst, Function arg) {
            super(arg, runtimeConst);
        }

        @Override
        public boolean getBool(Record rec) {
            final Interval a = left.getInterval(rec);
            return negated != a.equals(cachedRuntimeConst);
        }

        @Override
        public String getName() {
            if (negated) {
                return "!=";
            } else {
                return "=";
            }
        }

        @Override
        public void init(SymbolTableSource symbolTableSource, SqlExecutionContext executionContext) throws SqlException {
            super.init(symbolTableSource, executionContext);
            cachedRuntimeConst = right.getInterval(null);
        }
    }

    public static class NullCheckFunc extends NegatableBooleanFunction implements UnaryFunction {
        private final Function arg;

        public NullCheckFunc(Function arg) {
            this.arg = arg;
        }

        @Override
        public Function getArg() {
            return arg;
        }

        @Override
        public boolean getBool(Record rec) {
            return negated != (Interval.NULL.equals(arg.getInterval(rec)));
        }

        @Override
        public void toPlan(PlanSink sink) {
            sink.val(arg);
            if (negated) {
                sink.val(" is not null");
            } else {
                sink.val(" is null");
            }
        }
    }
}