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 *  You may obtain a copy of the License at
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 *  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.griffin.AbstractBooleanFunctionFactory;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.SqlException;
import io.questdb.griffin.engine.functions.BooleanFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.Long256;
import io.questdb.std.Numbers;
import io.questdb.std.NumericException;
import io.questdb.std.ObjList;

public class EqLong256StrFunctionFactory extends AbstractBooleanFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "=(Hs)";
    }

    @Override
    public Function newInstance(ObjList args, int position, CairoConfiguration configuration) throws SqlException {
        final CharSequence hexLong256 = args.getQuick(1).getStr(null);
        int len = hexLong256.length();
        int n;

        long long0 = 0;
        long long1 = 0;
        long long2 = 0;
        long long3 = 0;
        try {
            n = Math.max(0, len - 16);
            if (len > 0) {
                long0 = Numbers.parseHexLong(hexLong256, n, len);
                len = n;
            }

            n = Math.max(0, len - 16);
            if (len > 0) {
                long1 = Numbers.parseHexLong(hexLong256, n, len);
                len = n;
            }

            n = Math.max(0, len - 16);
            if (len > 0) {
                long2 = Numbers.parseHexLong(hexLong256, n, len);
                len = n;
            }

            n = Math.max(0, len - 16);
            if (len > 0) {
                long3 = Numbers.parseHexLong(hexLong256, n, len);
                len = n;
            }

            if (len > 2) {
                throw SqlException.position(args.getQuick(1).getPosition()).put("value is too long");
            }

            return new Func(position, args.getQuick(0), long0, long1, long2, long3, isNegated);
        } catch (NumericException e) {
            throw SqlException.position(args.getQuick(1).getPosition()).put("invalid hex value for long256");
        }

    }

    private class Func extends BooleanFunction implements UnaryFunction {
        private final boolean isNegated;
        private final Function arg;
        private final long long0;
        private final long long1;
        private final long long2;
        private final long long3;

        public Func(int position, Function arg, long long0, long long1, long long2, long long3, boolean isNegated) {
            super(position);
            this.arg = arg;
            this.long0 = long0;
            this.long1 = long1;
            this.long2 = long2;
            this.long3 = long3;
            this.isNegated = isNegated;
        }

        @Override
        public boolean getBool(Record rec) {
            final Long256 value = arg.getLong256A(rec);
            return isNegated != (
                    value.getLong0() == long0 &&
                    value.getLong1() == long1 &&
                    value.getLong2() == long2 &&
                    value.getLong3() == long3
            );
        }

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