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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
 *
 *  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.
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package io.questdb.griffin.engine.functions.str;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BinaryFunction;
import io.questdb.griffin.engine.functions.IntFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.griffin.engine.functions.constants.IntConstant;
import io.questdb.std.IntList;
import io.questdb.std.Numbers;
import io.questdb.std.ObjList;
import io.questdb.std.str.Utf8Sequence;
import io.questdb.std.str.Utf8s;

public class StrPosVarcharFunctionFactory implements FunctionFactory {

    @Override
    public String getSignature() {
        return "strpos(ØØ)";
    }

    @Override
    public Function newInstance(
            int position,
            ObjList args,
            IntList argPositions,
            CairoConfiguration configuration,
            SqlExecutionContext sqlExecutionContext
    ) {
        final Function substrFunc = args.getQuick(1);
        if (substrFunc.isConstant()) {
            Utf8Sequence substr = substrFunc.getVarcharA(null);
            if (substr == null) {
                return IntConstant.NULL;
            }
            return new ConstFunc(args.getQuick(0), substr);
        }
        return new Func(args.getQuick(0), substrFunc);
    }

    private static class ConstFunc extends IntFunction implements UnaryFunction {

        private final Utf8Sequence substr;
        private final Function varcharFunc;

        public ConstFunc(Function varcharFunc, Utf8Sequence substr) {
            this.varcharFunc = varcharFunc;
            this.substr = substr;
        }

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

        @Override
        public int getInt(Record rec) {
            final Utf8Sequence str = this.varcharFunc.getVarcharA(rec);
            if (str == null) {
                return Numbers.INT_NULL;
            }
            return Utf8s.strpos(str, substr);
        }

        @Override
        public void toPlan(PlanSink sink) {
            sink.val("strpos(").val(varcharFunc).val(",'").val(substr).val("')");
        }
    }

    private static class Func extends IntFunction implements BinaryFunction {

        private final Function strFunc;
        private final Function substrFunc;

        public Func(Function strFunc, Function substrFunc) {
            this.strFunc = strFunc;
            this.substrFunc = substrFunc;
        }

        @Override
        public int getInt(Record rec) {
            final Utf8Sequence str = this.strFunc.getVarcharA(rec);
            if (str == null) {
                return Numbers.INT_NULL;
            }
            final Utf8Sequence substr = this.substrFunc.getVarcharA(rec);
            if (substr == null) {
                return Numbers.INT_NULL;
            }
            return Utf8s.strpos(str, substr);
        }

        @Override
        public Function getLeft() {
            return strFunc;
        }

        @Override
        public String getName() {
            return "strpos";
        }

        @Override
        public Function getRight() {
            return substrFunc;
        }
    }
}