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QuestDB is high performance SQL time series database
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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 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.
 *  See the License for the specific language governing permissions and
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package io.questdb.griffin.engine.functions.bool;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.ColumnType;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.cairo.sql.StaticSymbolTable;
import io.questdb.cairo.sql.SymbolTableSource;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.SqlException;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BooleanFunction;
import io.questdb.griffin.engine.functions.SymbolFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.griffin.engine.functions.constants.BooleanConstant;
import io.questdb.std.CharSequenceHashSet;
import io.questdb.std.Chars;
import io.questdb.std.IntHashSet;
import io.questdb.std.ObjList;

public class InSymbolFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "in(Kv)";
    }

    @Override
    public Function newInstance(ObjList args, int position, CairoConfiguration configuration) throws SqlException {

        CharSequenceHashSet set = new CharSequenceHashSet();
        int n = args.size();

        if (n == 1) {
            return new BooleanConstant(position, false);
        }

        for (int i = 1; i < n; i++) {
            Function func = args.getQuick(i);
            switch (func.getType()) {
                case ColumnType.STRING:
                    CharSequence value = func.getStr(null);
                    if (value == null) {
                        set.add(null);
                    } else {
                        set.add(Chars.toString(value));
                    }
                    break;
                case ColumnType.CHAR:
                    set.add(new String(new char[]{func.getChar(null)}));
                    break;
                default:
                    throw SqlException.$(func.getPosition(), "STRING constant expected");
            }
        }
        SymbolFunction var = (SymbolFunction) args.getQuick(0);
        if (var.isConstant()) {
            return new BooleanConstant(position, set.contains(var.getSymbol(null)));
        }
        return new Func(position, var, set);
    }

    @FunctionalInterface
    private interface TestFunc {
        boolean test(Record rec);
    }

    private static class Func extends BooleanFunction implements UnaryFunction {
        private final SymbolFunction arg;
        private final CharSequenceHashSet set;
        private final IntHashSet intSet = new IntHashSet();
        private final TestFunc intTest = this::testAsInt;
        private final TestFunc strTest = this::testAsString;
        private TestFunc testFunc;

        public Func(int position, SymbolFunction arg, CharSequenceHashSet set) {
            super(position);
            this.arg = arg;
            this.set = set;
        }

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

        @Override
        public boolean getBool(Record rec) {
            return testFunc.test(rec);
        }

        @Override
        public void init(SymbolTableSource symbolTableSource, SqlExecutionContext executionContext) {
            arg.init(symbolTableSource, executionContext);
            final StaticSymbolTable symbolTable = arg.getStaticSymbolTable();
            if (symbolTable != null) {
                intSet.clear();
                for (int i = 0, n = set.size(); i < n; i++) {
                    intSet.add(symbolTable.keyOf(set.get(i)));
                }
                testFunc = intTest;
            } else {
                testFunc = strTest;
            }
        }

        private boolean testAsString(Record rec) {
            return set.contains(arg.getSymbol(rec));
        }

        private boolean testAsInt(Record rec) {
            return intSet.contains(arg.getInt(rec));
        }
    }
}