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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");
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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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 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.griffin.engine.functions.date;

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.SqlException;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.DateFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.IntList;
import io.questdb.std.Numbers;
import io.questdb.std.NumericException;
import io.questdb.std.ObjList;
import io.questdb.std.datetime.DateFormat;
import io.questdb.std.datetime.DateLocale;
import io.questdb.std.datetime.millitime.DateFormatFactory;

public class ToDateFunctionFactory implements FunctionFactory {
    @Override
    public String getSignature() {
        return "to_date(Ss)";
    }

    @Override
    public Function newInstance(int position, ObjList args, IntList argPositions, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) throws SqlException {
        final Function arg = args.getQuick(0);
        final CharSequence pattern = args.getQuick(1).getStrA(null);
        if (pattern == null) {
            throw SqlException.$(argPositions.getQuick(1), "pattern is required");
        }
        return new ToDateFunction(arg, DateFormatFactory.INSTANCE.get(pattern), configuration.getDefaultDateLocale(), pattern);
    }

    private static final class ToDateFunction extends DateFunction implements UnaryFunction {
        private final Function arg;
        private final DateFormat dateFormat;
        private final DateLocale locale;
        private final CharSequence pattern;

        public ToDateFunction(Function arg, DateFormat dateFormat, DateLocale locale, CharSequence pattern) {
            this.arg = arg;
            this.dateFormat = dateFormat;
            this.locale = locale;
            this.pattern = pattern;
        }

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

        @Override
        public long getDate(Record rec) {
            CharSequence value = arg.getStrA(rec);
            try {
                if (value != null) {
                    return dateFormat.parse(value, locale);
                }
            } catch (NumericException ignore) {
            }
            return Numbers.LONG_NULL;
        }

        @Override
        public void toPlan(PlanSink sink) {
            sink.val("to_date(").val(arg).val(',').val(pattern).val(')');
        }
    }
}