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 *  http://www.apache.org/licenses/LICENSE-2.0
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package io.questdb.griffin.engine.functions.columns;

import io.questdb.cairo.ColumnType;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.engine.functions.GeoLongFunction;
import org.jetbrains.annotations.TestOnly;

import static io.questdb.griffin.engine.functions.columns.ColumnUtils.STATIC_COLUMN_COUNT;

public class GeoLongColumn extends GeoLongFunction {
    private static final GeoLongColumn[] COLUMNS;

    private final int columnIndex;

    public GeoLongColumn(int columnIndex, int columnType) {
        super(columnType);
        this.columnIndex = columnIndex;
    }

    public static GeoLongColumn newInstance(int columnIndex, int columnType) {
        assert ColumnType.getGeoHashBits(columnType) >= ColumnType.GEOLONG_MIN_BITS &&
                ColumnType.getGeoHashBits(columnType) <= ColumnType.GEOLONG_MAX_BITS;

        final int bits = (ColumnType.GEOLONG_MAX_BITS - ColumnType.GEOLONG_MIN_BITS + 1);

        if (columnIndex < STATIC_COLUMN_COUNT) {
            return COLUMNS[columnIndex * bits + ColumnType.getGeoHashBits(columnType) - ColumnType.GEOLONG_MIN_BITS];
        }

        return new GeoLongColumn(columnIndex, columnType);
    }

    @TestOnly
    public int getColumnIndex() {
        return columnIndex;
    }

    @Override
    public long getGeoLong(Record rec) {
        return rec.getGeoLong(columnIndex);
    }

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

    @Override
    public void toPlan(PlanSink sink) {
        sink.putColumnName(columnIndex);
    }

    static {
        int bits = ColumnType.GEOLONG_MAX_BITS - ColumnType.GEOLONG_MIN_BITS + 1;
        COLUMNS = new GeoLongColumn[STATIC_COLUMN_COUNT * bits];

        for (int col = 0; col < STATIC_COLUMN_COUNT; col++) {
            for (int bit = ColumnType.GEOLONG_MIN_BITS; bit <= ColumnType.GEOLONG_MAX_BITS; bit++) {
                COLUMNS[col * bits + bit - ColumnType.GEOLONG_MIN_BITS] = new GeoLongColumn(col, ColumnType.getGeoHashTypeWithBits(bit));
            }
        }
    }
}