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package org.hsqldb.persist;

import org.hsqldb.Row;
import org.hsqldb.RowAVL;
import org.hsqldb.RowAction;
import org.hsqldb.Session;
import org.hsqldb.Table;
import org.hsqldb.TableBase;
import org.hsqldb.index.Index;
import org.hsqldb.index.NodeAVL;
import org.hsqldb.navigator.RowIterator;

/*
 * Implementation of PersistentStore for information schema and temp tables.
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.5.0
 * @since 2.0.1
 */
public class RowStoreAVLHybridExtended extends RowStoreAVLHybrid {

    Session session;

    public RowStoreAVLHybridExtended(Session session, TableBase table,
                                     boolean diskBased) {

        super(session, table, diskBased);

        this.session = session;
    }

    public CachedObject getNewCachedObject(Session session, Object object,
                                           boolean tx) {

        if (!resettingAccessor && table.getIndexCount() != indexList.length) {
            resetAccessorKeys(session, table.getIndexList());
        }

        return super.getNewCachedObject(session, object, tx);
    }

    public synchronized void add(Session session, CachedObject object,
                                 boolean tx) {

        super.add(session, object, tx);

        if (tx) {
            RowAction.addInsertAction(session, table, this, (Row) object);
        }
    }

    public void indexRow(Session session, Row row) {

        NodeAVL node  = ((RowAVL) row).getNode(0);
        int     count = 0;

        while (node != null) {
            count++;

            node = node.nNext;
        }

        if (isCached && row.isMemory() || count != indexList.length) {
            row = (Row) getNewCachedObject(session, row.getData(), true);
        }

        super.indexRow(session, row);
    }

    /**
     * Row might have changed from memory to disk or indexes added
     */
    public void delete(Session session, Row row) {

        NodeAVL node  = ((RowAVL) row).getNode(0);
        int     count = 0;

        while (node != null) {
            count++;

            node = node.nNext;
        }

        if ((isCached && row.isMemory()) || count != indexList.length) {
            row = ((Table) table).getDeleteRowFromLog(session, row.getData());
        }

        if (row != null) {
            super.delete(session, row);
        }
    }

    public synchronized double searchCost(Session session, Index index,
                                          int count, int opType) {

        if (table.getIndexCount() != indexList.length) {
            resetAccessorKeys(session, table.getIndexList());
        }

        return super.searchCost(session, index, count, opType);
    }

    boolean resettingAccessor = false;

    public CachedObject getAccessor(Index key) {

        if (!resettingAccessor && key.getPosition() > 0
                && table.getIndexCount() != indexList.length) {
            resetAccessorKeys(session, table.getIndexList());
        }

        return super.getAccessor(key);
    }

    public synchronized void resetAccessorKeys(Session session, Index[] keys) {

        resettingAccessor = true;

        try {
            if (indexList.length == 0 || accessorList[0] == null) {
                indexList    = keys;
                accessorList = new CachedObject[indexList.length];

                return;
            }

            boolean result;

            if (isCached) {
                resetAccessorKeysCached(keys);
            } else {
                super.resetAccessorKeys(session, keys);
            }
        } finally {
            resettingAccessor = false;
        }
    }

    private void resetAccessorKeysCached(Index[] keys) {

        RowStoreAVLHybrid tempStore = new RowStoreAVLHybridExtended(session,
            table, true);

        tempStore.changeToDiskTable(session);

        tempStore.indexList    = indexList;
        tempStore.accessorList = accessorList;

        tempStore.elementCount.set(elementCount.get());

        //
        indexList    = keys;
        accessorList = new CachedObject[indexList.length];

        elementCount.set(0);

        RowIterator iterator = tempStore.rowIterator();

        while (iterator.next()) {
            Row row = iterator.getCurrentRow();
            Row newRow = (Row) getNewCachedObject(session, row.getData(),
                                                  false);

            indexRow(session, newRow);
        }
    }
}
