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package org.hsqldb.persist;

import org.hsqldb.lib.LongLookup;

/**
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.5.1
 * @since 2.3.0
 */
public class DataSpaceManagerSimple implements DataSpaceManager {

    final DataFileCache     cache;
    final TableSpaceManager defaultSpaceManager;
    final int               fileBlockSize = fixedDiskBlockSize;
    long                    totalFragmentSize;
    int                     spaceIdSequence = tableIdFirst;
    LongLookup              lookup;

    /**
     * Used for non-space default, readonly, Text and Session data files
     */
    DataSpaceManagerSimple(DataFileCache cache, boolean isReadOnly) {

        this.cache = cache;

        if (cache instanceof DataFileCacheSession) {
            defaultSpaceManager = new TableSpaceManagerSimple(cache);
        } else if (cache instanceof TextCache) {
            defaultSpaceManager = new TableSpaceManagerSimple(cache);
        } else {
            int capacity = cache.database.logger.propMaxFreeBlocks;

            defaultSpaceManager = new TableSpaceManagerBlocks(this,
                    tableIdDefault, fileBlockSize, capacity,
                    cache.getDataFileScale());

            if (!isReadOnly) {
                initialiseSpaces();

                cache.spaceManagerPosition = 0;
            }
        }

        totalFragmentSize = cache.lostSpaceSize;
    }

    public TableSpaceManager getDefaultTableSpace() {
        return defaultSpaceManager;
    }

    public TableSpaceManager getTableSpace(int spaceId) {

        if (spaceId >= spaceIdSequence) {
            spaceIdSequence = spaceId + 2;
        }

        return defaultSpaceManager;
    }

    public int getNewTableSpaceID() {

        int id = spaceIdSequence;

        spaceIdSequence += 2;

        return id;
    }

    public long getFileBlocks(int spaceId, int blockCount) {

        long filePosition = cache.getFileFreePos();

        cache.enlargeFileSpace(filePosition
                               + (long) blockCount * fileBlockSize);

        return filePosition;
    }

    public void initialiseTableSpace(TableSpaceManagerBlocks tableSpace) {}

    public void freeTableSpace(int spaceId) {}

    public void freeTableSpace(int spaceId, LongLookup spaceList, long offset,
                               long limit) {

        totalFragmentSize += spaceList.getTotalValues()
                             * cache.getDataFileScale();

        if (cache.fileFreePosition == limit) {
            cache.writeLock.lock();

            try {
                cache.fileFreePosition = offset;
            } finally {
                cache.writeLock.unlock();
            }
        } else {
            totalFragmentSize += limit - offset;
        }

        if (spaceList.size() != 0) {
            lookup = spaceList.duplicate();
        }
    }

    public long getLostBlocksSize() {
        return totalFragmentSize + defaultSpaceManager.getLostBlocksSize();
    }

    public int getFileBlockSize() {
        return 1024 * 1024 * cache.getDataFileScale() / 16;
    }

    public boolean isModified() {
        return true;
    }

    public void initialiseSpaces() {

        long filePosition = cache.getFileFreePos();
        long totalBlocks = (filePosition + fileBlockSize) / fileBlockSize;

        long lastFreePosition = cache.enlargeFileSpace(totalBlocks
            * fileBlockSize);

        defaultSpaceManager.initialiseFileBlock(lookup, lastFreePosition,
                cache.getFileFreePos());

        if (lookup != null) {
            totalFragmentSize -= lookup.getTotalValues()
                                 * cache.getDataFileScale();
            lookup = null;
        }
    }

    public void reset() {
        defaultSpaceManager.reset();
    }

    public boolean isMultiSpace() {
        return false;
    }

    public int getFileBlockItemCount() {
        return 1024 * 64;
    }

    public DirectoryBlockCachedObject[] getDirectoryList() {
        return new DirectoryBlockCachedObject[0];
    }
}
