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 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2023 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
 *  limitations under the License.
 *
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package io.questdb.cairo;

import io.questdb.cairo.sql.TableRecordMetadata;
import io.questdb.cairo.vm.Vm;
import io.questdb.cairo.vm.api.MemoryMR;
import io.questdb.std.Chars;

class TableWriterMetadata extends AbstractRecordMetadata implements TableRecordMetadata {
    private int maxUncommittedRows;
    private long o3MaxLag;
    private long metadataVersion;
    private int symbolMapCount;
    private int tableId;
    private TableToken tableToken;
    private int version;
    private boolean walEnabled;

    public TableWriterMetadata(TableToken tableToken, MemoryMR metaMem) {
        this.tableToken = tableToken;
        reload(metaMem);
    }

    @Override
    public void close() {
        // nothing to release
    }

    @Override
    public int getMaxUncommittedRows() {
        return maxUncommittedRows;
    }

    @Override
    public long getO3MaxLag() {
        return o3MaxLag;
    }

    @Override
    public long getMetadataVersion() {
        return metadataVersion;
    }

    public int getSymbolMapCount() {
        return symbolMapCount;
    }

    @Override
    public int getTableId() {
        return tableId;
    }

    @Override
    public TableToken getTableToken() {
        return tableToken;
    }

    public int getTableVersion() {
        return version;
    }

    @Override
    public boolean isWalEnabled() {
        return walEnabled;
    }

    public final void reload(MemoryMR metaMem) {
        this.columnCount = metaMem.getInt(TableUtils.META_OFFSET_COUNT);
        this.columnNameIndexMap.clear();
        this.version = metaMem.getInt(TableUtils.META_OFFSET_VERSION);
        this.tableId = metaMem.getInt(TableUtils.META_OFFSET_TABLE_ID);
        this.maxUncommittedRows = metaMem.getInt(TableUtils.META_OFFSET_MAX_UNCOMMITTED_ROWS);
        this.o3MaxLag = metaMem.getLong(TableUtils.META_OFFSET_O3_MAX_LAG);
        TableUtils.validateMeta(metaMem, columnNameIndexMap, ColumnType.VERSION);
        this.timestampIndex = metaMem.getInt(TableUtils.META_OFFSET_TIMESTAMP_INDEX);
        this.columnMetadata.clear();
        this.metadataVersion = metaMem.getLong(TableUtils.META_OFFSET_METADATA_VERSION);
        this.walEnabled = metaMem.getBool(TableUtils.META_OFFSET_WAL_ENABLED);

        long offset = TableUtils.getColumnNameOffset(columnCount);
        this.symbolMapCount = 0;
        columnNameIndexMap.clear();
        // don't create strings in this loop, we already have them in columnNameIndexMap
        for (int i = 0; i < columnCount; i++) {
            CharSequence name = metaMem.getStr(offset);
            assert name != null;
            int type = TableUtils.getColumnType(metaMem, i);
            String nameStr = Chars.toString(name);
            columnMetadata.add(
                    new TableColumnMetadata(
                            nameStr,
                            type,
                            TableUtils.isColumnIndexed(metaMem, i),
                            TableUtils.getIndexBlockCapacity(metaMem, i),
                            true,
                            null,
                            i
                    )
            );
            columnNameIndexMap.put(nameStr, i);
            if (ColumnType.isSymbol(type)) {
                symbolMapCount++;
            }
            offset += Vm.getStorageLength(name);
        }
    }

    public void setMaxUncommittedRows(int rows) {
        this.maxUncommittedRows = rows;
    }

    public void setO3MaxLag(long o3MaxLagUs) {
        this.o3MaxLag = o3MaxLagUs;
    }

    public void setMetadataVersion(long value) {
        this.metadataVersion = value;
    }

    public void setTableVersion() {
        version = ColumnType.VERSION;
    }

    public void updateTableToken(TableToken tableToken) {
        this.tableToken = tableToken;
    }

    void addColumn(CharSequence name, int type, boolean indexFlag, int indexValueBlockCapacity, int columnIndex) {
        String str = name.toString();
        columnNameIndexMap.put(str, columnMetadata.size());
        columnMetadata.add(
                new TableColumnMetadata(
                        str,
                        type,
                        indexFlag,
                        indexValueBlockCapacity,
                        true,
                        null,
                        columnIndex
                )
        );
        columnCount++;
        if (ColumnType.isSymbol(type)) {
            symbolMapCount++;
        }
    }

    void clearTimestampIndex() {
        this.timestampIndex = -1;
    }

    void removeColumn(int columnIndex) {
        TableColumnMetadata deletedMeta = columnMetadata.getQuick(columnIndex);
        if (ColumnType.isSymbol(deletedMeta.getType())) {
            symbolMapCount--;
        }
        deletedMeta.markDeleted();
        columnNameIndexMap.remove(deletedMeta.getName());
    }

    void renameColumn(CharSequence name, CharSequence newName) {
        final int columnIndex = columnNameIndexMap.removeEntry(name);
        String newNameStr = Chars.toString(newName);
        columnNameIndexMap.put(newNameStr, columnIndex);

        TableColumnMetadata oldColumnMetadata = columnMetadata.get(columnIndex);
        oldColumnMetadata.setName(newNameStr);
    }
}