/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "IDBFactoryBackendImpl.h"

#include "DOMStringList.h"
#include "FileSystem.h"
#include "IDBDatabaseBackendImpl.h"
#include "IDBDatabaseException.h"
#include "SQLiteDatabase.h"
#include "SecurityOrigin.h"
#include <wtf/Threading.h>
#include <wtf/UnusedParam.h>

#if ENABLE(INDEXED_DATABASE)

namespace WebCore {

IDBFactoryBackendImpl::IDBFactoryBackendImpl()
{
}

IDBFactoryBackendImpl::~IDBFactoryBackendImpl()
{
}

static PassOwnPtr<SQLiteDatabase> openSQLiteDatabase(SecurityOrigin* securityOrigin, String name)
{
    String pathBase = "/tmp/temporary-indexed-db-files"; // FIXME: Write a PageGroupSettings class and have this value come from that.
    if (!makeAllDirectories(pathBase)) {
        // FIXME: Is there any other thing we could possibly do to recover at this point? If so, do it rather than just erroring out.
        LOG_ERROR("Unabled to create LocalStorage database path %s", pathBase.utf8().data());
        return 0;
    }

    String databaseIdentifier = securityOrigin->databaseIdentifier();
    String santizedName = encodeForFileName(name);
    String path = pathByAppendingComponent(pathBase, databaseIdentifier + "_" + santizedName + ".indexeddb");
    
    OwnPtr<SQLiteDatabase> sqliteDatabase = adoptPtr(new SQLiteDatabase());
    if (!sqliteDatabase->open(path)) {
        // FIXME: Is there any other thing we could possibly do to recover at this point? If so, do it rather than just erroring out.
        LOG_ERROR("Failed to open database file %s for IndexedDB", path.utf8().data());
        return 0;
    }

    return sqliteDatabase.release();
}

static bool createTables(SQLiteDatabase* sqliteDatabase)
{
    static const char* commands[] = {
        "CREATE TABLE IF NOT EXISTS MetaData (name TEXT, description TEXT, version TEXT)"
        };

    for (size_t i = 0; i < arraysize(commands); ++i) {
        if (!sqliteDatabase->executeCommand(commands[i])) {
            // FIXME: We should try to recover from this situation. Maybe nuke the database and start over?
            LOG_ERROR("Failed to run the following command for IndexedDB: %s", commands[i]);
            return false;
        }
    }
    return true;
}

void IDBFactoryBackendImpl::open(const String& name, const String& description, PassRefPtr<IDBCallbacks> callbacks, PassRefPtr<SecurityOrigin> securityOrigin, Frame*)
{
    IDBDatabaseBackendMap::iterator it = m_databaseBackendMap.find(name);
    if (it != m_databaseBackendMap.end()) {
        if (!description.isNull())
            it->second->setDescription(description); // The description may have changed.
        callbacks->onSuccess(it->second.get());
        return;
    }

    // FIXME: Everything from now on should be done on another thread.

    OwnPtr<SQLiteDatabase> sqliteDatabase = openSQLiteDatabase(securityOrigin.get(), name);
    if (!sqliteDatabase || !createTables(sqliteDatabase.get())) {
        callbacks->onError(IDBDatabaseError::create(IDBDatabaseException::UNKNOWN_ERR, "Internal error."));
        return;
    }

    RefPtr<IDBDatabaseBackendImpl> databaseBackend = IDBDatabaseBackendImpl::create(name, description, sqliteDatabase.release());
    callbacks->onSuccess(databaseBackend.get());
    m_databaseBackendMap.set(name, databaseBackend.release());
}

} // namespace WebCore

#endif // ENABLE(INDEXED_DATABASE)