/**
 * @file    Backup.cpp
 * @ingroup SQLiteCpp
 * @brief   Backup is used to backup a database file in a safe and online way.
 *
 * Copyright (c) 2015 Shibao HONG (shibaohong@outlook.com)
 * Copyright (c) 2015-2019 Sebastien Rombauts (sebastien.rombauts@gmail.com)
 *
 * Distributed under the MIT License (MIT) (See accompanying file LICENSE.txt
 * or copy at http://opensource.org/licenses/MIT)
 */
#include <SQLiteCpp/Backup.h>
#include <SQLiteCpp/Exception.h>
#include <sqlite3.h>
namespace SQLite {
// Initialize resource for SQLite database backup
Backup::Backup(Database& aDestDatabase,
    const char* apDestDatabaseName,
    Database& aSrcDatabase,
    const char* apSrcDatabaseName)
    : mpSQLiteBackup(NULL)
{
    mpSQLiteBackup = sqlite3_backup_init(aDestDatabase.getHandle(),
        apDestDatabaseName,
        aSrcDatabase.getHandle(),
        apSrcDatabaseName);
    if (NULL == mpSQLiteBackup) {
        // If an error occurs, the error code and message are attached to the destination database connection.
        throw SQLite::Exception(aDestDatabase.getHandle());
    }
}
// Initialize resource for SQLite database backup
Backup::Backup(Database& aDestDatabase,
    const std::string& aDestDatabaseName,
    Database& aSrcDatabase,
    const std::string& aSrcDatabaseName)
    : mpSQLiteBackup(NULL)
{
    mpSQLiteBackup = sqlite3_backup_init(aDestDatabase.getHandle(),
        aDestDatabaseName.c_str(),
        aSrcDatabase.getHandle(),
        aSrcDatabaseName.c_str());
    if (NULL == mpSQLiteBackup) {
        // If an error occurs, the error code and message are attached to the destination database connection.
        throw SQLite::Exception(aDestDatabase.getHandle());
    }
}
// Initialize resource for SQLite database backup
Backup::Backup(Database& aDestDatabase, Database& aSrcDatabase)
    : mpSQLiteBackup(NULL)
{
    mpSQLiteBackup = sqlite3_backup_init(aDestDatabase.getHandle(),
        "main",
        aSrcDatabase.getHandle(),
        "main");
    if (NULL == mpSQLiteBackup) {
        // If an error occurs, the error code and message are attached to the destination database connection.
        throw SQLite::Exception(aDestDatabase.getHandle());
    }
}
// Release resource for SQLite database backup
Backup::~Backup()
{
    if (NULL != mpSQLiteBackup) {
        sqlite3_backup_finish(mpSQLiteBackup);
    }
}
// Execute backup step with a given number of source pages to be copied
int Backup::executeStep(const int aNumPage /* = -1 */)
{
    const int res = sqlite3_backup_step(mpSQLiteBackup, aNumPage);
    if (SQLITE_OK != res && SQLITE_DONE != res && SQLITE_BUSY != res && SQLITE_LOCKED != res) {
        throw SQLite::Exception(sqlite3_errstr(res), res);
    }
    return res;
}
// Get the number of remaining source pages to be copied in this backup process
int Backup::getRemainingPageCount()
{
    return sqlite3_backup_remaining(mpSQLiteBackup);
}
// Get the number of total source pages to be copied in this backup process
int Backup::getTotalPageCount()
{
    return sqlite3_backup_pagecount(mpSQLiteBackup);
}
} // namespace SQLite