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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

/*
SQLite format specification:
	blocks:
		(PK) INT id
		BLOB data
*/


#include "database-sqlite3.h"

#include "log.h"
#include "filesys.h"
#include "exceptions.h"
#include "settings.h"
#include "porting.h"
#include "util/string.h"

#include <cassert>

// When to print messages when the database is being held locked by another process
// Note: I've seen occasional delays of over 250ms while running minetestmapper.
#define BUSY_INFO_TRESHOLD	100	// Print first informational message after 100ms.
#define BUSY_WARNING_TRESHOLD	250	// Print warning message after 250ms. Lag is increased.
#define BUSY_ERROR_TRESHOLD	1000	// Print error message after 1000ms. Significant lag.
#define BUSY_FATAL_TRESHOLD	3000	// Allow SQLITE_BUSY to be returned, which will cause a minetest crash.
#define BUSY_ERROR_INTERVAL	10000	// Safety net: report again every 10 seconds


#define SQLRES(s, r, m) \
	if ((s) != (r)) { \
		throw FileNotGoodException(std::string(m) + ": " +\
				sqlite3_errmsg(m_database)); \
	}
#define SQLOK(s, m) SQLRES(s, SQLITE_OK, m)

#define PREPARE_STATEMENT(name, query) \
	SQLOK(sqlite3_prepare_v2(m_database, query, -1, &m_stmt_##name, NULL),\
		"Failed to prepare query '" query "'")

#define FINALIZE_STATEMENT(statement) \
	SQLOK(sqlite3_finalize(statement), "Failed to finalize " #statement)

int Database_SQLite3::busyHandler(void *data, int count)
{
	s64 &first_time = reinterpret_cast<s64 *>(data)[0];
	s64 &prev_time = reinterpret_cast<s64 *>(data)[1];
	s64 cur_time = getTimeMs();

	if (count == 0) {
		first_time = cur_time;
		prev_time = first_time;
	} else {
		while (cur_time < prev_time)
			cur_time += s64(1)<<32;
	}

	if (cur_time - first_time < BUSY_INFO_TRESHOLD) {
		; // do nothing
	} else if (cur_time - first_time >= BUSY_INFO_TRESHOLD &&
			prev_time - first_time < BUSY_INFO_TRESHOLD) {
		infostream << "SQLite3 database has been locked for "
			<< cur_time - first_time << " ms." << std::endl;
	} else if (cur_time - first_time >= BUSY_WARNING_TRESHOLD &&
			prev_time - first_time < BUSY_WARNING_TRESHOLD) {