/*  MiniDLNA media server
 *  Copyright (C) 2008-2009  Justin Maggard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <stdio.h>
#include <unistd.h>
#include "sql.h"
#include "log.h"

int
sql_exec(sqlite3 *db, const char *fmt, ...)
{
	int ret;
	char *errMsg = NULL;
	char *sql;
	va_list ap;
	//DPRINTF(E_DEBUG, L_DB_SQL, "SQL: %s\n", sql);

	va_start(ap, fmt);

	sql = sqlite3_vmprintf(fmt, ap);
	ret = sqlite3_exec(db, sql, 0, 0, &errMsg);
	if( ret != SQLITE_OK )
	{
		DPRINTF(E_ERROR, L_DB_SQL, "SQL ERROR %d [%s]\n%s\n", ret, errMsg, sql);
		if (errMsg)
			sqlite3_free(errMsg);
	}
	sqlite3_free(sql);

	return ret;
}

int
sql_get_table(sqlite3 *db, const char *sql, char ***pazResult, int *pnRow, int *pnColumn)
{
	int ret;
	char *errMsg = NULL;
	//DPRINTF(E_DEBUG, L_DB_SQL, "SQL: %s\n", sql);
	
	ret = sqlite3_get_table(db, sql, pazResult, pnRow, pnColumn, &errMsg);
	if( ret != SQLITE_OK )
	{
		DPRINTF(E_ERROR, L_DB_SQL, "SQL ERROR %d [%s]\n%s\n", ret, errMsg, sql);
		if (errMsg)
			sqlite3_free(errMsg);
	}

	return ret;
}

int
sql_get_int_field(sqlite3 *db, const char *fmt, ...)
{
	va_list		ap;
	int		counter, result;
	char		*sql;
	int		ret;
	sqlite3_stmt	*stmt;
	
	va_start(ap, fmt);

	sql = sqlite3_vmprintf(fmt, ap);

	//DPRINTF(E_DEBUG, L_DB_SQL, "sql: %s\n", sql);

	switch (sqlite3_prepare_v2(db, sql, -1, &stmt, NULL))
	{
		case SQLITE_OK:
			break;
		default:
			DPRINTF(E_ERROR, L_DB_SQL, "prepare failed: %s\n", sqlite3_errmsg(db));
			sqlite3_free(sql);
			return -1;
	}
	sqlite3_free(sql);

	for (counter = 0;
	     ((result = sqlite3_step(stmt)) == SQLITE_BUSY || result == SQLITE_LOCKED) && counter < 2;
	     counter++) {
		 /* While SQLITE_BUSY has a built in timeout,
		    SQLITE_LOCKED does not, so sleep */
		 if (result == SQLITE_LOCKED)
		 	sleep(1);
	}

	switch (result)
	{
		case SQLITE_DONE:
			/* no rows returned */
			ret = 0;
			break;
		case SQLITE_ROW:
			if (sqlite3_column_type(stmt, 0) == SQLITE_NULL)
			{
				ret = 0;
				break;
			}
			ret = sqlite3_column_int(stmt, 0);
			break;
		default:
			DPRINTF(E_WARN, L_DB_SQL, "%s: step failed: %s\n", __func__, sqlite3_errmsg(db));
			ret = -1;
			break;
 	}

	sqlite3_finalize(stmt);
	return ret;
}