/*
** Zabbix
** Copyright (C) 2001-2018 Zabbix SIA
**
** 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**/

#include "common.h"
#include "sysinfo.h"
#include "stats.h"

int	SYSTEM_CPU_NUM(AGENT_REQUEST *request, AGENT_RESULT *result)
{
#ifdef HAVE_LIBPERFSTAT
	char			*tmp;
	perfstat_cpu_total_t	ps_cpu_total;

	if (1 < request->nparam)
		return SYSINFO_RET_FAIL;

	tmp = get_rparam(request, 0);

	/* only "online" (default) for parameter "type" is supported */
	if (NULL != tmp && '\0' != *tmp && 0 != strcmp(tmp, "online"))
		return SYSINFO_RET_FAIL;

	if (-1 == perfstat_cpu_total(NULL, &ps_cpu_total, sizeof(ps_cpu_total), 1))
		return SYSINFO_RET_FAIL;

	SET_UI64_RESULT(result, ps_cpu_total.ncpus);

	return SYSINFO_RET_OK;
#else
	return SYSINFO_RET_FAIL;
#endif
}

int	SYSTEM_CPU_UTIL(AGENT_REQUEST *request, AGENT_RESULT *result)
{
	char	*tmp;
	int	cpu_num, state, mode;

	if (3 < request->nparam)
		return SYSINFO_RET_FAIL;

	tmp = get_rparam(request, 0);

	if (NULL == tmp || '\0' == *tmp || 0 == strcmp(tmp, "all"))
		cpu_num = 0;
	else if (SUCCEED != is_uint31_1(tmp, &cpu_num))
		return SYSINFO_RET_FAIL;
	else
		cpu_num++;

	tmp = get_rparam(request, 1);

	if (NULL == tmp || '\0' == *tmp || 0 == strcmp(tmp, "user"))
		state = ZBX_CPU_STATE_USER;
	else if (0 == strcmp(tmp, "system"))
		state = ZBX_CPU_STATE_SYSTEM;
	else if (0 == strcmp(tmp, "idle"))
		state = ZBX_CPU_STATE_IDLE;
	else if (0 == strcmp(tmp, "iowait"))
		state = ZBX_CPU_STATE_IOWAIT;
	else
		return SYSINFO_RET_FAIL;

	tmp = get_rparam(request, 2);

	if (NULL == tmp || '\0' == *tmp || 0 == strcmp(tmp, "avg1"))
		mode = ZBX_AVG1;
	else if (0 == strcmp(tmp, "avg5"))
		mode = ZBX_AVG5;
	else if (0 == strcmp(tmp, "avg15"))
		mode = ZBX_AVG15;
	else
		return SYSINFO_RET_FAIL;

	return get_cpustat(result, cpu_num, state, mode);
}

int	SYSTEM_CPU_LOAD(AGENT_REQUEST *request, AGENT_RESULT *result)
{
#ifdef HAVE_LIBPERFSTAT
#if !defined(SBITS)
#	define SBITS 16
#endif
	char			*tmp;
	int			mode, per_cpu = 1;
	perfstat_cpu_total_t	ps_cpu_total;
	double			value;

	if (2 < request->nparam)
		return SYSINFO_RET_FAIL;

	tmp = get_rparam(request, 0);

	if (NULL == tmp || '\0' == *tmp || 0 == strcmp(tmp, "all"))
		per_cpu = 0;
	else if (0 != strcmp(tmp, "percpu"))
		return SYSINFO_RET_FAIL;

	tmp = get_rparam(request, 1);

	if (NULL == tmp || '\0' == *tmp || 0 == strcmp(tmp, "avg1"))
		mode = ZBX_AVG1;
	else if (0 == strcmp(tmp, "avg5"))
		mode = ZBX_AVG5;
	else if (0 == strcmp(tmp, "avg15"))
		mode = ZBX_AVG15;
	else
		return SYSINFO_RET_FAIL;

	if (-1 == perfstat_cpu_total(NULL, &ps_cpu_total, sizeof(ps_cpu_total), 1))
		return SYSINFO_RET_FAIL;

	value = (double)ps_cpu_total.loadavg[mode] / (1 << SBITS);

	if (1 == per_cpu)
	{
		if (0 >= ps_cpu_total.ncpus)
			return SYSINFO_RET_FAIL;
		value /= ps_cpu_total.ncpus;
	}

	SET_DBL_RESULT(result, value);

	return SYSINFO_RET_OK;
#else
	return SYSINFO_RET_FAIL;
#endif
}

int     SYSTEM_CPU_SWITCHES(AGENT_REQUEST *request, AGENT_RESULT *result)
{
#ifdef HAVE_LIBPERFSTAT
	perfstat_cpu_total_t	ps_cpu_total;

	if (-1 == perfstat_cpu_total(NULL, &ps_cpu_total, sizeof(ps_cpu_total), 1))
		return SYSINFO_RET_FAIL;

	SET_UI64_RESULT(result, (zbx_uint64_t)ps_cpu_total.pswitch);

	return SYSINFO_RET_OK;
#else
	return SYSINFO_RET_FAIL;
#endif
}

int     SYSTEM_CPU_INTR(AGENT_REQUEST *request, AGENT_RESULT *result)
{
#ifdef HAVE_LIBPERFSTAT
	perfstat_cpu_total_t	ps_cpu_total;

	if (-1 == perfstat_cpu_total(NULL, &ps_cpu_total, sizeof(ps_cpu_total), 1))
		return SYSINFO_RET_FAIL;

	SET_UI64_RESULT(result, (zbx_uint64_t)ps_cpu_total.devintrs);

	return SYSINFO_RET_OK;
#else
	return SYSINFO_RET_FAIL;
#endif
}
