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/*
Copyright (C) 2001 Kimmo Pekkola

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 "StdAfx.h"
#include "MeasureCPU.h"
#include "Rainmeter.h"
#include "System.h"
#include "Error.h"

#define STATUS_SUCCESS 0
#define STATUS_INFO_LENGTH_MISMATCH 0xC0000004

#define SystemProcessorPerformanceInformation 8

typedef struct _SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION {
    LARGE_INTEGER IdleTime;
    LARGE_INTEGER KernelTime;
    LARGE_INTEGER UserTime;
    LARGE_INTEGER Reserved1[2];
    ULONG Reserved2;
} SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION, *PSYSTEM_PROCESSOR_PERFORMANCE_INFORMATION;

#define Li2Double(x) ((double)((x).QuadPart))
#define Ft2Double(x) ((double)((x).dwHighDateTime) * 4.294967296E9 + (double)((x).dwLowDateTime))

PROCNTQSI CMeasureCPU::c_NtQuerySystemInformation = NULL;
int CMeasureCPU::c_NumOfProcessors = 0;
ULONG CMeasureCPU::c_BufferSize = 0;

// ntdll!NtQuerySystemInformation (NT specific!)
//
// The function copies the system information of the
// specified type into a buffer
//
// NTSYSAPI
// NTSTATUS
// NTAPI
// NtQuerySystemInformation(
// IN UINT SystemInformationClass, // information type
// OUT PVOID SystemInformation, // pointer to buffer
// IN ULONG SystemInformationLength, // buffer size in bytes
// OUT PULONG ReturnLength OPTIONAL // pointer to a 32-bit
// // variable that receives
// // the number of bytes
// // written to the buffer
// );

/*
** The constructor
**
*/
CMeasureCPU::CMeasureCPU(CMeterWindow* meterWindow, const WCHAR* name) : CMeasure(meterWindow, name),
m_Processor(),
m_OldTime()
{
m_MaxValue = 100.0;

if (c_NtQuerySystemInformation == NULL)
{
c_NtQuerySystemInformation = (PROCNTQSI)GetProcAddress(GetModuleHandle(L"ntdll"), "NtQuerySystemInformation");
}
if (c_NumOfProcessors == 0)
{
SYSTEM_INFO systemInfo;
GetSystemInfo(&systemInfo);
c_NumOfProcessors = (int)systemInfo.dwNumberOfProcessors;
}
}

/*
** The destructor
**
*/
CMeasureCPU::~CMeasureCPU()
{
}

/*
** Read the options specified in the ini file.
**
*/
void CMeasureCPU::ReadOptions(CConfigParser& parser, const WCHAR* section)
{
CMeasure::ReadOptions(parser, section);

int processor = parser.ReadInt(section, L"Processor", 0);

if (processor < 0 || processor > c_NumOfProcessors)
{
LogWithArgs(LOG_WARNING, L"CPU: Processor=%i invalid in [%s]", processor, section);
processor = 0;
}

if (processor != m_Processor)
{
m_Processor = processor;
m_OldTime[0] = m_OldTime[1] = 0.0;
}
}

/*
** Updates the current CPU utilization value.
**
*/
void CMeasureCPU::UpdateValue()
{
if (m_Processor == 0)
{
BOOL status;
FILETIME ftIdleTime, ftKernelTime, ftUserTime;

// get new CPU's idle/kernel/user time
status = GetSystemTimes(&ftIdleTime, &ftKernelTime, &ftUserTime);
if (status == 0) return;

CalcUsage(Ft2Double(ftIdleTime),
Ft2Double(ftKernelTime) + Ft2Double(ftUserTime));
}
else if (c_NtQuerySystemInformation)
{
LONG status;
ULONG bufSize = c_BufferSize;
BYTE* buf = (bufSize > 0) ? new BYTE[bufSize] : NULL;

int loop = 0;

do
{
ULONG size = 0;

status = c_NtQuerySystemInformation(SystemProcessorPerformanceInformation, buf, bufSize, &size);
if (status == STATUS_INFO_LENGTH_MISMATCH)
{
if (size == 0) // Returned required buffer size is always 0 on Windows 2000/XP.
{
if (bufSize == 0)
{
bufSize = sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION) * c_NumOfProcessors;
}
else
{
bufSize += sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION);
}
}
else
{
if (size != bufSize)
{
bufSize = size;
}
else // ??
{
bufSize += sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION);
}
}

delete [] buf;
buf = new BYTE[bufSize];
}
else
{
break;
}

++loop;
}
while (loop < 5);

if (status == STATUS_SUCCESS)
{
if (bufSize != c_BufferSize)
{
// Store the new buffer size
c_BufferSize = bufSize;
}

SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION* systemPerfInfo = (SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION*)buf;

int processor = m_Processor - 1;

CalcUsage(Li2Double(systemPerfInfo[processor].IdleTime),
Li2Double(systemPerfInfo[processor].KernelTime) + Li2Double(systemPerfInfo[processor].UserTime));
}

delete [] buf;
}
}

/*
** Calculates the current CPU utilization value.
**
*/
void CMeasureCPU::CalcUsage(double idleTime, double systemTime)
{
// CurrentCpuUsage% = 100 - ((IdleTime / SystemTime) * 100)
double dbCpuUsage = 100.0 - ((idleTime - m_OldTime[0]) / (systemTime - m_OldTime[1])) * 100.0;

dbCpuUsage = min(dbCpuUsage, 100.0);
m_Value = max(dbCpuUsage, 0.0);

// store new CPU's idle and system time
m_OldTime[0] = idleTime;
m_OldTime[1] = systemTime;
}
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