/*
 *  ReactOS Task Manager
 *
 *  priority.c
 *
 *  Copyright (C) 1999 - 2001  Brian Palmer  <brianp@reactos.org>
 *
 * This library 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 library 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
	
#define WIN32_LEAN_AND_MEAN	/* Exclude rarely-used stuff from Windows headers */
#include <windows.h>
#include <commctrl.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <tchar.h>
#include <stdio.h>
#include <winnt.h>
	
#include "taskmgr.h"
#include "priority.h"
#include "procpage.h"
#include "perfdata.h"

void ProcessPage_OnSetPriorityRealTime(void)
{
	LVITEM			lvitem;
	ULONG			Index;
	DWORD			dwProcessId;
	HANDLE			hProcess;
	TCHAR			strErrorText[260];

	for (Index=0; Index<(ULONG)ListView_GetItemCount(hProcessPageListCtrl); Index++)
	{
		memset(&lvitem, 0, sizeof(LVITEM));

		lvitem.mask = LVIF_STATE;
		lvitem.stateMask = LVIS_SELECTED;
		lvitem.iItem = Index;

		ListView_GetItem(hProcessPageListCtrl, &lvitem);

		if (lvitem.state & LVIS_SELECTED)
			break;
	}

	dwProcessId = PerfDataGetProcessId(Index);

	if ((ListView_GetSelectedCount(hProcessPageListCtrl) != 1) || (dwProcessId == 0))
		return;

	if (MessageBox(hMainWnd, _T("WARNING: Changing the priority class of this process may\ncause undesired results including system instability. Are you\nsure you want to change the priority class?"), _T("Task Manager Warning"), MB_YESNO|MB_ICONWARNING) != IDYES)
		return;

	hProcess = OpenProcess(PROCESS_SET_INFORMATION, FALSE, dwProcessId);

	if (!hProcess)
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
		return;
	}

	if (!SetPriorityClass(hProcess, REALTIME_PRIORITY_CLASS))
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
	}

	CloseHandle(hProcess);
}

void ProcessPage_OnSetPriorityHigh(void)
{
	LVITEM			lvitem;
	ULONG			Index;
	DWORD			dwProcessId;
	HANDLE			hProcess;
	TCHAR			strErrorText[260];

	for (Index=0; Index<(ULONG)ListView_GetItemCount(hProcessPageListCtrl); Index++)
	{
		memset(&lvitem, 0, sizeof(LVITEM));

		lvitem.mask = LVIF_STATE;
		lvitem.stateMask = LVIS_SELECTED;
		lvitem.iItem = Index;

		ListView_GetItem(hProcessPageListCtrl, &lvitem);

		if (lvitem.state & LVIS_SELECTED)
			break;
	}

	dwProcessId = PerfDataGetProcessId(Index);

	if ((ListView_GetSelectedCount(hProcessPageListCtrl) != 1) || (dwProcessId == 0))
		return;

	if (MessageBox(hMainWnd, _T("WARNING: Changing the priority class of this process may\ncause undesired results including system instability. Are you\nsure you want to change the priority class?"), _T("Task Manager Warning"), MB_YESNO|MB_ICONWARNING) != IDYES)
		return;

	hProcess = OpenProcess(PROCESS_SET_INFORMATION, FALSE, dwProcessId);

	if (!hProcess)
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
		return;
	}

	if (!SetPriorityClass(hProcess, HIGH_PRIORITY_CLASS))
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
	}

	CloseHandle(hProcess);
}

void ProcessPage_OnSetPriorityAboveNormal(void)
{
	LVITEM			lvitem;
	ULONG			Index;
	DWORD			dwProcessId;
	HANDLE			hProcess;
	TCHAR			strErrorText[260];

	for (Index=0; Index<(ULONG)ListView_GetItemCount(hProcessPageListCtrl); Index++)
	{
		memset(&lvitem, 0, sizeof(LVITEM));

		lvitem.mask = LVIF_STATE;
		lvitem.stateMask = LVIS_SELECTED;
		lvitem.iItem = Index;

		ListView_GetItem(hProcessPageListCtrl, &lvitem);

		if (lvitem.state & LVIS_SELECTED)
			break;
	}

	dwProcessId = PerfDataGetProcessId(Index);

	if ((ListView_GetSelectedCount(hProcessPageListCtrl) != 1) || (dwProcessId == 0))
		return;

	if (MessageBox(hMainWnd, _T("WARNING: Changing the priority class of this process may\ncause undesired results including system instability. Are you\nsure you want to change the priority class?"), _T("Task Manager Warning"), MB_YESNO|MB_ICONWARNING) != IDYES)
		return;

	hProcess = OpenProcess(PROCESS_SET_INFORMATION, FALSE, dwProcessId);

	if (!hProcess)
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
		return;
	}

	if (!SetPriorityClass(hProcess, ABOVE_NORMAL_PRIORITY_CLASS))
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
	}

	CloseHandle(hProcess);
}

void ProcessPage_OnSetPriorityNormal(void)
{
	LVITEM			lvitem;
	ULONG			Index;
	DWORD			dwProcessId;
	HANDLE			hProcess;
	TCHAR			strErrorText[260];

	for (Index=0; Index<(ULONG)ListView_GetItemCount(hProcessPageListCtrl); Index++)
	{
		memset(&lvitem, 0, sizeof(LVITEM));

		lvitem.mask = LVIF_STATE;
		lvitem.stateMask = LVIS_SELECTED;
		lvitem.iItem = Index;

		ListView_GetItem(hProcessPageListCtrl, &lvitem);

		if (lvitem.state & LVIS_SELECTED)
			break;
	}

	dwProcessId = PerfDataGetProcessId(Index);

	if ((ListView_GetSelectedCount(hProcessPageListCtrl) != 1) || (dwProcessId == 0))
		return;

	if (MessageBox(hMainWnd, _T("WARNING: Changing the priority class of this process may\ncause undesired results including system instability. Are you\nsure you want to change the priority class?"), _T("Task Manager Warning"), MB_YESNO|MB_ICONWARNING) != IDYES)
		return;

	hProcess = OpenProcess(PROCESS_SET_INFORMATION, FALSE, dwProcessId);

	if (!hProcess)
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
		return;
	}

	if (!SetPriorityClass(hProcess, NORMAL_PRIORITY_CLASS))
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
	}

	CloseHandle(hProcess);
}

void ProcessPage_OnSetPriorityBelowNormal(void)
{
	LVITEM			lvitem;
	ULONG			Index;
	DWORD			dwProcessId;
	HANDLE			hProcess;
	TCHAR			strErrorText[260];

	for (Index=0; Index<(ULONG)ListView_GetItemCount(hProcessPageListCtrl); Index++)
	{
		memset(&lvitem, 0, sizeof(LVITEM));

		lvitem.mask = LVIF_STATE;
		lvitem.stateMask = LVIS_SELECTED;
		lvitem.iItem = Index;

		ListView_GetItem(hProcessPageListCtrl, &lvitem);

		if (lvitem.state & LVIS_SELECTED)
			break;
	}

	dwProcessId = PerfDataGetProcessId(Index);

	if ((ListView_GetSelectedCount(hProcessPageListCtrl) != 1) || (dwProcessId == 0))
		return;

	if (MessageBox(hMainWnd, _T("WARNING: Changing the priority class of this process may\ncause undesired results including system instability. Are you\nsure you want to change the priority class?"), _T("Task Manager Warning"), MB_YESNO|MB_ICONWARNING) != IDYES)
		return;

	hProcess = OpenProcess(PROCESS_SET_INFORMATION, FALSE, dwProcessId);

	if (!hProcess)
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
		return;
	}

	if (!SetPriorityClass(hProcess, BELOW_NORMAL_PRIORITY_CLASS))
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
	}

	CloseHandle(hProcess);
}

void ProcessPage_OnSetPriorityLow(void)
{
	LVITEM			lvitem;
	ULONG			Index;
	DWORD			dwProcessId;
	HANDLE			hProcess;
	TCHAR			strErrorText[260];

	for (Index=0; Index<(ULONG)ListView_GetItemCount(hProcessPageListCtrl); Index++)
	{
		memset(&lvitem, 0, sizeof(LVITEM));

		lvitem.mask = LVIF_STATE;
		lvitem.stateMask = LVIS_SELECTED;
		lvitem.iItem = Index;

		ListView_GetItem(hProcessPageListCtrl, &lvitem);

		if (lvitem.state & LVIS_SELECTED)
			break;
	}

	dwProcessId = PerfDataGetProcessId(Index);

	if ((ListView_GetSelectedCount(hProcessPageListCtrl) != 1) || (dwProcessId == 0))
		return;

	if (MessageBox(hMainWnd, _T("WARNING: Changing the priority class of this process may\ncause undesired results including system instability. Are you\nsure you want to change the priority class?"), _T("Task Manager Warning"), MB_YESNO|MB_ICONWARNING) != IDYES)
		return;

	hProcess = OpenProcess(PROCESS_SET_INFORMATION, FALSE, dwProcessId);

	if (!hProcess)
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
		return;
	}

	if (!SetPriorityClass(hProcess, IDLE_PRIORITY_CLASS))
	{
		GetLastErrorText(strErrorText, 260);
		MessageBox(hMainWnd, strErrorText, _T("Unable to Change Priority"), MB_OK|MB_ICONSTOP);
	}

	CloseHandle(hProcess);
}