/*
 *  ReactOS Task Manager
 *
 *  graph.cpp
 *
 *  Copyright (C) 1999 - 2001  Brian Palmer  <brianp@reactos.org>
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
	
#include "stdafx.h"
#include "taskmgr.h"
#include "graph.h"
#include "font.h"
#include "perfdata.h"


LONG				OldGraphWndProc;

void				Graph_DrawCpuUsageGraph(HDC hDC, HWND hWnd);
void				Graph_DrawMemUsageGraph(HDC hDC, HWND hWnd);
void				Graph_DrawMemUsageHistoryGraph(HDC hDC, HWND hWnd);

LRESULT CALLBACK Graph_WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	HDC				hdc;
	PAINTSTRUCT		ps;
	LONG			WindowId;
	
	switch (message)
	{
	case WM_ERASEBKGND:

		return TRUE;

	//
	// Filter out mouse  & keyboard messages
	//
	//case WM_APPCOMMAND:
	case WM_CAPTURECHANGED:
	case WM_LBUTTONDBLCLK:
	case WM_LBUTTONDOWN:
	case WM_LBUTTONUP:
	case WM_MBUTTONDBLCLK:
	case WM_MBUTTONDOWN:
	case WM_MBUTTONUP:
	case WM_MOUSEACTIVATE:
	case WM_MOUSEHOVER:
	case WM_MOUSELEAVE:
	case WM_MOUSEMOVE:
	//case WM_MOUSEWHEEL:
	case WM_NCHITTEST:
	case WM_NCLBUTTONDBLCLK:
	case WM_NCLBUTTONDOWN:
	case WM_NCLBUTTONUP:
	case WM_NCMBUTTONDBLCLK:
	case WM_NCMBUTTONDOWN:
	case WM_NCMBUTTONUP:
	//case WM_NCMOUSEHOVER:
	//case WM_NCMOUSELEAVE:
	case WM_NCMOUSEMOVE:
	case WM_NCRBUTTONDBLCLK:
	case WM_NCRBUTTONDOWN:
	case WM_NCRBUTTONUP:
	//case WM_NCXBUTTONDBLCLK:
	//case WM_NCXBUTTONDOWN:
	//case WM_NCXBUTTONUP:
	case WM_RBUTTONDBLCLK:
	case WM_RBUTTONDOWN:
	case WM_RBUTTONUP:
	//case WM_XBUTTONDBLCLK:
	//case WM_XBUTTONDOWN:
	//case WM_XBUTTONUP:
	case WM_ACTIVATE:
	case WM_CHAR:
	case WM_DEADCHAR:
	case WM_GETHOTKEY:
	case WM_HOTKEY:
	case WM_KEYDOWN:
	case WM_KEYUP:
	case WM_KILLFOCUS:
	case WM_SETFOCUS:
	case WM_SETHOTKEY:
	case WM_SYSCHAR:
	case WM_SYSDEADCHAR:
	case WM_SYSKEYDOWN:
	case WM_SYSKEYUP:
			
		return 0;

	case WM_PAINT:
		
		hdc = BeginPaint(hWnd, &ps);

		WindowId = GetWindowLong(hWnd, GWL_ID);

		switch (WindowId)
		{
		case IDC_CPU_USAGE_GRAPH:
			Graph_DrawCpuUsageGraph(hdc, hWnd);
			break;
		case IDC_MEM_USAGE_GRAPH:
			Graph_DrawMemUsageGraph(hdc, hWnd);
			break;
		case IDC_MEM_USAGE_HISTORY_GRAPH:
			Graph_DrawMemUsageHistoryGraph(hdc, hWnd);
			break;
		}
		
		EndPaint(hWnd, &ps);
		
		return 0;
		
	}
	
	//
	// We pass on all non-handled messages
	//
	return CallWindowProc((WNDPROC)OldGraphWndProc, hWnd, message, wParam, lParam);
}

void Graph_DrawCpuUsageGraph(HDC hDC, HWND hWnd)
{
	RECT			rcClient;
	RECT			rcBarLeft;
	RECT			rcBarRight;
	TCHAR			Text[260];
	ULONG			CpuUsage;
	ULONG			CpuKernelUsage;
	int				nBars;
	int				nBarsUsed; // Bottom bars that are "used", i.e. are bright green, representing used cpu time
	int				nBarsUsedKernel; // Bottom bars that are "used", i.e. are bright green, representing used cpu kernel time
	int				nBarsFree; // Top bars that are "unused", i.e. are dark green, representing free cpu time
	int				i;
	
	//
	// Get the client area rectangle
	//
	GetClientRect(hWnd, &rcClient);
	
	//
	// Fill it with blackness
	//
	FillSolidRect(hDC, &rcClient, RGB(0, 0, 0));
	
	//
	// Get the CPU usage
	//
	CpuUsage = PerfDataGetProcessorUsage();
	CpuKernelUsage = PerfDataGetProcessorSystemUsage();
	
	//
	// Check and see how many digits it will take
	// so we get the indentation right every time.
	//
	if (CpuUsage == 100)
	{
		sprintf(Text, "%d%%", CpuUsage);
	}
	else if (CpuUsage < 10)
	{
		sprintf(Text, "  %d%%", CpuUsage);
	}
	else
	{
		sprintf(Text, " %d%%", CpuUsage);
	}
	
	//
	// Draw the font text onto the graph
	// The bottom 20 pixels are reserved for the text
	//
	Font_DrawText(hDC, Text, ((rcClient.right - rcClient.left) - 32) / 2, rcClient.bottom - 11 - 5);

	//
	// Now we have to draw the graph
	// So first find out how many bars we can fit
	//
	nBars = ((rcClient.bottom - rcClient.top) - 25) / 3;
	nBarsUsed = (nBars * CpuUsage) / 100;
	if ((CpuUsage) && (nBarsUsed == 0))
	{
		nBarsUsed = 1;
	}
	nBarsFree = nBars - nBarsUsed;
	if (TaskManagerSettings.ShowKernelTimes)
	{
		nBarsUsedKernel = ((nBars * 2) * CpuKernelUsage) / 100;
		nBarsUsed -= (nBarsUsedKernel / 2);
	}
	else
	{
		nBarsUsedKernel = 0;
	}

	//
	// Now draw the bar graph
	//
	rcBarLeft.left =  ((rcClient.right - rcClient.left) - 33) / 2;
	rcBarLeft.right =  rcBarLeft.left + 16;
	rcBarRight.left = rcBarLeft.left + 17;
	rcBarRight.right = rcBarLeft.right + 17;
	rcBarLeft.top = rcBarRight.top = 5;
	rcBarLeft.bottom = rcBarRight.bottom = 7;
	
	//
	// Draw the "free" bars
	//
	for (i=0; i<nBarsFree; i++)
	{
		FillSolidRect(hDC, &rcBarLeft, DARK_GREEN);
		FillSolidRect(hDC, &rcBarRight, DARK_GREEN);
		
		rcBarLeft.top += 3;
		rcBarLeft.bottom += 3;
		
		rcBarRight.top += 3;
		rcBarRight.bottom += 3;
	}
	
	//
	// Draw the "used" bars
	//
	for (i=0; i<nBarsUsed; i++)
	{
		FillSolidRect(hDC, &rcBarLeft, BRIGHT_GREEN);
		FillSolidRect(hDC, &rcBarRight, BRIGHT_GREEN);
		
		rcBarLeft.top += 3;
		rcBarLeft.bottom += 3;
		
		rcBarRight.top += 3;
		rcBarRight.bottom += 3;
	}
	
	//
	// Draw the "used" kernel bars
	//
	rcBarLeft.bottom--;
	rcBarRight.bottom--;
	if (nBarsUsedKernel % 2)
	{
		rcBarLeft.top -= 2;
		rcBarLeft.bottom -= 2;
		
		rcBarRight.top -= 2;
		rcBarRight.bottom -= 2;

		FillSolidRect(hDC, &rcBarLeft, RED);
		FillSolidRect(hDC, &rcBarRight, RED);
		
		rcBarLeft.top += 2;
		rcBarLeft.bottom += 2;
		
		rcBarRight.top += 2;
		rcBarRight.bottom += 2;

		nBarsUsedKernel--;
	}
	for (i=0; i<nBarsUsedKernel; i++)
	{
		FillSolidRect(hDC, &rcBarLeft, RED);
		FillSolidRect(hDC, &rcBarRight, RED);
		
		rcBarLeft.top++;
		rcBarLeft.bottom++;
		
		rcBarRight.top++;
		rcBarRight.bottom++;

		if (i % 2)
		{
			rcBarLeft.top++;
			rcBarLeft.bottom++;
			
			rcBarRight.top++;
			rcBarRight.bottom++;
		}
	}
}

void Graph_DrawMemUsageGraph(HDC hDC, HWND hWnd)
{
	RECT			rcClient;
	RECT			rcBarLeft;
	RECT			rcBarRight;
	TCHAR			Text[260];
	ULONGLONG		CommitChargeTotal;
	ULONGLONG		CommitChargeLimit;
	int				nBars;
	int				nBarsUsed; // Bottom bars that are "used", i.e. are bright green, representing used memory
	int				nBarsFree; // Top bars that are "unused", i.e. are dark green, representing free memory
	int				i;
	
	//
	// Get the client area rectangle
	//
	GetClientRect(hWnd, &rcClient);
	
	//
	// Fill it with blackness
	//
	FillSolidRect(hDC, &rcClient, RGB(0, 0, 0));
	
	//
	// Get the memory usage
	//
	CommitChargeTotal = (ULONGLONG)PerfDataGetCommitChargeTotalK();
	CommitChargeLimit = (ULONGLONG)PerfDataGetCommitChargeLimitK();

	sprintf(Text, "%dK", CommitChargeTotal);
	
	//
	// Draw the font text onto the graph
	// The bottom 20 pixels are reserved for the text
	//
	Font_DrawText(hDC, Text, ((rcClient.right - rcClient.left) - (strlen(Text) * 8)) / 2, rcClient.bottom - 11 - 5);

	//
	// Now we have to draw the graph
	// So first find out how many bars we can fit
	//
	nBars = ((rcClient.bottom - rcClient.top) - 25) / 3;
	nBarsUsed = (nBars * (int)((CommitChargeTotal * 100) / CommitChargeLimit)) / 100;
	nBarsFree = nBars - nBarsUsed;

	//
	// Now draw the bar graph
	//
	rcBarLeft.left =  ((rcClient.right - rcClient.left) - 33) / 2;
	rcBarLeft.right =  rcBarLeft.left + 16;
	rcBarRight.left = rcBarLeft.left + 17;
	rcBarRight.right = rcBarLeft.right + 17;
	rcBarLeft.top = rcBarRight.top = 5;
	rcBarLeft.bottom = rcBarRight.bottom = 7;
	
	//
	// Draw the "free" bars
	//
	for (i=0; i<nBarsFree; i++)
	{
		FillSolidRect(hDC, &rcBarLeft, DARK_GREEN);
		FillSolidRect(hDC, &rcBarRight, DARK_GREEN);
		
		rcBarLeft.top += 3;
		rcBarLeft.bottom += 3;
		
		rcBarRight.top += 3;
		rcBarRight.bottom += 3;
	}
	
	//
	// Draw the "used" bars
	//
	for (i=0; i<nBarsUsed; i++)
	{
		FillSolidRect(hDC, &rcBarLeft, BRIGHT_GREEN);
		FillSolidRect(hDC, &rcBarRight, BRIGHT_GREEN);
		
		rcBarLeft.top += 3;
		rcBarLeft.bottom += 3;
		
		rcBarRight.top += 3;
		rcBarRight.bottom += 3;
	}
}

void Graph_DrawMemUsageHistoryGraph(HDC hDC, HWND hWnd)
{
	RECT			rcClient;
	ULONGLONG		CommitChargeLimit;
	int				i;
	static int		offset = 0;
	
	if (offset++ >= 10)
		offset = 0;
	
	//
	// Get the client area rectangle
	//
	GetClientRect(hWnd, &rcClient);
	
	//
	// Fill it with blackness
	//
	FillSolidRect(hDC, &rcClient, RGB(0, 0, 0));
	
	//
	// Get the memory usage
	//
	CommitChargeLimit = (ULONGLONG)PerfDataGetCommitChargeLimitK();

	//
	// Draw the graph background
	//
	// Draw the horizontal bars
	//
	for (i=0; i<rcClient.bottom; i++)
	{
		if ((i % 11) == 0)
		{
			FillSolidRect(hDC, 0, i, rcClient.right, 1, DARK_GREEN);
		}
	}
	//
	// Draw the vertical bars
	//
	for (i=11; i<rcClient.right + offset; i++)
	{
		if ((i % 11) == 0)
		{
			FillSolidRect(hDC, i - offset, 0, 1, rcClient.bottom, DARK_GREEN);
		}
	}

	//
	// Draw the memory usage
	//
	for (i=rcClient.right; i>=0; i--)
	{
	}
}