/* ibm1130_gui.c: IBM 1130 CPU simulator Console Display
 *
 *  Based on the SIMH package written by Robert M Supnik
 *
 * (C) Copyright 2002, Brian Knittel.
 * You may freely use this program, but: it offered strictly on an AS-IS, AT YOUR OWN
 * RISK basis, there is no warranty of fitness for any purpose, and the rest of the
 * usual yada-yada. Please keep this notice and the copyright in any distributions
 * or modifications.
 *
 * This is not a supported product, but I welcome bug reports and fixes.
 * Mail to sim@ibm1130.org
 *
 * 17-May-02 BLK	Pulled out of ibm1130_cpu.c
 */

/* ------------------------------------------------------------------------
 * Definitions
 * ------------------------------------------------------------------------ */

#include <stdarg.h>
#include <math.h>

#include "ibm1130_defs.h"
#include "ibm1130res.h"

#define UPDATE_BY_TIMER

#ifdef UPDATE_BY_TIMER
#  define UPDATE_INTERVAL	20				// set to desired number of updates/second
#else
#  define UPDATE_INTERVAL	5000 			// GUI: set to 100000/f where f = desired updates/second of 1130 time
#endif

/* ------------------------------------------------------------------------
 * Function declarations
 * ------------------------------------------------------------------------ */

t_stat console_reset (DEVICE *dptr);

/* ------------------------------------------------------------------------ 
 * Console display - on Windows builds (only) this code displays the 1130 console
 * and toggle switches. It really enhances the experience.
 *
 * Currently, when the IPS throttle is nonzero, I update the display after every
 * UPDATE_INTERVAL instructions, plus or minus a random amount to avoid aliased
 * sampling in loops.  When UPDATE_INTERVAL is defined as zero, we update every
 * instruction no matter what the throttle. This makes the simulator too slow
 * but it's cool and helpful during development.
 * ------------------------------------------------------------------------ */

#define UNIT_V_DISPLAY   (UNIT_V_UF + 0)
#define UNIT_DISPLAY	 (1u << UNIT_V_DISPLAY)

MTAB console_mod[] = {
	{ UNIT_DISPLAY, 0,            "off", "OFF", NULL },
	{ UNIT_DISPLAY, UNIT_DISPLAY, "on",  "ON",  NULL },
	{ 0 }
};

UNIT console_unit = {UDATA (NULL, UNIT_DISABLE|UNIT_DISPLAY, 0) };

DEVICE console_dev = {
	"GUI", &console_unit, NULL, console_mod,
	1, 16, 16, 1, 16, 16,
	NULL, NULL, console_reset,
	NULL, NULL, NULL
};

// reset for the "console" display device 

extern char *read_line (char *cptr, int size, FILE *stream);
extern FILE *sim_log;

#ifndef GUI_SUPPORT
	void update_gui (int force)				  {}		/* stubs for non-GUI builds */
	void forms_check (int set)				  {}
	void print_check (int set)				  {}
	void keyboard_select (int select)		  {}
	void keyboard_selected (int select) 	  {}
	void disk_ready (int ready)         	  {}
	void disk_unlocked (int unlocked)   	  {}
	void gui_run (int running)          	  {} 
	static void init_console_window (void) 	  {}
	static void destroy_console_window (void) {}

	t_stat console_reset (DEVICE *dptr)		  {return SCPE_OK;}
	void stuff_cmd (char *cmd) 				  {}
	char *read_cmdline (char *ptr, int size, FILE *stream)  {return read_line(ptr, size, stream);}
	void remark_cmd (char *remark)			  {printf("%s\n", remark); if (sim_log) fprintf(sim_log, "%s\n", remark);}
#else

t_stat console_reset (DEVICE *dptr)
{
	if (! sim_gui) {
		SETBIT(console_unit.flags, UNIT_DIS);			// disable the GUI
		CLRBIT(console_unit.flags, UNIT_DISPLAY);		// turn the GUI off
	}

	update_gui(FALSE);
	return SCPE_OK;
}

/* scp_panic - report fatal internal programming error */

void scp_panic (char *msg)
{
	fprintf(stderr, "%s\n", msg);
	exit(1);
}

#ifdef WIN32
	/* only WIN32 is defined right now */

#include <windows.h>

#define BUTTON_WIDTH  90
#define BUTTON_HEIGHT 50

#define IDC_KEYBOARD_SELECT		0
#define IDC_DISK_UNLOCK			1
#define IDC_RUN					2
#define IDC_PARITY_CHECK		3
#define IDC_UNUSED				4
#define IDC_FILE_READY			5
#define IDC_FORMS_CHECK			6
#define IDC_POWER_ON			7
#define IDC_POWER				8
#define IDC_PROGRAM_START		9
#define IDC_PROGRAM_STOP		10
#define IDC_LOAD_IAR			11
#define IDC_KEYBOARD			12
#define IDC_IMM_STOP			13
#define IDC_RESET				14
#define IDC_PROGRAM_LOAD		15

#define LAMPTIME        500			// 500 msec delay on updating
#define FLASH_TIMER_ID    1
#define UPDATE_TIMER_ID   2

static BOOL   class_defined = FALSE;
static HWND   hConsoleWnd = NULL;
static HBITMAP hBitmap = NULL;
static HFONT  hFont = NULL;
static HFONT  hBtnFont = NULL;
static HBRUSH hbLampOut = NULL;
static HBRUSH hbWhite = NULL;
static HBRUSH hbBlack = NULL;
static HBRUSH hbGray  = NULL;
static HPEN   hSwitchPen = NULL;
static HPEN   hWhitePen  = NULL;
static HPEN   hBlackPen  = NULL;
static HPEN   hLtGreyPen = NULL;
static HPEN   hGreyPen   = NULL;
static HPEN   hDkGreyPen = NULL;
static int    hUpdateTimer = 0;
static int    hFlashTimer  = 0;

static HCURSOR hcArrow = NULL;
static HCURSOR hcHand  = NULL;
static HINSTANCE hInstance;
static HDC hCDC = NULL;
static char szConsoleClassName[] = "1130CONSOLE";
static DWORD PumpID = 0;
static HANDLE hPump = INVALID_HANDLE_VALUE;
static int bmwid, bmht;

static struct tag_btn {
	int x, y;
	char *txt;
	BOOL pushable;
	COLORREF clr;
	HBRUSH hbrLit, hbrDark;
	HWND   hBtn;
} btn[] = {
	0, 0,	"KEYBOARD\nSELECT",		FALSE,	RGB(255,255,180),	NULL, NULL, NULL, 
	0, 1,	"DISK\nUNLOCK",			FALSE, 	RGB(255,255,180),	NULL, NULL, NULL, 
	0, 2, 	"RUN",					FALSE,	RGB(0,255,0),		NULL, NULL, NULL, 
	0, 3,	"PARITY\nCHECK",		FALSE,	RGB(255,0,0),		NULL, NULL, NULL, 

	1, 0,	"",						FALSE, 	RGB(255,255,180),	NULL, NULL, NULL, 
	1, 1,	"FILE\nREADY",			FALSE, 	RGB(0,255,0),		NULL, NULL, NULL, 
	1, 2,	"FORMS\nCHECK",			FALSE, 	RGB(255,255,0),		NULL, NULL, NULL, 
	1, 3,	"POWER\nON",			FALSE, 	RGB(255,255,180),	NULL, NULL, NULL, 

	2, 0,	"POWER",				TRUE,	RGB(255,255,180), 	NULL, NULL, NULL, 
	2, 1,	"PROGRAM\nSTART",		TRUE,	RGB(0,255,0),		NULL, NULL, NULL, 
	2, 2,	"PROGRAM\nSTOP",		TRUE,	RGB(255,0,0),		NULL, NULL, NULL, 
	2, 3,	"LOAD\nIAR",			TRUE,	RGB(0,0,255),		NULL, NULL, NULL, 

	3, 0,	"KEYBOARD",				TRUE, 	RGB(255,255,180),	NULL, NULL, NULL, 
	3, 1,	"IMM\nSTOP",			TRUE, 	RGB(255,0,0),		NULL, NULL, NULL, 
	3, 2,	"CHECK\nRESET",			TRUE, 	RGB(0,0,255),		NULL, NULL, NULL, 
	3, 3,	"PROGRAM\nLOAD",		TRUE, 	RGB(0,0,255),		NULL, NULL, NULL, 
};
#define NBUTTONS (sizeof(btn) / sizeof(btn[0]))

static void init_console_window (void);
static void destroy_console_window (void);
LRESULT CALLBACK ConsoleWndProc (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
static DWORD WINAPI Pump (LPVOID arg);

#define NIXOBJECT(hObj) if (hObj != NULL) {DeleteObject(hObj); hObj = NULL;}

/* ------------------------------------------------------------------------ 
 * init_console_window - display the 1130 console. Actually just creates a thread 
 * to run the Pump routine which does the actual work.
 * ------------------------------------------------------------------------ */

static void init_console_window (void)
{
	static BOOL did_atexit = FALSE;

	if (hConsoleWnd != NULL)
		return;

	if (PumpID == 0)
		hPump = CreateThread(NULL, 0, Pump, 0, 0, &PumpID);

	if (! did_atexit) {
		atexit(destroy_console_window);
		did_atexit = TRUE;
	}
}

/* ------------------------------------------------------------------------ 
 * destroy_console_window - delete GDI objects.
 * ------------------------------------------------------------------------ */

static void destroy_console_window (void)
{
	int i;

	if (hConsoleWnd != NULL)
		SendMessage(hConsoleWnd, WM_CLOSE, 0, 0);	// cross thread call is OK

	if (hPump != INVALID_HANDLE_VALUE) {			// this is not the most graceful way to do it
		TerminateThread(hPump, 0);
		hPump  = INVALID_HANDLE_VALUE;
		PumpID = 0;
		hConsoleWnd = NULL;
	}
	if (hCDC != NULL) {
		DeleteDC(hCDC);
		hCDC = NULL;
	}

	NIXOBJECT(hBitmap)
	NIXOBJECT(hbLampOut)
	NIXOBJECT(hFont)
	NIXOBJECT(hBtnFont);
	NIXOBJECT(hcHand)
	NIXOBJECT(hSwitchPen)
	NIXOBJECT(hLtGreyPen)
	NIXOBJECT(hGreyPen)
	NIXOBJECT(hDkGreyPen)

	for (i = 0; i < NBUTTONS; i++) {
		NIXOBJECT(btn[i].hbrLit);
		NIXOBJECT(btn[i].hbrDark);
	}

//	if (class_defined) {
//		UnregisterClass(hInstance, szConsoleClassName);
//		class_defined = FALSE;
//	}
}

/* ------------------------------------------------------------------------ 
 * these variables hold the displayed versions of the system registers 
 * ------------------------------------------------------------------------ */

static int shown_iar = 0, shown_sar = 0, shown_sbr = 0, shown_afr = 0, shown_acc = 0, shown_ext  = 0;
static int shown_op  = 0, shown_tag = 0, shown_irq = 0, shown_ccc = 0, shown_cnd = 0, shown_wait = 0;
static int shown_ces = 0, shown_runmode = MODE_RUN;
static int CND;

/* ------------------------------------------------------------------------ 
 * RedrawRegion - mark a region for redrawing without background erase
 * ------------------------------------------------------------------------ */

static void RedrawRegion (HWND hWnd, int left, int top, int right, int bottom)
{
	RECT r;

	r.left   = left;
	r.top    = top;
	r.right  = right;
	r.bottom = bottom;

	InvalidateRect(hWnd, &r, FALSE);
}

/* ------------------------------------------------------------------------ 
 * RepaintRegion - mark a region for redrawing with background erase
 * ------------------------------------------------------------------------ */

static void RepaintRegion (HWND hWnd, int left, int top, int right, int bottom)
{
	RECT r;

	r.left   = left;
	r.top    = top;
	r.right  = right;
	r.bottom = bottom;

	InvalidateRect(hWnd, &r, TRUE);
}

/* ------------------------------------------------------------------------ 
 * update_gui - sees if anything on the console display has changed, and invalidates 
 * the changed regions. Then it calls UpdateWindow to force an immediate repaint. This
 * function (update_gui) should probably not be called every time through the main
 * instruction loop but it should be called at least whenever wait_state or int_req change, and then
 * every so many instructions.  It's also called after every simh command so manual changes are
 * reflected instantly.
 * ------------------------------------------------------------------------ */

void update_gui (BOOL force)
{	
	int i, sts;
	static int in_here = FALSE;
	static int32 displayed = 0;

	if ((int32)(console_unit.flags & UNIT_DISPLAY) != displayed) {		// setting has changed
		displayed = console_unit.flags & UNIT_DISPLAY;
		if (displayed)
			init_console_window();
		else
			destroy_console_window();
	}

	if (hConsoleWnd == NULL)
		return;

	GUI_BEGIN_CRITICAL_SECTION				/* only one thread at a time, please */
	if (in_here) {
		GUI_END_CRITICAL_SECTION
		return;
	}
	in_here = TRUE;
	GUI_END_CRITICAL_SECTION

	CND = 0;	/* combine carry and V as two bits */
	if (C)
		CND |= 2;
	if (V)
		CND |= 1;

	int_lamps |= int_req;
	if (ipl >= 0)
		int_lamps |= (0x20 >> ipl);

	if (RUNMODE == MODE_LOAD)
		SBR = CES;			/* in load mode, SBR follows the console switches */

	if (IAR != shown_iar)
			{shown_iar = IAR; 		 RedrawRegion(hConsoleWnd, 75,    8, 364,  32);}	/* lamps: don't bother erasing bkgnd */
	if (SAR != shown_sar)
			{shown_sar = SAR; 		 RedrawRegion(hConsoleWnd, 75,   42, 364,  65);}
	if (ACC != shown_acc)
			{shown_acc = ACC; 		 RedrawRegion(hConsoleWnd, 75,  141, 364, 164);}
	if (EXT != shown_ext)
			{shown_ext = EXT; 		 RedrawRegion(hConsoleWnd, 75,  174, 364, 197);}
	if (SBR != shown_sbr)
			{shown_sbr = SBR; 		 RedrawRegion(hConsoleWnd, 75,   77, 364,  97);}
	if (OP  != shown_op)		  			 
			{shown_op  = OP;  		 RedrawRegion(hConsoleWnd, 501,   8, 595,  32);}
	if (TAG != shown_tag)
			{shown_tag = TAG; 		 RedrawRegion(hConsoleWnd, 501,  77, 595,  97);}

	if (int_lamps != shown_irq)
			{shown_irq = int_lamps;  RedrawRegion(hConsoleWnd, 501, 108, 595, 130);}

	if (CCC != shown_ccc)
			{shown_ccc = CCC;		 RedrawRegion(hConsoleWnd, 501, 141, 595, 164);}
	if (CND != shown_cnd)
			{shown_cnd = CND;        RedrawRegion(hConsoleWnd, 501, 174, 595, 197);}
	if ((wait_state|wait_lamp) != shown_wait)
			{shown_wait= (wait_state|wait_lamp); RedrawRegion(hConsoleWnd, 380,  77, 414,  97);}
	if (CES != shown_ces)
			{shown_ces = CES; 		 RepaintRegion(hConsoleWnd, 115, 230, 478, 275);}	/* console entry sw: do erase bkgnd */
	if (RUNMODE != shown_runmode)
			{shown_runmode = RUNMODE;RepaintRegion(hConsoleWnd, 270, 359, 330, 418);}

	int_lamps = 0;

	for (i = 0; i < NBUTTONS; i++) {
		if (btn[i].pushable)
			continue;

		switch (i) {
			case IDC_RUN:				sts = hFlashTimer || (running && ! wait_state);		break;
//			case IDC_PARITY_CHECK:		sts = FALSE;		break;
//			case IDC_POWER_ON:			sts = TRUE;			break;
			default:
				continue;

//			case IDC_FILE_READY:		these windows are enabled&disabled directly
//			case IDC_FORMS_CHECK:
//			case IDC_KEYBOARD_SELECT:
//			case IDC_DISK_UNLOCK:
		}

		if (sts != IsWindowEnabled(btn[i].hBtn))		// status has changed
			EnableWindow(btn[i].hBtn, sts);
	}

	in_here = FALSE;
}

WNDPROC oldButtonProc = NULL;

/* ------------------------------------------------------------------------ 
 * ------------------------------------------------------------------------ */

LRESULT CALLBACK ButtonProc (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	int i;

	i = GetWindowLong(hWnd, GWL_ID);

	if (! btn[i].pushable) {
		if (uMsg == WM_LBUTTONDOWN || uMsg == WM_LBUTTONUP || uMsg == WM_LBUTTONDBLCLK)
			return 0;
		if (uMsg == WM_CHAR)
			if ((TCHAR) wParam == ' ')
				return 0;
	}

   	return CallWindowProc(oldButtonProc, hWnd, uMsg, wParam, lParam);
}

/* ------------------------------------------------------------------------ 
 * ------------------------------------------------------------------------ */

static int occurs (char *txt, char ch)
{
	int count = 0;

	while (*txt)
		if (*txt++ == ch)
			count++;

	return count;
}

/* ------------------------------------------------------------------------ 
// turns out to get properly colored buttons you have to paint them yourself. Sheesh.
// On the plus side, this lets do a better job of aligning the button text than
// the button would by itself.
 * ------------------------------------------------------------------------ */

void PaintButton (LPDRAWITEMSTRUCT dis)
{
	int i = dis->CtlID, nc, nlines, x, y, dy;
 	BOOL down = dis->itemState & ODS_SELECTED;
	HPEN hOldPen;
	HFONT hOldFont;
	UINT oldAlign;
	COLORREF oldBk;
	char *txt, *tstart;

	if (! BETWEEN(i, 0, NBUTTONS-1))
		return;

	FillRect(dis->hDC, &dis->rcItem, ((btn[i].pushable || power) && IsWindowEnabled(btn[i].hBtn)) ? btn[i].hbrLit : btn[i].hbrDark);

	if (! btn[i].pushable) {
		hOldPen = SelectObject(dis->hDC, hBlackPen);
		MoveToEx(dis->hDC, dis->rcItem.left,    dis->rcItem.top, NULL);
		LineTo(dis->hDC,   dis->rcItem.right-1, dis->rcItem.top);
		LineTo(dis->hDC,   dis->rcItem.right-1, dis->rcItem.bottom-1);
		LineTo(dis->hDC,   dis->rcItem.left,    dis->rcItem.bottom-1);
		LineTo(dis->hDC,   dis->rcItem.left,    dis->rcItem.top);
	}
	else if (down) {
		// do the three-D thing
		hOldPen = SelectObject(dis->hDC, hDkGreyPen);
		MoveToEx(dis->hDC, dis->rcItem.left,    dis->rcItem.bottom-2, NULL);
		LineTo(dis->hDC,   dis->rcItem.left,    dis->rcItem.top);
		LineTo(dis->hDC,   dis->rcItem.right-1, dis->rcItem.top);

		SelectObject(dis->hDC, hWhitePen);
		MoveToEx(dis->hDC, dis->rcItem.left,    dis->rcItem.bottom-1, NULL);
		LineTo(dis->hDC,   dis->rcItem.right-1, dis->rcItem.bottom-1);
		LineTo(dis->hDC,   dis->rcItem.right-1, dis->rcItem.top);

		SelectObject(dis->hDC, hGreyPen);
		MoveToEx(dis->hDC, dis->rcItem.left+1,  dis->rcItem.bottom-3, NULL);
		LineTo(dis->hDC,   dis->rcItem.left+1,  dis->rcItem.top+1);
		LineTo(dis->hDC,   dis->rcItem.right-3, dis->rcItem.top+1);
	}
	else {
		hOldPen = SelectObject(dis->hDC, hWhitePen);
		MoveToEx(dis->hDC, dis->rcItem.left,    dis->rcItem.bottom-2, NULL);
		LineTo(dis->hDC,   dis->rcItem.left,    dis->rcItem.top);
		LineTo(dis->hDC,   dis->rcItem.right-1, dis->rcItem.top);

		SelectObject(dis->hDC, hDkGreyPen);
		MoveToEx(dis->hDC, dis->rcItem.left,    dis->rcItem.bottom-1, NULL);
		LineTo(dis->hDC,   dis->rcItem.right-1, dis->rcItem.bottom-1);
		LineTo(dis->hDC,   dis->rcItem.right-1, dis->rcItem.top);

		SelectObject(dis->hDC, hGreyPen);
		MoveToEx(dis->hDC, dis->rcItem.left+1,  dis->rcItem.bottom-2, NULL);
		LineTo(dis->hDC,   dis->rcItem.right-2, dis->rcItem.bottom-2);
		LineTo(dis->hDC,   dis->rcItem.right-2, dis->rcItem.top+1);
	}

	SelectObject(dis->hDC, hOldPen);

	hOldFont = SelectObject(dis->hDC, hBtnFont);
	oldAlign = SetTextAlign(dis->hDC, TA_CENTER|TA_TOP);
	oldBk    = SetBkMode(dis->hDC, TRANSPARENT);

	txt = btn[i].txt;
	nlines = occurs(txt, '\n')+1;
	x  = (dis->rcItem.left + dis->rcItem.right)  / 2;
	y  = (dis->rcItem.top  + dis->rcItem.bottom) / 2;

	dy = 14;
	y  = y - (nlines*dy)/2;

	if (down) {
		x += 1;
		y += 1;
	}

	for (;;) {
		for (nc = 0, tstart = txt; *txt && *txt != '\n'; txt++, nc++)
			;

		TextOut(dis->hDC, x, y, tstart, nc);

		if (*txt == '\0')
			break;

		txt++;
		y += dy;
	}

	SetTextAlign(dis->hDC, oldAlign);
	SetBkMode(dis->hDC,    oldBk);
	SelectObject(dis->hDC, hOldFont);
}
	
/* ------------------------------------------------------------------------ 
 * ------------------------------------------------------------------------ */

HWND CreateSubclassedButton (HWND hwParent, int i)
{
	HWND hBtn;
	int x, y;
	int r, g, b;

	y = bmht - (4*BUTTON_HEIGHT) + BUTTON_HEIGHT * btn[i].y;
	x = (btn[i].x < 2) ? (btn[i].x*BUTTON_WIDTH) : (bmwid - (4-btn[i].x)*BUTTON_WIDTH);

	if ((hBtn = CreateWindow("BUTTON", btn[i].txt, WS_CHILD|WS_VISIBLE|BS_CENTER|BS_MULTILINE|BS_OWNERDRAW,
			x, y, BUTTON_WIDTH, BUTTON_HEIGHT, hwParent, (HMENU) i, hInstance, NULL)) == NULL)
		return NULL;

	btn[i].hBtn = hBtn;

	if (oldButtonProc == NULL)
		oldButtonProc = (WNDPROC) GetWindowLong(hBtn, GWL_WNDPROC);

	btn[i].hbrLit = CreateSolidBrush(btn[i].clr);

	if (! btn[i].pushable) {
		r = GetRValue(btn[i].clr) / 4;
		g = GetGValue(btn[i].clr) / 4;
		b = GetBValue(btn[i].clr) / 4;

		btn[i].hbrDark = CreateSolidBrush(RGB(r,g,b));
		EnableWindow(hBtn, FALSE);
	}

	SetWindowLong(hBtn, GWL_WNDPROC, (LONG) ButtonProc);
	return hBtn;
}

/* ------------------------------------------------------------------------ 
 * Pump - thread that takes care of the console window. It has to be a separate thread so that it gets
 * execution time even when the simulator is compute-bound or IO-blocked. This routine creates the window
 * and runs a standard Windows message pump. The window function does the actual display work.
 * ------------------------------------------------------------------------ */

static DWORD WINAPI Pump (LPVOID arg)
{
	MSG msg;
	int wx, wy, i;
	RECT r, ra;
	BITMAP bm;
	WNDCLASS cd;
	HDC hDC;
	HWND hActWnd;

	hActWnd = GetForegroundWindow();

	if (! class_defined) {							/* register Window class */
		hInstance = GetModuleHandle(NULL);

		memset(&cd, 0, sizeof(cd));
		cd.style         = CS_NOCLOSE;
		cd.lpfnWndProc   = ConsoleWndProc;
		cd.cbClsExtra    = 0;
		cd.cbWndExtra    = 0;
		cd.hInstance     = hInstance;
		cd.hIcon         = NULL;
		cd.hCursor       = hcArrow;
		cd.hbrBackground = NULL;
		cd.lpszMenuName  = NULL;
		cd.lpszClassName = szConsoleClassName;

		if (! RegisterClass(&cd)) {
			PumpID = 0;
			return 0;
		}

		class_defined = TRUE;
	}

	hbWhite = GetStockObject(WHITE_BRUSH);			/* create or fetch useful GDI objects */
	hbBlack = GetStockObject(BLACK_BRUSH);			/* create or fetch useful GDI objects */
	hbGray  = GetStockObject(GRAY_BRUSH);
	hSwitchPen = CreatePen(PS_SOLID, 5, RGB(255,255,255));

	hWhitePen  = GetStockObject(WHITE_PEN);
	hBlackPen  = GetStockObject(BLACK_PEN);
	hLtGreyPen = CreatePen(PS_SOLID, 1, RGB(190,190,190));
	hGreyPen   = CreatePen(PS_SOLID, 1, RGB(128,128,128));
	hDkGreyPen = CreatePen(PS_SOLID, 1, RGB(64,64,64));

	hcArrow = LoadCursor(NULL,      IDC_ARROW);
	hcHand  = LoadCursor(hInstance, MAKEINTRESOURCE(IDC_HAND));

	if (hBitmap   == NULL)
		hBitmap   = LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_CONSOLE));
	if (hbLampOut == NULL)
		hbLampOut = CreateSolidBrush(RGB(50,50,50));
	if (hFont     == NULL)
		hFont     = CreateFont(-10, 0, 0, 0, FW_NORMAL, 0, 0, 0, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, FIXED_PITCH, FF_SWISS, "Arial");
	if (hBtnFont  == NULL)
		hBtnFont  = CreateFont(-12, 0, 0, 0, FW_NORMAL, 0, 0, 0, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, FIXED_PITCH, FF_SWISS, "Arial");

	if (hConsoleWnd == NULL) {						/* create window */
		if ((hConsoleWnd = CreateWindow(szConsoleClassName, "IBM 1130", WS_OVERLAPPED, 0, 0, 200, 200, NULL, NULL, hInstance, NULL)) == NULL) {
			PumpID = 0;
			return 0;
		}
	}

	GetObject(hBitmap, sizeof(bm), &bm);			/* get bitmap size */
	bmwid = bm.bmWidth;
	bmht  = bm.bmHeight;

	for (i = 0; i < NBUTTONS; i++)
		CreateSubclassedButton(hConsoleWnd, i);

	EnableWindow(btn[IDC_POWER_ON].hBtn,    TRUE);
	EnableWindow(btn[IDC_DISK_UNLOCK].hBtn, TRUE);

	GetWindowRect(hConsoleWnd, &r);					/* get window size as created */
	wx = r.right  - r.left + 1;
	wy = r.bottom - r.top  + 1;

	if (hCDC == NULL) {								/* get a memory DC and select the bitmap into ti */
		hDC = GetDC(hConsoleWnd);
		hCDC = CreateCompatibleDC(hDC);
		SelectObject(hCDC, hBitmap);
		ReleaseDC(hConsoleWnd, hDC);
	}

	GetClientRect(hConsoleWnd, &r);
	wx = (wx - r.right  - 1) + bmwid;				/* compute new desired size based on how client area came out */
	wy = (wy - r.bottom - 1) + bmht;
	MoveWindow(hConsoleWnd, 0, 0, wx, wy, FALSE);	/* resize window */

	ShowWindow(hConsoleWnd, SW_SHOWNOACTIVATE);		/* display it */
	UpdateWindow(hConsoleWnd);

	if (hActWnd != NULL) {							/* bring console (sim) window back to top */
		GetWindowRect(hConsoleWnd, &r);
		ShowWindow(hActWnd, SW_NORMAL);				/* and move it just below the display window */
		SetWindowPos(hActWnd, HWND_TOP, 0, r.bottom, 0, 0, SWP_NOSIZE);
		GetWindowRect(hActWnd, &ra);
		if (ra.bottom >= GetSystemMetrics(SM_CYSCREEN)) {	/* resize if it goes of bottom of screen */
			ra.bottom = GetSystemMetrics(SM_CYSCREEN) - 1;
			SetWindowPos(hActWnd, 0, 0, 0, ra.right-ra.left+1, ra.bottom-ra.top+1, SWP_NOZORDER|SWP_NOMOVE);
		}
	}

	if (running)									/* if simulator is already running, start update timer */
		gui_run(TRUE);

	while (GetMessage(&msg, hConsoleWnd, 0, 0)) {	/* message pump - this basically loops forevermore */
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	if (hConsoleWnd != NULL) {
		DestroyWindow(hConsoleWnd);						/* but if a quit message got posted, clean up */
		hConsoleWnd = NULL;
	}

	PumpID = 0;
	return 0;
}

/* ------------------------------------------------------------------------ 
 * DrawBits - starting at position (x,y), draw lamps for nbits bits of word 'bits',	looking only at masked bits
 * ------------------------------------------------------------------------ */

static void DrawBits (HDC hDC, int x, int y, int bits, int nbits, int mask, char *syms)
{
	int i, b = 0x0001 << (nbits-1);

	for (i = 0; i < nbits; i++, b >>= 1) {
		if (mask & b) {								/* select white or black lettering then write 2 chars */
			SetTextColor(hDC, (b & bits && power) ? RGB(255,255,255) : RGB(0,0,0));
			TextOut(hDC, x, y, syms, 2);
		}
		syms += 2;									/* go to next symbol pair */

		if (i < 10)
			x += 15;								/* step between lamps */
		else
			x += 19;

		if (x < 500) {
			if (b & 0x1110)
				x += 10;							/* step over nibble divisions on left side */
			else if (b & 0x0001)
				x += 9;
		}
	}
}

/* ------------------------------------------------------------------------ 
 * DrawToggles - display the console sense switches
 * ------------------------------------------------------------------------ */

static void DrawToggles (HDC hDC, int bits)
{
	int b, x;

	for (b = 0x8000, x = 122; b != 0; b >>= 1) {
		if (shown_ces & b) {			/* up */
			SelectObject(hDC, hbWhite);
			Rectangle(hDC, x, 232, x+9, 240);
			SelectObject(hDC, hbGray);
			Rectangle(hDC, x, 239, x+9, 255);
 		}
		else {							/* down */
			SelectObject(hDC, hbWhite);
			Rectangle(hDC, x, 263, x+9, 271);
			SelectObject(hDC, hbGray);
			Rectangle(hDC, x, 248, x+9, 264);
		}

		x += (b & 0x1111) ? 31 : 21;
	}
}

/* ------------------------------------------------------------------------ 
 * DrawRunmode - draw the run mode rotary switch's little tip
 * ------------------------------------------------------------------------ */

void DrawRunmode (HDC hDC, int mode)
{
	double angle = (mode*45. + 90.) * 3.1415926 / 180.;		/* convert mode position to angle in radians */
	double ca, sa;											/* sine and cosine */
	int x0, y0, x1, y1;
	HPEN hOldPen;

	ca = cos(angle);
	sa = sin(angle);

	x0 = 301 + (int) (20.*ca + 0.5);		/* inner radius */
	y0 = 389 - (int) (20.*sa + 0.5);
	x1 = 301 + (int) (25.*ca + 0.5);		/* outer radius */
	y1 = 389 - (int) (25.*sa + 0.5);

	hOldPen = SelectObject(hDC, hSwitchPen);

	MoveToEx(hDC, x0, y0, NULL);
	LineTo(hDC, x1, y1);

	SelectObject(hDC, hOldPen);
}

/* ------------------------------------------------------------------------ 
 * HandleClick - handle mouse clicks on the console window. Now we just 
 * look at the console sense switches.  Actual says this is a real click, rather
 * than a mouse-region test.  Return value TRUE means the cursor is over a hotspot.
 * ------------------------------------------------------------------------ */

static BOOL HandleClick (HWND hWnd, int xh, int yh, BOOL actual)
{
	int b, x, r, ang, i;

	for (b = 0x8000, x = 122; b != 0; b >>= 1) {
		if (BETWEEN(xh, x-3, x+8+3) && BETWEEN(yh, 230, 275)) {
			if (actual) {
				CES ^= b;						/* a hit. Invert the bit and redisplay */
				update_gui(TRUE);
			}
			return TRUE;
		}
		x += (b & 0x1111) ? 31 : 21;
	}

	if (BETWEEN(xh, 245, 355) && BETWEEN(yh, 345, 425)) {		/* hit near rotary switch */
		ang = (int) (atan2(301.-xh, 389.-yh)*180./3.1415926);	/* this does implicit 90 deg rotation by the way */
		r = (int) sqrt((xh-301)*(xh-301)+(yh-389)*(yh-389));
		if (r > 12) {
			for (i = MODE_LOAD; i <= MODE_INT_RUN; i++) {
				if (BETWEEN(ang, i*45-12, i*45+12)) {
					if (actual) {
						RUNMODE = i;
						update_gui(TRUE);
					}
					return TRUE;
				}
			}
			
		}
	}

	return FALSE;
}

/* ------------------------------------------------------------------------ 
 * DrawConsole - refresh the console display. (This routine could be sped up by intersecting
 * the various components' bounding rectangles with the repaint rectangle.  The bounding rects
 * could be put into an array and used both here and in the refresh routine).
 *
 * RedrawRegion -> force repaint w/o background redraw. used for lamps which are drawn in the same place in either state
 * RepaintRegion-> repaint with background redraw. Used for toggles which change position.
 * ------------------------------------------------------------------------ */

static void DrawConsole (HDC hDC)
{
	static char digits[] = " 0 1 2 3 4 5 6 7 8 9101112131415";
	static char cccs[]   = "3216 8 4 2 1";
	static char cnds[]   = " C V";
	static char waits[]  = " W";
	HFONT hOldFont, hOldBrush;

	hOldFont  = SelectObject(hDC, hFont);			/* use that tiny font */
	hOldBrush = SelectObject(hDC, hbWhite);

	SetBkMode(hDC, TRANSPARENT);					/* overlay letters w/o changing background */

	DrawBits(hDC,  76,  15, shown_iar,    16, 0x3FFF, digits);
	DrawBits(hDC,  76, 	48, shown_sar,    16, 0x3FFF, digits);
	DrawBits(hDC,  76,  81, shown_sbr,    16, 0xFFFF, digits);
	DrawBits(hDC,  76, 147, shown_acc,    16, 0xFFFF, digits);
	DrawBits(hDC,  76, 180, shown_ext,    16, 0xFFFF, digits);

	DrawBits(hDC, 506,  15, shown_op,      5, 0x001F, digits);
	DrawBits(hDC, 506,  81, shown_tag,     4, 0x0007, digits);
	DrawBits(hDC, 506, 114, shown_irq,     6, 0x003F, digits);
	DrawBits(hDC, 506, 147, shown_ccc,     6, 0x003F, cccs);
	DrawBits(hDC, 506, 180, shown_cnd,     2, 0x0003, cnds);

	DrawBits(hDC, 390,  81, shown_wait?1:0,1, 0x0001, waits);

	DrawToggles(hDC, shown_ces);

	DrawRunmode(hDC, shown_runmode);

	SelectObject(hDC, hOldFont);
	SelectObject(hDC, hOldBrush);
}

/* ------------------------------------------------------------------------ 
 * Handles button presses. Remember that this occurs in the context of 
 * the Pump thread, not the simulator thread.
 * ------------------------------------------------------------------------ */

void flash_run (void)              
{
	EnableWindow(btn[IDC_RUN].hBtn, TRUE);		// enable the run lamp

	if (hFlashTimer != 0)
		KillTimer(hConsoleWnd, FLASH_TIMER_ID);	// (re)schedule lamp update

	hFlashTimer = SetTimer(hConsoleWnd, FLASH_TIMER_ID, LAMPTIME, NULL);
}

void gui_run (int running)
{
	if (running && hUpdateTimer == 0 && hConsoleWnd != NULL) {
		hUpdateTimer = SetTimer(hConsoleWnd, UPDATE_TIMER_ID, 1000/UPDATE_INTERVAL, NULL);
	}
	else if (hUpdateTimer != 0 && ! running) {
		KillTimer(hConsoleWnd, UPDATE_TIMER_ID);
		hUpdateTimer = 0;
	}
	flash_run();								/* keep run lamp active for a while after we stop running */
} 

void HandleCommand (HWND hWnd, WPARAM wParam, LPARAM lParam)
{
	int i;

	switch (wParam) {
		case IDC_POWER:						/* toggle system power */
			power = ! power;
			reset_all(0);
			if (running && ! power) {		/* turning off */
				reason = STOP_POWER_OFF;
				while (running)
					Sleep(10);				/* wait for execution thread to exit */
			}
			EnableWindow(btn[IDC_POWER_ON].hBtn, power);
			for (i = 0; i < NBUTTONS; i++)
				InvalidateRect(btn[i].hBtn, NULL, TRUE);
			break;

		case IDC_PROGRAM_START:				/* begin execution */
			if (! running) {
				switch (RUNMODE) {
					case MODE_INT_RUN:
					case MODE_RUN:
					case MODE_SI:
						stuff_cmd("go");
						break;

					case MODE_DISP:			/* display core and advance IAR */
						ReadW(IAR);
						IAR = IAR+1;
						flash_run();		/* illuminate run lamp for .5 sec */
						break;

					case MODE_LOAD:			/* store to core and advance IAR */
						WriteW(IAR, CES);
						IAR = IAR+1;
						flash_run();
						break;
				}
			}
			break;

		case IDC_PROGRAM_STOP:
			if (running) {					/* potential race condition here */
				GUI_BEGIN_CRITICAL_SECTION
				SETBIT(cpu_dsw, CPU_DSW_PROGRAM_STOP);
				SETBIT(ILSW[5], ILSW_5_PROGRAM_STOP);
				int_req |= INT_REQ_5;
				GUI_END_CRITICAL_SECTION
			}
			break;

		case IDC_LOAD_IAR:
			if (! running) {
				IAR = CES & 0x3FFF;			/* set IAR from console entry switches */
			}
			break;

		case IDC_KEYBOARD:					/* toggle between console/keyboard mode */
			break;

		case IDC_IMM_STOP:
			if (running) {
				reason = STOP_WAIT;			/* terminate execution without setting wait_mode */
				while (running)
					Sleep(10);				/* wait for execution thread to exit */
			}
			break;

		case IDC_RESET:
			if (! running) {				/* check-reset is disabled while running */
				reset_all(0);
				forms_check(0);				/* clear forms-check status */
				print_check(0);
			}
			break;

		case IDC_PROGRAM_LOAD:
			if (! running) {				/* if card reader is attached to a file, do cold start read of one card */
				IAR = 0;					/* reset IAR */
//				stuff_cmd("boot cr");
				if (cr_boot(0, NULL) != SCPE_OK)	/* load boot card */
					remark_cmd("IPL failed");
			}
			break;
	}
	
	update_gui(FALSE);
}

/* ------------------------------------------------------------------------ 
 * ConsoleWndProc - window process for the console display
 * ------------------------------------------------------------------------ */

LRESULT CALLBACK ConsoleWndProc (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	HDC hDC;
	PAINTSTRUCT ps;
	POINT p;
	RECT clip, xsect, rbmp;
	int i;

	switch (uMsg) {
		case WM_CLOSE:
			DestroyWindow(hWnd);
			break;

		case WM_DESTROY:
			gui_run(FALSE);
			hConsoleWnd = NULL;
			break;

		case WM_ERASEBKGND:
			hDC = (HDC) wParam;
			GetClipBox(hDC, &clip);
			SetRect(&rbmp, 0, 0, bmwid, bmht);
			if (IntersectRect(&xsect, &clip, &rbmp))
				BitBlt(hDC, xsect.left, xsect.top, xsect.right-xsect.left+1, xsect.bottom-xsect.top+1, hCDC, xsect.left, xsect.top, SRCCOPY);
//			rbmp.top = rbmp.bottom;
//			rbmp.bottom += 200;
//			if (IntersectRect(&xsect, &clip, &rbmp))
//				FillRect(hDC, &xsect, hbBlack);
			return TRUE;			/* let Paint do this so we know what the update region is (ps.rcPaint) */

		case WM_PAINT:
			hDC = BeginPaint(hWnd, &ps);
			DrawConsole(hDC);
			EndPaint(hWnd, &ps);
			break;

		case WM_COMMAND:			/* button click */
			HandleCommand(hWnd, wParam, lParam);
			break;

		case WM_DRAWITEM:
			PaintButton((LPDRAWITEMSTRUCT) lParam);
			break;

		case WM_SETCURSOR:
			GetCursorPos(&p);
			ScreenToClient(hWnd, &p);
			SetCursor(HandleClick(hWnd, p.x, p.y, FALSE) ? hcHand : hcArrow);
			return TRUE;

		case WM_LBUTTONDOWN:
			HandleClick(hWnd, LOWORD(lParam), HIWORD(lParam), TRUE);
			break;

		case WM_CTLCOLORBTN:
			i = GetWindowLong((HWND) lParam, GWL_ID);
			if (BETWEEN(i, 0, NBUTTONS-1))
				return (LRESULT) (power && IsWindowEnabled((HWND) lParam) ? btn[i].hbrLit : btn[i].hbrDark);

		case WM_TIMER:
			if (wParam == FLASH_TIMER_ID && hFlashTimer != 0) {
				KillTimer(hWnd, FLASH_TIMER_ID);
				hFlashTimer = 0;
			}
			update_gui(FALSE);
			break;

		default:
			return DefWindowProc(hWnd, uMsg, wParam, lParam);
	}

	return 0;
}

enum {PRINTER_OK = 0, FORMS_CHECK = 1, PRINT_CHECK = 2, BOTH_CHECK = 3} printerstatus = PRINTER_OK;

void forms_check (int set)
{
	COLORREF oldcolor = btn[IDC_FORMS_CHECK].clr;

	if (set)
		SETBIT(printerstatus, FORMS_CHECK);
	else
		CLRBIT(printerstatus, FORMS_CHECK);

	btn[IDC_FORMS_CHECK].clr = (printerstatus & PRINT_CHECK) ? RGB(255,0,0) : RGB(255,255,0);

	EnableWindow(btn[IDC_FORMS_CHECK].hBtn, printerstatus);

	if (btn[IDC_FORMS_CHECK].clr != oldcolor)
		InvalidateRect(btn[IDC_FORMS_CHECK].hBtn, NULL, TRUE);		// change color in any case
}

void print_check (int set)
{
	COLORREF oldcolor = btn[IDC_FORMS_CHECK].clr;

	if (set)
		SETBIT(printerstatus, PRINT_CHECK);
	else
		CLRBIT(printerstatus, PRINT_CHECK);

	btn[IDC_FORMS_CHECK].clr = (printerstatus & PRINT_CHECK) ? RGB(255,0,0) : RGB(255,255,0);

	EnableWindow(btn[IDC_FORMS_CHECK].hBtn, printerstatus);

	if (btn[IDC_FORMS_CHECK].clr != oldcolor)
		InvalidateRect(btn[IDC_FORMS_CHECK].hBtn, NULL, TRUE);		// change color in any case
}

void keyboard_selected (int select)
{
	EnableWindow(btn[IDC_KEYBOARD_SELECT].hBtn, select);
}

void disk_ready (int ready)
{
	EnableWindow(btn[IDC_FILE_READY].hBtn, ready);
}

void disk_unlocked (int unlocked)
{
	EnableWindow(btn[IDC_DISK_UNLOCK].hBtn, unlocked);
}

CRITICAL_SECTION critsect;

void begin_critical_section (void)
{
	static BOOL mustinit = TRUE;

	if (mustinit) {
		InitializeCriticalSection(&critsect);
		mustinit = FALSE;
	}

	EnterCriticalSection(&critsect);
}

void end_critical_section (void)
{
	LeaveCriticalSection(&critsect);
}

#ifndef MIN
#  define MIN(a,b) (((a) <= (b)) ? (a) : (b))
#endif

/* win32 - use a separate thread to read command lines so the GUI
 * can insert commands as well */

static HANDLE hCmdThread     = NULL;
static DWORD  iCmdThreadID   = 0;
static HANDLE hCmdReadEvent  = NULL;
static HANDLE hCmdReadyEvent = NULL;
static BOOL   scp_stuffed = FALSE, scp_reading = FALSE;
static char   cmdbuffer[256];

/* CmdThread - separate thread to read commands from stdin upon request */

static DWORD WINAPI CmdThread (LPVOID arg)
{
	for (;;) {
		WaitForSingleObject(hCmdReadEvent, INFINITE);		/* wait for request */
		read_line(cmdbuffer, sizeof(cmdbuffer), stdin);		/* read one line */
		scp_stuffed = FALSE;								/* say how we got it */
		SetEvent(hCmdReadyEvent);							/* notify main thread a line is ready */
	}
	return 0;
}									

char *read_cmdline (char *ptr, int size, FILE *stream)
{
	char *cptr;

	if (hCmdThread == NULL)	{								/* set up command-reading thread */
		if ((hCmdReadEvent  = CreateEvent(NULL, FALSE, FALSE, NULL)) == NULL)
			scp_panic("Can't create command line read event");

		if ((hCmdReadyEvent = CreateEvent(NULL, FALSE, FALSE, NULL)) == NULL)
			scp_panic("Can't create command line ready event");
																/* start up the command thread */
		if ((hCmdThread = CreateThread(NULL, 0, CmdThread, NULL, 0, &iCmdThreadID)) == NULL)
			scp_panic("Unable to create command line reading thread");
	}

	scp_reading = TRUE;

	SetEvent(hCmdReadEvent);								/* let read thread get one line */
	WaitForSingleObject(hCmdReadyEvent, INFINITE);			/* wait for read thread or GUI to respond */

	scp_reading = FALSE;

	strncpy(ptr, cmdbuffer, MIN(size, sizeof(cmdbuffer)));	/* copy line to caller's buffer */
	
	for (cptr = ptr; isspace(*cptr); cptr++)				/* absorb spaces */
		;

	if (scp_stuffed) {										/* stuffed command needs to be echoed */
		printf("%s\n", cptr);
		if (sim_log) fprintf(sim_log, "%s\n", cptr);
	}

	return cptr;
}

/* stuff_cmd - force a command into the read_cmdline output buffer. Called asynchronously by GUI */

void stuff_cmd (char *cmd)
{
	strcpy(cmdbuffer, cmd);									/* save the string */
	scp_stuffed = TRUE;										/* note where it came from */
	SetEvent(hCmdReadyEvent);								/* notify main thread a line is ready */
}

/* remark_cmd - print a remark from inside a command processor. This routine takes
 * into account the possiblity that the command might have been stuffed, in which
 * case the sim> prompt needs to be reprinted.
 */

void remark_cmd (char *remark)
{
	printf("%s\n", remark);
	if (sim_log) fprintf(sim_log, "%s\n", remark);
	if (scp_reading) {
		printf("sim> ");
		if (sim_log) fprintf(sim_log, "sim> ");
	}
}

#endif 		// WIN32 defined
#endif		// GUI_SUPPORT defined