#include "GameManager.h"

static pascal void Timer(EventLoopTimerRef r, void * d)
{
	#pragma unused(r)
	VGame * g;
	UnsignedWide microseconds;
	float interval;
	Vector front, push;
	
	g = (VGame *)d;
	
	microseconds = UpTime();
	interval = (10000.0 / (microseconds.lo - g->lastTime.lo));
	g->lastTime = microseconds;
	
	if (!g->Paused) {
  	RunWorld(&g->world, interval);
	}
	
	glClear(GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	
	ForwardsVector(&g->world.Camera, 1.0, &front);
	push = front;
	if (g->Direction & STOP) {
	  StopShip(&g->world.Physics, (SHIPACCELERATION / interval));
	} else if (g->Direction & FORWARDS) {
  	push.x *= (SHIPACCELERATION / interval);
		push.y *= (SHIPACCELERATION / interval);
		push.z *= (SHIPACCELERATION / interval);
		PushShip(&g->world.Physics, &push);
	} else if (g->Direction & BACKWARDS) {
  	push.x *= -(SHIPACCELERATION / interval);
		push.y *= -(SHIPACCELERATION / interval);
		push.z *= -(SHIPACCELERATION / interval);
		PushShip(&g->world.Physics, &push);
	}
	TurnShip(&g->world.Physics, g->Rotation, interval);
	
	DrawWorld(&g->world, interval);
	
	if(g->w.IsFullScreen)
		aglSwapBuffers(g->w.FullScreen);
	else
		aglSwapBuffers(g->w.Windowed);
}

static pascal OSStatus MenuSelected(EventHandlerCallRef r, 
	EventRef e, void * d)
{
	#pragma unused(r)
	VGame * g;
	HICommand TheCommand;
	g = (VGame *)d;
	
	GetEventParameter(e, kEventParamDirectObject, typeHICommand, NULL, 
		sizeof(HICommand), NULL, &TheCommand);
	
	switch(TheCommand.commandID)
	{
		case 'FScn':
			if (g->w.IsFullScreen) {
				CreateWindowedContext(&g->w);
				if (g->Paused) {
					glClear(GL_DEPTH_BUFFER_BIT);
					DrawWorld(&g->world, 1.0);
					aglSwapBuffers(g->w.Windowed);
				}
			} else {
				CreateFullScreenContext(&g->w);
				if (g->Paused) {
					glClear(GL_DEPTH_BUFFER_BIT);
					DrawWorld(&g->world, 1.0);
					aglSwapBuffers(g->w.FullScreen);
				}
			}
			
			return noErr;
			break;
		case 'abou':
			OpenAboutWindow(&g->m);
			return noErr;
			break;
		default:
			return eventNotHandledErr;
	}
}

static pascal OSStatus KeyDown(EventHandlerCallRef nextEvent, EventRef theEvent, void * userData) {
	#pragma unused (nextEvent)
	VGame * g;
	char charCode;
	UInt32 modifiers;
	
	g = (VGame *) userData;
	GetEventParameter(theEvent, kEventParamKeyMacCharCodes, typeChar, NULL, sizeof(char), NULL, &charCode);
	GetEventParameter(theEvent, kEventParamKeyModifiers, typeUInt32, NULL, sizeof(UInt32), NULL, &modifiers);
	switch (charCode) {
		case 28: /* Left arrow */
			g->Rotation &= ~RIGHT;
			g->Rotation |= LEFT;
			break;
		case 29: /* Right arrow */
			g->Rotation &= ~LEFT;
			g->Rotation |= RIGHT;
			break;
		case 30: /* Up arrow */
			g->Rotation &= ~DOWN;
			g->Rotation |= UP;
			break;
		case 31: /* Down arrow */
			g->Rotation &= ~UP;
			g->Rotation |= DOWN;
			break;
		case ' ':
			if(modifiers & shiftKey)
				g->Direction = BACKWARDS;
			else
				g->Direction = FORWARDS;
			break;
		case 'b':
		case 'B':
			g->Direction |= STOP;
			break;
		case 'f':
		case 'F':
	    AddWeapon(&g->world, WEAPONTYPEBULLET);
		  break;
		case 'r':
		case 'R':
			AddWeapon(&g->world, WEAPONTYPEROCKET);
		  break;
		case 'p':
		case 'P':
		  if (g->Paused) {
        SetEventLoopTimerNextFireTime(g->timerRef, (kEventDurationSecond / 120.0));
        g->lastTime = UpTime();
	    } else {
        SetEventLoopTimerNextFireTime(g->timerRef, kEventDurationForever);
	    }
	    g->Paused = !g->Paused;
		  break;
		case ']':
		  if (g->Paused) {
		    g->Paused = 0;
		    g->lastTime = UpTime();
		    g->lastTime.lo -= 100000;
		    Timer(NULL, g);
		    g->Paused = 1;
		  }
		  break;
	}
	
	return eventNotHandledErr;
}

static pascal OSStatus KeyUp(EventHandlerCallRef nextEvent, EventRef theEvent, void * userData) {
	#pragma unused(nextEvent)
	VGame * g;
	char charCode;
	
	g = (VGame *) userData;
	GetEventParameter(theEvent, kEventParamKeyMacCharCodes, typeChar, NULL, sizeof(char), NULL, &charCode);
	switch (charCode) {
		case 28: /* Left arrow */
			g->Rotation &= ~LEFT;
			break;
		case 29: /* Right arrow */
			g->Rotation &= ~RIGHT;
			break;
		case 30: /* Up arrow */
			g->Rotation &= ~UP;
			break;
		case 31: /* Down arrow */
			g->Rotation &= ~DOWN;
			break;
		case ' ':
			g->Direction &= ~(FORWARDS | BACKWARDS);
			break;
		case 'b':
		case 'B':
			g->Direction &= ~STOP;
			break;
	}
	
	return eventNotHandledErr;
}

static pascal OSStatus AppActivated(EventHandlerCallRef nextEvent, EventRef theEvent, void * userData) {
	#pragma unused(nextEvent, theEvent)
	VGame * g;
	
	g = (VGame *) userData;
	if (!g->Paused) SetEventLoopTimerNextFireTime(g->timerRef, (kEventDurationSecond / 120.0));
	g->lastTime = UpTime();
	return eventNotHandledErr;
}

static pascal OSStatus AppDeactivated(EventHandlerCallRef nextEvent, EventRef theEvent, void * userData) {
	#pragma unused(nextEvent, theEvent)
	VGame * g;
	
	g = (VGame *) userData;
	SetEventLoopTimerNextFireTime(g->timerRef, kEventDurationForever);
	return eventNotHandledErr;
}

void InitGame(VGame * g)
{
	EventTypeSpec eventType;
	
	InitCursor();
	InstallEventLoopTimer(GetMainEventLoop(), 0, (kEventDurationSecond / 120.0), 
		NewEventLoopTimerUPP(Timer), g, &g->timerRef);
	
	eventType.eventClass = kEventClassCommand;
	eventType.eventKind = kEventProcessCommand;
	InstallEventHandler(GetApplicationEventTarget(), 
		NewEventHandlerUPP(MenuSelected), 1, &eventType, g, NULL);
	eventType.eventClass = kEventClassKeyboard;
	eventType.eventKind = kEventRawKeyDown;
	InstallApplicationEventHandler(NewEventHandlerUPP(KeyDown), 1, &eventType, g, NULL);
	eventType.eventClass = kEventClassKeyboard;
	eventType.eventKind = kEventRawKeyUp;
	InstallApplicationEventHandler(NewEventHandlerUPP(KeyUp), 1, &eventType, g, NULL);
	eventType.eventClass = kEventClassApplication;
	eventType.eventKind = kEventAppActivated;
	InstallApplicationEventHandler(NewEventHandlerUPP(AppActivated), 1, &eventType, g, NULL);
	eventType.eventClass = kEventClassApplication;
	eventType.eventKind = kEventAppDeactivated;
	InstallApplicationEventHandler(NewEventHandlerUPP(AppDeactivated), 1, &eventType, g, NULL);
	
	SetQDGlobalsRandomSeed(TickCount());
	
	InitMenu(&g->m);
	InitWindow(&g->w);
	InitWorld(&g->world);
	
	g->Direction = STATIONARY;
	g->Rotation = STATIONARY;
	
	g->lastTime = UpTime();
	
	g->w.quitOnClose = true;
	
	g->Paused = 0;
}

void RunGame(VGame * g)
{
	InitGame(g);
	RunApplicationEventLoop();
	CleanUpGame(g);
}

void CleanUpGame(VGame * g)
{
	RemoveEventLoopTimer(g->timerRef);

	CleanUpWindow(&g->w);
	CleanUpMenu(&g->m);
	CleanUpWorld(&g->world);
}