//
// File:		BasicOpenGLView.m
//
// Abstract:	Basic OpenGL View with Renderer information
//
// Version:		1.1 - minor fixes.
//				1.0 - Original release.
//				
//
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#import <Cocoa/Cocoa.h>
#import "BasicOpenGLView.h"

/* Tells the application to quit once the main window closes */

@implementation AppDelegate

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication
{
   return YES;
}

@end

int main(int argc, char *argv[])
{
   return NSApplicationMain(argc,  (const char **) argv);
}

// ==================================

// time and message info
CFAbsoluteTime gMsgPresistance = 10.0f;

// error output
GLString * gErrStringTex;
float gErrorTime;

#pragma mark ---- Utilities ----

static CFAbsoluteTime gStartTime = 0.0f;

// set app start time
static void setStartTime (void)
{	
   gStartTime = CFAbsoluteTimeGetCurrent();
}

// ---------------------------------

// return float elpased time in seconds since app start
static CFAbsoluteTime getElapsedTime (void)
{	
   return CFAbsoluteTimeGetCurrent() - gStartTime;
}

#pragma mark ---- Error Reporting ----

// error reporting as both window message and debugger string
void reportError (char * strError)
{
    NSMutableDictionary *attribs = [NSMutableDictionary dictionary];
    [attribs setObject: [NSFont fontWithName: @"Monaco" size: 9.0f] forKey: NSFontAttributeName];
    [attribs setObject: [NSColor whiteColor] forKey: NSForegroundColorAttributeName];

	gErrorTime = getElapsedTime ();
	NSString * errString = [NSString stringWithFormat:@"Error: %s (at time: %0.1f secs).", strError, gErrorTime];
	NSLog (@"%@\n", errString);
	if (gErrStringTex)
		[gErrStringTex setString:errString withAttributes:attribs];
	else {
		gErrStringTex = [[GLString alloc] initWithString:errString withAttributes:attribs withTextColor:[NSColor colorWithDeviceRed:1.0f green:1.0f blue:1.0f alpha:1.0f] withBoxColor:[NSColor colorWithDeviceRed:1.0f green:0.0f blue:0.0f alpha:0.3f] withBorderColor:[NSColor colorWithDeviceRed:1.0f green:0.0f blue:0.0f alpha:0.8f]];
	}
}

// ---------------------------------

// if error dump gl errors to debugger string, return error
GLenum glReportError (void)
{
	GLenum err = glGetError();
	if (GL_NO_ERROR != err)
		reportError ((char *) gluErrorString (err));
	return err;
}

#pragma mark ---- OpenGL Utils ----

// ===================================

@implementation BasicOpenGLView

// pixel format definition
+ (NSOpenGLPixelFormat*) basicPixelFormat
{
    NSOpenGLPixelFormatAttribute attributes [] = {
        NSOpenGLPFAWindow,
        NSOpenGLPFADoubleBuffer,	// double buffered
        NSOpenGLPFADepthSize, (NSOpenGLPixelFormatAttribute)16, // 16 bit depth buffer
        (NSOpenGLPixelFormatAttribute)nil
    };
    return [[[NSOpenGLPixelFormat alloc] initWithAttributes:attributes] autorelease];
}

// ---------------------------------

// handles resizing of GL need context update and if the window dimensions change, a
// a window dimension update, reseting of viewport and an update of the projection matrix
- (void) resizeGL
{
	NSRect rectView = [self bounds];
	
	// ensure camera knows size changed
	if ((camera.viewHeight != rectView.size.height) ||
	    (camera.viewWidth != rectView.size.width)) {
		camera.viewHeight = rectView.size.height;
		camera.viewWidth = rectView.size.width;
		
		glViewport (0, 0, camera.viewWidth, camera.viewHeight);
        [[self openGLContext] makeCurrentContext];
		[self updateInfoString];
	}
}

// ---------------------------------

// sets the camera data to initial conditions
- (void) resetCamera
{
   camera.aperture = 40;

   camera.viewPos.x = 0.0;
   camera.viewPos.y = 0.0;
   camera.viewPos.z = -10.0;
   camera.viewDir.x = -camera.viewPos.x; 
   camera.viewDir.y = -camera.viewPos.y; 
   camera.viewDir.z = -camera.viewPos.z;

   camera.viewUp.x = 0;  
   camera.viewUp.y = 1; 
   camera.viewUp.z = 0;
}

// ---------------------------------

// per-window timer function, basic time based animation preformed here
- (void)animationTimer:(NSTimer *)timer
{
	BOOL shouldDraw = NO;
    
	if (fAnimate)
    {
		CFTimeInterval deltaTime = CFAbsoluteTimeGetCurrent () - time;
			
		if (deltaTime > 10.0) // skip pauses
			return;
		else
			shouldDraw = YES; // force redraw
	}
    
	time = CFAbsoluteTimeGetCurrent (); //reset time in all cases
	
    // if we have current messages
	if (((getElapsedTime () - msgTime) < gMsgPresistance) ||
        ((getElapsedTime () - gErrorTime) < gMsgPresistance))
		shouldDraw = YES; // force redraw
    
	if (shouldDraw == YES)
		[self drawRect:[self bounds]]; // redraw now instead dirty to enable updates during live resize
}

#pragma mark ---- Text Drawing ----

// these functions create or update GLStrings one should expect to have to regenerate the image, bitmap and texture when the string changes thus these functions are not particularly light weight

- (void) updateInfoString
{ // update info string texture
	NSString * string = [NSString stringWithFormat:@"(%0.0f x %0.0f) \n%s \n%s", [self bounds].size.width, [self bounds].size.height, glGetString (GL_RENDERER), glGetString (GL_VERSION)];
	if (infoStringTex)
		[infoStringTex setString:string withAttributes:stanStringAttrib];
	else {
		infoStringTex = [[GLString alloc] initWithString:string withAttributes:stanStringAttrib withTextColor:[NSColor colorWithDeviceRed:1.0f green:1.0f blue:1.0f alpha:1.0f] withBoxColor:[NSColor colorWithDeviceRed:0.5f green:0.5f blue:0.5f alpha:0.5f] withBorderColor:[NSColor colorWithDeviceRed:0.8f green:0.8f blue:0.8f alpha:0.8f]];
	}
}

// ---------------------------------

- (void) createHelpString
{
	NSString * string = [NSString stringWithFormat:@"Cmd-I: show info \n'h': toggle help"];
	helpStringTex = [[GLString alloc] initWithString:string withAttributes:stanStringAttrib withTextColor:[NSColor colorWithDeviceRed:1.0f green:1.0f blue:1.0f alpha:1.0f] withBoxColor:[NSColor colorWithDeviceRed:0.0f green:0.5f blue:0.0f alpha:0.5f] withBorderColor:[NSColor colorWithDeviceRed:0.3f green:0.8f blue:0.3f alpha:0.8f]];
}

// ---------------------------------

- (void) createMessageString
{
	NSString * string = [NSString stringWithFormat:@"No messages..."];
	msgStringTex = [[GLString alloc] initWithString:string withAttributes:stanStringAttrib withTextColor:[NSColor colorWithDeviceRed:1.0f green:1.0f blue:1.0f alpha:1.0f] withBoxColor:[NSColor colorWithDeviceRed:0.5f green:0.5f blue:0.5f alpha:0.5f] withBorderColor:[NSColor colorWithDeviceRed:0.8f green:0.8f blue:0.8f alpha:0.8f]];
}

// ---------------------------------

// draw text info using our GLString class for much more optimized text drawing
- (void) drawInfo
{	
	GLint matrixMode;
	GLboolean depthTest = glIsEnabled (GL_DEPTH_TEST);
	GLfloat height, width, messageTop = 10.0f;
	
	height = camera.viewHeight;
	width = camera.viewWidth;
		
	// set orthograhic 1:1  pixel transform in local view coords
	glGetIntegerv (GL_MATRIX_MODE, &matrixMode);
	glMatrixMode (GL_PROJECTION);
	glPushMatrix();
		glLoadIdentity ();
		glMatrixMode (GL_MODELVIEW);
		glPushMatrix();
			glLoadIdentity ();
			glScalef (2.0f / width, -2.0f /  height, 1.0f);
			glTranslatef (-width / 2.0f, -height / 2.0f, 0.0f);
			
			glColor4f (1.0f, 1.0f, 1.0f, 1.0f);
			[infoStringTex drawAtPoint:NSMakePoint (10.0f, height - [infoStringTex frameSize].height - 10.0f)];
			[camStringTex drawAtPoint:NSMakePoint (10.0f, messageTop)];
			messageTop += [camStringTex frameSize].height + 3.0f;

			if (fDrawHelp)
				[helpStringTex drawAtPoint:NSMakePoint (floor ((width - [helpStringTex frameSize].width) / 2.0f), floor ((height - [helpStringTex frameSize].height) / 3.0f))];

			// message string
			float currTime = getElapsedTime ();
			if ((currTime - msgTime) < gMsgPresistance) {
				GLfloat comp = (gMsgPresistance - getElapsedTime () + msgTime) * 0.1; // premultiplied fade
				glColor4f (comp, comp, comp, comp);
				[msgStringTex drawAtPoint:NSMakePoint (10.0f, messageTop)];
				messageTop += [msgStringTex frameSize].height + 3.0f;
			}
			// global error message
			if ((currTime - gErrorTime) < gMsgPresistance) {
				GLfloat comp = (gMsgPresistance - getElapsedTime () + gErrorTime) * 0.1; // premultiplied fade
				glColor4f (comp, comp, comp, comp);
				[gErrStringTex drawAtPoint:NSMakePoint (10.0f, messageTop)];
			}

		// reset orginal martices
		glPopMatrix(); // GL_MODELVIEW
		glMatrixMode (GL_PROJECTION);
	glPopMatrix();
	glMatrixMode (matrixMode);

	glDisable (GL_TEXTURE_RECTANGLE_EXT);
	glDisable (GL_BLEND);
	glReportError ();
}

#pragma mark ---- IB Actions ----

-(IBAction) animate: (id) sender
{
	fAnimate = 1 - fAnimate;
	if (fAnimate)
		[animateMenuItem setState: NSOnState];
	else 
		[animateMenuItem setState: NSOffState];
}

// ---------------------------------

-(IBAction) info: (id) sender
{
	fInfo = 1 - fInfo;
	if (fInfo)
		[infoMenuItem setState: NSOnState];
	else
		[infoMenuItem setState: NSOffState];
	[self setNeedsDisplay: YES];
}

#pragma mark ---- Method Overrides ----

-(void)keyDown:(NSEvent *)theEvent
{
    NSString *characters = [theEvent characters];
    if ([characters length]) {
        unichar character = [characters characterAtIndex:0];
		switch (character) {
			case 'h':
				// toggle help
				fDrawHelp = 1 - fDrawHelp;
				[self setNeedsDisplay: YES];
				break;
		}
	}
}

// ---------------------------------

- (void)mouseDown:(NSEvent *)theEvent // trackball
{
}

// ---------------------------------

- (void)rightMouseDown:(NSEvent *)theEvent // pan
{
}

// ---------------------------------

- (void)otherMouseDown:(NSEvent *)theEvent //dolly
{
}

// ---------------------------------

- (void)mouseUp:(NSEvent *)theEvent
{
}

// ---------------------------------

- (void)rightMouseUp:(NSEvent *)theEvent
{
}

// ---------------------------------

- (void)otherMouseUp:(NSEvent *)theEvent
{
}

// ---------------------------------

- (void)mouseDragged:(NSEvent *)theEvent
{
}

// ---------------------------------

- (void)scrollWheel:(NSEvent *)theEvent
{
}

// ---------------------------------

- (void)rightMouseDragged:(NSEvent *)theEvent
{
}

// ---------------------------------

- (void)otherMouseDragged:(NSEvent *)theEvent
{
}

// ---------------------------------

- (void) drawRect:(NSRect)rect
{		
	// setup viewport and prespective
	[self resizeGL]; // forces projection matrix update (does test for size changes)
	// clear our drawable
	glClear (GL_COLOR_BUFFER_BIT);
	
	// model view and projection matricies already set

    if (fInfo)
		[self drawInfo];
		
	if ([self inLiveResize] && !fAnimate)
		glFlush ();
	else
		[[self openGLContext] flushBuffer];
	glReportError ();
}

// ---------------------------------

// set initial OpenGL state (current context is set)
// called after context is created
- (void) prepareOpenGL
{
    long swapInt = 1;

    [[self openGLContext] setValues:&swapInt forParameter:NSOpenGLCPSwapInterval]; // set to vbl sync

	[self resetCamera];
	shapeSize = 7.0f; // max radius of of objects

	// init fonts for use with strings
	NSFont * font =[NSFont fontWithName:@"Helvetica" size:12.0];
	stanStringAttrib = [[NSMutableDictionary dictionary] retain];
	[stanStringAttrib setObject:font forKey:NSFontAttributeName];
	[stanStringAttrib setObject:[NSColor whiteColor] forKey:NSForegroundColorAttributeName];
	[font release];
	
	// ensure strings are created
	[self createHelpString];
	[self createMessageString];

}
// ---------------------------------

// this can be a troublesome call to do anything heavyweight, as it is called on window moves, resizes, and display config changes.  So be
// careful of doing too much here.
- (void) update // window resizes, moves and display changes (resize, depth and display config change)
{
msgTime	= getElapsedTime ();
[msgStringTex setString:[NSString stringWithFormat:@"update at %0.1f secs", msgTime]  withAttributes:stanStringAttrib];
	[super update];
	if (![self inLiveResize])  {// if not doing live resize
		[self updateInfoString]; // to get change in renderers will rebuld string every time (could test for early out)
	}
}

// ---------------------------------

-(id) initWithFrame: (NSRect) frameRect
{
   NSOpenGLPixelFormat *pf = [BasicOpenGLView basicPixelFormat];

   self = [super initWithFrame: frameRect pixelFormat: pf];
   return self;
}

// ---------------------------------

- (BOOL)acceptsFirstResponder
{
  return YES;
}

// ---------------------------------

- (BOOL)becomeFirstResponder
{
  return  YES;
}

// ---------------------------------

- (BOOL)resignFirstResponder
{
  return YES;
}

// ---------------------------------

- (void) awakeFromNib
{
   setStartTime (); // get app start time
	
   // set start values...
   fInfo = 1;
   fAnimate = 1;
   time = CFAbsoluteTimeGetCurrent ();  // set animation time start time
   fDrawHelp = 1;

   // start animation timer
   timer = [NSTimer timerWithTimeInterval:(1.0f/60.0f) target:self selector:@selector(animationTimer:) userInfo:nil repeats:YES];
   [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
   [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSEventTrackingRunLoopMode]; // ensure timer fires during resize
}


@end