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*/

#import "CubeGLView.h"

#import "CubeController.h"

#import <OpenGL/gl.h>

#import <OpenGL/glext.h>

#import <OpenGL/glu.h>

#import "Cube.h"

// Some simple vector utility routines ripped out of VectorLib.h.

static inline Vector MakeVector(float _x, float _y, float _z)

{

  Vector v;

  v.x = _x; v.y = _y; v.z = _z;

  return v;

}

static inline Vector SumVectors(Vector _a, Vector _b)

{

  _a.x += _b.x;

  _a.y += _b.y;

  _a.z += _b.z;

  return _a;

}

@implementation CubeGLView

- (id)initWithFrame:(NSRect)theFrame

{

    NSOpenGLContext *ctx;

    long swapInterval = 1;

    /* Create a GL context */

    self = [super initWithFrame:theFrame pixelFormat:[[NSApp delegate] sharedPixelFormat]];

    /* Replace OpenGL context with one of our own making.  This is required

       because NSOpenGLView currently doesn't have built in support for shared

       OpenGL contexts.  The other option would be to not use NSOpenGLView at

       all, but I'm being lazy. */

    [self clearGLContext];

    ctx = [[NSOpenGLContext alloc] initWithFormat:[[NSApp delegate] sharedPixelFormat]

        shareContext:[[NSApp delegate] sharedOpenGLContext]];       

    [self setOpenGLContext:ctx];

    [ctx release];

    if(self) {      

        _orientation = MakeVector(20.0f,45.0f,0.0f);

        [[self openGLContext] setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];

        [[NSNotificationCenter defaultCenter] addObserver:self

                            selector:@selector(cubeChanged:)

                            name:CubeDidChangeNotification object:nil];

    }

    return self;

}

- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

    [super dealloc];

}

- (void)cubeChanged:(NSNotification *)theNotification

{

    if([theNotification object] == [[NSApp delegate] cube])

        [self display];

}

- (BOOL)isOpaque

{

    return YES;

}

- (void)reshape

{

    sizeChanged = YES;

    [super reshape];

}

- (void)drawRect:(NSRect)theRect

{

    NSRect visibleRect;

    float lightModelAmbient[4] = {0.0f,0.0f,0.0f,1.0f};

    float light0Position[4] = {1.0f,1.0f,1.0f,1.0f};

    float light0Ambient[4] = {0.0f, 0.0f, 0.0f, 0.0f};

    float light0Diffuse[4] = {1.0f, 1.0f, 1.0f, 1.0f};

    float light0Specular[4] = {1.0f, 1.0f, 1.0f, 0.0f};

    // Get visible bounds...

    visibleRect = [self bounds];

    // Set proper viewport

    glViewport(visibleRect.origin.x, visibleRect.origin.y, 

               visibleRect.size.width, visibleRect.size.height);

    // Clear background to transparent black.

    glClearColor(0.0f,0.0f,1.0f,0.0f);

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    // Set up known GL render states.

    glDisable(GL_BLEND);

    glEnable(GL_DEPTH_TEST);

    glCullFace(GL_BACK);

    glEnable(GL_CULL_FACE);

    glEnable(GL_LIGHTING);

    glEnable(GL_LIGHT0);

    // Set GL lighting

    glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);

    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lightModelAmbient);

    glLightfv(GL_LIGHT0, GL_AMBIENT, light0Ambient);

    glLightfv(GL_LIGHT0, GL_DIFFUSE, light0Diffuse);

    glLightfv(GL_LIGHT0, GL_SPECULAR, light0Specular);

    // Set camera field of view, viewport aspect ratio and near/far clipping planes.

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    gluPerspective(30.0f, visibleRect.size.width / visibleRect.size.height, 1.0f,8192.0f);

    // Reset modelview matrix stack.

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    // Set up fixed light position.

    glLightfv(GL_LIGHT0, GL_POSITION, light0Position);

    // Back off from object position

    glTranslatef(0.0f,0.0f,-10.0f);

    glTranslatef(_position.x, _position.y, _position.z);

    // Do orientation.

    glRotatef(_orientation.z,0.0f,0.0f,1.0f);

    glRotatef(_orientation.x,1.0f,0.0f,0.0f);

    glRotatef(_orientation.y,0.0f,1.0f,0.0f);

    // Finally, draw the cube!

    [[[NSApp delegate] cube] draw];

    // This is an optimization.  If the view is being

    // resized, don't do a buffer swap.  The GL content

    // will be updated as part of the window flush anyway.

    // This makes live resize look nicer as the GL view

    // won't get flushed ahead of the window flush.  It also

    // makes live resize faster since we're not flushing twice.

    // Because I want the animtion to continue while resize

    // is happening, I use my own flag rather than calling

    // [self inLiveReize].  For most apps this wouldn't be

    // necessary.

    if(!sizeChanged)

        [[self openGLContext] flushBuffer];

    else

        glFlush();

    sizeChanged = NO;

}

- (BOOL)acceptsFirstResponder

{

    return YES;

}

- (BOOL)becomeFirstResponder

{

    return YES;

}

- (BOOL)resignFirstResponder

{   

    return YES;

}

- (void)mouseDown:(NSEvent *)theEvent

{

    BOOL special;

    float deltaX, deltaY;

    Vector result;

    while(1) {

        /* Wait for a single event.. */

        theEvent = [[self window] nextEventMatchingMask:

            (NSLeftMouseDraggedMask | NSLeftMouseUpMask)];

        special = (([theEvent modifierFlags] & NSAlternateKeyMask) ? YES : NO);

        deltaX = [theEvent deltaX];

        deltaY = [theEvent deltaY];

        if(special) {

            result.x = result.y = 0.0f;

            result.z = -deltaX * 0.5f;

        } else {

            result.x =  deltaY * 0.5f;

            result.y =  deltaX * 0.5f;

            result.z =  0.0f;

        }

        _orientation = SumVectors(_orientation, result);

        [self setNeedsDisplay:YES];

        if([theEvent type] == NSLeftMouseUp)

            break;

    }

}

- (void)keyDown:(NSEvent *)theEvent

{

    Cube *cube = [[NSApp delegate] cube];

    if([[theEvent characters] isEqual:@"L"])

        [cube performSequence:@"L-"];

    else if([[theEvent characters] isEqual:@"l"])

        [cube performSequence:@"L+"];

    else if([[theEvent characters] isEqual:@"R"])

        [cube performSequence:@"R-"];

    else if([[theEvent characters] isEqual:@"r"])

        [cube performSequence:@"R+"];

    else if([[theEvent characters] isEqual:@"T"])

        [cube performSequence:@"T-"];

    else if([[theEvent characters] isEqual:@"t"])

        [cube performSequence:@"T+"];

    else if([[theEvent characters] isEqual:@"B"])

        [cube performSequence:@"B-"];

    else if([[theEvent characters] isEqual:@"b"])

        [cube performSequence:@"B+"];

    else if([[theEvent characters] isEqual:@"F"])

        [cube performSequence:@"F-"];

    else if([[theEvent characters] isEqual:@"f"])

        [cube performSequence:@"F+"];

    else if([[theEvent characters] isEqual:@"P"])

        [cube performSequence:@"P-"];

    else if([[theEvent characters] isEqual:@"p"])

        [cube performSequence:@"P+"];

    else if([[theEvent characters] isEqual:@"X"])

        [cube performSequence:@"X-"];

    else if([[theEvent characters] isEqual:@"x"])

        [cube performSequence:@"X+"];

    else if([[theEvent characters] isEqual:@"Y"])

        [cube performSequence:@"Y-"];

    else if([[theEvent characters] isEqual:@"y"])

        [cube performSequence:@"Y+"];

    else if([[theEvent characters] isEqual:@"Z"])

        [cube performSequence:@"Z-"];

    else if([[theEvent characters] isEqual:@"z"])

        [cube performSequence:@"Z+"];

    else if([[theEvent characters] isEqual:@"s"])

        [cube performSequence:[cube solveCube]];

    [self setNeedsDisplay:YES];

}

- (void)undo:(NSEvent *)theEvent

{

    [[[NSApp delegate] undoManager] undo];

}

- (void)redo:(NSEvent *)theEvent

{

    [[[NSApp delegate] undoManager] redo];

}

@end