/*

     File: WormView.m

 Abstract: Implements the basic view class for the WormView. Various subclasses show off varying degrees of optimizations.

  Version: 1.2

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#import "WormView.h"

#define MAX_WORM_LENGTH 1000

#define WIDTH_QUANTUM 22

#define HEIGHT_QUANTUM 22

#define DEFAULT_LENGTH 19

@implementation WormView

- (id)initWithFrame:(NSRect)frame {

    self = [super initWithFrame:frame];

    if (self) {

        srandom((int)time(NULL));

        wormPositions = malloc(MAX_WORM_LENGTH * sizeof(GamePosition));

        wormTextAttributes = [[NSDictionary alloc] initWithObjectsAndKeys:

            [NSFont boldSystemFontOfSize:16.0], NSFontAttributeName, 

            nil];

        backgroundColor = [[NSColor colorWithPatternImage:[NSImage imageNamed:@"Background Pattern"]] copy];

        [self setString:NSLocalizedString(@"Default Worm String", "The string to be used for the worm's body")];

        [self setInitialLength:DEFAULT_LENGTH];

        [self setDesiredFrameRate:5000.0f];

        [self reset];

    }

    return self;

}

- (void)dealloc {

    [self stop:YES];

    [wormString release];

    [wormTextAttributes release];

    [backgroundColor release];

    [super dealloc];

}

// Manage the score

- (NSInteger)score {

    return score;

}

- (void)setScore:(NSInteger)newScore {

    score = newScore;

    [controller scoreChanged:self];

}

// Managing the controller

- (void)setController:(WormController *)obj {

    controller = obj;

}

- (WormController *)controller {

    return controller;

}

// Set/get the string which makes up the worm's body

- (void)setString:(NSString *)string {

    if (string != wormString) {

        [wormString release];

        wormString = [[string uppercaseString] copy];

    }

}

- (NSString *)string {

    return [[wormString retain] autorelease];

}

// Called once for each frame of the animation

- (BOOL)performAnimation {

    BOOL gameOverFlag;

    gameOverFlag = [self updateState];

    [self setNeedsDisplay:YES];

    return gameOverFlag;

}

// Draw the game area, worm, and target

- (void)drawRect:(NSRect)rect {

    NSUInteger i;

    NSRect tRect;

    [backgroundColor set];

    NSRectFill([self bounds]);

    for (i = 0; i < wormLength; i++) {

        NSRect wRect = [self rectForPosition:wormPositions[i]];

        NSUInteger characterIndex = i % [wormString length];

        NSString *string = [wormString substringWithRange:NSMakeRange(characterIndex, 1)];

        [string drawInRect:wRect withAttributes: wormTextAttributes];

    }

    tRect = [self rectForPosition:targetPosition];

    [[NSColor blackColor] set];

    [[NSBezierPath bezierPathWithOvalInRect:NSInsetRect(tRect, 2, 2)] fill];

}

// Coordinates are based on top left corner

- (BOOL)isFlipped {

    return YES;

}

// On click, become first responder

- (BOOL)acceptsFirstResponder {

    return YES;

}

// Keyboard handling

- (void)keyDown:(NSEvent *)event {

    NSString *keys = [event charactersIgnoringModifiers];

    wormHeading = kGameHeadingStraight;

    if (keys && [keys length] > 0) {

        unichar c = [keys characterAtIndex:0];

        if (c == NSLeftArrowFunctionKey) {

            wormHeading = kGameHeadingLeft;

        } else if (c == NSRightArrowFunctionKey) {

            wormHeading = kGameHeadingRight;

        }

    }

}

- (void)setInitialLength:(NSUInteger)length {

    initialWormLength = (length > 1) ? length : 1;

}

- (void)setDesiredFrameRate:(float)rate {

    desiredFrameRate = (rate > 0) ? rate : 1.0f;

    if (wormTimer) [self start];

}

- (float)desiredFrameRate {

    return desiredFrameRate;

}

- (float)actualFrameRate {

    return actualFrameRate;

}

- (BOOL)autoturnAtWalls {

    return YES;

}

- (void)stampTime {

    CFAbsoluteTime time = CFAbsoluteTimeGetCurrent();

    if (time > timeStamp) {

        actualFrameRate = (float) (actualFrameRate + 1.0f / (time - timeStamp)) / 2.0f;

    }

    timeStamp = time;

}

void wormTimerCallBack(CFRunLoopTimerRef timer, void *info) {

    WormView *self = (WormView *)info;

    CFAbsoluteTime startTime = CFAbsoluteTimeGetCurrent();

    BOOL gameOverFlag = [self performAnimation];

    [self displayIfNeeded];

    [self stampTime];

    if (gameOverFlag) {

        [self stop:YES];

    } else {

        CFRunLoopTimerSetNextFireDate(timer, startTime + CFRunLoopTimerGetInterval(timer));

    }

}

- (void)start {

    if (gameOver) [self reset];

    gameOver = NO;

    if (!wormTimer) {

        CFRunLoopTimerContext context = {0, self, NULL, NULL, NULL};

        timeStamp = CFAbsoluteTimeGetCurrent();

        wormTimer =  CFRunLoopTimerCreate(NULL, timeStamp, 1.0/[self desiredFrameRate], 0, 0, wormTimerCallBack, &context);

        CFRunLoopAddTimer(CFRunLoopGetCurrent(), wormTimer, kCFRunLoopCommonModes);

        [controller gameStatusChanged:self];

    }

}

- (void)stop:(BOOL)flag {

    if (!gameOver && flag) gameOver = YES;

    if (wormTimer) {

        CFRunLoopTimerInvalidate(wormTimer);

        CFRelease(wormTimer);

        wormTimer = NULL;

        [controller gameStatusChanged:self];

    }

}

- (BOOL)gameIsRunning {

    return wormTimer != NULL;

}

- (BOOL)gameIsOver {

    return gameOver;

}

- (BOOL)updateState {

    NSSize size = [self bounds].size;

    NSUInteger width = size.width / WIDTH_QUANTUM, height = size.height / HEIGHT_QUANTUM;

    GameState state = worm_guts(wormPositions, (unsigned long *)&wormLength, &wormDirection, &wormHeading, &targetPosition, width > 0 ? width : 1, height > 0 ? height : 1, [self autoturnAtWalls] ? 0 : 1);

    if (state == kGameStateScore) [self setScore:score + 1];

    return (state == kGameStateCrash);

}

- (NSRect)rectForPosition:(GamePosition)position {

    return NSMakeRect(position.x * WIDTH_QUANTUM, position.y * HEIGHT_QUANTUM, WIDTH_QUANTUM, HEIGHT_QUANTUM);

}

- (NSRect)integralRectForRect:(NSRect)rect {

    NSRect scaleRect = NSIntegralRect(NSMakeRect(rect.origin.x / WIDTH_QUANTUM, rect.origin.y / HEIGHT_QUANTUM, rect.size.width / WIDTH_QUANTUM, rect.size.height / HEIGHT_QUANTUM));

    return NSMakeRect(scaleRect.origin.x * WIDTH_QUANTUM, scaleRect.origin.y * HEIGHT_QUANTUM, scaleRect.size.width * WIDTH_QUANTUM, scaleRect.size.height * HEIGHT_QUANTUM);

}

- (void)reset {

    NSUInteger i;

    [self stop:NO];

    wormLength = initialWormLength - 1;

    for (i = 0; i < wormLength; i++) {

        wormPositions[i].x = -1;

        wormPositions[i].y = 0;

    }

    targetPosition.x = -1;

    targetPosition.y = 0;

    wormDirection = kGameDirectionEast;

    wormHeading = kGameHeadingStraight;

    actualFrameRate = 0.0f;

    [self setScore:0];

    [self setNeedsDisplay:YES];

}

@end