/*

     File: GamePiece.m

 Abstract: The mostly abstract superclass of all objects in the game.

  Version: 1.0

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 */

#import "GamePiece.h"

#import "Game.h"

@implementation GamePiece

/* Designated initializer for GamePiece

*/

- (id)initInGame:(Game *)g image:(NSImage *)frames numFrames:(NSInteger)nf numPoses:(NSInteger)np cache:(BOOL)cacheFlag {

    self = [super init];

    game = g;

    numImages = nf;

    numPoses = np;

    curImage = 0;

    curPose = 0;

    pos = NSZeroRect;

    vel = NSZeroSize;

    acc = NSZeroSize;

    if (frames != nil) {

    images = frames;

    NSSize imageSize = [images size];

        // Frames are vertically stacked, poses are horizontally stacked...

        [self setSize:NSMakeSize(imageSize.width / numPoses, imageSize.height / numImages)];

    if (cacheFlag) [[self class] cacheImage:images];

    }

    [self setPerFrameTime:DEFAULTPERFRAMETIME];

    aliveUntil = 0;     // This value indicates the object will not die

    return self;

}

- (id)initInGame:(Game *)g image:(NSImage *)frames numFrames:(NSInteger)nf numPoses:(NSInteger)np {

    return [self initInGame:g image:frames numFrames:nf numPoses:np cache:YES];

}

- (id)initInGame:(Game *)g imageName:(NSString *)imageName numFrames:(NSInteger)nf numPoses:(NSInteger)np {

    return [self initInGame:g image:[NSImage imageNamed:imageName] numFrames:nf numPoses:np];

}

- (id)initInGame:(Game *)g imageName:(NSString *)imageName numFrames:(NSInteger)nf {

    return [self initInGame:g imageName:imageName numFrames:nf numPoses:1];

}

- (id)initInGame:(Game *)g {

    return [self initInGame:g image:nil numFrames:1 numPoses:1 cache:YES];

}

- (void)setSize:(NSSize)newSize {

    pos = NSMakeRect(pos.origin.x, pos.origin.y, newSize.width, newSize.height);

}

- (void)setLocation:(NSPoint)newLocation {

    pos = NSMakeRect(newLocation.x, newLocation.y, pos.size.width, pos.size.height);

}

- (void)setPerFrameTime:(NSInteger)time {

    [self setPerFrameTime:time takeEffectNow:YES];

}

- (void)setPerFrameTime:(NSInteger)time takeEffectNow:(BOOL)nowFlag {

    perFrameTime = time;

    if (nowFlag) nextFrameTime = [game updateTime] + perFrameTime;

}

- (NSPoint)location {

    return pos.origin;

}

- (NSSize)size {

    return pos.size;

}

- (NSRect)rect {

    return pos;

}

- (void)reverseVelocity {

    NSSize newVel = NSMakeSize(-vel.width, -vel.height);

    [self setVelocity:newVel];

}

- (void)setVelocity:(NSSize)newVel {

    vel = newVel;

}

- (NSSize)velocity {

    return vel;

}

- (void)setAcceleration:(NSSize)newAcc {

    acc = newAcc;

}

- (NSSize)acceleration {

    return acc;

}

- (void)setTimeToExpire:(NSInteger)time {

    aliveUntil = [game updateTime] + time;

}

- (void)frameChanged {

}

- (BOOL)touches:(GamePiece *)obj {

    return (obj != nil && obj != self && [obj touchesRect:pos]);

}

+ (BOOL)intersectsRects:(NSRect)a :(NSRect)b {

    if (a.size.width == 0 || a.size.height == 0) return NO;

    if (b.size.width == 0 || b.size.height == 0) return NO;

    if (a.origin.x >= NSMaxX(b)) return NO;

    if (b.origin.x >= NSMaxX(a)) return NO;

    if (a.origin.y >= NSMaxY(b)) return NO;

    if (b.origin.y >= NSMaxY(a)) return NO;

    return YES;

}

- (BOOL)touchesRect:(NSRect)rect {

    return [GamePiece intersectsRects:pos :rect];

}

- (BOOL)isWithin:(CGFloat)dist ofPiece:(GamePiece *)obj {   // Horizontal proximity

    if (obj == nil) return NO;

    NSRect objRect = [obj rect];

    return (pos.origin.x - dist < NSMaxX(objRect)) && (NSMaxX(pos) + dist > objRect.origin.x);

}

- (BOOL)isInFrontAndWithin:(CGFloat)dist ofPiece:(GamePiece *)obj {

    if (obj == nil) return NO;

    NSRect objRect = [obj rect];

    return (pos.origin.x - dist < NSMaxX(objRect)) && (NSMaxX(pos) > objRect.origin.x);

}

- (BOOL)isInBackAndWithin:(CGFloat)dist ofPiece:(GamePiece *)obj {

    if (obj == nil) return NO;

    NSRect objRect = [obj rect];

    return (objRect.origin.x - NSMaxX(pos) < dist) && (NSMaxX(objRect) > pos.origin.x);

}

- (BOOL)isInFrontAndBetween:(CGFloat)farDist and:(CGFloat)nearDist ofPiece:(GamePiece *)obj {

    if (obj == nil) return NO;

    NSRect objRect = [obj rect];

    return (pos.origin.x - farDist < NSMaxX(objRect)) && (NSMaxX(pos) > objRect.origin.x + nearDist);

}

- (void)updatePiece {

    NSInteger updateTime = [game updateTime];

    NSInteger t = [game elapsedTime];

    if (t > 0) {

    if (aliveUntil > 0 && updateTime > aliveUntil) {

        [game removeGamePiece:self];

        return;

    }

    // Check to see if its time to jump to the next frame.

    if (images != nil && (updateTime > nextFrameTime)) {

            nextFrameTime = [Game maxInt:nextFrameTime + perFrameTime :updateTime + perFrameTime / 2];

        curImage = (curImage + 1) % numImages;

        [self frameChanged];

    }

    // Determine new velocity & location

    NSSize oldVel = vel;

        NSSize curAcc = [self acceleration];    // Due to goofiness in helicopter's implementation...

        CGFloat timeInSeconds = [Game timeInSeconds:t];

        if (curAcc.width != 0.0 || curAcc.height != 0.0) {  // Avoid creating a Size

            [self setVelocity:NSMakeSize(vel.width + curAcc.width * timeInSeconds, vel.height + curAcc.height * timeInSeconds)];

        }

        if (oldVel.width != 0.0 || oldVel.height != 0.0 || vel.width != 0.0 || vel.height != 0.0) { // Avoid creating a Point

            [self setLocation:NSMakePoint(pos.origin.x + 0.5 * (oldVel.width + vel.width) * timeInSeconds, pos.origin.y + 0.5 * (oldVel.height + vel.height) * timeInSeconds)];

        }

    }

}

- (BOOL)isVisibleIn:(NSRect)rect {

    return [GamePiece intersectsRects:rect :pos];

}

- (void)draw:(NSRect)gameRect {

    if ([self isVisibleIn:gameRect] && images != nil) {

        NSRect fromRect = NSMakeRect(pos.size.width * curPose, pos.size.height * curImage, pos.size.width, pos.size.height);

    NSPoint toPoint = NSMakePoint(floor(pos.origin.x - gameRect.origin.x), floor(pos.origin.y - gameRect.origin.y));

    [images drawAtPoint:toPoint fromRect:fromRect operation:NSCompositeSourceOver fraction:1.0];

    }

}

- (void)explode {

    [self explode:nil];

}

/* Redeclared here to allow overriding...

*/

- (void)playExplosionSound {

    [game playExplosionSound];

}

- (void)explode:(GamePiece *)explosion {

    if (explosion != nil) {

    NSSize explosionSize = [explosion size];

    NSPoint loc = [self location];

    [self playExplosionSound];

    loc.x = pos.origin.x - (explosionSize.width - pos.size.width) / 2;

    loc.y = pos.origin.y - (explosionSize.height - pos.size.height) / 2;

    [explosion setVelocity:vel];

    [explosion setLocation:loc];

    [game addGamePiece:explosion];

    }

    [game removeGamePiece:self];

}

- (NSInteger)pieceType {

    return MobileEnemyPiece;

}

- (void)flyTowardsPiece:(GamePiece *)obj smart:(BOOL)smart {

    NSRect objRect = [obj rect];

    if (smart) {

        NSSize objVel = [obj velocity];

        objRect = NSMakeRect(objRect.origin.x + (objVel.width * 0.6), objRect.origin.y + (objVel.height * 0.4), objRect.size.width, objRect.size.height);

    }

    NSSize velVector = NSMakeSize(NSMidX(objRect) - pos.origin.x, NSMidY(objRect) - pos.origin.y);

    CGFloat mag = sqrt(velVector.width * velVector.width + velVector.height * velVector.height);

    CGFloat speed = sqrt(vel.width * vel.width + vel.height * vel.height);

    velVector.width = velVector.width * speed / mag;

    velVector.height = velVector.height * speed / mag;

    [self setVelocity:velVector];

}

// This method allows pieces to fire (shoot) other pieces

// bullet should already be created but not initted

// fireFrom specifies the offset to fire from; firefrom == FireFromMiddlePoint mean fire from middle

- (void)fireBullet:(GamePiece *)bullet speed:(CGFloat)speed towardsPiece:(GamePiece *)obj smart:(BOOL)smart from:(NSPoint)fireFrom {    

    NSSize newVel = NSMakeSize(speed, 0.0);

    NSPoint bulletLoc;

    bullet = [bullet initInGame:game];

    if (!NSEqualPoints(fireFrom, FireFromMiddlePoint)) {    // If firing location specified, fire from there

    bulletLoc = NSMakePoint(pos.origin.x + fireFrom.x, pos.origin.y + fireFrom.y);

    } else {        // else fire from the middle

    NSSize bulletSize = [bullet size];

    bulletLoc = NSMakePoint(NSMidX(pos) - bulletSize.width / 2.0, NSMidY(pos) - bulletSize.height / 2.0);

    }

    [bullet setLocation:bulletLoc];

    [bullet setVelocity:newVel];

    [game addGamePiece:bullet];

    [game playEnemyFireSound];

    [bullet flyTowardsPiece:obj smart:smart];

}

// Hold images which have been explicitly cached...

+ (void)cacheImage:(NSImage *)image {

    static NSMutableSet *cachedImages = nil;

    if (!cachedImages) cachedImages = [[NSMutableSet alloc] init];

    if (![cachedImages containsObject:image]) {

        [image lockFocus];

        [image unlockFocus];

        [cachedImages addObject:image];

    }

}

+ (void)cacheImageNamed:(NSString *)imageName {

    NSImage *image = [NSImage imageNamed:imageName];

    if (image == nil) {

    NSLog(@"Bad image to cache %@", imageName);

    } else {

    [self cacheImage:image];

    }

}

@end