#include <Foundation/Foundation.h>
#include <objc/Object.h>
#include <objc/objc.h>
#include <stdio.h>

@interface Hello : NSObject
+ (instancetype)new;
- (void)sayHello;
@end

@implementation Hello 

+ (instancetype)new {
	return [[self alloc] init];
}

- (void)sayHello {
	printf("Hello from Objective-C!\n");
}

@end

@interface ExtendedHello: Hello
- (void)sayHello;
- (void)baldNiko;
@end

@implementation ExtendedHello

- (void)baldNiko {
	printf("67 67 bald niko 67\n");
}

- (void)sayHello {
	[super sayHello];
	[self baldNiko];
}

@end

@interface DoubleExtendedHello: ExtendedHello
- (void)baldNiko;
@end

@implementation DoubleExtendedHello

- (void)baldNiko {
	printf("bald niko with CHEESE !!!\n");
}

@end

@interface Player : NSObject {
	int x;
	int y;
	NSString *name;
}

- (instancetype)init;
- (void)setX:(int)x;
- (void)setY:(int)y;
- (void)setName:(NSString *)name;
- (void)sayHi;
+ (int)playerCount;
@end

@implementation Player 

static int playerCount = 0;

- (instancetype)init {
	self = [super init];
	if (self) {
		x = 0;
		y = 0;
		name = @"Player";
		playerCount++;
	}

	return self;
}

- (void)setX:(int)val {
	x = val;
}

- (void)setY:(int)val {
	y = val;
}

- (void)setName:(NSString *)val {
	name = val;
}

- (void)sayHi {
	printf("Hello, I'm %s, and I am at X: %d, Y: %d!\n", [name UTF8String], x, y);
}

+ (int)playerCount {
	return playerCount;
}

@end

@interface PlayerObserver : NSObject 
@end

@implementation PlayerObserver

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void*)context {
	 NSLog(@"PlayerObserver: %@ changed!", keyPath);
	 NSLog(@"Old: %@", [change objectForKey:NSKeyValueChangeOldKey]);
	 NSLog(@"New: %@", [change objectForKey:NSKeyValueChangeNewKey]);
}

@end

int main(void) {
	@autoreleasepool {
		Hello *hello = [Hello new];
		[hello sayHello];

		NSString *string = @"Test\n";
		NSLog(@"%@", string);

		ExtendedHello *ehello = [ExtendedHello new];
		[ehello sayHello];

		DoubleExtendedHello *dehello = [DoubleExtendedHello new];
		[dehello sayHello];

		Player *player = [Player new];
		[player setName:@"John Hackclub"];
		[player setX:27];
		[player setY:538];
		[player sayHi];
		printf("player count: %d\n", [Player playerCount]);
		Player *player2 = [Player new];
		[player2 setName:@"French Hacker"];
		[player2 setX:67];
		[player2 setY:41];
		[player2 sayHi];
		printf("player count: %d\n", [Player playerCount]);

		NSArray *people = @[
			@"John Smith",
			@"Jane Doe",
			@"John Hackclub",
			@"French Hacker",
			@"Zach Latta"
		];

		NSLog(@"%@", people);

		NSArray *players = @[
			@{@"name": @"French Hacker", @"score": @538},
			@{@"name": @"Arslaan", @"score": @53827},
			@{@"name": @"John Hackclub", @"score": @120}
		];

		NSPredicate *highScore = [NSPredicate predicateWithFormat:@"score > 300"];

		NSArray *filtered = [players filteredArrayUsingPredicate:highScore];

		NSLog(@"All players: %@", players);
		NSLog(@"High scorers (score > 300): %@", filtered);

		Player *player3 = [Player new];
		PlayerObserver *observer = [PlayerObserver new];

		[player3 addObserver:observer forKeyPath:@"name" options:NSKeyValueObservingOptionOld|NSKeyValueObservingOptionNew context:NULL];
		[player3 setName:@"Arslaan"];
		[player3 setName:@"Arslaan Pathan"];

		[player3 removeObserver:observer forKeyPath:@"name" context:NULL];

		[player release];
		[player2 release];
		[observer release];
		[player3 release];
		[hello release];
		[ehello release];
		[dehello release];

		return 0;
	}
}