#import "ViewController.h"
#import &ltQuartzCore/QuartzCore.h>

@interface ViewController ()
{
    NSMutableArray *posAry;
    NSMutableArray *stateAry;
    NSInteger tate,yoko,anum;
    UIView *myView;
}

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
    
    myView=[[UIView alloc]initWithFrame:CGRectMake(10, 100, 300, 300)];
    
    [self.view addSubview:myView];
    
    UIButton *rstbtn = [UIButton buttonWithType:UIButtonTypeCustom];
    rstbtn.layer.cornerRadius = 10.0f;
    rstbtn.frame = CGRectMake(230,30,70,30);
    [rstbtn addTarget:self action:@selector(reset) forControlEvents:UIControlEventTouchDown];
    [rstbtn setTitle:@"reset" forState:UIControlStateNormal];
    [rstbtn setTitleColor:[ UIColor blueColor] forState:UIControlStateNormal];
    rstbtn.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:rstbtn];
    
    self.view.userInteractionEnabled = YES;
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapView:)];
    [myView addGestureRecognizer:tap];
    
    [self createTile];
    [self reset];
}
-(void)createTile
{
   
    posAry=[NSMutableArray array];
    stateAry=[NSMutableArray array];
    
    for (int v = 0; v < 4; v++) {
        for (int h = 0; h < 4; h++) {

            CGPoint pos = CGPointMake((37+75*h),
                                        (37+75*v));
            NSValue *val = [NSValue valueWithCGPoint:pos];
            [posAry addObject:val];
            [stateAry addObject:[NSString stringWithFormat:@"%d",h+4*v]];
            }
    }
    anum=0;
    for (int i=0; i<16; i++) {
        CALayer *atile = [CALayer layer];// initWithFrame:CGRectMake(0, 0, 75, 75)];
        atile.frame=CGRectMake(0, 0, 75, 75);
        UILabel *tile=[[UILabel alloc]init];
        tile.frame=CGRectMake(0, 0, 75, 75);
        tile.backgroundColor = [UIColor cyanColor];
        tile.layer.borderWidth = 2.0;
        NSValue *value = [posAry objectAtIndex:i];
        CGPoint cp = [value CGPointValue];
        tile.text=[NSString stringWithFormat:@"%d",i];
        tile.textAlignment = 1;
        tile.font = [UIFont boldSystemFontOfSize:24];
        tile.center = cp;
        tile.tag=i+1;
        
        if (i==0) {
            tile.backgroundColor = [UIColor blackColor];
            tile.text=@"x";
            
        }
        atile.contents=tile;
        atile.position=cp;
        [myView addSubview:tile];
    }
    
}
- (void)tapView:(UITapGestureRecognizer*)gesture {
    
    
    CGPoint pos = [gesture locationInView:myView];
    NSInteger tilex=(pos.x)/75;
    NSInteger tiley=(pos.y)/75;
    NSInteger index=tiley*4+tilex;
    
    NSInteger atile=[[stateAry objectAtIndex:index]intValue];
    
    tate=anum%4;
    yoko=anum/4;
    NSValue *value = [posAry objectAtIndex:anum];
    CGPoint nilcp = [value CGPointValue];
    
    NSValue *exvalue = [posAry objectAtIndex:index];
    CGPoint excp = [exvalue CGPointValue];
    
    
    if (tate==index%4 || yoko==index/4) {
        if (abs(index-anum)==1|| abs(index-anum)==4) {
            UILabel *alabel=(UILabel* )[self.view viewWithTag: atile+1 ];
            alabel.center=nilcp;
            
            UILabel *nillabel=(UILabel* )[self.view viewWithTag: 1 ];
            nillabel.center=excp;
            
            [stateAry exchangeObjectAtIndex:index withObjectAtIndex:anum];
            anum=index;
            
        }
        
    }
    
}
- (void)reset{
    
    //シャッフル
    int i;
    stateAry=[NSMutableArray array];
    for (i=0; i<16; i++) {
        [stateAry addObject:[NSNumber numberWithInt:i]];
    }
    for (i=0; i<16*3; i++) {
        int index=random() % 16;
        id obj=[stateAry objectAtIndex:index];
        [stateAry removeObjectAtIndex:index];
        [stateAry addObject:obj];
        
    }
    for (i=0; i<16; i++) {
        NSInteger tile=[[stateAry objectAtIndex:i]intValue];
        
        
        NSValue *value = [posAry objectAtIndex:i];
        CGPoint cp = [value CGPointValue];
        
        UILabel *alabel=(UILabel* )[self.view viewWithTag: tile+1 ];
        if (tile==0) {
            anum=i;
        }
        alabel.center=cp;
    }
    
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end