//
//  ViewController.m
//  JellyFish
//
//  Created by MizushimaYusuke on 2017/07/23.
//  Copyright © 2017 MizushimaYusuke. All rights reserved.
//

#import "ViewController.h"
@import SpriteKit;

@interface ViewController ()
@property (nonatomic, weak) SKScene *scene;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupScene];
    [self createJellyFish];
}

- (void)setupScene {
    SKView *sv = [[SKView alloc] initWithFrame:self.view.bounds];
    SKScene * s = [SKScene sceneWithSize:sv.frame.size];
    [sv presentScene:s];
    [self.view addSubview:sv];
    self.scene = s;
}

-(void)createJellyFish {
    UIColor *color = [UIColor colorWithHue:0.5 saturation:0.1 brightness:1 alpha:1];
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(100, 60), NO, 0);
    [color set];
    CGContextFillEllipseInRect(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, 100, 100));
    CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeClear);
    CGContextFillEllipseInRect(UIGraphicsGetCurrentContext(), CGRectMake(20, 45, 5, 5));
    CGContextFillEllipseInRect(UIGraphicsGetCurrentContext(), CGRectMake(75, 45, 5, 5));
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    SKTexture *texture = [SKTexture textureWithImage:img];
    SKSpriteNode *jellyHead = [SKSpriteNode spriteNodeWithTexture:texture];
    jellyHead.name = @"head";
    jellyHead.position = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds));
    jellyHead.physicsBody = [SKPhysicsBody bodyWithTexture:texture size:texture.size];
    jellyHead.physicsBody.pinned = YES;
    [self.scene addChild:jellyHead];

    float x = jellyHead.position.x - 40;
    for (int j=0; j<5; j++) {
        SKNode *previous = jellyHead;
        float y = jellyHead.position.y - 40;
        for (int i=0; i<4; i++) {
            SKSpriteNode *tentacle = [SKSpriteNode spriteNodeWithColor:color size:CGSizeMake(4, 20)];
            tentacle.position = CGPointMake(x, y);
            [self.scene addChild:tentacle];
            tentacle.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:tentacle.size];
            SKPhysicsJointPin *pin = [SKPhysicsJointPin jointWithBodyA:previous.physicsBody bodyB:tentacle.physicsBody anchor:CGPointMake(x, y + 10)];
            [self.scene.physicsWorld addJoint:pin];

            y -= 20;
            previous = tentacle;
        }
        x += 20;
    }
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    SKNode *head = [self.scene childNodeWithName:@"head"];
    [head.physicsBody applyTorque:0.3];

}

@end