import UIKit
import SceneKit
import ARKit



class ViewController: UIViewController, ARSCNViewDelegate, SCNPhysicsContactDelegate {

    @IBOutlet var sceneView: ARSCNView!
    
    enum nesneTipi :Int {
        case mermi = 1
        case hedef = 2
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Set the view's delegate
        sceneView.delegate = self
        sceneView.scene.physicsWorld.contactDelegate = self
        //sceneView.debugOptions = [ARSCNDebugOptions.showWorldOrigin, ARSCNDebugOptions.showFeaturePoints]
        
        let tikla = UITapGestureRecognizer(target: self, action: #selector(tiklamaSonucu))
        sceneView.addGestureRecognizer(tikla)
        
        hedefEkle()
    }
    
    @objc func tiklamaSonucu(tiklama:UITapGestureRecognizer) {
        guard let ekran = tiklama.view as? ARSCNView else {return}
        guard let pov = ekran.pointOfView else {return}
        let transform = pov.transform
        
        let orientation = SCNVector3(-transform.m31, -transform.m32, -transform.m33)
        let lokasyon = SCNVector3(transform.m41, transform.m42, transform.m43)
        
        let pozisyon = SCNVector3(orientation.x + lokasyon.x, orientation.y + lokasyon.y, orientation.z + lokasyon.z)
        
        let mermi = SCNNode()
        mermi.name = "Mermi"
        mermi.geometry = SCNSphere(radius: 0.35)
        mermi.geometry?.firstMaterial?.diffuse.contents = UIColor.purple
        mermi.position = pozisyon
        mermi.physicsBody = SCNPhysicsBody(type: .dynamic, shape: SCNPhysicsShape(node: mermi, options: nil))
        mermi.physicsBody?.isAffectedByGravity = false
        mermi.physicsBody?.categoryBitMask = nesneTipi.mermi.rawValue
        mermi.physicsBody?.contactTestBitMask = nesneTipi.hedef.rawValue
        
        
        let kuvvet: Float = 50
        mermi.physicsBody?.applyForce(SCNVector3(orientation.x * kuvvet, orientation.y * kuvvet * (-2), orientation.z * kuvvet), asImpulse: true)
        
        sceneView.scene.rootNode.addChildNode(mermi)
        
    }
    
    func hedefEkle() {
        let piramid = SCNNode()
        piramid.name = "Piramid"
        piramid.geometry = SCNPyramid(width: 4, height: 4.5, length: 4)
        piramid.geometry?.firstMaterial?.diffuse.contents = UIColor.orange
        piramid.position = SCNVector3(-3,1,-15)
        piramid.physicsBody = SCNPhysicsBody(type: .static, shape: nil)
        piramid.physicsBody?.categoryBitMask = nesneTipi.hedef.rawValue
        
        sceneView.scene.rootNode.addChildNode(piramid)
        
        let simit = SCNNode()
        simit.name = "Simit"
        simit.geometry = SCNTorus(ringRadius: 2, pipeRadius: 0.5)
        simit.geometry?.firstMaterial?.diffuse.contents = UIColor.blue
        simit.position = SCNVector3(0,-2,-15)
        simit.physicsBody = SCNPhysicsBody(type: .static, shape: SCNPhysicsShape(node: simit, options: [SCNPhysicsShape.Option.type: SCNPhysicsShape.ShapeType.concavePolyhedron]))
        let doksanderece = GLKMathDegreesToRadians(90)
        simit.eulerAngles = SCNVector3(doksanderece,0,0)
        simit.physicsBody?.categoryBitMask = nesneTipi.hedef.rawValue
        sceneView.scene.rootNode.addChildNode(simit)
        
        let kutu = SCNNode()
        kutu.name = "Kutu"
        kutu.geometry = SCNBox(width: 3.5, height: 3.5, length: 3.5, chamferRadius: 0)
        kutu.geometry?.firstMaterial?.diffuse.contents = UIColor.green
        kutu.position = SCNVector3(5,1,-15)
        kutu.physicsBody = SCNPhysicsBody(type: .static, shape: nil)
        kutu.physicsBody?.categoryBitMask = nesneTipi.hedef.rawValue
        sceneView.scene.rootNode.addChildNode(kutu)
        
        
    }
    
    func physicsWorld(_ world: SCNPhysicsWorld, didBegin contact: SCNPhysicsContact) {
        var kaynakNode : SCNNode!
        
        if contact.nodeA.name == "Mermi" {
            kaynakNode = contact.nodeB
        } else {
            kaynakNode = contact.nodeA
        }
        
        switch kaynakNode.name {
            case "Piramid":
                kaynakNode.geometry?.firstMaterial?.diffuse.contents = UIColor.magenta
            case "Simit":
                kaynakNode.geometry?.firstMaterial?.diffuse.contents = UIColor.yellow
            case "Kutu":
                kaynakNode.geometry?.firstMaterial?.diffuse.contents = UIColor.red
            default:
                return
        }
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        // Create a session configuration
        let configuration = ARWorldTrackingConfiguration()

        // Run the view's session
        sceneView.session.run(configuration)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        // Pause the view's session
        sceneView.session.pause()
    }

}