//
//  ViewController.swift
//  BoxWalk
//
//  Created by MizushimaYusuke on 2/6/16.
//  Copyright © 2016 MizushimaYusuke. All rights reserved.
//

import UIKit
import SceneKit

class ViewController: UIViewController {

    weak var sceneView : SCNView?

    class Walk {
        var count = 0
        var positions = [SCNVector3(0, 0, 0), SCNVector3(x: -0.5, y: 0, z: 0.5), SCNVector3(x: -1.0, y: 0, z: 0), SCNVector3(x: -0.5, y: 0, z:-0.5)]
        var pivots = [SCNMatrix4MakeTranslation(0, -0.5, 0.5), SCNMatrix4MakeTranslation(-0.5, -0.5, 0), SCNMatrix4MakeTranslation(0, -0.5, -0.5), SCNMatrix4MakeTranslation(0.5, -0.5, 0)]
        var direction = [SCNVector3(x: 1, y: 0, z: 0), SCNVector3(x: 0, y: 0, z: 1), SCNVector3(x: -1, y: 0, z: 0), SCNVector3(x: 0, y: 0, z: -1)]
        func rotate(box : SCNNode) {
            box.runAction(SCNAction.rotateByAngle(CGFloat(M_PI) * 0.5, aroundAxis: direction[count], duration: 0.5), completionHandler: {
                self.count = ++self.count % 4
                box.transform = SCNMatrix4Identity
                box.pivot = self.pivots[self.count]
                box.position = self.positions[self.count]
            })
        }
    }
    var walk = Walk()

    override func viewDidLoad() {
        super.viewDidLoad()
        setupScene()
        createBase()
        createBox()
        createButton()
    }

    func setupScene() {
        let sv = SCNView(frame: view.bounds)
        sv.backgroundColor = UIColor.lightGrayColor()
        sv.scene = SCNScene()
        sv.autoenablesDefaultLighting = true
        sv.allowsCameraControl = true
        view.addSubview(sv)
        sceneView = sv
    }

    func createBase() {
        let base = SCNBox(width: 10, height: 1, length: 10, chamferRadius: 0)
        base.firstMaterial?.diffuse.contents = UIColor.brownColor()
        let node = SCNNode(geometry: base)
        node.position = SCNVector3(0, -0.5, 0)
        sceneView?.scene?.rootNode.addChildNode(node)
    }

    func createBox() {
        let box = SCNBox(width: 1, height: 1, length: 1, chamferRadius: 0)
        box.firstMaterial?.diffuse.contents = UIColor.yellowColor()
        let node = SCNNode(geometry: box)
        node.pivot = SCNMatrix4MakeTranslation(0, -0.5, 0.5)
        node.name = "box"
        sceneView?.scene?.rootNode.addChildNode(node)
    }

    func createButton() {
        let btn = UIButton(type: .System)
        btn.setTitle("Turn", forState: .Normal)
        btn.titleLabel?.font = UIFont.systemFontOfSize(40)
        btn.sizeToFit()
        btn.center = CGPoint(x: CGRectGetMaxX(view.bounds) - 150, y: CGRectGetMidY(view.bounds) - 150)
        view.addSubview(btn)
        btn.addTarget(self, action: "turn", forControlEvents: .TouchUpInside)
    }

    func turn() {
        if let box = sceneView?.scene?.rootNode.childNodeWithName("box", recursively: false) {
            walk.rotate(box)
        }
    }
}