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import SpriteKit
import GameplayKit

class GameScene: SKScene ,SKPhysicsContactDelegate{
    
    var moveAllowed = false /// 场景是否可以移动了;
    
    //MARK: - StateMachine 场景中各个舞台State
    lazy var stateMachine:GKStateMachine = GKStateMachine(states: [
        WaitingState(scene: self), //self 为 GameScene ,把GameScene专入State
        PlayState(scene: self),
        GameOverState(scene: self)
        ])
    
    //MARK: - 场景中的所有SpriteNode
    /*
     * 1.调用 Elements Class 的节点,须在GameScene的把节点的Custom Class设为PlayerNode
     * 2.Module 设为项目名称 SkyNinja
     * 3.为何要设置独立的class精灵,可以为GameScene减少代码,并有利于代码的复用;
     */
    var playerNode:PlayerNodeClass!
    var coinTempNode:SKSpriteNode!
    var bombTempNode:SKSpriteNode!
    var mainCamera:SKCameraNode!
    var groundNode:SKSpriteNode!    /// 地面
    var skyNode:SKSpriteNode!       /// 天空
    var spawnElements = SpawnElements() /// 生成节点工具 特别注意，这里非 spawnElements = SpawnElements!
    
    private var dt:TimeInterval = 0  /// 每一frame的时间差
    private var lastUpdateTimeInterval:TimeInterval = 0
    
    override func didMove(to view: SKView) {
        super.didMove(to: view)
        self.physicsWorld.gravity = CGVector(dx: 0, dy: -9.8)  /// 物理世界的重力
        self.physicsWorld.contactDelegate = self               /// 碰撞代理
        
        initCamera()   /// Camera
        initBgMusic()  /// 背景音乐
        initPlayer()   /// 初始化玩家
        initCoinBomb() /// 临时的Coin+Bomb
        initSkyGroundLine() // 建立物理天空+地面
        stateMachine.enter(WaitingState.self) /// 初始化以上的各个精灵SpriteNode后，再进入WaitingState 场景舞台State
    }
    //MARK: - 加入Camera
    func initCamera(){
        mainCamera = childNode(withName: "MainCamera") as! SKCameraNode
    }
    //MARK: - 移动Camera
    func moveCamera(){
        self.mainCamera.position.x += CAMERA_MOVE_XPOS ///向右移动
    }
    //MARK: - 停止Camera
    func stopCamera(){
        self.mainCamera.removeAllActions()
    }
    // MARK:-初始化玩家
    func initPlayer(){
        
        playerNode = childNode(withName: "Player") as! PlayerNodeClass
        playerNode.physicsBody?.affectedByGravity = true
        playerNode.initPlayer()
    }
    // MARK:-背景音乐
    func initBgMusic(){
        
        let bgMusic = SKAudioNode(fileNamed: "background.mp3")
        bgMusic.autoplayLooped = true
        addChild(bgMusic)
    }
    
    func initCoinBomb(){
        coinTempNode = childNode(withName: "CoinTemp") as! SKSpriteNode
        bombTempNode = childNode(withName: "BombTemp") as! SKSpriteNode
    }
    //MARK: - 物理线
    func initSkyGroundLine(){
        
        skyNode = childNode(withName: "Sky") as! SKSpriteNode
        let sykLine = LineNode()  /// 生成新的节点 比如 let newNode = SKNode()
        sykLine.initSkyLine(size: size, yPos: skyNode.position.y + 10)
        addChild(sykLine)
        
        
        groundNode = childNode(withName: "Ground") as! SKSpriteNode
        let groundLine = LineNode()
        groundLine.initGroundLine(size: size, yPos: groundNode.position.y + groundNode.size.height - 10)
        addChild(groundLine)
        
    }
    
    // MARK: - 反转物理世界;
    func reverseGravity(){
        physicsWorld.gravity *= -1
    }
    
    // MARK: - 根据 camera.position.x 移动所有页面元素;
    ///因为节点anchorPoint为(0,0)，且相机的初始位置为 1024,所以要把相机的位置扣除1024 即(camera.position.x - self.size.width / 2)
    func moveSprites(camera:SKCameraNode){
        /// 所有的天空精灵
        enumerateChildNodes(withName: "Sky") { (node, error) in
            if  node.position.x + self.size.width < (camera.position.x - self.size.width / 2) {
                node.position.x += self.size.width * SCENE_NUMBERS
            }
        }
        /// 所有的地面精灵;
        enumerateChildNodes(withName: "Ground") { (node, error) in
            if  node.position.x + self.size.width < (camera.position.x - self.size.width / 2 ) {
                node.position.x += self.size.width * SCENE_NUMBERS
            }
            /// print("所有的地面精灵",node.position.x,(camera.position.x - self.size.width / 2 ))
        }
        /// 所有线和Camera同步
        enumerateChildNodes(withName: "Line") { (node, error) in
            // let node = node as! SKNode
            node.position.x += CAMERA_MOVE_XPOS
            if  node.position.x < -self.size.width {
                node.position.x += self.size.width * SCENE_NUMBERS
            }
        }
        /// 所有树
        /// 树为何不：(camera.position.x - self.size.width / 2 ),请注意树的 anchorPoint(0.5,0.5)
        enumerateChildNodes(withName: "Tree") { (node, error) in
            if  node.position.x + self.size.width < (camera.position.x ) {
                node.position.x += self.size.width * SCENE_NUMBERS
            }
        }
        /// 所有背景
        enumerateChildNodes(withName: "Bg") { (node, error) in
            
            if  node.position.x + self.size.width < (camera.position.x - self.size.width / 2 ) {
                node.position.x += self.size.width * SCENE_NUMBERS
            }
        }
    }
    // MARK: - 生成节点工具 class
    @objc func spawnCoins(){
        /// print(spawnElements.spawnCoin(camera: mainCamera))
        if moveAllowed {
            self.addChild(spawnElements.spawnCoin(camera: mainCamera)) /// 传入主相机位置
        }
        
    }
    
    @objc func spawnBombs(){
        if moveAllowed {
            addChild(spawnElements.spawnBomb(camera: mainCamera,scene: self)) /// 传入主相机位置
        }
    }
    
    @objc func removeCoins(){
        enumerateChildNodes(withName: "coin") { (node, error) in
            if node.position.x < self.mainCamera.position.x - self.size.width {
                /// print("移除coin")
                node.removeFromParent()
            }
        }
    }
    // MARK: - 不再生成了;
    func stopSpawning(){
        
        playerNode.removeAction(forKey: "jogging")  /// 移除人物的运动;
        
        enumerateChildNodes(withName: "coin") { (node, error) in
            node.removeAllActions()
        }
        enumerateChildNodes(withName: "bomb") { (node, error) in
            node.removeAllActions()
        }
    }
    
    //MARK: - 重新开始游戏;
    func restartGame(){
        
        let newScene = GameScene(fileNamed: "GameScene")!
        newScene.size = CGSize(width: SCENE_WIDTH, height: SCENE_HEIGHT)
        newScene.anchorPoint = CGPoint(x: 0, y: 0)
        newScene.scaleMode   = .aspectFill
        let transition = SKTransition.flipHorizontal(withDuration: 0.5)
        view?.presentScene(newScene, transition:transition)
    }
    
    // MARK: - 监测屏幕点击事件
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        guard let touch = touches.first else {
            return
        }
        let touchLocation = touch.location(in: self) ///获得点击的位置
        /// 判断目前的GameScene场景舞台是哪个state
        switch stateMachine.currentState {
        case is WaitingState:
            /// 获得按钮的点击位置
            guard let body = physicsWorld.body(at: touchLocation) else {
                return
            }
            /// 判断是否是点击了PlayButton
            guard  let playButton = body.node?.childNode(withName: "PlayButton") as? SKSpriteNode else {
                return
            }
            /// 如果点击位置是在PlayButton
            if (playButton.contains(touchLocation)){
                playButton.isHidden = true
                stateMachine.enter(PlayState.self) /// 进入开始游戏;
            }
            
        case is PlayState:
            reverseGravity() /// 反转物理世界;
            
        case is GameOverState:
            
            guard let body = physicsWorld.body(at: touchLocation) else {
                return
            }
            // TapToPlay按钮;
            if let tapToPlay  = body.node?.childNode(withName: "tapToPlay"){
                
                if tapToPlay.contains(touchLocation){
                    print("重新开始游戏！")
                    restartGame()
                }
            }
            
        default:
            break;
            
            
        }
    }
    // MARK: - 监测碰撞
    func didBegin(_ contact: SKPhysicsContact) {
        
        let bodyA:SKPhysicsBody
        let bodyB:SKPhysicsBody
        if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
            bodyA = contact.bodyA
            bodyB = contact.bodyB
        }else{
            bodyA = contact.bodyB
            bodyB = contact.bodyA
        }
        ///检测碰到中间线
        if bodyA.categoryBitMask == PhysicsCategory.Player && bodyB.categoryBitMask == PhysicsCategory.MiddleLine {
            /// print("碰到屏幕线人物反转")
            playerNode.reversePlayer() 
        }
        
        ///检测碰到coin
        if bodyA.categoryBitMask == PhysicsCategory.Player && bodyB.categoryBitMask == PhysicsCategory.Coin {
            /// print("碰到屏幕线人物反转")
            let coinAction = SKAction.playSoundFileNamed("coin.wav", waitForCompletion: false)
            run(coinAction)
            bodyB.node?.removeFromParent()
        }
        
        ///检测碰到Bomb
        if bodyA.categoryBitMask == PhysicsCategory.Player && bodyB.categoryBitMask == PhysicsCategory.Bomb {
            /// 播放音乐
            let bombAction = SKAction.playSoundFileNamed("ninjaHit.wav", waitForCompletion: false)
            run(bombAction)
            /// 移除BOMB
            /// bodyB.node?.removeFromParent()
            stateMachine.enter(GameOverState.self)
        }
        
    }
    // MARK: - 时时更新update
    override func update(_ currentTime: TimeInterval) {
        
        /// 获取时间差
        if lastUpdateTimeInterval == 0 {
            lastUpdateTimeInterval = currentTime
        }
        dt = currentTime - lastUpdateTimeInterval
        lastUpdateTimeInterval = currentTime
        
        stateMachine.update(deltaTime: dt)  /// 把update传进各个State里;
    }
}