private let Cell_ID = "mutlCollectionViewCell_ID"

class MultCollectionVC: UIViewController {
    
    lazy var mutlCollectionView: UICollectionView = {
        let flowLayout = UICollectionViewFlowLayout.init()
        flowLayout.itemSize = CGSize.init(width: 90, height: 90)
        flowLayout.scrollDirection = UICollectionView.ScrollDirection.vertical
        flowLayout.minimumLineSpacing = 10
        flowLayout.minimumInteritemSpacing = 10
        
        let mutlCollectionView = UICollectionView.init(frame: CGRect.zero, collectionViewLayout: flowLayout)
        mutlCollectionView.showsVerticalScrollIndicator = false
        mutlCollectionView.showsHorizontalScrollIndicator = false
        mutlCollectionView.delegate = self
        mutlCollectionView.dataSource = self
        mutlCollectionView.register(MutlCollectionCell.self, forCellWithReuseIdentifier: Cell_ID)
        
        mutlCollectionView.backgroundColor = .cyan
        
        return mutlCollectionView
    }()
    
    lazy var models: Array<MutlCollectionViewModel> = {
        let models = MutlCollectionViewModel.getModelList()
        return models
    }()
    
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        self.mutlCollectionView.frame = CGRect.init(x: 0, y: 0, width: kScreenWidth, height: kScreenHeight)
        self.view.addSubview(self.mutlCollectionView)
        
        
        createBarButtonItems()
        
    }
    func createSubViews() {
        
    }
    func createBarButtonItems() {
        let btn = UIButton(type: UIButton.ButtonType.custom)
        btn.frame = CGRect.init(x: 0, y: 0, width: 60, height: 45)
        btn.setTitle("编辑", for: UIControl.State.normal)
        btn.setTitleColor(UIColor.blue, for: UIControl.State.normal)
        btn.addTarget(self, action: #selector(btnAction), for: UIControl.Event.touchUpInside)
        //self.navigationController?.navigationBar.addSubview(btn)
        let rightBarButtonItem = UIBarButtonItem(customView: btn)
        
        //let rightBarButtonItem1 = UIBarButtonItem(title: "哈哈", style: UIBarButtonItem.Style.plain, target: self, action: #selector(btnAction))
        
        
        self.navigationItem.rightBarButtonItem = rightBarButtonItem
    }
    @objc func btnAction(sender: UIButton) {
        print(sender)
        self.mutlCollectionView.allowsMultipleSelection = true
    }
    

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
    }
    */

}

extension MultCollectionVC: UICollectionViewDataSource, UICollectionViewDelegate {
    // MARK: - UICollectionViewDataSource
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.models.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Cell_ID, for: indexPath) as!
        MutlCollectionCell
        
        let model = self.models[indexPath.item]
        cell.titleLabel.text = model.title
        cell.subTitleLabel.text = model.subTitle
        cell.closeButton.tag = indexPath.item
        cell.btnBlcok = { (sender: UIButton) in
            
            let tag = sender.tag
            print("sender = \(tag)")
            let clickModel = self.models[tag]
            clickModel.isEdit = true
            let clickIndexP = IndexPath(item: tag, section: 0)
            self.models.remove(at: tag)
            
            collectionView.reloadData()
            //collectionView.reloadItems(at: [clickIndexP])
        }
        
        return cell
    }
    
    // MARK: UICollectionViewDelegate
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        collectionView.deselectItem(at: indexPath, animated: true)
        print("indexPath = \(indexPath)")
    }
    
    func collectionView(_ collectionView: UICollectionView, canMoveItemAt indexPath: IndexPath) -> Bool {
        return true
    }
    
    
    
    
}



class MutlCollectionCell: UICollectionViewCell {
    
    // block 点击
    typealias BtnBlcok = ((_ sender: UIButton)->())
    var btnBlcok: BtnBlcok?
    
    
    lazy var titleLabel: UILabel = {
        let titleLabel = UILabel.init()
        titleLabel.textAlignment = .center
        titleLabel.textColor = .systemBlue
        titleLabel.backgroundColor = .gray
        return titleLabel
    }()
    lazy var subTitleLabel: UILabel = {
        let subTitleLabel = UILabel.init()
        subTitleLabel.textAlignment = .center
        subTitleLabel.textColor = .systemBlue
        subTitleLabel.backgroundColor = .lightGray
        return subTitleLabel
    }()
    
    lazy var closeButton: UIButton = {
        let closeButton = UIButton(type: UIButton.ButtonType.custom)
        //closeButton.frame = CGRect.init(x: 0, y: 0, width: 60, height: 45)
        closeButton.setTitle("x", for: UIControl.State.normal)
        closeButton.setTitleColor(UIColor.blue, for: UIControl.State.normal)
        closeButton.addTarget(self, action: #selector(btnAction), for: UIControl.Event.touchUpInside)
        return closeButton
    }()
    
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        createSubViews()
        
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func createSubViews() {
        self.backgroundColor = .orange
        self.contentView.addSubview(titleLabel)
        self.contentView.addSubview(subTitleLabel)
        self.contentView.addSubview(closeButton)
        
        
        titleLabel.frame = CGRect.init(x: 0, y: 0, width: 90, height: 30)
        subTitleLabel.frame = CGRect.init(x: 0, y: 40, width: 90, height: 30)
        
        closeButton.frame = CGRect.init(x: 60, y: 0, width: 30, height: 30)
        
    }
    
    @objc func btnAction(sender: UIButton) {
        //print("sender = \(sender)")
        if self.btnBlcok != nil {
            self.btnBlcok!(sender)
        }
    }
    
    
}