//
//  SPPlayerListViewController.swift
//  ShortPlay
//
//  Created by 曾觉新 on 2025/4/8.
//

import UIKit

class SPPlayerListViewController: SPViewController {
    
    
    var contentSize: CGSize {
        return CGSize(width: kSPScreenWidth, height: kSPScreenHeight - kSPTabBarHeight)
    }
    
    
    private var dataArr: [Any] = []
    var pagination: SPListPaginationModel?
    
    private var viewModel = SPPlayerListViewModel()
    
    private(set) var currentIndexPath = IndexPath(row: 0, section: 0)
    
    private lazy var collectionViewLayout: UICollectionViewLayout = {
        let layout = UICollectionViewFlowLayout()
        layout.itemSize = contentSize
        layout.minimumInteritemSpacing = 0
        layout.minimumLineSpacing = 0
        return layout
    }()

    private lazy var collectionView: SPCollectionView = {
        let collectionView = SPCollectionView(frame: .zero, collectionViewLayout: collectionViewLayout)
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.isPagingEnabled = true
        collectionView.showsVerticalScrollIndicator = false
        collectionView.showsHorizontalScrollIndicator = false
        collectionView.bounces = false
        collectionView.scrollsToTop = false
        SPPlayerListCell.registerCell(collectionView: collectionView)
        return collectionView
    }()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //视频缓存
        do {
            try? KTVHTTPCache.proxyStart()
        }
        
        NotificationCenter.default.addObserver(self, selector: #selector(didBecomeActiveNotification), name: UIApplication.didBecomeActiveNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(willResignActiveNotification), name: UIApplication.willResignActiveNotification, object: nil)
        
        sp_setupUI()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        if !self.dataArr.isEmpty && self.viewModel.isPlaying {
            self.viewModel.currentPlayer?.start()
        }
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        self.viewModel.currentPlayer?.pause()
    }
    
    
    func setDataArr(dataArr: [Any]) {
        self.dataArr = dataArr
        
        CATransaction.begin()
        self.collectionView.reloadData()
        CATransaction.commit()
    }
    
    
    func clearDataArr() {
        self.dataArr.removeAll()
        self.viewModel.currentPlayer = nil
        self.collectionView.reloadData()
    }
    
    
    func play() {
        if self.isDidAppear {
            self.viewModel.currentPlayer?.start()
        }
        
        self.viewModel.isPlaying = true
        
        if self.dataArr.count - currentIndexPath.row <= 2 {
//            self.loadMoreData()
        }
        
        if currentIndexPath.row <= 2 {
//            self.loadUpMoreData()
        }
    }
}

extension SPPlayerListViewController {
    private func sp_setupUI() {
        view.addSubview(collectionView)
        
        collectionView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
    }
    
}

//MARK: --------------   UICollectionViewDelegate & UICollectionViewDataSource  --------------
extension SPPlayerListViewController: UICollectionViewDelegate, UICollectionViewDataSource {
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = SPPlayerListCell.dequeueReusableCell(collectionView: collectionView, indexPath: indexPath)
        cell.model = dataArr[indexPath.row]
        
        if self.viewModel.currentPlayer == nil, indexPath == currentIndexPath {
            self.currentIndexPath = indexPath
            self.viewModel.currentPlayer = cell
        }
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return dataArr.count
    }
    
    //滑动停止
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        let offsetY = scrollView.contentOffset.y
        let indexPaths = self.collectionView.indexPathsForVisibleItems
        for indexPath in indexPaths {
            guard let cell = self.collectionView.cellForItem(at: indexPath)  else { continue }
            if offsetY == cell.frame.origin.y {
                if self.currentIndexPath != indexPath {
                    self.skip(indexPath: indexPath)
                }
            }
        }
    }
    
    private func skip(indexPath: IndexPath) {
        currentIndexPath = indexPath
        guard let currentPlayer = self.collectionView.cellForItem(at: indexPath) as? SPPlayerProtocol else { return }
        self.viewModel.currentPlayer = currentPlayer
//        currentCell = self.collectionView.cellForItem(at: indexPath) as? BCListPlayerCell
        self.play()
    }
    
}

//MARK: --------------   APP生命周期  --------------
extension SPPlayerListViewController {
    
    @objc func didBecomeActiveNotification() {
        if !self.dataArr.isEmpty && self.viewModel.isPlaying && isDidAppear {
            self.viewModel.currentPlayer?.start()
        }
    }
    
    @objc func willResignActiveNotification() {
        self.viewModel.currentPlayer?.pause()
    }
    
    
}