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

import UIKit

@objc protocol SPPlayerListViewControllerDelegate {
    
    ///加载新数据
    @objc optional func sp_playerViewControllerLoadNewDataV2(playerViewController: SPPlayerListViewController)
    
    ///将要加载更多数据
    @objc optional func sp_playerViewControllerShouldLoadMoreData(playerViewController: SPPlayerListViewController) -> Bool
    ///加载更多数据
    @objc optional func sp_playerViewControllerLoadMoreData(playerViewController: SPPlayerListViewController)
    ///向上加载更多数据
    @objc optional func sp_playerViewControllerLoadUpMoreData(playerViewController: SPPlayerListViewController)
    
    ///新页面展示完成
//    @objc optional func yd_playerViewController(playerListViewController: BCListPlayerViewController, didShowPlayerPage playerViewController: YDBasePlayerViewController)
}

@objc protocol SPPlayerListViewControllerDataSource {
    
    
    func sp_playerListViewController(_ viewController: SPPlayerListViewController, _ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath, oldCell: UICollectionViewCell) -> UICollectionViewCell
    
    func sp_playerListViewController(_ viewController: SPPlayerListViewController, _ collectionView: UICollectionView, numberOfItemsInSection section: Int, oldNumber: Int) -> Int
    
    
}

class SPPlayerListViewController: SPViewController {
    
    
    var contentSize: CGSize {
        return CGSize(width: kSPScreenWidth, height: kSPScreenHeight - kSPTabBarHeight)
    }
    
    var PlayerCellClass: SPPlayerListCell.Type {
        return SPPlayerListCell.self
    }
    
    weak var delegate: SPPlayerListViewControllerDelegate?
    weak var dataSource: SPPlayerListViewControllerDataSource?
    
    private(set) var dataArr: [Any] = []
    var pagination: SPListPaginationModel?
    
    ///自动下一级
    var autoNextEpisode = false
    
    private(set) 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(set) 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
        PlayerCellClass.registerCell(collectionView: collectionView)
        return collectionView
    }()
    
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
    
    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()
        sp_addActio()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        if getDataCount() > 0 && 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
        
        reloadData()
    }
    
    
    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 getDataCount() - currentIndexPath.row <= 2 {
            self.loadMoreData()
        }
        
        if currentIndexPath.row <= 2 {
//            self.loadUpMoreData()
        }
    }
    
    func reloadData() {
        CATransaction.begin()
        self.collectionView.reloadData()
        CATransaction.commit()
    }
    
    func getDataCount() -> Int {
        return self.collectionView(self.collectionView, numberOfItemsInSection: 0)
    }
}

extension SPPlayerListViewController {
    private func sp_setupUI() {
        view.addSubview(collectionView)
        
        collectionView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
    }
    
    private func sp_addActio() {
        self.viewModel.handlePauseOrPlay = { [weak self] in
            self?.clickPauseOrPlay()
        }
        
        self.viewModel.handlePlayFinish = { [weak self] in
            self?.currentPlayFinish()
        }
    }
    
}

extension SPPlayerListViewController {
    ///点击播放或暂停
    private func clickPauseOrPlay() {
//        let model = self.dataArr[currentIndexPath.section]
        ///打开支付页面
//        if self.onVideoPay() {
//            return
//        }
        
        if self.viewModel.isPlaying {
            self.viewModel.isPlaying = false
            self.viewModel.currentPlayer?.pause()
        } else {
            self.viewModel.isPlaying = true
            self.viewModel.currentPlayer?.start()
        }
    }
    
    ///当前播放完成
    private func currentPlayFinish() {
        guard self.autoNextEpisode else { return }
        
        scrollToNextEpisode()
    }
    
    ///滑动至下一级
    private func scrollToNextEpisode() {
        
        var contentOffset = self.collectionView.contentOffset
        
        if hasNextEpisode() {
            contentOffset.y = contentOffset.y + self.contentSize.height
            self.collectionView.setContentOffset(contentOffset, animated: true)
        } else {
            self.viewModel.currentPlayer?.replay()
        }
    }
    
    
    ///是否还有下一级
    private func hasNextEpisode() -> Bool {
        let contentOffset = self.collectionView.contentOffset
        let contentSize = self.collectionView.contentSize
        if contentOffset.y >= contentSize.height - self.contentSize.height {
            return false
        }
        return true
    }
}

//MARK: --------------   UICollectionViewDelegate & UICollectionViewDataSource  --------------
extension SPPlayerListViewController: UICollectionViewDelegate, UICollectionViewDataSource {
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        var cell: UICollectionViewCell = PlayerCellClass.dequeueReusableCell(collectionView: collectionView, indexPath: indexPath)
        
        if let newCell = self.dataSource?.sp_playerListViewController(self, collectionView, cellForItemAt: indexPath, oldCell: cell) {
            cell = newCell
        }
        
        if let cell = cell as? SPPlayerListCell {
            if cell.viewModel == nil {
                cell.viewModel = viewModel
            }
//            let model = dataArr[indexPath.row]
//            cell.model = model

        }
        
        if self.viewModel.currentPlayer == nil, indexPath == currentIndexPath, let playerProtocol = cell as? SPPlayerProtocol {
            self.currentIndexPath = indexPath
            self.viewModel.currentPlayer = playerProtocol
        }
        
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        let count = dataArr.count
        
        if let newCount = self.dataSource?.sp_playerListViewController(self, collectionView, numberOfItemsInSection: section, oldNumber: count) {
            return newCount
        } else {
            return count
        }
    }
    
    //滑动停止
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        scrollDidEnd(scrollView)
    }
    
    func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) {
        scrollDidEnd(scrollView)
    }
    
    private func scrollDidEnd(_ 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 getDataCount() > 0 && self.viewModel.isPlaying && isDidAppear {
            self.viewModel.currentPlayer?.start()
        }
    }
    
    @objc func willResignActiveNotification() {
        self.viewModel.currentPlayer?.pause()
    }
    
    
}

extension SPPlayerListViewController {
    
    private func loadMoreData() {
        let isLoad = self.delegate?.sp_playerViewControllerShouldLoadMoreData?(playerViewController: self)
        if isLoad != false {
            self.delegate?.sp_playerViewControllerLoadMoreData?(playerViewController: self)
        }
    }
    
    private func loadUpMoreData() {
//        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { [weak self] in
//            guard let self = self else { return }
//        }
        self.delegate?.sp_playerViewControllerLoadUpMoreData?(playerViewController: self)
    }
}