BFFramework/BFFramework/Classes/Stuckpoint/View/PQStuckPointCuttingView.swift

//
//  PQStuckPointCuttingView.swift
//  PQSpeed
//
//  Created by SanW on 2021/5/8.
//  Copyright © 2021 BytesFlow. All rights reserved.
//

import UIKit

class PQStuckPointCuttingView: UIView {
    // 视频时长
    var videoDuration: CGFloat = 0
    // 卡点开始时间 默认 0
    private var stuckPointStartTime: CGFloat = 0
    // 卡点结束时间
    private var stuckPointEndTime: CGFloat = 0
    // 裁剪开始时间 默认 0
    private var cutStartTime: CGFloat = 0

//    /// 裁剪结束最终的开始时间
//    private var cutFinishedStartTime: CGFloat {
//        (scrollView.contentOffset.x / perSecondWidth) + (((scrollView.frame.width - videoCropView.frame.width) / 2 + 15) / perSecondWidth) + cutStartTime
//    }
//
//    /// 裁剪结束最终的结束时间
//    private var cutFinishedEndTime: CGFloat {
//        cutFinishedStartTime + (cutEndTime - cutStartTime)
//    }

    // 播放进度
    private var videoProgress: CGFloat = 0

    // 最小时长 默认 10s
    private var minCutTime: CGFloat = 10
    /// 时间间隔
    private var timeRange: CGFloat = cDefaultMargin
    /// 刻度高
    private var rateHeight: CGFloat = 23
    /// 时间线宽
    private var timeLineWidth: CGFloat = 35
    /// 时间线间隔
    private var timeLineMargin: CGFloat = 35
    /// 时间线高
    private var timeHeight: CGFloat = cDefaultMargin * 4
    /// 频率线宽
    private var frequencyWidth: CGFloat =  adapterWidth(width: 1.5)
    /// 频率间隔
    private var frequencyMargin: CGFloat =  adapterWidth(width: 3)
    /// 竖线和contentview 父视图的左右间隔
    private var margin: CGFloat = (cScreenWidth - adapterWidth(width: 250)) / 2

    /// 滑动区域大小
    private var contentWidth: CGFloat = 0

    // 竖线一个间隔代表多少 S 是动态的
    private var oneMarginTime: CGFloat = 0

    private var isDrawLine: Bool = false

    // 保存已经绘制的竖线用于变色使用
    var lineLayerArray: Array = Array<CAShapeLayer>.init()

    // 裁剪区的相素大小
    var cropViewWidth: CGFloat = adapterWidth(width: 250)
    /// 拖拽改变实时的回调
    var videoRangeDidChanged: ((_ startTime: CGFloat, _ endTime: CGFloat) -> Void)?
    /// 进度改变实时的回调
    var videoProgressDidChanged: ((_ progress: CGFloat) -> Void)?
    /// 拖缀结束的回调 type - 1-拖动左边裁剪结束 2--拖动右边裁剪结束 3-进度条拖动结束 4-滑动结束
    var videoDidEndDragging: ((_ type: Int, _ startTime: CGFloat, _ endTime: CGFloat, _ progress: CGFloat) -> Void)?
    // 开始划动
    var videoDidBeginDrag: (() -> Void)?

    // 选择区内的线个数
    var wavSelectCount: Int = 0
    // 整首歌的线的个数
    var wavTotalCount: Int = 0
    
    //推荐虚线的位置
    var startLineX:CGFloat = 0.0
    
    //如果是用户主动划动的 就不自动滚动到推荐位置了
    var isUserDrag:Bool = false
    /// 滚动视图
    lazy var scrollView: UIScrollView = {
        let scrollView = UIScrollView(frame: bounds)
        scrollView.showsVerticalScrollIndicator = false
        scrollView.showsHorizontalScrollIndicator = false
        scrollView.bounces = false
        scrollView.delegate = self
        if #available(iOS 11.0, *) {
            scrollView.contentInsetAdjustmentBehavior = .never
        } else {
//            automaticallyAdjustsScrollViewInsets = false
        }
        scrollView.backgroundColor = .clear
        return scrollView
    }()

    //
    lazy var rateView: UIView = {
        let rateView = UIView(frame: CGRect(x: 0, y: 22, width: scrollView.contentSize.width, height: rateHeight))
        rateView.backgroundColor = .clear
        return rateView
    }()

    // 总时长
    lazy var tatalTimeLabel: UILabel = {
        let tatalTimeLabel = UILabel()
        tatalTimeLabel.font = UIFont.systemFont(ofSize: 11)
        tatalTimeLabel.textAlignment = .right
        tatalTimeLabel.textColor = UIColor.hexColor(hexadecimal: PQBFConfig.shared.styleColor.rawValue)
        return tatalTimeLabel
    }()

    // 显示选择框
    lazy var videoCropView: UIView = {
        let videoCropView: UIView = UIView(frame: CGRect(x: (cScreenWidth - cropViewWidth) / 2, y: 0, width: cropViewWidth, height: 80))
        videoCropView.isUserInteractionEnabled = false
        videoCropView.layer.borderColor = UIColor.hexColor(hexadecimal: PQBFConfig.shared.styleColor.rawValue).cgColor
        videoCropView.layer.borderWidth = 2
        videoCropView.layer.cornerRadius = 8

        return videoCropView
    }()
    //两边的mask
    lazy var leftMaskView: UIView = {
        let leftMaskView: UIView = UIView(frame: CGRect(x:0, y: 0, width: (cScreenWidth - cropViewWidth) / 2, height: 80))
        leftMaskView.backgroundColor = UIColor.white
        leftMaskView.alpha = 0.7
        return leftMaskView
    }()
    
    //右边的mask
    lazy var rightMaskView: UIView = {
        let rightMaskView: UIView = UIView(frame: CGRect(x:videoCropView.frame.maxX, y: 0, width: (cScreenWidth - cropViewWidth) / 2, height: 80))
        rightMaskView.backgroundColor = UIColor.white
        rightMaskView.alpha = 0.7
        return rightMaskView
    }()
    
    

    private override init(frame: CGRect) {
        super.init(frame: frame)
    }

    required init?(coder _: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    init(frame: CGRect, duration: CGFloat, startTime: CGFloat, endTime: CGFloat) {
        super.init(frame: frame)
        videoDuration = duration
    
    }

    /// 更新卡点值
    /// - Parameter endTime: endTime description
    /// - Returns: <#description#>
    func updateEndTime(startTime: CGFloat, endTime: CGFloat) {
        stuckPointStartTime = startTime
        stuckPointEndTime = endTime
        BFLog(message: "推荐开始\(stuckPointStartTime) 结束\(stuckPointEndTime) 时长为:\(stuckPointEndTime - stuckPointStartTime)  音乐总时长为：\(videoDuration)")
        backgroundColor = PQBFConfig.shared.styleBackGroundColor
        addSubview(scrollView)

        addSubview(videoCropView)
        addSubview(leftMaskView)
        addSubview(rightMaskView)
        videoCropView.addSubview(tatalTimeLabel)
 
        addData()

        tatalTimeLabel.snp.remakeConstraints { make in
            make.width.equalTo(40)
            make.height.equalTo(15)
            make.top.equalTo(videoCropView.snp_top).offset(6)
            make.right.equalTo(videoCropView.snp_right).offset(-6)
        }
        
        tatalTimeLabel.text = "\(Float64(stuckPointEndTime - stuckPointStartTime).formatDurationToHMS())"
    }

    func addData() {
        // 1,选择区内的线个数 ,划动区域后 个数会变？？？
        wavSelectCount = Int(cropViewWidth / (frequencyWidth + frequencyMargin))
     
        // 2竖线一个间隔代表多少 S 是动态的
        oneMarginTime = (stuckPointEndTime - stuckPointStartTime) / CGFloat(wavSelectCount)
        
        // 3,一共绘制的竖线个数
        wavTotalCount = Int(videoDuration / oneMarginTime)

        timeRange = oneMarginTime * 10
        // 显示时间 label 的个数 , -1 不够整倍数就不显示时间了
        let timeLabelCount = Int(wavTotalCount / 10)
        contentWidth = CGFloat(wavTotalCount) * (frequencyWidth + frequencyMargin) + margin * 2 + timeLineWidth / 2
        if contentWidth < scrollView.frame.width {
            contentWidth = scrollView.frame.width
        }
        scrollView.contentSize = CGSize(width: contentWidth, height: scrollView.frame.height)
        
        
        for index in 0 ... timeLabelCount {
            scrollView.viewWithTag(100 + index)?.removeFromSuperview()
            let titleLab = UILabel(frame: CGRect(x: CGFloat(index) *  (frequencyWidth + frequencyMargin) * 10 + margin - timeLineWidth / 2, y: rateView.frame.maxY, width: timeLineWidth, height: 30))
            titleLab.font = UIFont.systemFont(ofSize: 11)
            titleLab.textAlignment = .center
            titleLab.numberOfLines = 1
            titleLab.tag = 100 + index
            titleLab.backgroundColor = .clear
            titleLab.textColor = UIColor.hexColor(hexadecimal: "#999999")
          
            titleLab.text = "\(Float64(Int(index) * Int(timeRange)).formatDurationToHMS())"
            scrollView.addSubview(titleLab)
        }
        if oneMarginTime > 0 {
            // 1,处理音频频率
            configVoiceFrequency()
            // 2，滚动到推荐位置
            if(!isUserDrag){
                scrollView.contentOffset = CGPoint(x: startLineX - margin, y: 0)
                
            }
        
            scrollView.addSubview(rateView)
        }
    }

    /// 处理音频频率
    /// - Returns: <#description#>
    func configVoiceFrequency() {
        // 整倍数
        let waveTotalCount = Int(wavTotalCount) / cFrequency.count
        // 余多少个未画的
        var remainder = Int(ceil(CGFloat(wavTotalCount) - CGFloat(waveTotalCount * cFrequency.count)))
        var totalWave: [CGFloat] = Array<CGFloat>.init()
        // 1，先画整倍数个竖线
        for _ in 0 ..< waveTotalCount {
            totalWave = totalWave + cFrequency
        }
        if remainder > cFrequency.count - 1 {
            remainder = cFrequency.count - 1
        }
        // 1,再画余数个竖线
        if remainder > 0 {
            totalWave = totalWave + cFrequency[0 ... remainder]
        }

        createWave(waveArr: totalWave)
    }

    /// 更新进度绘制不同色值
    /// progress <#progress description#>
    func updateProgress(progress: CGFloat) {
        
        if(progress < 0){
            BFLog(message: "progress is error ")
        }
        let startIndex = stuckPointStartTime / oneMarginTime
        BFLog(message: "startIndex is\(startIndex) stuckPointStartTime is: \(stuckPointStartTime)")
        let selectIndex = Int(startIndex + progress * CGFloat(wavSelectCount))
        let drawLayer:CAShapeLayer = lineLayerArray[selectIndex]
        BFLog(message: "progress is \(progress) i \(selectIndex) 命中的位置：\(CGFloat(selectIndex) * oneMarginTime)")
        drawLayer.strokeColor = UIColor.hexColor(hexadecimal: PQBFConfig.shared.styleColor.rawValue).cgColor
        drawLayer.setNeedsDisplay()
        
        if(progress >= 0.99){
            BFLog(message: "播放完成 重新更新 UI ")
            resetDefaultsColor()
        }

    }

    // 竖线恢复到原有色值
    func resetDefaultsColor() {
        for layer in lineLayerArray {
            layer.strokeColor = UIColor.hexColor(hexadecimal: "#999999").cgColor
            layer.setNeedsDisplay()
        }
        
        isUserDrag = false
        isDrawLine = false
    }

    /// 生成波纹
    /// - Parameter waveArr: <#waveArr description#>
    /// - Returns: <#description#>
    func createWave(waveArr: [CGFloat]) {
        for (i, power) in waveArr.enumerated() {
            // 画布高度
            let hight: CGFloat = rateView.frame.height
            // 开始 Y 值
            var startY: CGFloat = (hight - power) / 2.0
            if startY < 0 { startY = 0 }
            // 结束 Y 值
            var endY: CGFloat = startY + power
            if endY > CGFloat(hight) { endY = hight }
            // 线的路径
            let linePath = UIBezierPath()
            // 起点 timeLineWidth / 2 处理显示时间的 label中心为时间点
            let originX: CGFloat = CGFloat(Float(i) * Float(frequencyWidth + frequencyMargin)) + margin

            linePath.move(to: CGPoint(x: originX, y: startY))
            // 终点
            linePath.addLine(to: CGPoint(x: originX, y: endY))
            let lineLayer = CAShapeLayer()

            lineLayer.lineWidth = frequencyWidth
            lineLayer.strokeColor = UIColor.hexColor(hexadecimal: "#999999").cgColor
            lineLayer.path = linePath.cgPath
            lineLayer.fillColor = UIColor.black.cgColor

            // 推荐的开始起点是虚线
            if oneMarginTime * CGFloat(i) >= stuckPointStartTime && !isDrawLine {
                isDrawLine = true
                startLineX = originX
                linePath.move(to: CGPoint(x: originX, y: -10))
                // 终点
                linePath.addLine(to: CGPoint(x: originX, y: 30))
                lineLayer.path = linePath.cgPath
                lineLayer.lineDashPhase = 0
                lineLayer.lineDashPattern = [3, 3]
            }

            lineLayerArray.append(lineLayer)
            rateView.layer.insertSublayer(lineLayer, at: 0)
        }
    }

    deinit {
        BFLog(message: "卡点裁剪-裁剪视图销毁")
    }
    
    //划动结速后处理
    func moveEnd() {
        //最后一个竖线VIEW
        let lastLine:UIView = scrollView.viewWithTag(100 +  Int(videoDuration / timeRange) - 1) ?? UIView.init()
        //移动后的开始时间
        let startTime =  videoDuration / lastLine.frame.maxX * scrollView.contentOffset.x
        //选中的时长
        let selectDuration:CGFloat = CGFloat(stuckPointEndTime - stuckPointStartTime)
        BFLog(message: "拖拽结束 - 回调\(scrollView.contentOffset)  \(scrollView.contentSize) 开始时间为：\(startTime) 结束时间为:\(startTime + selectDuration)")
        stuckPointStartTime = startTime
        stuckPointEndTime = stuckPointStartTime + selectDuration
        if(videoDidEndDragging != nil){
            videoDidEndDragging!(1,startTime,startTime + CGFloat(stuckPointEndTime - stuckPointStartTime),0)
        }
        resetDefaultsColor()
        PQEventTrackViewModel.baseReportUpload(businessType: .bt_buttonClick, objectType: .ot_shanyinApp_musicVideoPreview_musicPeriodSelect, pageSource: .sp_shanyinApp_main, extParams: nil, remindmsg: "")



    }
}

// MARK: - scrollView滑动代理

/// scrollView滑动代理
extension PQStuckPointCuttingView: UIScrollViewDelegate {
    func scrollViewDidScroll(_: UIScrollView) {}
 
    func scrollViewWillBeginDragging(_ :UIScrollView){
        isUserDrag = true
        if(videoDidBeginDrag != nil){
            videoDidBeginDrag!()
        }
        
    }
    
    func scrollViewDidEndDecelerating(_: UIScrollView) {
        if !scrollView.isDragging, !scrollView.isDecelerating {
            moveEnd()
        }
       
    }
    func scrollViewDidEndDragging(_:UIScrollView,willDecelerate decelerate:Bool){
        if !decelerate, !scrollView.isDragging, !scrollView.isDecelerating {
            moveEnd()
        }
       
    }
    
    func scrollViewDidEndScrollingAnimation(_: UIScrollView) {
        BFLog(message: "scrollViewDidEndScrollingAnimation")
        
        
    }
}