//
//  SPPlayerProgressView.swift
//  MoviaBox
//
//  Created by 曾觉新 on 2025/4/9.
//

import UIKit

class SPPlayerProgressView: UIView {

    ///滑动开始
    var panStart: (() -> Void)?
    
    ///滑动中
    var panChange: ((_ progress: CGFloat) -> Void)?
    
    ///滑动完成回调
    var panFinish: ((_ progress: CGFloat) -> Void)?
    
    var progress: CGFloat = 0 {
        didSet {
            if !isPaning {
                setNeedsDisplay()
            }
        }
    }
    
    ///用来记录滑动时的当前进度
    private var tempProgress: CGFloat = 0
    
    ///滑动进度
    private var panProgress: CGFloat = 0
    
    var progressColor: UIColor = .color3D4556() {
        didSet {
            self.backgroundColor = progressColor
        }
    }
    var currentProgress: UIColor = .colorFFFFFF()
    
    var lineWidth: CGFloat = 2
    
    ///加载中状态
    var isLoading = false {
        didSet {
            if isLoading {
                if gradientTimer == nil {
                    gradientTimer = Timer.scheduledTimer(timeInterval: 0.05, target: YYWeakProxy(target: self), selector: #selector(handleGradientTimer), userInfo: nil, repeats: true)
                }
            } else {
                gradientTimer?.invalidate()
                gradientTimer = nil
            }
        }
    }
    
    ///是否在滑动中
    private var isPaning: Bool = false
    
    private var gradientTimer: Timer?
    
    private var gradientValue: CGFloat = 0
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.backgroundColor = progressColor
        
        let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture(sender:)))
        self.addGestureRecognizer(pan)
        
        let tap = UITapGestureRecognizer(target: self, action: #selector(handleTapGesture(sender:)))
        self.addGestureRecognizer(tap)
        
        
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    
    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
        super.traitCollectionDidChange(previousTraitCollection)
        setNeedsDisplay()
    }
    
    @objc private func handleGradientTimer() {
        gradientValue += 0.1
        if gradientValue > 1 {
            gradientValue = 0
        }
        setNeedsDisplay()
    }
    
    override func draw(_ rect: CGRect) {
        super.draw(rect)
        guard let context = UIGraphicsGetCurrentContext() else { return }
        let width = rect.width
        let height = rect.height
        
        if isLoading, !isPaning {
            // 定义颜色空间
            let colorSpace = CGColorSpaceCreateDeviceRGB()
            let colors: [CGColor] = [
                UIColor.clear.cgColor,
                UIColor.white.cgColor,
                UIColor.clear.cgColor
            ]
            let locations: [CGFloat] = [0.0, gradientValue, 1.0]
            
            guard let gradient = CGGradient(colorsSpace: colorSpace, colors: colors as CFArray, locations: locations) else {
                return
            }
            
            // 定义渐变的起点和终点
            let startPoint = CGPoint(x: rect.minX, y: rect.minY)
            let endPoint = CGPoint(x: rect.maxX, y: rect.maxY)
            // 绘制渐变
            context.drawLinearGradient(gradient, start: startPoint, end: endPoint, options: [])
        } else {
            var progress = self.progress
            if self.isPaning {
                progress = self.panProgress
            }
            
            ///绘制进度
            let progressPath = UIBezierPath(roundedRect: CGRect(x: 0, y: height - lineWidth, width: width, height: lineWidth), cornerRadius: lineWidth / 2)
            context.addPath(progressPath.cgPath)
            context.setFillColor(progressColor.cgColor)
            context.fillPath()
            
            ///绘制当前进度
            let currentPath = UIBezierPath(roundedRect: CGRect(x: 0, y: height - lineWidth, width: width * progress, height: lineWidth), cornerRadius: lineWidth / 2)
            context.addPath(currentPath.cgPath)
            context.setFillColor(currentProgress.cgColor)
            context.fillPath()
        }
        
         
    }

}

extension SPPlayerProgressView {
    
    @objc func handlePanGesture(sender: UIPanGestureRecognizer) {
        
        switch sender.state {
        case .began:
            self.isPaning = true
            self.tempProgress = self.progress
            sender.setTranslation(CGPoint(x: 0, y: 0), in: self)
            self.panStart?()
            
        case .changed:
            let point = sender.translation(in: self)
            let offsetX = point.x / self.width
            self.panProgress = self.tempProgress + offsetX
            if self.panProgress < 0 {
                self.panProgress = 0
            }
            self.panChange?(self.panProgress)
            setNeedsDisplay()
            
        default:
            self.isPaning = false
            self.panFinish?(self.panProgress)
            
            self.panProgress = 0
        }
    }
    
    @objc func handleTapGesture(sender: UITapGestureRecognizer) {
        let point = sender.location(in: self)
        let offsetX = point.x / self.width
        self.panFinish?(offsetX)
    }
}