//
//  SPPlayerProgressView.swift
//  Thimra
//
//  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()
    var currentProgress: UIColor = .colorFFFFFF()
    
    var lineWidth: CGFloat = 2
    
    ///是否在滑动中
    private var isPaning: Bool = false
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.backgroundColor = .clear
        
        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()
    }
    
    override func draw(_ rect: CGRect) {
        super.draw(rect)
        guard let context = UIGraphicsGetCurrentContext() else { return }
        let width = rect.width
        let height = rect.height
        
        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)
    }
}