//
//  TSImageIPanComparisonView.swift
//  testApp
//
//  Created by 100Years on 2025/5/11.
//

import UIKit

class TSImageIPanComparisonView: UIView , UIGestureRecognizerDelegate{
    // MARK: - 属性
    let oldImageView = UIImageView()
    let newImageView = UIImageView()
    private let lineView = UIView()

    private var maskLayer = CAShapeLayer()
 
    // MARK: - 初始化
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupViews()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setupViews()
    }
    
    lazy var lineX:CGFloat = self.bounds.size.width/2.0 {
        didSet{
            updateView()
        }
    }
    
    lazy var panGesture: UIPanGestureRecognizer = {
        let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
        panGesture.delegate = self
        return panGesture
    }()
    // MARK: - 视图设置
    private func setupViews() {
        // 旧图片视图（初始显示）
        oldImageView.contentMode = .scaleAspectFill
        oldImageView.clipsToBounds = true
        addSubview(oldImageView)
        
        // 新图片视图（初始隐藏）
        newImageView.contentMode = .scaleAspectFill
        newImageView.clipsToBounds = true
        addSubview(newImageView)
        
        // 分割线样式
        lineView.backgroundColor = .white
        lineView.isHidden = true
        addSubview(lineView)
        
        let leftRigntImageView = UIImageView.createImageView(image: .leftContrastRight)
        addSubview(leftRigntImageView)
        leftRigntImageView.snp.makeConstraints { make in
            make.center.equalTo(lineView.snp.center)
        }

        addGestureRecognizer(panGesture)
      
    }
    
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer,
                          shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        
        if gestureRecognizer == panGesture {
            let velocity = panGesture.velocity(in: self)
            return abs(velocity.x) < abs(velocity.y) // 只有垂直速度更快时才响应
        }
        return true // 允许同时识别
    }
    
    // 处理拖动手势
    @objc private func handlePan(_ gesture: UIPanGestureRecognizer) {
        // 获取手指在视图中的移动距离（相对起点）
        let translation = gesture.translation(in: self)
        // 只处理水平移动
         if abs(translation.x) > abs(translation.y) {
             if translation.x > 0 {
                 lineX = min(lineX + translation.x, self.width-1)
             } else if translation.x < 0 {
                 lineX = max(lineX + translation.x, 0)
             }
             gesture.setTranslation(.zero, in: self)
         }
    }


    // MARK: - 布局
    override func layoutSubviews() {
        super.layoutSubviews()
        oldImageView.frame = bounds
        newImageView.frame = bounds
        lineView.frame = CGRect(x: lineX, y: 0, width: 1, height: bounds.height)
    }
    
    // MARK: - 公开方法
    func configure(oldImage: UIImage?, newImage: UIImage?) {
        oldImageView.image = oldImage
        newImageView.image = newImage
        lineView.isHidden = false
        updateView()
    }
    
    func configure(oldImageURLString: String, newImageURLString: String) {
        oldImageView.setAsyncImage(urlString: oldImageURLString)
        newImageView.setAsyncImage(urlString: newImageURLString)
        lineView.isHidden = false
        updateView()
    }
 
    // MARK: - 动画更新
    @objc private func updateView() {
        let x = lineX
        let frame = CGRect(
            x: x,
            y: 0,
            width: bounds.width - x,
            height: bounds.height
        )
        let path = UIBezierPath(rect: frame)
        
        // 更新分割线位置
        lineView.frame.origin.x = x
//        print("frame=\(frame)")
        
    
        maskLayer.path = path.cgPath
        newImageView.layer.mask = maskLayer

    }

}