//
//  HPMeasureLineClosure
//  HPlusFit
//
//  Created by lemo. on 2019/9/24.
//  Copyright © 2019 lemo. All rights reserved.
//


import UIKit

fileprivate struct Metric {
    static let radius = kScaleWidth(3.0)
}

typealias HPMeasureLineClosure = (CGFloat, Bool) -> Void
class MeasureLineView: UIView {
    
    var measureLineView: UIView!
    var shaperLayers: [CAShapeLayer] = []
    var measureLineClosure: HPMeasureLineClosure?
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        // 拖动手势
        let pan = UIPanGestureRecognizer(target: self, action: #selector(panAction(pan:)))
        pan.maximumNumberOfTouches = 1 //一个手指拖动
        self.addGestureRecognizer(pan)
        
        self.measureLineView = UIView()
        self.measureLineView.frame = CGRect(x: 0, y: kScaleHeight(0), width: 2*Metric.radius, height: self.height)
        self.measureLineView.center = CGPoint(x: self.center.x, y: self.measureLineView.center.y)
        self.measureLineView.backgroundColor = UIColor.clear
        self.addSubview(self.measureLineView)
    }
    
    func drawMeasureLine(topSpace: CGFloat) {
        
        for layer in self.shaperLayers {
            layer.removeFromSuperlayer()
        }
        
        // 绘制实线
        let solidShaperLayer = CAShapeLayer()
        solidShaperLayer.lineWidth = kScaleWidth(2.0)
        solidShaperLayer.strokeColor = UIColor.hexColor(0x4E576F).withAlphaComponent(0.1).cgColor
        solidShaperLayer.fillColor = UIColor.clear.cgColor
        self.measureLineView.layer.addSublayer(solidShaperLayer)
        self.shaperLayers.append(solidShaperLayer)
        
        let solidPath = UIBezierPath()
        solidPath.move(to: CGPoint(x: Metric.radius, y: 0))
        solidPath.addLine(to: CGPoint(x: Metric.radius, y: topSpace - Metric.radius))
        solidShaperLayer.path = solidPath.cgPath
        
        // 绘制圆圈
        let circleShaperLayer = CAShapeLayer()
        circleShaperLayer.lineWidth = kScaleWidth(2.0)
        circleShaperLayer.strokeColor = UIColor.hexColor(0x4E576F).cgColor
        circleShaperLayer.fillColor = UIColor.clear.cgColor
        self.measureLineView.layer.addSublayer(circleShaperLayer)
        self.shaperLayers.append(circleShaperLayer)
        
        let circlePath = UIBezierPath()
        circlePath.addArc(withCenter: CGPoint(x: Metric.radius, y: topSpace), radius: Metric.radius, startAngle: 0, endAngle: CGFloat(Double.pi*2.0), clockwise: true)
        circleShaperLayer.path = circlePath.cgPath
        // 绘制虚线
        let dashLineShaperLayer = CAShapeLayer()
        dashLineShaperLayer.lineWidth = kScaleWidth(2.0)
        dashLineShaperLayer.strokeColor = UIColor.hexColor(0x4E576F).cgColor
        dashLineShaperLayer.lineDashPattern = [NSNumber(value: 4), NSNumber(value: 4)]
        dashLineShaperLayer.lineCap = CAShapeLayerLineCap.round
        dashLineShaperLayer.lineJoin = CAShapeLayerLineJoin.round
        self.measureLineView.layer.addSublayer(dashLineShaperLayer)
        self.shaperLayers.append(dashLineShaperLayer)
        
        let dashPath = UIBezierPath()
        dashPath.move(to: CGPoint(x: Metric.radius, y: topSpace + Metric.radius))
        dashPath.addLine(to: CGPoint(x: Metric.radius, y: self.height))
        dashLineShaperLayer.path = dashPath.cgPath
    }
    
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    //拖动手势
    @objc func panAction(pan: UIPanGestureRecognizer) {
        
        let point = pan.location(in: self)
        print("point x: \(point.x)")
        var xValue: CGFloat = 0.0
        if point.x <= 0 {
            self.measureLineView.center = CGPoint(x: 0, y: self.measureLineView.center.y)
        }else if point.x >= self.width {
            self.measureLineView.center = CGPoint(x: self.width, y: self.measureLineView.center.y)
            xValue = self.width
        }else {
            self.measureLineView.center = CGPoint(x: point.x, y: self.measureLineView.center.y)
            xValue = point.x
        }
        print("state: \(pan.state.rawValue)")
        if pan.state.rawValue == 3 {
            xValue = 0
            self.measureLineView.isHidden = true
        }else {
            self.measureLineView.isHidden = false
        }
        
        if let measureColsure = self.measureLineClosure {
            measureColsure(xValue, self.measureLineView.isHidden)
        }
    }
}