//
//  UIView+Utils.swift
//  MTP2_iOS
//
//  Created by zhongyuan on 2018/3/19.
//  Copyright © 2018年 zhongyuan.All rights reserved.
//
import UIKit

class ZJGetConstraint: NSObject {
    var firstItem:AnyObject?
    var constraints:Array<NSLayoutConstraint> = Array<NSLayoutConstraint>()
    
    var top:Array<NSLayoutConstraint>{
        get { return self.constraints(firstAttributes: [NSLayoutConstraint.Attribute.top.rawValue,NSLayoutConstraint.Attribute.topMargin.rawValue]) }
    }
    var left:Array<NSLayoutConstraint> {
        get {
            return self.constraints(firstAttributes:[NSLayoutConstraint.Attribute.left.rawValue,
                                                     NSLayoutConstraint.Attribute.leading.rawValue,
                                                     NSLayoutConstraint.Attribute.leftMargin.rawValue])
        }
    }
    var bottom:Array<NSLayoutConstraint> {
        get {
            return self.constraints(firstAttributes:[NSLayoutConstraint.Attribute.bottom.rawValue,
                                                     NSLayoutConstraint.Attribute.bottomMargin.rawValue])
        }
    }
    var right:Array<NSLayoutConstraint> {
        get {
            return self.constraints(firstAttributes:[NSLayoutConstraint.Attribute.right.rawValue,
                                                     NSLayoutConstraint.Attribute.trailing.rawValue,
                                                     NSLayoutConstraint.Attribute.trailingMargin.rawValue])
        }
    }
    var width:Array<NSLayoutConstraint> {
        get {
            return self.constraints(firstAttributes:[NSLayoutConstraint.Attribute.width.rawValue])
        }
    }
    var height:Array<NSLayoutConstraint> {
        get {
            return self.constraints(firstAttributes:[NSLayoutConstraint.Attribute.height.rawValue])
        }
    }
    var centerX:Array<NSLayoutConstraint> {
        get {
            return self.constraints(firstAttributes:[NSLayoutConstraint.Attribute.centerX.rawValue,
                                                     NSLayoutConstraint.Attribute.centerXWithinMargins.rawValue])
        }
    }
    var centerY:Array<NSLayoutConstraint> {
        get{
            return self.constraints(firstAttributes:[NSLayoutConstraint.Attribute.centerY.rawValue,
                                                     NSLayoutConstraint.Attribute.centerYWithinMargins.rawValue])
        }
    }
    
    func constraints(firstAttributes:Array<Int>) -> Array<NSLayoutConstraint>{
        var lcArr = Array<NSLayoutConstraint>()
        for lc:NSLayoutConstraint in constraints {
            for firstAttribute in firstAttributes{
                if ((lc.firstItem as? NSLayoutConstraint) == (firstItem as? NSLayoutConstraint)
                    && lc.firstAttribute.rawValue == firstAttribute) {
                    lcArr.append(lc)
                    break
                }
            }
        }
        return lcArr
    }
}

extension UIView {
    /// 盘弹起时解决输入框被遮挡问题
    ///
    /// - Parameter views: 需要使用软键盘输入的文本控件列表
    func moveView(views: [UIView]) {
        NotificationCenter.default.addObserver(forName: UIResponder.keyboardWillChangeFrameNotification, object: nil, queue: nil) { [weak self] (notification) in
            guard let weakSelf = self, let responseView = views.first(where: { $0.isFirstResponder }) else { return }
            
            /// 获取键盘的坐标
            let endFrame = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
            let keyboardY: CGFloat = kScreenHeight - endFrame.origin.y
            /// 获取目标的Y值
            let targetY: CGFloat = responseView.convert(CGPoint(x: 0, y: responseView.height), to: weakSelf).y
            /// 为防止遮挡需要偏移的距离
            let offset = targetY + keyboardY - weakSelf.height + 24 /// 24是textfield和键盘上方的间距，可以自由设定
            
            UIView.animate(withDuration: 0.25) {
                if offset > 0 {
                    weakSelf.bounds = CGRect(x: 0, y: offset, width: weakSelf.width, height: weakSelf.height)
                } else {
                    weakSelf.bounds = CGRect(x: 0, y: 0, width: weakSelf.width, height: weakSelf.height)
                }
            }
        }
    }
    
    /// 获取视图的父容器的方法
    ///
    /// - Returns: 父容器
    func superController() -> UIViewController? {
        var next: UIView? = self.superview
        repeat {
            if let nextResponder = next?.next {
                if nextResponder.isKind(of: UIViewController.classForCoder()) {
                    return nextResponder as? UIViewController
                }
            }
            next = next?.superview
        } while next != nil
        
        return nil
    }
}

extension UIView {
    // MARK: - 添加渐变色图层
    public func gradientColor(startPoint: CGPoint = .zero, endPoint: CGPoint = CGPoint(x: 1.0, y: 0.0), _ colors: [Any], _ cornerRadius: CGFloat, _ maskedCorners: CACornerMask?) {
        self.layer.cornerRadius = cornerRadius
        if let corners = maskedCorners { self.layer.maskedCorners = corners }
        /// 新建一个渐变层
        let layer = CAGradientLayer()
        layer.frame = self.layer.bounds
        /// 将渐变层的颜色属性设置为由三个颜色所构建的数组
        layer.colors = colors
        layer.cornerRadius = cornerRadius
        if let corners = maskedCorners { layer.maskedCorners = corners }
        layer.startPoint = startPoint
        layer.endPoint = endPoint
        /// 将设置好的渐变层添加到视图对象的层
        self.layer.insertSublayer(layer, at: 0)
    }
    
    // MARK: - 移除渐变图层
    /// （当希望只使用backgroundColor的颜色时，需要先移除之前加过的渐变图层）
    public func removeGradientLayer() {
        if let sl = self.layer.sublayers {
            for layer in sl {
                if layer.isKind(of: CAGradientLayer.self) {
                    layer.removeFromSuperlayer()
                }
            }
        }
    }
}