//
//  UIView+Frame.swift
//  RxXMLY
//
//  Created by sessionCh on 2017/12/14.
//  Copyright © 2017年 sessionCh. All rights reserved.
//

import UIKit

/// Extends CGRect with helper properties for positioning and setting dimensions
extension CGRect: ExpressibleByStringLiteral {
    
    /// The top coordinate of the rect.
    public var top: CGFloat {
        get {
            return origin.y
        }
        set(value) {
            origin.y = value
        }
    }
    
    // The left-side coordinate of the rect.
    public var left: CGFloat {
        get {
            return origin.x
        }
        set(value) {
            origin.x = value
        }
    }
    
    // The bottom coordinate of the rect. Setting this will change origin.y of the rect according to
    // the height of the rect.
    public var bottom: CGFloat {
        get {
            return origin.y + size.height
        }
        set(value) {
            origin.y = value - size.height
        }
    }
    
    // The right-side coordinate of the rect. Setting this will change origin.x of the rect according to
    // the width of the rect.
    public var right: CGFloat {
        get {
            return origin.x + size.width
        }
        set(value) {
            origin.x = value - size.width
        }
    }
    
    // The width of the rect.
    public var width: CGFloat {
        get {
            return size.width
        }
        set(value) {
            size.width = value
        }
    }
    
    // The height of the rect.
    public var height: CGFloat {
        get {
            return size.height
        }
        set(value) {
            size.height = value
        }
    }
    
    // The center x coordinate of the rect.
    public var centerX: CGFloat {
        get {
            return origin.x + size.width / 2
        }
        set (value) {
            origin.x = value - size.width / 2
        }
    }
    
    // The center y coordinate of the rect.
    public var centerY: CGFloat {
        get {
            return origin.y + size.height / 2
        }
        set (value) {
            origin.y = value - size.height / 2
        }
    }
    
    // The center of the rect.
    public var center: CGPoint {
        get {
            return CGPoint(x: centerX, y: centerY)
        }
        set (value) {
            centerX = value.x
            centerY = value.y
        }
    }
    
    public typealias ExtendedGraphemeClusterLiteralType = StringLiteralType
    
    public init(stringLiteral value: StringLiteralType) {
        self.init()
        let rect: CGRect
        if value[value.startIndex] != "{" {
            let comp = value.components(separatedBy: ",")
            if comp.count == 4 {
                rect = NSCoder.cgRect(for: "{{\(comp[0]),\(comp[1])}, {\(comp[2]), \(comp[3])}}")
            } else {
                rect = CGRect.zero
            }
        } else {
            rect = NSCoder.cgRect(for: value)
        }
        
        self.size = rect.size
        self.origin = rect.origin
    }
    
    public init(extendedGraphemeClusterLiteral value: ExtendedGraphemeClusterLiteralType) {
        self.init(stringLiteral: value)
    }
    
    public typealias UnicodeScalarLiteralType = StringLiteralType
    
    public init(unicodeScalarLiteral value: UnicodeScalarLiteralType) {
        self.init(stringLiteral: value)
    }
}

extension CGPoint: ExpressibleByStringLiteral {
    public typealias ExtendedGraphemeClusterLiteralType = StringLiteralType
    
    public init(stringLiteral value: StringLiteralType) {
        self.init()
        
        let point: CGPoint
        if value[value.startIndex] != "{" {
            point = NSCoder.cgPoint(for: "{\(value)}")
        } else {
            point = NSCoder.cgPoint(for: value)
        }
        self.x = point.x
        self.y = point.y
    }
    
    public init(extendedGraphemeClusterLiteral value: ExtendedGraphemeClusterLiteralType) {
        self.init(stringLiteral: value)
    }
    
    public typealias UnicodeScalarLiteralType = StringLiteralType
    
    public init(unicodeScalarLiteral value: UnicodeScalarLiteralType) {
        self.init(stringLiteral: value)
    }
}

extension UIView {
    
    /// The top coordinate of the UIView.
    public var top: CGFloat {
        get {
            return frame.top
        }
        set(value) {
            var frame = self.frame
            frame.top = value
            self.frame = frame
        }
    }
    
    /// The left coordinate of the UIView.
    public var left: CGFloat {
        get {
            return frame.left
        }
        set(value) {
            var frame = self.frame
            frame.left = value
            self.frame = frame
        }
    }
    
    /// The bottom coordinate of the UIView.
    public var bottom: CGFloat {
        get {
            return frame.bottom
        }
        set(value) {
            var frame = self.frame
            frame.bottom = value
            self.frame = frame
        }
    }
    
    /// The right coordinate of the UIView.
    public var right: CGFloat {
        get {
            return frame.right
        }
        set(value) {
            var frame = self.frame
            frame.right = value
            self.frame = frame
        }
    }
    
    // The width of the UIView.
    public var width: CGFloat {
        get {
            return frame.width
        }
        set(value) {
            var frame = self.frame
            frame.width = value
            self.frame = frame
        }
    }
    
    // The height of the UIView.
    public var height: CGFloat {
        get {
            return frame.height
        }
        set(value) {
            var frame = self.frame
            frame.height = value
            self.frame = frame
        }
    }
    
    /// The horizontal center coordinate of the UIView.
    public var centerX: CGFloat {
        get {
            return frame.centerX
        }
        set(value) {
            var frame = self.frame
            frame.centerX = value
            self.frame = frame
        }
    }
    
    /// The vertical center coordinate of the UIView.
    public var centerY: CGFloat {
        get {
            return frame.centerY
        }
        set(value) {
            var frame = self.frame
            frame.centerY = value
            self.frame = frame
        }
    }
    
    //将当前视图转为UIImage
    func asImage() -> UIImage {
        if #available(iOS 10.0, *) {
            let renderer = UIGraphicsImageRenderer(bounds: bounds)
            return renderer.image { rendererContext in
                layer.render(in: rendererContext.cgContext )
            }
        } else {
            // Fallback on earlier versions
            UIGraphicsBeginImageContext(frame.size)
            layer.render(in: UIGraphicsGetCurrentContext()!)
            let image = UIGraphicsGetImageFromCurrentImageContext()
            UIGraphicsEndImageContext()
            return image!
        }
        

    }
}

extension UIView {
    
    /// 渐变设置
    ///
    /// - Parameters:
    ///   - colors: 渐变颜色数组
    ///   - startPoint: 开始
    ///   - endPoint: 结束
    ///   - locations: 位置数组
    func gradient(colors: [UIColor], startPoint: CGPoint = CGPoint(x: 0, y: 0), endPoint: CGPoint = CGPoint(x: 0, y: 1), locations: [Float]?, autoLaoutFrame: CGRect? = nil) {
        let gradient = CAGradientLayer()
        gradient.frame = (autoLaoutFrame != nil) ? autoLaoutFrame! : bounds
        gradient.colors = colors.map{ color in return color.cgColor }
        gradient.startPoint = startPoint
        gradient.endPoint = endPoint
        if let location = locations {
            gradient.locations = location as [NSNumber]
        }
        layer.insertSublayer(gradient, at: 0)
    }
    
}

protocol NibLoadable {
    
}

extension NibLoadable where Self: UIView {
    
    static func loadFromNib(_ nibName: String? = nil) -> Self {
        return Bundle.main.loadNibNamed(nibName ?? "\(self)", owner: nil, options: nil)?.first as! Self
    }
}

extension UIView {
    @IBInspectable var cornerRadius: CGFloat {
        get {
            return layer.cornerRadius
        } set {
            layer.masksToBounds = (newValue > 0)
            layer.cornerRadius = newValue
        }
    }
    @IBInspectable var borderWidth: CGFloat {
        get {
            return layer.borderWidth
        } set {
            layer.borderWidth = newValue
        }
    }
    @IBInspectable var borderColor: UIColor {
        get {
            return UIColor(cgColor: layer.borderColor!)
        } set {
            layer.borderColor = newValue.cgColor
        }
    }
}