//
//  AutolayoutKit-Swift.swift
//  PaiAi
//
//  Created by mac on 16/7/21.
//  Copyright © 2016年 FFIB. All rights reserved.
//

import UIKit
extension Array where Element : NSLayoutConstraint {
    func autolayoutInstall() {
        self.forEach {
            $0.active()
        }
    }
    func autolayoutUnInstall() {
        self.forEach {
            $0.active()
        }
    }
}

extension UIView {
    @discardableResult
    func useAutoLayout() -> Self {
        translatesAutoresizingMaskIntoConstraints = false
        return self
    }
    @discardableResult
    func setLayoutHeight(_ height: CGFloat) -> Self {
        NSLayoutConstraint(item: self as UIView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: height).active()
        return self
    }
    @discardableResult
    func setLayoutWidth(_ width: CGFloat) -> Self {
        NSLayoutConstraint(item: self as UIView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: width).active()
        return self
    }
}
extension NSLayoutConstraint {
    @discardableResult
    func active(_ priority: UILayoutPriority = UILayoutPriority.required) -> Self {
//        if self.priority != priority {
//            self.priority = priority
//        }
        self.isActive = true
        return self
    }

    func deActive() {
        self.isActive = false
    }
}

extension NSLayoutConstraint {
    // MARK: - -size
    static func equalSize(_ priority: UILayoutPriority = UILayoutPriority.required, views: UIView...) {
        equalSize(priority, views : views)
    }
    static func equalSize(_ priority: UILayoutPriority = UILayoutPriority.required, views: [UIView]) {
        equalHeight(priority, views: views)
        equalWidth(priority, views: views)
    }

    //--
    static func equalHeight(_ priority: UILayoutPriority = UILayoutPriority.required, views: UIView...) {
        equalHeight(priority, views: views)
    }
    static func equalHeight(_ priority: UILayoutPriority = UILayoutPriority.required, views: [UIView]) {
        guard views.count > 1 else {
            return
        }
        var lastView = views[0]
        views.forEach {
            let current = $0
            let c = NSLayoutConstraint(item: lastView, attribute: .height, relatedBy: .equal, toItem: current, attribute: .height, multiplier: 1, constant: 0)
            c.priority = priority
            c.active()
            lastView = current

        }
    }
    //--
    static func equalWidth(_ priority: UILayoutPriority = UILayoutPriority.required, views: UIView...) {
        equalWidth(priority, views: views)
    }
    static func equalWidth(_ priority: UILayoutPriority = UILayoutPriority.required, views: [UIView]) {
        guard views.count > 1 else {
            return
        }
        var lastView = views[0]
        views.forEach {
            let current = $0
            let c = NSLayoutConstraint(item: lastView, attribute: .width, relatedBy: .equal, toItem: current, attribute: .width, multiplier: 1, constant: 0)
            c.priority = priority
            c.active()
            lastView = current

        }
    }

    @discardableResult
    static func equalWidth(_ priority: UILayoutPriority = UILayoutPriority.required, firstView: UIView, secondView: UIView, delta: CGFloat = 0, multipler: CGFloat = 1) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: firstView, attribute: .width, relatedBy: .equal, toItem: secondView, attribute: .width, multiplier: multipler, constant: delta).active()
    }
    @discardableResult
    static func equalHeight(_ priority: UILayoutPriority = UILayoutPriority.required, firstView: UIView, secondView: UIView, delta: CGFloat = 0, multipler: CGFloat = 1) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: firstView, attribute: .height, relatedBy: .equal, toItem: secondView, attribute: .height, multiplier: multipler, constant: delta).active()
    }
   // MARK: - -center
    static func alignCenter(_ firstView: UIView, secondView: UIView) {
        centerX(firstView, secondView: secondView)
        centerY(firstView, secondView: secondView)
    }
    @discardableResult
    static func centerX(_ firstView: UIView, secondView: UIView, constant: CGFloat = 0, multiplier: CGFloat = 1) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: firstView, attribute: .centerX, relatedBy: .equal, toItem: secondView, attribute: .centerX, multiplier: multiplier, constant: constant).active()
    }
    @discardableResult
    static func centerY(_ firstView: UIView, secondView: UIView, constant: CGFloat = 0, multiplier: CGFloat = 1) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: firstView, attribute: .centerY, relatedBy: .equal, toItem: secondView, attribute: .centerY, multiplier: multiplier, constant: constant).active()
    }
  // MARK: - -space
    @discardableResult
    static func verticalSpace(_ firstView: UIView, secondView: UIView, space: CGFloat = 0) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: firstView, attribute: .bottom, relatedBy: .equal, toItem: secondView, attribute: .top, multiplier: 1, constant: space).active()
    }
    @discardableResult
    static func horizontalSpace(_ firstView: UIView, secondView: UIView, space: CGFloat = 0) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: firstView, attribute: .trailing, relatedBy: .equal, toItem: secondView, attribute: .leading, multiplier: 1, constant: space).active()
    }
 // MARK: - -edge
    @discardableResult
    static func pinTop(_ firstView: UIView, secondView: UIView, space: CGFloat = 0, priority: UILayoutPriority = UILayoutPriority.required) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: firstView, attribute: .top, relatedBy: .equal, toItem: secondView, attribute: .top, multiplier: 1, constant: space).active()
    }
    @discardableResult
    static func pinLeading(_ firstView: UIView, secondView: UIView, space: CGFloat = 0, priority: UILayoutPriority = UILayoutPriority.required) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: firstView, attribute: .leading, relatedBy: .equal, toItem: secondView, attribute: .leading, multiplier: 1, constant: space).active()
    }
    @discardableResult
    static func pinBottom(_ firstView: UIView, secondView: UIView, space: CGFloat = 0, priority: UILayoutPriority = UILayoutPriority.required) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: firstView, attribute: .bottom, relatedBy: .equal, toItem: secondView, attribute: .bottom, multiplier: 1, constant: space).active()
    }
    @discardableResult
    static func pinTrailing(_ firstView: UIView, secondView: UIView, space: CGFloat = 0, priority: UILayoutPriority = UILayoutPriority.required) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: firstView, attribute: .trailing, relatedBy: .equal, toItem: secondView, attribute: .trailing, multiplier: 1, constant: space).active()
    }
}