paiai_ios/PaiAi/PaiaiUIKit/Reusable/UIKit/AlertViewController/AlertViewController.swift

//
//  AlertViewController.swift
//  PaiAi
//
//  Created by FFIB on 2017/11/21.
//  Copyright © 2017年 yb. All rights reserved.
//

import UIKit


open class AlertViewController: UIViewController, PresentViewController {
    
    open var animationView: UIView? {
        return nil
    }
    
    public enum Style {
        case alert
        case actionSheet
        case custom(UIView, PresentAnimatable)
    }
    
    open var style: Style {
        return _style
    }
    
    var _style: Style = .alert
    
    public var animator: PresentAnimatable = AlertAnimator()
    
    init(style: Style = .alert) {
        _style = style
        super.init(nibName: nil, bundle: nil)
        commonInit()
    }
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        commonInit()
    }

    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
    }

    override open func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor(gray: 52, a: 0)
        configurationGestures()
        
    }
    
    fileprivate func commonInit() {
        modalPresentationStyle = .custom
        setTransitioningDelegate(self)
        
        configurationAnimator()
    }
    
    fileprivate func configurationGestures() {
        configurationTapGesture()
        configurationSwipeGesture()
    }
    
    fileprivate func configurationTapGesture() {
        let tap = UITapGestureRecognizer(target: self, action: #selector(disappear))
        tap.setDelegate(self)
        view.addGestureRecognizer(tap)
    }
    
    fileprivate func configurationSwipeGesture() {
        switch _style {
        case .alert, .custom: return
        case .actionSheet: break
        }

        let swipe = UISwipeGestureRecognizer(target: self, action: #selector(disappear))
        swipe.setDelegate(self)
        swipe.direction = .down
        view.addGestureRecognizer(swipe)
    }
    
    fileprivate func configurationAnimator() {
        animator = style.animator
    }

    @objc public func disappear() {
        dismiss(animated: true, completion: nil)
    }
}

fileprivate extension AlertViewController.Style {
    var animator: PresentAnimatable {
        switch self {
        case .alert:
            return AlertAnimator()
        case .actionSheet:
            return ActionSheetAnimator()
        case let .custom(_, customAnimator):
            return customAnimator
        }
    }
}