//
//  NSNotification+Extensions.swift
//  InputBarAccessoryView
//
//  Copyright © 2017-2019 Nathan Tannar.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.
//
//  Created by Nathan Tannar on 8/25/17.
//
import UIKit

internal extension NSNotification {
    
    var event: KeyboardEvent {
        switch self.name {
        case NSNotification.Name.UIKeyboardWillShow:
            return .willShow
        case NSNotification.Name.UIKeyboardDidShow:
            return .didShow
        case NSNotification.Name.UIKeyboardWillHide:
            return .willHide
        case NSNotification.Name.UIKeyboardDidHide:
            return .didHide
        case NSNotification.Name.UIKeyboardWillChangeFrame:
            return .willChangeFrame
        case NSNotification.Name.UIKeyboardDidChangeFrame:
            return .didChangeFrame
        default:
            return .unknown
        }
    }
    
    var timeInterval: TimeInterval? {
        guard let value = userInfo?[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber else { return nil }
        return TimeInterval(truncating: value)
    }
    
    var animationCurve: UIView.AnimationCurve? {
        guard let index = (userInfo?[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber)?.intValue else { return nil }
        guard index >= 0 && index <= 3 else { return .linear }
        return UIView.AnimationCurve.init(rawValue: index) ?? .linear
    }
    
    var animationOptions: UIView.AnimationOptions {
        guard let curve = animationCurve else { return [] }
        switch curve {
        case .easeIn:
            return .curveEaseIn
        case .easeOut:
            return .curveEaseOut
        case .easeInOut:
            return .curveEaseInOut
        case .linear:
            return .curveLinear
        @unknown default:
            return .curveLinear
        }
    }
    
    var startFrame: CGRect? {
        return (userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue
    }
    
    var endFrame: CGRect? {
        return (userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
    }
    
    var isForCurrentApp: Bool? {
        return (userInfo?[UIKeyboardIsLocalUserInfoKey] as? NSNumber)?.boolValue
    }
    
}
