//
//  AnimationHelper.swift
//  TransitionPOC
//
//  Created by Jaimin Patel on 2018-12-12.
//  Copyright © 2018 Jaimin Patel. All rights reserved.
//

import Foundation
import UIKit
import ARNTransitionAnimator

class AnimationHelper: TransitionAnimatable{

    fileprivate weak var rootVC: ViewController!
    fileprivate weak var modalVC: CardViewController!

    var completion: ((Bool) -> Void)?

    private var miniPlayerStartFrame: CGRect = CGRect.zero

    private var containerView: UIView?

    deinit {
        print("deinit MusicPlayerTransitionAnimation")
    }

    init(rootVC: ViewController, modalVC: CardViewController) {
        self.rootVC = rootVC
        self.modalVC = modalVC
    }

    func sourceVC() -> UIViewController {
        return self.rootVC
    }

    func destVC() -> UIViewController {
        return self.modalVC
    }

    func prepareContainer(_ transitionType: TransitionType, containerView: UIView, from fromVC: UIViewController, to toVC: UIViewController) {
        self.containerView = containerView
        if transitionType.isPresenting {
            self.rootVC.view.insertSubview(self.modalVC.view, belowSubview: self.rootVC.miniView)
        } else {
            self.rootVC.view.insertSubview(self.modalVC.view, belowSubview: self.rootVC.miniView)
        }
        self.rootVC.view.setNeedsLayout()
        self.rootVC.view.layoutIfNeeded()
        self.modalVC.view.setNeedsLayout()
        self.modalVC.view.layoutIfNeeded()

        self.miniPlayerStartFrame = self.rootVC.miniView.frame
    }

    func willAnimation(_ transitionType: TransitionType, containerView: UIView) {
        if transitionType.isPresenting {
            self.rootVC.beginAppearanceTransition(true, animated: false)

            self.modalVC.view.frame.origin.y = self.rootVC.miniView.frame.origin.y + self.rootVC.miniView.frame.size.height
        } else {
            self.rootVC.beginAppearanceTransition(false, animated: false)

            self.rootVC.miniView.alpha = 1.0
            self.rootVC.miniView.frame.origin.y = -self.rootVC.miniView.bounds.size.height
            //            self.rootVC.tabBarController!.tabBar.frame.origin.y = containerView.bounds.size.height
        }
    }

    func updateAnimation(_ transitionType: TransitionType, percentComplete: CGFloat) {
        if transitionType.isPresenting {
            // miniPlayerView
            let startOriginY = self.miniPlayerStartFrame.origin.y
            let endOriginY = -self.miniPlayerStartFrame.size.height
            let diff = -endOriginY + startOriginY
            // tabBar
            //            let tabStartOriginY = self.tabBarStartFrame.origin.y
            //            let tabEndOriginY = self.modalVC.view.frame.size.height
            //            let tabDiff = tabEndOriginY - tabStartOriginY

            let playerY = startOriginY - (diff * percentComplete)
            self.rootVC.miniView.frame.origin.y = max(min(playerY,  self.miniPlayerStartFrame.origin.y), endOriginY)

            self.modalVC.view.frame.origin.y = self.rootVC.miniView.frame.origin.y + self.rootVC.miniView.frame.size.height
            //            let tabY = tabStartOriginY + (tabDiff * percentComplete)
            //            self.rootVC.tabBarController!.tabBar.frame.origin.y = min(max(tabY, self.tabBarStartFrame.origin.y), tabEndOriginY)

            let alpha = 1.0 - (1.0 * percentComplete)
            self.rootVC.containerView.subviews.forEach { $0.alpha = alpha + 0.4 }
            //            self.rootVC.containerView.alpha = alpha + 0.1
            //            self.rootVC.tabBarController!.tabBar.alpha = alpha
        } else {
            // miniPlayerView
            let startOriginY = 0 - self.rootVC.miniView.bounds.size.height
            let endOriginY = self.miniPlayerStartFrame.origin.y
            let diff = -startOriginY + endOriginY
            // tabBar
            //            let tabStartOriginY = self.rootVC.containerView.bounds.size.height
            //            let tabEndOriginY = self.tabBarStartFrame.origin.y
            //            let tabDiff = tabStartOriginY - tabEndOriginY

            self.rootVC.miniView.frame.origin.y = startOriginY + (diff * percentComplete)
            self.modalVC.view.frame.origin.y = self.rootVC.miniView.frame.origin.y + self.rootVC.miniView.frame.size.height

            //            self.rootVC.tabBarController!.tabBar.frame.origin.y = tabStartOriginY - (tabDiff * (1.0 - percentComplete))

            let alpha = 1.0 * percentComplete
            self.rootVC.containerView.subviews.forEach { $0.alpha = alpha + 0.4 }
            //            self.rootVC.tabBarController!.tabBar.alpha = alpha
        }
    }

    func finishAnimation(_ transitionType: TransitionType, didComplete: Bool) {
        self.rootVC.endAppearanceTransition()

        if transitionType.isPresenting {
            if didComplete {
                self.rootVC.miniView.alpha = 0.0
                self.modalVC.view.removeFromSuperview()
                self.containerView?.addSubview(self.modalVC.view)

                self.completion?(transitionType.isPresenting)
            } else {
                self.rootVC.beginAppearanceTransition(true, animated: false)
                self.rootVC.endAppearanceTransition()
            }
        } else {
            if didComplete {
                self.modalVC.view.removeFromSuperview()

                self.completion?(transitionType.isPresenting)
            } else {
                self.rootVC.miniView.alpha = 0.0

                self.modalVC.view.removeFromSuperview()
                self.containerView?.addSubview(self.modalVC.view)

                self.rootVC.beginAppearanceTransition(false, animated: false)
                self.rootVC.endAppearanceTransition()
            }
        }
    }



}