/*
 * Copyright (C) 2015 - 2016, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.com>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *	*	Redistributions of source code must retain the above copyright notice, this
 *		list of conditions and the following disclaimer.
 *
 *	*	Redistributions in binary form must reproduce the above copyright notice,
 *		this list of conditions and the following disclaimer in the documentation
 *		and/or other materials provided with the distribution.
 *
 *	*	Neither the name of CosmicMind nor the names of its
 *		contributors may be used to endorse or promote products derived from
 *		this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import UIKit

open class RootController: UIViewController {
	/**
     A Boolean property used to enable and disable interactivity
     with the rootViewController.
     */
	@IBInspectable
    open var isUserInteractionEnabled: Bool {
		get {
			return rootViewController.view.isUserInteractionEnabled
		}
		set(value) {
			rootViewController.view.isUserInteractionEnabled = value
		}
	}
	
	/**
     A UIViewController property that references the active
     main UIViewController. To swap the rootViewController, it
     is recommended to use the transitionFromRootViewController
     helper method.
     */
	open fileprivate(set) var rootViewController: UIViewController!
	
	/**
     An initializer that initializes the object with a NSCoder object.
     - Parameter aDecoder: A NSCoder instance.
     */
	public required init?(coder aDecoder: NSCoder) {
		super.init(coder: aDecoder)
		prepare()
	}
	
	/**
     An initializer that initializes the object with an Optional nib and bundle.
     - Parameter nibNameOrNil: An Optional String for the nib.
     - Parameter bundle: An Optional NSBundle where the nib is located.
     */
	public override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
		super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
		prepare()
	}
	
	/**
     An initializer for the BarController.
     - Parameter rootViewController: The main UIViewController.
     */
	public init(rootViewController: UIViewController) {
		super.init(nibName: nil, bundle: nil)
		self.rootViewController = rootViewController
		prepare()
	}
	
	open override func viewWillLayoutSubviews() {
		super.viewWillLayoutSubviews()
		layoutSubviews()
	}
	
	/**
     A method to swap rootViewController objects.
     - Parameter toViewController: The UIViewController to swap
     with the active rootViewController.
     - Parameter duration: A TimeInterval that sets the
     animation duration of the transition.
     - Parameter options: UIViewAnimationOptions thst are used
     when animating the transition from the active rootViewController
     to the toViewController.
     - Parameter animations: An animation block that is executed during
     the transition from the active rootViewController
     to the toViewController.
     - Parameter completion: A completion block that is execited after
     the transition animation from the active rootViewController
     to the toViewController has completed.
     */
	open func transition(to viewController: UIViewController, duration: TimeInterval = 0.5, options: UIViewAnimationOptions = [], animations: (() -> Void)? = nil, completion: ((Bool) -> Void)? = nil) {
		rootViewController.willMove(toParentViewController: nil)
		addChildViewController(viewController)
		viewController.view.frame = rootViewController.view.frame
        transition(from: rootViewController,
            to: viewController,
			duration: duration,
			options: options,
			animations: animations) { [weak self, viewController = viewController, completion = completion] (result) in
                guard let s = self else {
                    return
                }
                
                viewController.didMove(toParentViewController: s)
                s.rootViewController.removeFromParentViewController()
                s.rootViewController = viewController
                s.rootViewController.view.clipsToBounds = true
                s.rootViewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
                s.rootViewController.view.contentScaleFactor = Screen.scale
                s.view.sendSubview(toBack: s.rootViewController.view)
                completion?(result)
			}
	}
	
	/**
     To execute in the order of the layout chain, override this
     method. `layoutSubviews` should be called immediately, unless you
     have a certain need.
     */
	open func layoutSubviews() {}
	
	/**
     Prepares the view instance when intialized. When subclassing,
     it is recommended to override the prepare method
     to initialize property values and other setup operations.
     The super.prepare method should always be called immediately
     when subclassing.
     */
	open func prepare() {
        view.clipsToBounds = true
        view.backgroundColor = .white
        view.contentScaleFactor = Screen.scale
        prepareRootViewController()
	}
}

extension RootController {
    /// A method that prepares the rootViewController.
    internal func prepareRootViewController() {
        prepare(viewController: rootViewController, withContainer: view)
    }
    
    /**
     A method that adds the passed in controller as a child of
     the BarController within the passed in
     container view.
     - Parameter viewController: A UIViewController to add as a child.
     - Parameter withContainer container: A UIView that is the parent of the
     passed in controller view within the view hierarchy.
     */
    internal func prepare(viewController: UIViewController?, withContainer container: UIView) {
        guard let v = viewController else {
            return
        }
        
        addChildViewController(v)
        container.addSubview(v.view)
        v.didMove(toParentViewController: self)
        v.view.frame = container.bounds
        v.view.clipsToBounds = true
        v.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        v.view.contentScaleFactor = Screen.scale
    }
}
