/*

 Copyright (C) 2015 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 The primary view controller containing the page view controller.

 */

#import "RootViewController.h"

#import "ModelController.h"

#import "DataViewController.h"

@interface RootViewController ()

@property (nonatomic, strong) ModelController *modelController;

@property (nonatomic, strong) IBOutlet UIView *pageViewControllerPlaceHolder;

@property (nonatomic, strong) UIPageViewController *pageViewController;

@end

#pragma mark -

@implementation RootViewController

@synthesize modelController = _modelController;

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.pageViewController =

        [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl

                                        navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal

                                                      options:nil];

    self.pageViewController.delegate = self;

    DataViewController *startingViewController = [self.modelController viewControllerAtIndex:0 storyboard:self.storyboard];

    NSArray *viewControllers = @[startingViewController];

    [self.pageViewController setViewControllers:viewControllers

                                      direction:UIPageViewControllerNavigationDirectionForward

                                       animated:NO

                                     completion:nil];

    self.pageViewController.dataSource = self.modelController;

    // add the page view controller as a child to this view controller

    [self addChildViewController:self.pageViewController];

    [self.pageViewControllerPlaceHolder addSubview:self.pageViewController.view];

    self.pageViewController.view.frame = self.pageViewControllerPlaceHolder.bounds;

    [self.pageViewController didMoveToParentViewController:self];

    // Add the page view controller's gesture recognizers to the book view controller's

    // view so that the gestures are started more easily.

    //

    self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;

}

- (ModelController *)modelController

{

    // Return the model controller object, creating it if necessary.

    if (!_modelController)

    {

        _modelController = [[ModelController alloc] init];

    }

    return _modelController;

}

- (UIStatusBarStyle)preferredStatusBarStyle

{

    return UIStatusBarStyleLightContent;

}

#pragma mark - UIPageViewControllerDelegate

- (UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation

{

    if (UIInterfaceOrientationIsPortrait(orientation))

    {

        // In portrait orientation: Set the spine position to "min" and the page view controller's view

        // controllers array to contain just one view controller. Setting the spine position to

        // 'UIPageViewControllerSpineLocationMid' in landscape orientation sets the doubleSided property to YES,

        // so set it to NO here.

        //

        UIViewController *currentViewController = self.pageViewController.viewControllers[0];

        NSArray *viewControllers = @[currentViewController];

        [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:nil];

        self.pageViewController.doubleSided = NO;

        return UIPageViewControllerSpineLocationMin;

    }

    // In landscape orientation: Set set the spine location to "mid" and the page view controller's

    // view controllers array to contain two view controllers. If the current page is even, set it to

    // contain the current and next view controllers; if it is odd, set the array to contain the previous

    // and current view controllers.

    //

    DataViewController *currentViewController = self.pageViewController.viewControllers[0];

    NSArray *viewControllers = nil;

    NSUInteger indexOfCurrentViewController = [self.modelController indexOfViewController:currentViewController];

    if (indexOfCurrentViewController == 0 || indexOfCurrentViewController % 2 == 0)

    {

        UIViewController *nextViewController = [self.modelController pageViewController:self.pageViewController viewControllerAfterViewController:currentViewController];

        viewControllers = @[currentViewController, nextViewController];

    }

    else

    {

        UIViewController *previousViewController = [self.modelController pageViewController:self.pageViewController viewControllerBeforeViewController:currentViewController];

        viewControllers = @[previousViewController, currentViewController];

    }

    [self.pageViewController setViewControllers:viewControllers

                                      direction:UIPageViewControllerNavigationDirectionForward

                                       animated:YES

                                     completion:nil];

    return UIPageViewControllerSpineLocationMid;

}

@end