/*

     File: PhotosViewController.m

 Abstract: The secondary view controller used for browing the photos.

  Version: 1.1

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 */

#import "PhotosViewController.h"

#import "ModelController.h"

#import "DataViewController.h"

@interface PhotosViewController ()

@property (strong, nonatomic) ModelController *modelController;

@end

#pragma mark -

@implementation PhotosViewController

- (void)updateNavBarTitle {

    if (self.modelController.pageData.count > 1) {

        self.title = [NSString stringWithFormat:@"Photos (%zd of %zd)", self.modelController.currentPageIndex + 1, (long)self.modelController.pageData.count];

    }

    else {

        DataViewController *viewController = [self.modelController.pageData objectAtIndex:self.modelController.currentPageIndex];

        self.title = viewController.title;

    }

}

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    // Configure the page view controller and add it as a child view controller.

    self.pageViewController =

        [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl

                                        navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal

                                                      options:nil];

    self.pageViewController.delegate = self;

    self.modelController.pageData = self.photosToShow;

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Storyboard" bundle:nil];

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

    NSArray *viewControllers = @[startingViewController];

    [self.pageViewController setViewControllers:viewControllers

                                      direction:UIPageViewControllerNavigationDirectionForward

                                       animated:NO

                                     completion:nil];

    [self updateNavBarTitle];

    self.pageViewController.dataSource = self.modelController;

    [self addChildViewController:self.pageViewController];

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

    [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;

    _pageAnimationFinished = YES;

}

- (ModelController *)modelController {

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

    // In more complex implementations, the model controller may be passed to the view controller.

    if (_modelController == nil) {

        _modelController = [[ModelController alloc] init];

    }

    return _modelController;

}

#pragma mark - UIPageViewControllerDelegate

- (void)pageViewController:(UIPageViewController *)pageViewController didFinishAnimating:(BOOL)finished previousViewControllers:(NSArray *)previousViewControllers transitionCompleted:(BOOL)completed {

    // update the nav bar title showing which index we are displaying

    [self updateNavBarTitle];

    _pageAnimationFinished = YES;

}

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

}

- (void)pageViewController:(UIPageViewController *)pageViewController willTransitionToViewControllers:(NSArray *)pendingViewControllers

{

    _pageAnimationFinished = NO;

}

@end