//  "PageContentViewController.h"   //


#import <UIKit/UIKit.h>

@interface PageContentViewController : UIViewController
@property (weak, nonatomic) IBOutlet UIPageControl *pageControl;
@property (weak, nonatomic) IBOutlet UIImageView *backgroundImageView;
@property (weak, nonatomic) IBOutlet UILabel *titleLabel;

@property NSUInteger pageIndex;
@property NSString *titleText;
@property NSString *imageFile;

@end

//  "PageContentViewController.m"   //

#import "PageContentViewController.h"

@interface PageContentViewController ()

@end

@implementation PageContentViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    self.pageControl.currentPage = self.pageIndex;

    self.backgroundImageView.image = [UIImage imageNamed:self.imageFile];
    self.titleLabel.text = self.titleText;
}

-(IBAction)dismiss:(id)sender
{
    // connected to Tap Gesture Recognizer so pageview can be dismissed on last page
    NSUInteger index = _pageIndex;

    if (index == 4){
        [self dismissViewControllerAnimated:YES completion:nil];
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

//  "ViewController.m"  //

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    // Create the data model
    _pageTitles = @[@"1", @"2", @"3", @"4", @"5"];
    _pageImages = @[@"page1.png", @"page2.png", @"page3.png", @"page4.png", @"page5.png"];

    // Create page view controller
    self.pageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageViewController"];
    self.pageViewController.dataSource = self;

    PageContentViewController *startingViewController = [self viewControllerAtIndex:0];
    NSArray *viewControllers = @[startingViewController];
    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

    // Change the size of page view controller
    self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

    [self addChildViewController:_pageViewController];
    [self.view addSubview:_pageViewController.view];
    [self.pageViewController didMoveToParentViewController:self];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)startWalkthrough:(id)sender {
    // I don't use a restart button, so not implemented
}

- (PageContentViewController *)viewControllerAtIndex:(NSUInteger)index
{
    if (([self.pageTitles count] == 0) || (index >= [self.pageTitles count])) {
        return nil;
    }

    // Create a new view controller and pass suitable data.
    PageContentViewController *pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageContentViewController"];
    pageContentViewController.imageFile = self.pageImages[index];
    pageContentViewController.titleText = self.pageTitles[index];
    pageContentViewController.pageIndex = index;

    return pageContentViewController;
}

#pragma mark - Page View Controller Data Source

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
    NSUInteger index = ((PageContentViewController*) viewController).pageIndex;

    if ((index == 0) || (index == NSNotFound)) {
        return nil;
    }

    index--;
    return [self viewControllerAtIndex:index];
}

- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
    NSUInteger index = ((PageContentViewController*) viewController).pageIndex;

    if (index == NSNotFound) {
        return nil;
    }

    index++;
    if (index == [self.pageTitles count]) {
        return nil;
    }
    return [self viewControllerAtIndex:index];
}

// commented out, since not necessary. set through interface builder

//- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController
//{
//  return [self.pageTitles count];
//}
//
//- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
//{
//  return 0;
//}

@end