/*

 Copyright (C) 2014 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

  AAPLRootViewController implementation.

 */

#import "AAPLRootViewController.h"

#import "AAPLPhotoCollectionViewCell.h"

#import "AAPLOverlayViewController.h"

#import "AAPLOverlayTransitioner.h"

#import "AAPLCoolTransitioner.h"

#define kNumberOfViews (37)

#define kViewsWide (5)

#define kViewMargin (2.0)

#define kCellReuseIdentifier @"CellReuseIdentifier"

@implementation AAPLRootViewController

- (instancetype)init

{

    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];

    self = [super initWithCollectionViewLayout:layout];

    if (self)

    {

        [self configureTitleBar];

    }

    return self;

}

- (void)viewDidLoad

{

    [[self collectionView] registerClass:[AAPLPhotoCollectionViewCell class] forCellWithReuseIdentifier:kCellReuseIdentifier];

    [[self collectionView] setBackgroundColor:nil];

    UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout *)[self collectionViewLayout];

    [layout setMinimumInteritemSpacing:kViewMargin];

    [layout setMinimumLineSpacing:kViewMargin];

    [self viewWillTransitionToSize:[[self view] bounds].size withTransitionCoordinator:nil];

}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section

{

    return kNumberOfViews;

}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

{

    AAPLPhotoCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kCellReuseIdentifier forIndexPath:indexPath];

    NSString *photoName = [@([indexPath item]) stringValue];

    UIImage *photo = [UIImage imageNamed:photoName];

    [cell setImage:photo];

    return cell;

}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath

{

    AAPLOverlayViewController *overlay = [[AAPLOverlayViewController alloc] init];

    // Change our transitioning delegate based on whether or not the presentation should be awesome

    if([self presentationShouldBeAwesome])

    {

        _transitioningDelegate = [[AAPLCoolTransitioningDelegate alloc] init];

    }

    else

    {

        _transitioningDelegate = [[AAPLOverlayTransitioningDelegate alloc] init];

    }

    [overlay setTransitioningDelegate:[self transitioningDelegate]];

    AAPLPhotoCollectionViewCell *selectedCell = (AAPLPhotoCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];

    [overlay setPhotoView:selectedCell];

    [self presentViewController:overlay animated:YES completion:NULL];

}

- (BOOL)presentationShouldBeAwesome

{

    return [[self coolSwitch] isOn];

}

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator

{

    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];

    CGFloat itemWidth = size.width / kViewsWide;

    itemWidth -= kViewMargin;

    // Base our item size off of our view size

    [(UICollectionViewFlowLayout *)[[self collectionView] collectionViewLayout] setItemSize:CGSizeMake(itemWidth, itemWidth)];

    [[self collectionViewLayout] invalidateLayout];

}

- (NSUInteger)supportedInterfaceOrientations

{

    return UIInterfaceOrientationMaskAll;

}

- (void)configureTitleBar

{

    [self setTitle:NSLocalizedString(@"LookInside Photos", @"App Title")];

    [self setEdgesForExtendedLayout:UIRectEdgeLeft | UIRectEdgeBottom | UIRectEdgeRight];

    _coolSwitch = [[UISwitch alloc] init];

    [[self coolSwitch] setOnTintColor:[UIColor purpleColor]];

    [[self coolSwitch] setTintColor:[UIColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:0.2]];

    UIBarButtonItem *enablecoolBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:[self coolSwitch]];

    [[self navigationItem] setLeftBarButtonItem:enablecoolBarButtonItem];

}

@end