/*

     File: APLViewController.m

 Abstract: Simple view controller to loads a view and update an image.

  Version: 1.1

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 */

#import "APLViewController.h"

#import "UIImageEffects.h"

#import <mach/mach.h>

#import <mach/mach_time.h>

@interface APLViewController ()

@property (nonatomic, weak) IBOutlet UIImageView *imageView;

@property (nonatomic, weak) IBOutlet UILabel *effectLabel;

@property (nonatomic) UIImage *image;

@property (nonatomic) int imageIndex;

@end

@implementation APLViewController

//| ----------------------------------------------------------------------------

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.image = [UIImage imageNamed:@"DisplayImage"];    

    [self updateImage:nil];

    [self showAlertForFirstRun];

    if ([[[UIDevice currentDevice] systemVersion] floatValue] < 7.1)

    {

        // There was a bug in iOS versions 7.0.x which caused vImage buffers

        // created using vImageBuffer_InitWithCGImage to be initialized with data

        // that had the reverse channel ordering (RGBA) if BOTH of the following

        // conditions were met:

        //      1) The vImage_CGImageFormat structure passed to

        //         vImageBuffer_InitWithCGImage was configured with

        //         (kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little)

        //         for the bitmapInfo member.  That is, if you wanted a BGRA

        //         vImage buffer.

        //      2) The CGImage object passed to vImageBuffer_InitWithCGImage

        //         was loaded from an asset catalog.

        //

        // To reiterate, this bug only affected images loaded from asset

        // catalogs.

        //

        // The workaround is to setup a bitmap context, draw the image, and

        // capture the contents of the bitmap context in a new image.

        UIGraphicsBeginImageContextWithOptions(self.image.size, NO, self.image.scale);

        [self.image drawAtPoint:CGPointZero];

        self.image = UIGraphicsGetImageFromCurrentImageContext();

        UIGraphicsEndImageContext();

    }

}

//| ----------------------------------------------------------------------------

- (IBAction)updateImage:(id)sender

{

    NSString *effectText = @"";

    UIImage *effectImage = nil;

    switch (self.imageIndex)

    {

        case 0:

            effectImage = self.image;

            break;

        case 1:

            effectImage = [UIImageEffects imageByApplyingLightEffectToImage:self.image];

            effectText = NSLocalizedString(@"Light", @"");

            self.effectLabel.textColor = [UIColor darkTextColor];

            break;

        case 2:

            effectImage = [UIImageEffects imageByApplyingExtraLightEffectToImage:self.image];

            effectText = NSLocalizedString(@"Extra light", @"");

            self.effectLabel.textColor = [UIColor darkTextColor];

            break;

        case 3:

            effectImage = [UIImageEffects imageByApplyingDarkEffectToImage:self.image];

            effectText = NSLocalizedString(@"Dark", @"");

            self.effectLabel.textColor = [UIColor lightTextColor];

            break;

        case 4:

            effectImage = [UIImageEffects imageByApplyingTintEffectWithColor:[UIColor blueColor] toImage:self.image];

            effectText = NSLocalizedString(@"Color tint", @"");

            self.effectLabel.textColor = [UIColor lightTextColor];

            break;

    }

    self.imageView.image = effectImage;

    self.effectLabel.text = effectText;

}

//| ----------------------------------------------------------------------------

- (IBAction)nextEffect:(id)sender

{

    self.imageIndex++;

    if (self.imageIndex > 4)

    {

        self.imageIndex = 0;

    }

    [self updateImage:sender];

}

//| ----------------------------------------------------------------------------

- (void)showAlertForFirstRun

{

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

    static NSString *DidFirstRunKey = @"DidFirstRun";

    BOOL didFirstRun = [userDefaults boolForKey:DidFirstRunKey];

    if (!didFirstRun)

    {

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Tap to change image effect", @"") message:nil delegate:nil cancelButtonTitle:NSLocalizedString(@"Dismiss", @"") otherButtonTitles:nil];

        [alert show];

        [userDefaults setBool:YES forKey:DidFirstRunKey];

    }

}

@end