/*

     File: APLEventDetailViewController.m

 Abstract: The table view controller responsible for displaying the time, coordinates, and photo of an event, and allowing the user to select a photo for the event, or delete the existing photo.

  Version: 2.0

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#import "APLEventDetailViewController.h"

#import "APLEvent.h"

#import "APLPhoto.h"

@interface APLEventDetailViewController ()

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

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

@property (nonatomic, weak) IBOutlet UIButton *deletePhotoButton;

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

@end

@implementation APLEventDetailViewController

#pragma mark - Lifecycle

- (void)viewDidLoad

{

    [super viewDidLoad];

    // A date formatter for the creation date.

    static NSDateFormatter *dateFormatter = nil;

    if (dateFormatter == nil) {

        dateFormatter = [[NSDateFormatter alloc] init];

        [dateFormatter setTimeStyle:NSDateFormatterShortStyle];

        [dateFormatter setDateStyle:NSDateFormatterMediumStyle];

    }

    // A date formatter for the coordinates.

    static NSNumberFormatter *numberFormatter;

    if (numberFormatter == nil) {

        numberFormatter = [[NSNumberFormatter alloc] init];

        [numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];

        [numberFormatter setMaximumFractionDigits:3];

    }

    self.timeLabel.text = [dateFormatter stringFromDate:[self.event creationDate]];

    NSString *formatString = NSLocalizedString(@"latitude:%@, longitude%@", @"coordinates string in detail view");

    NSString *coordinatesString = [[NSString alloc] initWithFormat:formatString,

                             [numberFormatter stringFromNumber:[self.event latitude]],

                             [numberFormatter stringFromNumber:[self.event longitude]]];

    self.coordinatesLabel.text = coordinatesString;

    [self updatePhotoInfo];

}

#pragma mark - Editing the photo

- (IBAction)deletePhoto:(id)sender

{

    /*

     If the event already has a photo, delete the Photo object and dispose of the thumbnail.

     Because the relationship was modeled in both directions, the event's relationship to the photo will automatically be set to nil.

     */

    NSManagedObjectContext *context = self.event.managedObjectContext;

    [context deleteObject:self.event.photo];

    self.event.thumbnail = nil;

    // Commit the change.

    NSError *error ;

    if (![self.event.managedObjectContext save:&error]) {

        // Replace this implementation with code to handle the error appropriately.

        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.

        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);

        abort();

    }

    // Update the user interface appropriately.

    [self updatePhotoInfo];

}

- (IBAction)choosePhoto:(id)sender

{

    // Show an image picker to allow the user to choose a new photo.

    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

    imagePicker.delegate = self;

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

}

- (void)updatePhotoInfo

{

    // Synchronize the photo image view and the text on the photo button with the event's photo.

    UIImage *image = self.event.photo.image;

    self.photoImageView.image = image;

    if (image) {

        self.deletePhotoButton.enabled = YES;

    }

    else {

        self.deletePhotoButton.enabled = NO;

    }

}

#pragma mark - Image picker delegate methods

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)selectedImage editingInfo:(NSDictionary *)editingInfo

{

    APLEvent *event = self.event;

    NSManagedObjectContext *context = event.managedObjectContext;

    // If the event already has a photo, delete it.

    if (event.photo) {

        [context deleteObject:event.photo];

    }

    // Create a new photo object and set the image.

    APLPhoto *photo = [NSEntityDescription insertNewObjectForEntityForName:@"Photo" inManagedObjectContext:context];

    photo.image = selectedImage;

    // Associate the photo object with the event.

    event.photo = photo;    

    // Create a thumbnail version of the image for the event object.

    CGSize size = selectedImage.size;

    CGFloat ratio = 0;

    if (size.width > size.height) {

        ratio = 44.0 / size.width;

    }

    else {

        ratio = 44.0 / size.height;

    }

    CGRect rect = CGRectMake(0.0, 0.0, ratio * size.width, ratio * size.height);

    UIGraphicsBeginImageContext(rect.size);

    [selectedImage drawInRect:rect];

    event.thumbnail = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    // Commit the change.

    NSError *error = nil;

    if (![event.managedObjectContext save:&error]) {

        // Replace this implementation with code to handle the error appropriately.

        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.

        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);

        abort();

    }

    // Update the user interface appropriately.

    [self updatePhotoInfo];

    [self dismissViewControllerAnimated:YES completion:NULL];

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

{

    // The user canceled -- simply dismiss the image picker.

    [self dismissViewControllerAnimated:YES completion:NULL];

}

@end