/*

     File: APLAsyncImageViewController.m

 Abstract: View controller to handle sending a file that is asynchronously preprocessed after the user chooses their sending method.

  Version: 1.0

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 */

#import "APLAsyncImageViewController.h"

#import "APLProgressAlertViewController.h"

NSString * const kProgressAlertViewControllerIdentifier = @"APLProgressAlertViewController";

@interface APLAsyncImageViewController ()

@property (strong, nonatomic) UIWindow *alertWindow;

@property (strong, nonatomic) APLProgressAlertViewController *alertViewController;

@property (strong, nonatomic) UIPopoverController *activityPopover;

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

- (IBAction)openActivitySheet:(id)sender;

@end

@implementation APLAsyncImageViewController

- (IBAction)openActivitySheet:(id)sender

{

    //Create new activity provider item to pass to the activity view controller

    APLAsyncImageActivityItemProvider *aiImageItemProvider = [[APLAsyncImageActivityItemProvider alloc] init];

    //Use delegation to monitor the progress of the item method

    aiImageItemProvider.delegate = self;

    //Create an activity view controller with the activity provider item. UIActivityItemProvider (AsyncImageActivityItemProvider's superclass) conforms to the UIActivityItemSource protocol

    UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:@[aiImageItemProvider] applicationActivities:nil];

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {

        //iPhone, present activity view controller as is

        [self presentViewController:activityViewController animated:YES completion:nil];

    }

    else

    {

        //iPad, present the view controller inside a popover

        if (![self.activityPopover isPopoverVisible]) {

            self.activityPopover = [[UIPopoverController alloc] initWithContentViewController:activityViewController];

            [self.activityPopover presentPopoverFromRect:[self.shareImageButton frame] inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

        }

        else

        {

            //Dismiss if the button is tapped while pop over is visible

            [self.activityPopover dismissPopoverAnimated:YES];

        }

    }

}

#pragma mark - AsyncImageActivityItemProviderDelegate

- (void)imageActivityItemProviderPreprocessingDidBegin:(APLAsyncImageActivityItemProvider *)imageActivityItemProvider

{

    //Show alert to let the user know the item method is processing in the background.

    self.alertWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    self.alertViewController = [[APLProgressAlertViewController alloc] initWithNibName:kProgressAlertViewControllerIdentifier bundle:nil];

    //Put window on top of all other windows/views

    [self.alertWindow setWindowLevel:UIWindowLevelNormal];

    [self.alertWindow setRootViewController:self.alertViewController];

    [self.alertWindow makeKeyAndVisible];

}

- (void)imageActivityItemProvider:(APLAsyncImageActivityItemProvider *)imageActivityItemProvider preprocessingProgressDidUpdate:(float)progress

{

    [self.alertViewController updateProgressBar:progress];

}

- (void)imageActivityItemProviderPreprocessingDidEnd:(APLAsyncImageActivityItemProvider *)imageActivityItemProvider

{

    //Dismiss alert by making main window key and visible

    [self.alertWindow resignKeyWindow];

    self.alertWindow = nil;

    self.alertViewController = nil;

}

@end