/*

     File: APLAppDelegate.m

 Abstract: Application Delegate that handles app start up and the AirDropped received files.

  Version: 1.0

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

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 */

#import "APLAppDelegate.h"

#import "APLProfileTableViewController.h"

#import "APLSharingTypesTableViewController.h"

#import "APLProfile.h"

#import "APLUtilities.h"

NSString * const kCustomScheme = @"adcs";

NSString * const kMainStoryboardName = @"Main";

NSString * const kProfileViewControllerIdentifier = @"ProfileViewController";

NSString * const kDocumentsInboxFolder = @"Inbox";

//Custom Notifications used when receiving content

NSString * const DisplayingSaveWindowNotification = @"DisplayingSaveWindow";

NSString * const SavedReceivedProfilesNotification = @"SavedReceivedProfiles";

NSString * const SavedCustomURLNotification = @"SavedCustomURL";

NSString * const kSavedReceivedProfilesFileNamesKey = @"SavedFileNames";

@interface APLAppDelegate()

@property (strong, nonatomic) UINavigationController *navigationController;

@property (strong, nonatomic) APLSharingTypesTableViewController *sharingTypesViewController;

@property (strong, nonatomic) NSMutableArray *receivedProfileQueue;

@property (strong, nonatomic) UINavigationController *receivedProfilesNavigationController;

@property (strong, nonatomic) NSMutableArray *savedFileNames;

@property (strong, nonatomic) UIWindow *saveReceivedWindow;

@end

@implementation APLAppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    self.navigationController = (UINavigationController *)self.window.rootViewController;

    self.sharingTypesViewController = self.navigationController.viewControllers[0];

    self.savedFileNames = [NSMutableArray array];

    return YES;

}

- (void)applicationDidBecomeActive:(UIApplication *)application

{

    //Check for orphaned files in the inbox

    [self handleDocumentsInbox];

}

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation

{

    if (url) {

        if (url.scheme && [url.scheme isEqualToString:kCustomScheme]) {

            //Save the received profile and notify observers

            [APLUtilities saveCustomURL:url];

            [[NSNotificationCenter defaultCenter] postNotificationName:SavedCustomURLNotification object:nil];

            //Show custom URL view controller if currently in the sharing types table, otherwise don't, the user could be in the middle of something

            if ([self.navigationController visibleViewController] == self.sharingTypesViewController && !self.saveReceivedWindow) {

                [self.sharingTypesViewController showCustomURLView];

            }

        }

        else

        {

            APLProfile *profile = [APLUtilities securelyUnarchiveProfileWithFile:[url path]];

            if (profile) {

                //Enqueue profile incase another one is already being handled

                [self enqueueProfile:profile];

            }

            //Clean up inbox

            [self removeInboxItem:url];

        }

    }

    return YES;

}

#pragma mark - Document Inbox Handling

- (void)handleDocumentsInbox

{

    //All incoming files are stored in Documents/Inbox/

    NSString *inboxPath = [[APLUtilities documentsDirectory] stringByAppendingPathComponent:kDocumentsInboxFolder];

    NSFileManager *fileManager = [[NSFileManager alloc] init];

    NSArray *inboxFiles = [fileManager contentsOfDirectoryAtPath:inboxPath error:nil];

    for (NSString *path in inboxFiles) {

        //Append file name to path and create URL

        NSURL *url = [NSURL fileURLWithPath:[inboxPath stringByAppendingPathComponent:path]];

        [self application:[UIApplication sharedApplication] openURL:url sourceApplication:@"" annotation:nil];

    }

}

- (void)removeInboxItem:(NSURL *)itemURL

{

    //Clean up the inbox once the file has been processed

    NSError *error = nil;

    [[NSFileManager defaultManager] removeItemAtPath:[itemURL path] error:&error];

    if (error) {

        NSLog(@"ERROR: Inbox file could not be deleted");

    }

}

#pragma mark - AirDropped Profile Receiving

/****************************************************

 Handling Incoming Profiles

 When the app receives a profile it displays it own view to give a chance to look at the profile and decide if they want it.

 There are two considerations when displaying a save view for the user.

 First the user could be doing an important task that this save view is going to interrupt. To account for this the app displays the save view in its own window, which will not disturb the main window's contents.

 Second while the user is deciding if they want to keep the profile, another one could arrive. Because of this possibility, this app keeps a queue of arriving profiles.

 When the first profile arrives a navigation controller is created to display that profile in a APLProfileViewController.

 When each subsequent profile arrives they are enqueued. Once the user decides whether or not to save the displayed profile, the next profile is pushed onto the navigation controller's stack.

 ******************************************************/

- (void)enqueueProfile:(APLProfile *)profile

{

    if (!_receivedProfileQueue) {

        _receivedProfileQueue = [NSMutableArray array];

    }

    @synchronized(self.receivedProfileQueue)

    {

        [self.receivedProfileQueue addObject:profile];

        //If first recevied, profile present

        if (self.receivedProfileQueue.count == 1) {

            [self presentFirstProfile];

        }

    }

}

- (APLProfile *)dequeueProfile

{

    @synchronized(self.receivedProfileQueue) {

        APLProfile *profile = nil;

        if (self.receivedProfileQueue.count > 0) {

            profile = [self.receivedProfileQueue firstObject];

            [self.receivedProfileQueue removeObject:profile];

        }

        return profile;

    }

}

- (void)presentFirstProfile

{

    APLProfile *profile = [self.receivedProfileQueue firstObject];

    if (profile) {

        //Notify observers that the save window will appear

        [[NSNotificationCenter defaultCenter] postNotificationName:DisplayingSaveWindowNotification object:nil];

        //Create Window

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

        [self.saveReceivedWindow setWindowLevel:UIWindowLevelNormal];

        //Create profileViewController to display received profile

        APLProfileViewController *profileViewController = [self createProfileViewControllerForProfile:profile];

        //Create a navigation controller to handle displaying multiple incoming profiles

        UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:profileViewController];

        self.receivedProfilesNavigationController = nav;

        [self.saveReceivedWindow setRootViewController:nav];

        //Set frame below the screen

        CGRect originalFrame = self.saveReceivedWindow.frame;

        CGRect newFrame = self.saveReceivedWindow.frame;

        newFrame.origin.y = newFrame.origin.y + newFrame.size.height;

        self.saveReceivedWindow.frame = newFrame;

        //Create animation to have window slide up from bottom of the screen

        [self.saveReceivedWindow makeKeyAndVisible];

        [UIView animateWithDuration:0.4f

                              delay:0.0f

                            options:UIViewAnimationOptionCurveEaseInOut

                         animations:^{

                             self.saveReceivedWindow.frame = originalFrame;

                         }

                         completion:nil];

    }

}

- (void)presentNextProfile

{

    APLProfile *profile = [self.receivedProfileQueue firstObject];

    if (profile) {

        APLProfileViewController *profileViewController = [self createProfileViewControllerForProfile:profile];

        //Make sure navigation controller exists

        if (self.receivedProfilesNavigationController) {

            [self.receivedProfilesNavigationController pushViewController:profileViewController animated:YES];

        }

     }

    else if (self.receivedProfilesNavigationController) //Queue is empty

    {

        //Animate the window away (slide down)

        [UIView animateWithDuration:0.4f

                              delay:0.0f

                            options:UIViewAnimationOptionCurveEaseInOut

                         animations:^{

                             [self.saveReceivedWindow resignKeyWindow];

                             CGRect newFrame = self.saveReceivedWindow.frame;

                             newFrame.origin.y = newFrame.origin.y + newFrame.size.height;;

                             self.saveReceivedWindow.frame = newFrame;

                         }

                         completion:^(BOOL finished) {

                             self.saveReceivedWindow = nil;

                             self.receivedProfilesNavigationController = nil;

                             //Only show profile table if at least one profile was saved

                             if ([self.savedFileNames count] > 0) {

                                 NSDictionary *userInfo = @{kSavedReceivedProfilesFileNamesKey : [self.savedFileNames copy]};

                                 //Notify observers at least one profile was saved

                                 [[NSNotificationCenter defaultCenter] postNotificationName:SavedReceivedProfilesNotification object:nil userInfo:userInfo];

                                 //Show profile table if currently in the sharing types table, otherwise don't, the user could be in the middle of something

                                 if ([self.navigationController visibleViewController] == self.sharingTypesViewController) {

                                     [self.sharingTypesViewController showProfilesTable];

                                 }

                                 [self.savedFileNames removeAllObjects];

                             }

                         }];

    }

}

- (void)saveProfile:(id)sender

{

    APLProfile *profile = [self dequeueProfile];

    if (profile) {

        //Save profile to persistent file

        [APLUtilities saveProfile:profile];

        [self.savedFileNames addObject:[profile filename]];

    }

    [self presentNextProfile];

}

- (void)discardProfile:(id)sender

{

    [self dequeueProfile];

    [self presentNextProfile];

}

- (APLProfileViewController *)createProfileViewControllerForProfile:(APLProfile *)profile

{

    UIStoryboard *sb = [UIStoryboard storyboardWithName:kMainStoryboardName bundle:nil];

    APLProfileViewController *profileViewController = [sb instantiateViewControllerWithIdentifier:kProfileViewControllerIdentifier];

    profileViewController.profile = profile;

    profileViewController.interactive = NO;

    UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:@"Discard"

                                                                     style:UIBarButtonItemStylePlain

                                                                    target:self

                                                                    action:@selector(discardProfile:)];

    UIBarButtonItem *saveButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave

                                                                                target:self

                                                                                action:@selector(saveProfile:)];

    profileViewController.navigationItem.leftBarButtonItem = cancelButton;

    profileViewController.navigationItem.rightBarButtonItem = saveButton;

    return profileViewController;

}

@end