/*

    Copyright (C) 2015 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    This view controller manages the child view controllers: MapViewController and RemindersViewController.

     It calls LocationReminderStore to check access to the Reminders application.

 */

#import "EKRSConstants.h"

#import "EKRSHelperClass.h"

#import "LocationReminderStore.h"

#import "LocationTabBarController.h"

@interface LocationTabBarController ()

@property (nonatomic, strong) NSArray *rsObservers;

@end

@implementation LocationTabBarController

- (void)viewDidLoad

{

    [super viewDidLoad];

    LocationTabBarController * __weak weakSelf = self;

    NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];

    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];

    // Register for access granted and denied, refresh data, location, and failure notifications

    id accessGranted = [center addObserverForName:EKRSAccessGrantedNotification

                                           object:[LocationReminderStore sharedInstance]

                                            queue:mainQueue

                                       usingBlock:^(NSNotification *note) {

                                           [weakSelf handleEKRSAccessGrantedNotification:note];

                                       }];

    id accessDenied = [center addObserverForName:EKRSAccessDeniedNotification

                                          object:[LocationReminderStore sharedInstance]

                                           queue:mainQueue

                                      usingBlock:^(NSNotification *note) {

                                          [weakSelf handleEKRSAccessDeniedNotification:note];

                                      }];

    id refreshData = [center addObserverForName:EKRSRefreshDataNotification

                                         object:[LocationReminderStore sharedInstance]

                                          queue:mainQueue

                                     usingBlock:^(NSNotification *note) {

                                         [weakSelf handleEKRSRefreshDataNotification:note];

                                     }];

    id reminders = [center addObserverForName:EKRSLocationRemindersNotification

                                       object:[LocationReminderStore sharedInstance]

                                        queue:mainQueue

                                   usingBlock:^(NSNotification *note) {

                                       [weakSelf handleEKRSLocationRemindersNotification:note];

                                   }];

    id failure = [center addObserverForName:EKRSFailureNotification

                                     object:[LocationReminderStore sharedInstance]

                                      queue:mainQueue

                                 usingBlock:^(NSNotification *note){

                                     [weakSelf handleEKRSFailureNotification:note];

                                 }];

    // Keep track of our observers

    self.rsObservers = @[accessGranted, accessDenied, refreshData, reminders, failure];

    // Check whether EKLocationReminders has access to Reminders

    [[LocationReminderStore sharedInstance] checkEventStoreAuthorizationStatus];

}

#pragma mark - Handle Access Granted Notification

// Handle the EKRSAccessGrantedNotification notification

-(void)handleEKRSAccessGrantedNotification:(NSNotification *)notification

{

    [[NSNotificationCenter defaultCenter] postNotificationName:LTBAccessGrantedNotification object:self];

    [[LocationReminderStore sharedInstance] fetchLocationReminders];

}

#pragma mark - Handle Access Denied Notification

// Handle the EKRSAccessDeniedNotification notification

-(void)handleEKRSAccessDeniedNotification:(NSNotification *)notification

{

    UIAlertController *alert = [EKRSHelperClass alertWithTitle:NSLocalizedString(@"Privacy Warning", nil)

                                                       message:NSLocalizedString(@"Access was not granted for Reminders.", nil)];

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

}

#pragma mark - Handle Refresh Data Notification

// Handle the EKRSRefreshDataNotification notification

-(void)handleEKRSRefreshDataNotification:(NSNotification *)notification

{

    [[LocationReminderStore sharedInstance] fetchLocationReminders];

}

#pragma mark - Handle Failure Notification

// Handle the EKRSFailureNotification notification. Display the error message encountered

-(void)handleEKRSFailureNotification:(NSNotification *)notification

{

    LocationReminderStore *myNotification = (LocationReminderStore *)notification.object;

    [EKRSHelperClass alertWithTitle:NSLocalizedString(@"Status", nil)

                            message:myNotification.errorMessage];

}

#pragma mark - Handle Incomplete Reminders Notification

// Handle the EKRSLocationRemindersNotification notification

-(void)handleEKRSLocationRemindersNotification:(NSNotification *)notification

{

    LocationReminderStore *myNotification = (LocationReminderStore *)notification.object;

    // Update the number of the reminders in the tab bar

    ((self.tabBar.items)[1]).badgeValue = [NSString stringWithFormat:@"%lu",(unsigned long)myNotification.locationReminders.count];

    // Notify the listener that there are location reminders

    [[NSNotificationCenter defaultCenter] postNotificationName:LTBRemindersFetchedNotification

                                                        object:self];

}

#pragma mark - Memory Management

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

}

- (void)dealloc

{

    // Unregister for all observers saved in rsObservers

    for (id anObserver in self.rsObservers)

    {

        [[NSNotificationCenter defaultCenter] removeObserver: anObserver];

    }

}

@end