/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Application delegate class.

 */

#import "APLViewController.h"

#import "Reachability.h"

@interface APLViewController ()

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

@property (nonatomic, weak) IBOutlet UITextField *remoteHostLabel;

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

@property (nonatomic, weak) IBOutlet UITextField *remoteHostStatusField;

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

@property (nonatomic, weak) IBOutlet UITextField *internetConnectionStatusField;

@property (nonatomic) Reachability *hostReachability;

@property (nonatomic) Reachability *internetReachability;

@end

@implementation APLViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.summaryLabel.hidden = YES;

    /*

     Observe the kNetworkReachabilityChangedNotification. When that notification is posted, the method reachabilityChanged will be called.

     */

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];

    //Change the host name here to change the server you want to monitor.

    NSString *remoteHostName = @"www.apple.com";

    NSString *remoteHostLabelFormatString = NSLocalizedString(@"Remote Host: %@", @"Remote host label format string");

    self.remoteHostLabel.text = [NSString stringWithFormat:remoteHostLabelFormatString, remoteHostName];

    self.hostReachability = [Reachability reachabilityWithHostName:remoteHostName];

    [self.hostReachability startNotifier];

    [self updateInterfaceWithReachability:self.hostReachability];

    self.internetReachability = [Reachability reachabilityForInternetConnection];

    [self.internetReachability startNotifier];

    [self updateInterfaceWithReachability:self.internetReachability];

}

/*!

 * Called by Reachability whenever status changes.

 */

- (void) reachabilityChanged:(NSNotification *)note

{

    Reachability* curReach = [note object];

    NSParameterAssert([curReach isKindOfClass:[Reachability class]]);

    [self updateInterfaceWithReachability:curReach];

}

- (void)updateInterfaceWithReachability:(Reachability *)reachability

{

    if (reachability == self.hostReachability)

    {

        [self configureTextField:self.remoteHostStatusField imageView:self.remoteHostImageView reachability:reachability];

        NetworkStatus netStatus = [reachability currentReachabilityStatus];

        BOOL connectionRequired = [reachability connectionRequired];

        self.summaryLabel.hidden = (netStatus != ReachableViaWWAN);

        NSString* baseLabelText = @"";

        if (connectionRequired)

        {

            baseLabelText = NSLocalizedString(@"Cellular data network is available.\nInternet traffic will be routed through it after a connection is established.", @"Reachability text if a connection is required");

        }

        else

        {

            baseLabelText = NSLocalizedString(@"Cellular data network is active.\nInternet traffic will be routed through it.", @"Reachability text if a connection is not required");

        }

        self.summaryLabel.text = baseLabelText;

    }

    if (reachability == self.internetReachability)

    {

        [self configureTextField:self.internetConnectionStatusField imageView:self.internetConnectionImageView reachability:reachability];

    }

}

- (void)configureTextField:(UITextField *)textField imageView:(UIImageView *)imageView reachability:(Reachability *)reachability

{

    NetworkStatus netStatus = [reachability currentReachabilityStatus];

    BOOL connectionRequired = [reachability connectionRequired];

    NSString* statusString = @"";

    switch (netStatus)

    {

        case NotReachable:        {

            statusString = NSLocalizedString(@"Access Not Available", @"Text field text for access is not available");

            imageView.image = [UIImage imageNamed:@"stop-32.png"] ;

            /*

             Minor interface detail- connectionRequired may return YES even when the host is unreachable. We cover that up here...

             */

            connectionRequired = NO;

            break;

        }

        case ReachableViaWWAN:        {

            statusString = NSLocalizedString(@"Reachable WWAN", @"");

            imageView.image = [UIImage imageNamed:@"WWAN5.png"];

            break;

        }

        case ReachableViaWiFi:        {

            statusString= NSLocalizedString(@"Reachable WiFi", @"");

            imageView.image = [UIImage imageNamed:@"Airport.png"];

            break;

        }

    }

    if (connectionRequired)

    {

        NSString *connectionRequiredFormatString = NSLocalizedString(@"%@, Connection Required", @"Concatenation of status string with connection requirement");

        statusString= [NSString stringWithFormat:connectionRequiredFormatString, statusString];

    }

    textField.text= statusString;

}

- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self name:kReachabilityChangedNotification object:nil];

}

@end