/*

     File: APLViewController.m

 Abstract: The sample's primary view controller. The sample app configuration and feedback code resides in this view controller.

  Version: 1.0

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 */

#import "APLViewController.h"

NS_ENUM(NSUInteger, LoadingState) {

    kLoadingStateIdle,

    kLoadingStateBusy

} ;

@interface APLViewController () <UIGestureRecognizerDelegate, UIWebViewDelegate>

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

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

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

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

@property (weak, nonatomic) IBOutlet UIWebView *webView;

@property (weak, nonatomic) IBOutlet UISwitch *cloudDocumentSyncEnabledSwitch;

@property (nonatomic, assign) NSUInteger successCount;

@property (nonatomic, assign) NSUInteger failureCount;

@property (nonatomic, assign) enum LoadingState loadingState;

@end

@implementation APLViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.webView.layer.borderColor = [[UIColor lightGrayColor] CGColor];

    self.webView.layer.borderWidth = 1.0;

    // Add Notification Center observer to be alerted of any change to NSUserDefaults.

    // Managed app configuration changes pushed down from an MDM server appear in NSUSerDefaults.

    [[NSNotificationCenter defaultCenter] addObserverForName:NSUserDefaultsDidChangeNotification

                                                      object:nil

                                                       queue:[NSOperationQueue mainQueue]

                                                  usingBlock:^(NSNotification *note) {

                                                      [self readDefaultsValues];

                                                  }];

    // Call readDefaultsValues to make sure default values are read at least once.

    [self readDefaultsValues];

}

// The Managed app configuration dictionary pushed down from an MDM server are stored in this key.

static NSString * const kConfigurationKey = @"com.apple.configuration.managed";

// This sample application allows for a server url and cloud document switch to be configured via MDM

// Application developers should document feedback dictionary keys, including data types and valid value ranges.

static NSString * const kConfigurationServerURLKey = @"serverURL";

static NSString * const kConfigurationDisableCloudDocumentSyncKey = @"disableCloudDocumentSync";

// The dictionary that is sent back to the MDM server as feedback must be stored in this key.

static NSString * const kFeedbackKey = @"com.apple.feedback.managed";

// This sample application tracks a success and failure count for the loading of a UIWebView.

// Application developers should document feedback dictionary keys including data types to expect for feedback queries

static NSString * const kFeedbackSuccessCountKey = @"successCount";

static NSString * const kFeedbackFailureCountKey = @"failureCount";

- (void)readDefaultsValues {

    NSDictionary *serverConfig = [[NSUserDefaults standardUserDefaults] dictionaryForKey:kConfigurationKey];

    NSString *serverURLString = serverConfig[kConfigurationServerURLKey];

    // Data coming from MDM server should be validated before use.

    // If validation fails, be sure to set a sensible default value as a fallback, even if it is nil.

    if (serverURLString && [serverURLString isKindOfClass:[NSString class]]) {

        self.serverURLUILabel.text = serverURLString;

    } else {

        self.serverURLUILabel.text = @"http://foo.bar";

    }

    NSNumber *disableCloudDocumentSync = serverConfig[kConfigurationDisableCloudDocumentSyncKey];

    if (disableCloudDocumentSync && [disableCloudDocumentSync isKindOfClass:[NSNumber class]]) {

        self.cloudDocumentSyncEnabledSwitch.on = ![disableCloudDocumentSync boolValue];

    } else {

        self.cloudDocumentSyncEnabledSwitch.on = YES;

    }

    // Fetch the success and failure count values from NSUserDefaults to display.

    // Data validation for feedback values is a good idea, in case the application wrote out an unexpected value.

    NSDictionary *feedback = [[NSUserDefaults standardUserDefaults] dictionaryForKey:kFeedbackKey];

    NSNumber *successCount = feedback[kFeedbackSuccessCountKey];

    if (successCount && [successCount isKindOfClass:[NSNumber class]]) {

        self.successCount = [successCount unsignedIntegerValue];

    } else {

        self.successCount = 0;

    }

    self.successUILabel.text = [NSString stringWithFormat:@"%lu", (unsigned long)self.successCount];

    NSNumber *failureCount = feedback[kFeedbackFailureCountKey];

    if (failureCount && [failureCount isKindOfClass:[NSNumber class]]) {

        self.failureCount = [failureCount unsignedIntegerValue];

    } else {

        self.failureCount = 0;

    }

    self.failureUILabel.text = [NSString stringWithFormat:@"%lu", (unsigned long)self.failureCount];

}

- (IBAction)go:(id)sender {

    if (self.loadingState == kLoadingStateIdle) {

        self.loadingState = kLoadingStateBusy;

        self.goButton.enabled = NO;

        [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:self.serverURLUILabel.text]]];

    }

}

- (void)incrementSuccessCount {

    self.successCount += 1;

    self.successUILabel.text = [NSString stringWithFormat:@"%lu", (unsigned long)self.successCount];

    // Write the updated value into the feedback dictionary each time it changes.

    NSMutableDictionary *feedback = [[[NSUserDefaults standardUserDefaults] dictionaryForKey:kFeedbackKey] mutableCopy];

    if (!feedback) {

        feedback = [NSMutableDictionary dictionary];

    }

    feedback[kFeedbackSuccessCountKey] = @(self.successCount);

    [[NSUserDefaults standardUserDefaults] setObject:feedback forKey:kFeedbackKey];

}

- (void)incrementFailureCount {

    self.failureCount += 1;

    self.failureUILabel.text = [NSString stringWithFormat:@"%lu", (unsigned long)self.failureCount];

    // Write the updated value into the feedback dictionary each time it changes.

    NSMutableDictionary *feedback = [[[NSUserDefaults standardUserDefaults] dictionaryForKey:kFeedbackKey] mutableCopy];

    if (!feedback) feedback = [NSMutableDictionary dictionary];

    feedback[kFeedbackFailureCountKey] = @(self.failureCount);

    [[NSUserDefaults standardUserDefaults] setObject:feedback forKey:kFeedbackKey];

}

#pragma mark UIWebViewDelegate

- (void)webViewDidFinishLoad:(UIWebView *)webView {

    if (self.loadingState == kLoadingStateBusy) {

        self.loadingState = kLoadingStateIdle;

        self.goButton.enabled = YES;

        [self incrementSuccessCount];

    }

}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {

    if (self.loadingState == kLoadingStateBusy) {

        self.loadingState = kLoadingStateIdle;

        self.goButton.enabled = YES;

        [self incrementFailureCount];

    }

}

@end