#import <ZingleSDK/ZingleSDK.h>

// Initialize the session object.
session = [ZingleSDK contactSessionWithToken:myToken
					 	   			     key:myKey
							   channelTypeId:channelId
							    channelValue:username];
								
// Optionally set an error-handling block.
// (You may alternatively use the completion block with its error property if you only wish to explicitly handle connection errors.)
session.error = ^(ZNGError * _Nonnull error) {
    // Do something with the error
};
	
// Connect, optionally providing a block to be called once all available contact services have been found
[session connectWithContactServiceChooser:^ZNGContactService * _Nullable(NSArray<ZNGContactService *> * _Nonnull availableContactServices) {
    // Choose a contact service and return it immediately or present the user with a choice and return nil
	//
	[self presentContactServiceChoiceToUser];
	return nil;
} completion:nil];

// ... Wait for user input ...

void userDidSelectContactService:(ZNGContactService *)selectedContactService
{
	// Choose a contact service if it was not done in the block above, optionally providing a completion block
	[session setContactService:selectedContactService completion:^(ZNGContactService * _Nullable contactService, ZNGService * _Nullable service, ZNGError * _Nullable error) {
	    if (error != nil) {
			// Something went wrong
		} else {
			// You did it!
			
			// If you would like to access the data directly, you may grab a conversation object.
		    ZNGConversation * conversation = session.conversation;

			// You may also grab a view controller that will handle message displaying and sending messages.
			ZNGConversationViewController * conversationViewController = session.conversationViewController;
			[self presentViewController:conversationViewController animated:YES completion:nil];
		}
	}];
}

session = [ZingleSDK contactSessionWithToken:myToken
					 	   			     key:myKey
							   channelTypeId:channelId
							    channelValue:username];
[session addObserver:self forKeyPath:@"availableContactServices" options:0 context:NULL];
[session addObserver:self forKeyPath:@"mostRecentError" options:0 context:NULL];

[session connect];								

- (void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context
{
	if ([keyPath isEqualToString:@"availableContactServices"]) {
		// Present UI to the user to select a contact service
	} else if ([keyPath isEqualToString:@"mostRecentError"]) {
		// Handle an error
	}
}

void userDidSelectContactService:(ZNGContactService *)selectedContactService
{
	[session setContactService:selectedContactService completion:^(ZNGContactService * _Nullable contactService, ZNGService * _Nullable service, ZNGError * _Nullable error) {
	    if (error != nil) {
			NSLog(@"Something went wrong")
		} else {
			// You did it!
			
			// If you would like to access the data directly, you may grab a conversation object.
		    ZNGConversation * conversation = session.conversation;

			// You may also grab a view controller that will handle message displaying and sending messages.
			ZNGConversationViewController * conversationViewController = session.conversationViewController;
			[self presentViewController:conversationViewController animated:YES completion:nil];
		}
	}];
}

// Initialize the session object.  This will send off a request for all available contact services.
session = [ZingleSDK contactSessionWithToken:myToken
					 	   			     key:myKey
							   channelTypeId:channelId
							    channelValue:username];

[session connectWithContactServiceChooser:^ZNGContactService * _Nullable(NSArray<ZNGContactService *> * _Nonnull availableContactServices) {
	if ([availableContactServices containsObject:preselectedContactService]) {
    	return preselectedContactService;
	} else {
		// The preselected contact service is not available.  Where did it all go wrong?
		[self manuallySelectContactService];
		return nil;
	}
} completion: ^(ZNGContactService * _Nullable contactService, ZNGService * _Nullable service, ZNGError * _Nullable error) {
	if (error == nil) {
		// You did it!
	}
}];