/*

     File: TweetingViewController.m

 Abstract: This view controller allows the user to send a tweet by using the built-in composition sheet or by using a custom post request. The user can additionally get the current Twitter public timeline.

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#import "TweetingViewController.h"

@implementation TweetingViewController

@synthesize outputTextView, easyTweetButton, customTweetButton;

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.

}

#pragma mark - View lifecycle

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    // This notification is posted when the accounts managed by this account store changed in the database.

    // When you receive this notification, you should refetch all account objects.

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(canTweetStatus) name:ACAccountStoreDidChangeNotification object:nil];

}

- (void)viewDidUnload

{

    [super viewDidUnload];

    // Release any retained subviews of the main view.

    // e.g. self.myOutlet = nil;

    self.easyTweetButton = nil;

    self.customTweetButton = nil;

    self.outputTextView = nil;

}

- (void)viewDidAppear:(BOOL)animated

{

    [super viewDidAppear:animated];

    // Check to make sure our UI is set up appropriately, depending on if we can tweet or not.

    [self canTweetStatus];

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

    // Return YES for supported orientations

    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);

}

- (IBAction)sendEasyTweet:(id)sender {

    // Set up the built-in twitter composition view controller.

    TWTweetComposeViewController *tweetViewController = [[TWTweetComposeViewController alloc] init];

    // Set the initial tweet text. See the framework for additional properties that can be set.

    [tweetViewController setInitialText:@"Hello. This is a tweet."];

    // Create the completion handler block.

    [tweetViewController setCompletionHandler:^(TWTweetComposeViewControllerResult result) {

        NSString *output;

        switch (result) {

            case TWTweetComposeViewControllerResultCancelled:

                // The cancel button was tapped.

                output = @"Tweet cancelled.";

                break;

            case TWTweetComposeViewControllerResultDone:

                // The tweet was sent.

                output = @"Tweet done.";

                break;

            default:

                break;

        }

        [self performSelectorOnMainThread:@selector(displayText:) withObject:output waitUntilDone:NO];

        // Dismiss the tweet composition view controller.

        [self dismissModalViewControllerAnimated:YES];

    }];

    // Present the tweet composition view controller modally.

    [self presentModalViewController:tweetViewController animated:YES];

}

- (IBAction)sendCustomTweet:(id)sender {

    // Create an account store object.

    ACAccountStore *accountStore = [[ACAccountStore alloc] init];

    // Create an account type that ensures Twitter accounts are retrieved.

    ACAccountType *accountType = [accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];

    // Request access from the user to use their Twitter accounts.

    [accountStore requestAccessToAccountsWithType:accountType withCompletionHandler:^(BOOL granted, NSError *error) {

        if(granted) {

            // Get the list of Twitter accounts.

            NSArray *accountsArray = [accountStore accountsWithAccountType:accountType];

            // For the sake of brevity, we'll assume there is only one Twitter account present.

            // You would ideally ask the user which account they want to tweet from, if there is more than one Twitter account present.

            if ([accountsArray count] > 0) {

                // Grab the initial Twitter account to tweet from.

                ACAccount *twitterAccount = [accountsArray objectAtIndex:0];

                // Create a request, which in this example, posts a tweet to the user's timeline.

                // This example uses version 1 of the Twitter API.

                // This may need to be changed to whichever version is currently appropriate.

                TWRequest *postRequest = [[TWRequest alloc] initWithURL:[NSURL URLWithString:@"http://api.twitter.com/1/statuses/update.json"] parameters:[NSDictionary dictionaryWithObject:@"Hello. This is a tweet." forKey:@"status"] requestMethod:TWRequestMethodPOST];

                // Set the account used to post the tweet.

                [postRequest setAccount:twitterAccount];

                // Perform the request created above and create a handler block to handle the response.

                [postRequest performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {

                    NSString *output = [NSString stringWithFormat:@"HTTP response status: %i", [urlResponse statusCode]];

                    [self performSelectorOnMainThread:@selector(displayText:) withObject:output waitUntilDone:NO];

                }];

            }

        }

    }];

}

- (IBAction)getPublicTimeline:(id)sender {

    // Create a request, which in this example, grabs the public timeline.

    // This example uses version 1 of the Twitter API.

    // This may need to be changed to whichever version is currently appropriate.

    TWRequest *postRequest = [[TWRequest alloc] initWithURL:[NSURL URLWithString:@"http://api.twitter.com/1/statuses/public_timeline.json"] parameters:nil requestMethod:TWRequestMethodGET];

    // Perform the request created above and create a handler block to handle the response.

    [postRequest performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {

        NSString *output;

        if ([urlResponse statusCode] == 200) {

            // Parse the responseData, which we asked to be in JSON format for this request, into an NSDictionary using NSJSONSerialization.

            NSError *jsonParsingError = nil;

            NSDictionary *publicTimeline = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&jsonParsingError];

            output = [NSString stringWithFormat:@"HTTP response status: %i\nPublic timeline:\n%@", [urlResponse statusCode], publicTimeline];

        }

        else {

            output = [NSString stringWithFormat:@"HTTP response status: %i\n", [urlResponse statusCode]];

        }

        [self performSelectorOnMainThread:@selector(displayText:) withObject:output waitUntilDone:NO];

    }];

}

- (void)displayText:(NSString *)text {

    self.outputTextView.text = text;

}

// This method checks if we are able to tweet from the application.

// We set the UI appropriately if Twitter is available and if a Twitter account is present.

// This is called when the app loads initially and if the ACAccountStore changes while the app is being used.

- (void)canTweetStatus {

    if ([TWTweetComposeViewController canSendTweet]) {

        self.easyTweetButton.enabled = YES;

        self.easyTweetButton.alpha = 1.0f;

        self.customTweetButton.enabled = YES;

        self.customTweetButton.alpha = 1.0f;

    } else {

        self.easyTweetButton.enabled = NO;

        self.easyTweetButton.alpha = 0.5f;

        self.customTweetButton.enabled = NO;

        self.customTweetButton.alpha = 0.5f;

    }

}

@end