fetch timeline

fetchTimeLine.swift

func fetchTimeLine (timelineType: String, userScreenname: String?, completionHandler: (errorDescription : String?, tweets : [Tweet]?) -> Void) {
        let accountStore = ACAccountStore()
        let accountType = accountStore.accountTypeWithAccountTypeIdentifier(ACAccountTypeIdentifierTwitter)
        
        /*  The following is asynchronous.
        We will ask for account access, set up a twitter request, then call the home timeline   */
        
        accountStore.requestAccessToAccountsWithType(accountType, options: nil) { (granted: Bool, error: NSError!) -> Void in
            if granted {
                
                /* User gave access */
                let accounts = accountStore.accountsWithAccountType(accountType)
                self.twitterAccount = accounts.first as? ACAccount
                /* Set up our twitter request, depending on which timeline is requested*/
                var timelineURL : NSURL?
                var parameters: Dictionary<String, String>?
                switch timelineType {
                case "HOME":
                    timelineURL = NSURL(string: "https://api.twitter.com/1.1/statuses/home_timeline.json")
                case "USER":
                    timelineURL = NSURL(string: "https://api.twitter.com/1.1/statuses/user_timeline.json")
                    parameters = ["screen_name": userScreenname!]
                    println(userScreenname!)
                default:
                    println("That timeline type doesn't work")
                }
                
                let twitterRequest = SLRequest(forServiceType: SLServiceTypeTwitter, requestMethod: SLRequestMethod.GET, URL: timelineURL, parameters: parameters)
                twitterRequest.account = self.twitterAccount
                /* Make network call/request */
                twitterRequest.performRequestWithHandler({ (timeLineJSONData, httpResponse, error) -> Void in
                    if error == nil {
                        switch httpResponse.statusCode {
                            
                        case 200...299:
                            let tweets = Tweet.parseJSONDataIntoTweets(timeLineJSONData)
                            //var error : NSError?
                            //let JSONArray = NSJSONSerialization.JSONObjectWithData(timeLineJSONData, options: nil, error: &error) as? NSArray
                            //println(JSONArray)
                            //println(tweets?.count)
                            NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
                                completionHandler(errorDescription: nil, tweets: tweets)
                            })
                        case 400...499:
                            println("error on the client")
                            println(httpResponse.description)
                            completionHandler(errorDescription: "The connection is having problems", tweets: nil)
                        case 500...599:
                            println("error on the server")
                        default:
                            println("something bad happened")
                            
                        }
                    }
                    else {
                        println(error)
                    }
                })
            }
                
            else {
                
            }
        }
        

    }