Questions+Syncano.swift

//
//  TestQuestions.swift
//  TestWarningsSwift
//
//  Created by Mariusz Wisniewski on 2/2/16.
//  Copyright © 2016 Mariusz Wisniewski. All rights reserved.
//

import Foundation
import syncano_ios

@objc enum QuestionType: Int {
    case MultipleChoice = 1
    case YesNo = 2
    case FillInTheBlank = 3
}

class Question : SCDataObject {
    var text = "" //on Syncano : String
    var answer = "" //on Syncano : String
    var answers : [String]? = nil //on Syncano : String (or Text)
    var type : QuestionType = .MultipleChoice //on Syncano : Integer
    var choices: [String]? = nil //on Syncano: String
    
    init(text:String, answer:String, type:QuestionType) {
        self.type = type
        self.text = text
        self.answer = answer
        super.init()
    }
    
    init(text:String, answers:[String], type:QuestionType) {
        self.type = type
        self.text = text
        self.answers = answers
        super.init()
    }
    
    override init() {
        super.init()
    }
    
    convenience init(fillInTheBlank text:String, answer:String ) {
        self.init(text: text,answer: answer,type: .FillInTheBlank)
    }
    
    convenience init(yesNo text:String, answer:String ) {
        self.init(text: text,answer: answer,type: .YesNo)
    }
    
    convenience init( multipleChoice text:String, answer:String, choices:[String]) {
        self.init(text: text,answer: answer,type: .MultipleChoice)
        self.choices = choices
    }
    
    required init!(coder: NSCoder!) {
        super.init(coder: coder)
    }
    
    required init(dictionary dictionaryValue: [NSObject : AnyObject]!) throws {
        try super.init(dictionary: dictionaryValue)
    }
    
    class func __jsonArrayValueTransformer() -> NSValueTransformer {
        return MTLValueTransformer(usingForwardBlock: { (answers, _, _) in
            if let answers = answers as? String {
                let data: NSData = answers.dataUsingEncoding(NSUTF8StringEncoding)!
                let anyObj: AnyObject? = try? NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions(rawValue: 0))
                return anyObj as! [String]
            }
            return nil
            }, reverseBlock: { (answers, _, _) in
                if let answers = answers as? [String] {
                    let data = try? NSJSONSerialization.dataWithJSONObject(answers, options: NSJSONWritingOptions(rawValue: 0))
                    let string = String(data: data!, encoding: NSUTF8StringEncoding)
                    return string!
                }
                return nil
        })
    }
    
    class func answersJSONTransformer() -> NSValueTransformer {
        return self.__jsonArrayValueTransformer()
    }
    
    class func choicesJSONTransformer() -> NSValueTransformer {
        return self.__jsonArrayValueTransformer()
    }
    
}

//usage example

    func testQuestions() {
        
        func getQuestions() {
            Question.please().giveMeDataObjectsWithCompletion { questions, error  in
                print("questions: \(questions), error: \(error)")
            }
        }
        
        func saveQuestion() {
            let question = Question(text: "asasas", answers: ["A","B", "C"], type: .MultipleChoice)
            question.choices = ["1", "2", "3"]
            question.saveWithCompletionBlock { _ in
            }
        }
    }