import UIKit
import Foundation

// MARK: - Math
struct Math: Codable {
    let classes: [Class]?
}

// MARK: - Class
struct Class: Codable {
    let calculus: [Calculus]?
}

// MARK: - Calculus
struct Calculus: Codable {
    let question: String?
    let options: [String]?
    let answer: String?
}
func getMath() -> Math
{
    var math: Math?
    var requestDone: Bool = false
    let url = URL(string: "https://mathquestioneditor.herokuapp.com")
    let request = NSMutableURLRequest(url:url!);
    let task = URLSession.shared.dataTask(with: request as URLRequest) { (data, response, error) in
        if error == nil {
            math = try? JSONDecoder().decode(Math.self, from: data!)
            requestDone = true
        }
        else {
            print(error ?? "error within error")
//            return nil
            }
        }
    task.resume()
    while (true)
    {
        if (requestDone)
        {
            return math!
        }
    }
}
var json: Math! = getMath()
for i in 0...(json!.classes![0].calculus!.count-1)
{
    print(json!.classes![0].calculus![i].question!)
    print(json!.classes![0].calculus![i].options![0])
    print(json!.classes![0].calculus![i].options![1])
    print(json!.classes![0].calculus![i].options![2])
    print(json!.classes![0].calculus![i].options![3])
    print(json!.classes![0].calculus![i].answer!)
    print()
}