ViewController.swift

//
//  ViewController.swift
//  AirportTimeTable
//
//  Created by Maksim Vialykh on 01.08.2018.
//  Copyright © 2018 Vialyx. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    // TODO: - Inject it from outside
    lazy var model: ModelInput! = { [unowned self] in
        let model = Model()
        model.output = self
        return model
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        model.load()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

// MARK: - ModelOutput
extension ViewController: ModelOutput {
    
    func modelDidLoad() {
        print("modelDidLoad with items: \(model.items)")
    }
    
    func modelDidFail(error: Error?) {
        print("modelDidFail with error: \(String(describing: error))")
    }
    
}

// FIXME: - Move out Model to the separated .swift file
struct Data: Codable {
    let company_name: String
    let departure_time: String
    let flight: String
    let direction: String
    let reseption: String
    let gate: String
    let status: String
}

protocol ModelInput {
    var items: [Data] { get }
    func load()
}

protocol ModelOutput: class {
    func modelDidLoad()
    func modelDidFail(error: Error?)
}

final class Model: ModelInput {
    
    private (set) var items: [Data] = []
    weak var output: ModelOutput!
    
    func load() {
        let url = URL(string: "http://localhost:8080/departure")!
        let request = URLRequest(url: url)
        let task = URLSession.shared.dataTask(with: request) { [weak self] (data, response, error) in
            guard let `data` = data else {
                self?.output.modelDidFail(error: error)
                return
            }
            do {
                self?.items = try JSONDecoder().decode([Data].self, from: data)
                self?.output.modelDidLoad()
            } catch {
                self?.output.modelDidFail(error: error)
            }
        }
        task.resume()
    }
    
}