//
//  ViewController.swift
//  Sunny
//
//  Created by Ivan Akulov on 24/02/2020.
//  Copyright © 2020 Ivan Akulov. All rights reserved.
//

import UIKit
import CoreLocation

class ViewController: UIViewController {

    @IBOutlet weak var weatherIconImageView: UIImageView!
    @IBOutlet weak var cityLabel: UILabel!
    @IBOutlet weak var temperatureLabel: UILabel!
    @IBOutlet weak var feelsLikeTemperatureLabel: UILabel!

    var networkWeatherManager = NetworkWeatherManager()
    lazy var locationManager: CLLocationManager = {
        let lm = CLLocationManager()
        lm.delegate = self
        lm.desiredAccuracy = kCLLocationAccuracyKilometer
        lm.requestWhenInUseAuthorization()
        return lm
    }()

    @IBAction func searchPressed(_ sender: UIButton) {
        self.presentSearchAlertController(withTitle: "Enter city name", message: nil, style: .alert) { [unowned self] city in
            self.networkWeatherManager.fetchCurrentWeather(forRequestType: .cityName(city: city))
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        networkWeatherManager.onCompletion = { [weak self] currentWeather in
            guard let self = self else { return }
            self.updateInterfaceWith(weather: currentWeather)
        }

        if CLLocationManager.locationServicesEnabled() {
            locationManager.requestLocation()
        }

    }

    func updateInterfaceWith(weather: CurrentWeather) {
        DispatchQueue.main.async {
            self.cityLabel.text = weather.cityName
            self.temperatureLabel.text = weather.temperatureString
            self.feelsLikeTemperatureLabel.text = weather.feelsLikeTemperatureString
            self.weatherIconImageView.image = UIImage(systemName: weather.systemIconNameString)
        }
    }

}

// MARK: - CLLocationManagerDelegate
extension ViewController: CLLocationManagerDelegate {
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        guard let location = locations.last else { return }
        let latitude = location.coordinate.latitude
        let longitude = location.coordinate.longitude

        networkWeatherManager.fetchCurrentWeather(forRequestType: .coordinate(latitude: latitude, longitude: longitude))
    }

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        print(error.localizedDescription)
    }
}