Clima-iOS13/WeatherManager.swift at main · freitaspedro/Clima-iOS13 · GitHub

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//
//  WeatherManager.swift
//  Clima
//
//  Created by Pedro Freitas | Zoop on 25/11/20.
//  Copyright © 2020 App Brewery. All rights reserved.
//

import Foundation
import CoreLocation

protocol WeatherManagerDelegate {
    func didUpdateWeather(_ weatherManager: WeatherManager, weather: WeatherModel)
    func didFailWithError(error: Error)
}

struct WeatherManager {
    let weatherURL = "https://api.openweathermap.org/data/2.5/weather?appid=159f4a4693174dc5cec4d845b5d84d2e&units=metric"

    var delegate: WeatherManagerDelegate?

    func fetchWeather(cityName: String) {
        let urlString = "\(weatherURL)&q=\(cityName)"
        performRequest(with: urlString)
    }

    func fetchWeather(latitude: CLLocationDegrees, longitude: CLLocationDegrees) {
        let urlString = "\(weatherURL)&lat=\(latitude)&lon=\(longitude)"
        performRequest(with: urlString)
    }

    func performRequest(with urlString: String) {
        if let url = URL(string: urlString) {
            let session = URLSession(configuration: .default)
            let task = session.dataTask(with: url) { (data, response, error) in
                if error != nil {
                    self.delegate?.didFailWithError(error: error!)
                    return
                }
                if let safeData = data {
                    if let weather = parseJSON(safeData) {
                        self.delegate?.didUpdateWeather(self, weather: weather)
                    }
                }
            }
            task.resume()
        }
    }

    func parseJSON(_ weatherData: Data) -> WeatherModel? {
        let decoder = JSONDecoder()
        do {
            let decodeData = try decoder.decode(WeatherData.self, from: weatherData)
            let id = decodeData.weather[0].id
            let temp = decodeData.main.temp
            let name = decodeData.name

            let weather = WeatherModel(conditionId: id, cityName: name, temperature: temp)
            return weather

        } catch {
            delegate?.didFailWithError(error: error)
            return nil
        }
    }

}