WeatherManager.swift

import Foundation

class WeatherManager : ObservableObject {
    
    @Published var tempText : Double = 0.0
    @Published var conditionImage : Int = 0
    @Published var cityName = ""
    
    let weatherURL = "https://api.openweathermap.org/data/2.5/weather?appid={YOUR API KEY}&units=metric"
    
    
    func fetchWeather(cityName : String){
        let urlString = "\(weatherURL)&q=\(cityName)"
        
        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, completionHandler: handle(data:response:error:))
            
            task.resume()
        }
    }
    
    func handle(data : Data? , response : URLResponse? , error : Error?){
        guard error == nil else {
            print("Error while handling the request")
            return
        }
        
        if let safeData = data {
            if let weather = parseJSON(safeData){
                DispatchQueue.main.async {
                    self.tempText = weather.main.temp
                    self.cityName = weather.name
                    self.conditionImage = weather.weather[0].id
                }
            }
        }
        
    }
    
    func parseJSON(_ weatherData : Data) -> WeatherData? {
        let decoder = JSONDecoder()
        do {
            let decodedData = try decoder.decode(WeatherData.self, from: weatherData)
            return decodedData
        } catch {
            print("Error while parsing")
            return nil
        }
    }
       
}