/
WeatherService.swift
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/
WeatherService.swift
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//
// WeatherService.swift
// Simple-Weather-App
//
// Created by Petro Korienev on 10/30/17.
// Copyright © 2017 Sigma Software. All rights reserved.
//
import Foundation
import Alamofire
import ReactiveSwift
import ObjectMapper
class WeatherService {
private struct Constants {
static let apiKey = "z74X7aKpZlip02a5Wlrq9R70JkDnOZsq"
}
static let shared: WeatherService = WeatherService()
fileprivate lazy var sessionManager: SessionManager = self.setupSessionManager()
fileprivate let appStore: AppStore = AppStore.shared
private init() {
setupObserving()
}
private func setupObserving() {
let locationProducer = self.appStore.producer
.map { $0.location.locationRequestState }
.filter { $0.isSuccess }
.skipRepeats()
.observe(on: QueueScheduler.main)
locationProducer.startWithValues { [weak self] _ in self?.appStore.consume(event: .geopositionRequest )}
let geopositionProducer = self.appStore.producer
.map { $0.weather.geopositionRequestState }
.skipRepeats() // To use skipRepeats we have to implement equatable for GeopositionRequestState
.observe(on: QueueScheduler.main)
geopositionProducer
.filter { $0 == .updating }
.startWithValues { [weak self] _ in self?.performGeopositionRequest() }
geopositionProducer
.filter { $0.isSuccess }
.startWithValues { [weak self] _ in self?.appStore.consume(event: .weatherRequest )}
let weatherProducer = self.appStore.producer
.map { $0.weather.weatherRequestState }
.filter { $0 == .updating }
.skipRepeats() // To use skipRepeats we have to implement equatable for WeatherRequestState
.observe(on: QueueScheduler.main)
weatherProducer.startWithValues { [weak self] _ in self?.performWeatherRequest() }
}
private func setupSessionManager() -> SessionManager {
return SessionManager.default // let's use very default for simplicity
}
}
extension WeatherService {
fileprivate func performGeopositionRequest() {
guard case .success(let latitude, let longitude, _) = self.appStore.value.location.locationRequestState else {
// There should be assertion thrown here, but for safety let's error the request
self.appStore.consume(event: .geopositionResult(geoposition: nil, error: AppError.inconsistentStateGeoposition))
return
}
sessionManager
.request(
"https://dataservice.accuweather.com/locations/v1/cities/geoposition/search",
method: .get,
parameters: ["q": "\(latitude),\(longitude)", "apikey": Constants.apiKey])
.responseJSON { [weak self] (dataResponse) in
switch (dataResponse.result) {
case .failure(let error): self?.appStore.consume(event: .geopositionResult(geoposition: nil, error: error))
case .success(let value):
guard let json = value as? [String: Any] else {
self?.appStore.consume(event: .geopositionResult(geoposition: nil, error: AppError.inconsistentAlamofireBehaviour))
return
}
do {
let geoposition = try Geoposition(JSON: json)
self?.appStore.consume(event: .geopositionResult(geoposition: geoposition, error: nil))
} catch (let error) {
self?.appStore.consume(event: .geopositionResult(geoposition: nil, error: error))
}
}
}
}
fileprivate func performWeatherRequest() {
guard case .success(let geoposition) = self.appStore.value.weather.geopositionRequestState else {
// There should be assertion thrown here, but for safety let's error the request
self.appStore.consume(event: .weatherResult(current: nil, forecast: nil, error: AppError.inconsistentStateWeather))
return
}
performCurrentConditionsRequest(for: geoposition.key)
}
private func performCurrentConditionsRequest(for key: String) {
sessionManager
.request(
"https://dataservice.accuweather.com/currentconditions/v1/\(key)",
method: .get,
parameters: ["details": "true", "apikey": Constants.apiKey])
.responseJSON { [weak self] (dataResponse) in
switch (dataResponse.result) {
case .failure(let error): self?.appStore.consume(event: .weatherResult(current: nil, forecast: nil, error: error))
case .success(let value):
guard let responseJson = value as? [[String: Any]],
let weatherJson = responseJson.first else {
self?.appStore.consume(event: .weatherResult(current: nil, forecast:nil, error: AppError.inconsistentAlamofireBehaviour))
return
}
do {
let weather = try Weather(JSON: weatherJson)
self?.performForecastRequest(for: key, currentConditions: weather)
} catch (let error) {
self?.appStore.consume(event: .weatherResult(current: nil, forecast: nil, error: error))
}
}
}
}
private func performForecastRequest(for key: String, currentConditions: Weather) {
sessionManager
.request(
"https://dataservice.accuweather.com/forecasts/v1/daily/5day/\(key)",
method: .get,
parameters: ["details": "true", "apikey": Constants.apiKey])
.responseJSON { [weak self] (dataResponse) in
switch (dataResponse.result) {
case .failure(let error): self?.appStore.consume(event: .weatherResult(current: nil, forecast: nil, error: error))
case .success(let value):
guard let rootJson = value as? [String: Any],
let forecastsJson = rootJson["DailyForecasts"] as? [[String:Any]] else {
self?.appStore.consume(event: .weatherResult(current: nil, forecast:nil, error: AppError.inconsistentAlamofireBehaviour))
return
}
do {
let forecasts = try Mapper<Weather>().mapArray(JSONArray: forecastsJson)
self?.appStore.consume(event: .weatherResult(current: currentConditions,
forecast: forecasts,
error: nil))
} catch (let error) {
self?.appStore.consume(event: .weatherResult(current: nil, forecast: nil, error: error))
}
}
}
}
}