StoreReviewHelper.swift

//
//  AppRater.swift
//
//  Created by Devi Prasad Ghimire on 6/12/19.
//

import Foundation
import StoreKit


fileprivate struct UserDefaultsKeys {
    // Reviews
    static let lastVersionPromptedForReviewKey = "LAST_VERSION_PROMOTED_FOR_REVIEW"
    // Counts
    static let appLaunchCountKey = "APP_OPENED_COUNT"
}

let deault = UserDefaults.standard

struct StoreReviewHelper {
    ///called from appdelegate didfinishLaunchingWithOptions:
    static func incrementAppOpenedCount() {
        guard var appOpenCount = deault.value(forKey: UserDefaultsKeys.appLaunchCountKey) as? Int else {
            deault.set(1, forKey: UserDefaultsKeys.appLaunchCountKey)
            return
        }
        appOpenCount += 1
        deault.set(appOpenCount, forKey: UserDefaultsKeys.appLaunchCountKey)
    }
    
    // call this whenever appropriate
    static func checkAndAskForReview() {
        // this will not be shown everytime. Apple has some internal logic on how to show this.
        guard let appOpenCount = deault.value(forKey: UserDefaultsKeys.appLaunchCountKey) as? Int else {
            deault.set(1, forKey: UserDefaultsKeys.appLaunchCountKey)
            return
        }
        
        switch appOpenCount {
        case 10,50:
            StoreReviewHelper().requestReview()
        case _ where appOpenCount%100 == 0 :
            StoreReviewHelper().requestReview()
        default:
            print("App run count is : \(appOpenCount)")
            break;
        }
        
    }
    
    fileprivate func requestReview() {
        if #available(iOS 10.3, *) {
            SKStoreReviewController.requestReview()
        } else {
            // Fallback on earlier versions
            // Try any other 3rd party or manual method here.
        }
    }
}