//
//  SplashScreenViewModel.swift
//  LMS
//
//  Created by Suraj Kumar Mandal on 31/08/22.
//

import Foundation
import Alamofire
import JWTDecode

class SplashScreenViewModel {
    
    var delegate: SplashScreenViewProtocol?
    
    func getAccessToken() {
        if let delegate = delegate {
            let url = ApiURL.AccessToken
            let email = UserDefaults.standard.value(forKey: "userName") as! String
            let password = UserDefaults.standard.value(forKey: "password") as! String
            
            let parameters: [String: String] = [
                "username" : email,
                "password" : password,
                "client_id" : AppConstant.ClientId,
                "client_secret" : AppConstant.ClientSecret,
                "grant_type" : "password"
            ]
            print(parameters)
            
            AF.request(url, 
                       method: .post,
                       parameters: parameters,
                       encoding: URLEncoding.default)
            .responseJSON { response in
                if response.response?.statusCode == 200 {
                    switch response.result {
                    case .success(_):
                        do {
                            // Handle as previously success
                            if let json = response.value {
                                let data = json as! [String:AnyObject]
                                print(data)
                                
                                let accessToken = data["access_token"] as? String
                                let expiresIn = data["expires_in"] as? Int
                                let refreshExpiresIn = data["refresh_expires_in"] as? Int
                                let refreshToken = data["refresh_token"] as? String
                                let tokenType = data["token_type"] as? String
                                let sessionState = data["session_state"] as? String
                                let scope = data["scope"] as? String
                                let notBeforePolicy = data["not-before-policy"] as? Int
                                print("Access Token: \(accessToken ?? "")")
                                
                                let jwt = try decode(jwt: accessToken!)
                                
                                UserDefaults.standard.set(accessToken, forKey: "accessToken")
                                UserDefaults.standard.set(refreshToken, forKey: "refreshToken")
                                UserDefaults.standard.set(expiresIn, forKey: "tokenExpire")
                                UserDefaults.standard.set(true, forKey: "isLogin")
                                UserDefaults.standard.set(jwt.subject, forKey: "decryptedToken")
                                UserDefaults.standard.synchronize()
                                
                                delegate.navigateToHome()
                            }
                        } catch {
                            print("Error while decoding response: \(error)")
                        }
                        
                        break
                    case .failure(let error):
                        print(error.localizedDescription)
                        break
                    }
                }
            }
        }
    }
    
    func refreshToken() {
        let url = ApiURL.AccessToken
        let refreshToken = UserDefaults.standard.value(forKey: "refreshToken") as! String
        
        let parameters: [String: String] = [
            "refresh_token" : refreshToken,
            "client_id" : AppConstant.ClientId,
            "client_secret" : AppConstant.ClientSecret,
            "grant_type" : "refresh_token"
        ]
        print(parameters)
        
        AF.request(url, method: .post, parameters: parameters, encoding: URLEncoding.httpBody).responseJSON { (response) in
            if response.response?.statusCode == 200 {
                switch response.result {
                case .success(_):
                    do {
                        if let json = response.value {
                            let data = json as! [String:AnyObject]
                            print(data)
                            
                            let accessToken = data["access_token"] as? String
                            let expiresIn = data["expires_in"] as? Int
                            let refreshExpiresIn = data["refresh_expires_in"] as? Int
                            let refreshToken = data["refresh_token"] as? String
                            let tokenType = data["token_type"] as? String
                            let sessionState = data["session_state"] as? String
                            let scope = data["scope"] as? String
                            let notBeforePolicy = data["not-before-policy"] as? Int
                            print("Access Token: \(accessToken)")
                            
                            let jwt = try decode(jwt: accessToken!)
                            
                            UserDefaults.standard.set(accessToken, forKey: "accessToken")
                            UserDefaults.standard.set(refreshToken, forKey: "refreshToken")
                            UserDefaults.standard.set(jwt.subject, forKey: "decryptedToken")
                            UserDefaults.standard.synchronize()
                        }
                    } catch {
                        print("Error while decoding response: \(error)")
                    }
                    break
                case .failure(let error):
                    print(error.localizedDescription)
                    break
                }
            }
        }
    }
    
}

protocol SplashScreenViewProtocol {
    func navigateToHome()
}