LONDON-IOS/GMERemittance/Notification/NotificationViewModel.swift

//
//  NotificationViewModel.swift
//  GMERemittance
//
//  Created by FMI-12 on 3/9/18.
//  Copyright © 2018 Gobal Money Express Co. Ltd. All rights reserved.
//

import Foundation

class NotificationViewModel: ModelExtension {
    
    let userId = UserDefaults.standard.object(forKey: "com.gmeremit.username") as? String
    var notificationFetch: Box<Bool?> = Box(nil)
    var notificationPatch: Box<Bool?> = Box(nil)
    var notificationConnectionTimeOut: Box<Bool?> = Box(nil)
    
    var notificationArray: [NotificationModel] = [NotificationModel] ()
    private var viewedNotification: NotificationModel = NotificationModel()
    
    /**
        Api request for notification for user
     */
    func fetchNotification(){
        if !Reachability.isConnectedToNetwork() {
            self.internetConnection.value = false
        } else {
            RestApiMananger.sharedInstance.getNotification(userId: userId!) { result in
                switch result {
                case let .success(fetchedJSON):
                    self.notificationArray.removeAll()
                    guard fetchedJSON.count > 0 else {
                        self.notificationFetch.value = true
                        return
                    }
                    for i in 0 ... (fetchedJSON.count-1) {
                        do {
                            let notification = try JSONDecoder().decode(NotificationModel.self, from: fetchedJSON[i].rawData())
                            self.notificationArray.append(notification)
                            
                        } catch {
                            self.notificationFetch.value = false
                        }
                    }
                    
                    self.notificationFetch.value = true
                    
                case let .failure(errorJSON):
                    self.setErrorMessage(message: errorJSON["message"].stringValue)
                    self.notificationFetch.value = false
                    
                case .updateAccessCode:
                    RestApiMananger.sharedInstance.updateAccessCode(userId: self.userId!, password: self.getLoginPassword()) {
                        result in
                        if result != "Error"{
                            let uuid = RestApiMananger.sharedInstance.getUUID()
                            UserDefaults.standard.set((result + ":" + uuid).toBase64(), forKey: "com.gmeremit.accessCode")
                            self.fetchNotification()
                        }
                    }
                case .logOutUser():
                    RestApiMananger.sharedInstance.cancelExistingNetworkCalls()
                    self.anotherLogin.value = true
                case .timeOut:
                    self.notificationConnectionTimeOut.value = false
                }
            }
        }
    }
    
    
    /**
        Notification Pagination
     - parameter page: page number
     - parameter size: Size of notification list
     */
    func fetchNotification(page:Int,size:Int){
        
        if !Reachability.isConnectedToNetwork() {
            self.internetConnection.value = false
        } else {
            RestApiMananger.sharedInstance.getNotification(userId: userId!,page: page,size: size) { result in
                switch result {
                case let .success(fetchedJSON):
                    self.notificationArray.removeAll()
                    guard fetchedJSON.count > 0 else {
                        self.notificationFetch.value = true
                        return
                    }
                    for i in 0 ... (fetchedJSON.count-1) {
                        do {
                            let notification = try JSONDecoder().decode(NotificationModel.self, from: fetchedJSON[i].rawData())
                            self.notificationArray.append(notification)
                            
                        } catch {
                            self.notificationFetch.value = false
                        }
                    }
                    
                    self.notificationFetch.value = true
                    
                case let .failure(errorJSON):
                    self.setErrorMessage(message: errorJSON["message"].stringValue)
                    self.notificationFetch.value = false
                    
                case .updateAccessCode:
                    RestApiMananger.sharedInstance.updateAccessCode(userId: self.userId!, password: self.getLoginPassword()) {
                        result in
                        if result != "Error"{
                            let uuid = RestApiMananger.sharedInstance.getUUID()
                            UserDefaults.standard.set((result + ":" + uuid).toBase64(), forKey: "com.gmeremit.accessCode")
                            self.fetchNotification(page:page, size:size)
                        }
                    }
                case .logOutUser():
                    RestApiMananger.sharedInstance.cancelExistingNetworkCalls()
                    self.anotherLogin.value = true
                case .timeOut:
                    self.notificationConnectionTimeOut.value = false
                }
            }
        }
    }
    
    /**
        Api request for clicked notifications
     - parameter notificaitonId: notification id number
     - parameter viewed: status of notification
     */
    func patchNotification(notificaitonId: String, viewed: String){
        
        if !Reachability.isConnectedToNetwork() {
            self.internetConnection.value = false
        } else {
            RestApiMananger.sharedInstance.patchNotification(notificationId: notificaitonId, viewed: viewed){ result in
                switch result {
                case .success(_):
                    self.notificationPatch.value = true
                case let .failure(errorJSON):
                    self.setErrorMessage(message: errorJSON["message"].stringValue)
                    self.notificationPatch.value = false
                case .updateAccessCode:
                    RestApiMananger.sharedInstance.updateAccessCode(userId: self.userId!, password: self.getLoginPassword()) {
                        result in
                        if result != "Error"{
                            let uuid = RestApiMananger.sharedInstance.getUUID()
                            UserDefaults.standard.set((result + ":" + uuid).toBase64(), forKey: "com.gmeremit.accessCode")
                            self.patchNotification(notificaitonId: notificaitonId, viewed: viewed)
                        }
                    }
                case .logOutUser():
                    RestApiMananger.sharedInstance.cancelExistingNetworkCalls()
                    self.anotherLogin.value = true
                case .timeOut:
                    return self.notificationConnectionTimeOut.value = false
                }
            }
        }
        
    }
    
    /**
     returns: array count
     */
    func getCount() -> Int {
        return notificationArray.count
    }
    
    /**
     returns: notification array
     */
    func getNotificationArray() -> [NotificationModel] {
        return notificationArray
    }
    
    /**
        To get notification
     - parameter index: position of notification in an array
     - returns: notification
     */
    func getNotification(index: Int) -> NotificationModel {
        return notificationArray[index]
    }
    
    /**
     To get notification id
     - parameter index: position of notification Id in an array
     - returns: notification id
     */
    func getNotificationId(index:Int) -> String {
        
        if let getNotificationId =  notificationArray[index].notificationId{
            return getNotificationId
        }
        else {
            return "N/A"
        }
    }
    
    /**
     To get notification date
     - parameter index: position of notification  date in an array
     - returns: notification date
     */
    func getDate(index:Int) -> String {
        
        if let getDate =  notificationArray[index].createdDate{
            return getDate
        }
        else {
            return "N/A"
        }
    }
    
    /**
     To get notification message
     - parameter index: position of notification message in an array
     - returns: notification message
     */
    func getNotificationMessage(index:Int) -> String {
        
        if let getNotificationMessage =  notificationArray[index].notificationMessage{
            return getNotificationMessage
        }
        else {
            return "N/A"
        }
    }
    
    /**
     To get notifier image url
     - parameter index: position of notifier image url in an array
     - returns: url
     */
    func getNotifireImageURL(index: Int) -> String {
        if let getNotifireImageURL = notificationArray[index].notifierUrl{
            return getNotifireImageURL
        } else {
            return ""
        }
    }
    
    /**
     To get notification code
     - parameter index: position of notification code in an array
     - returns: notification code
     */
    func getNotificationCode(index: Int) -> String {
        if let getNotificationCode = notificationArray[index].notificationCode{
            return getNotificationCode
        } else {
            return "N/A"
        }
    }
    
    /**
     To get notification
     - parameter index: position of notification in an array
     - returns: notification
     */
    func showNotification() -> Bool {
        for i in 0..<notificationArray.count {
            if !notificationArray[i].viewed{
                return true
            }
        }
        return false
    }
}