playViewModel.swift

//
//  PlayViewModel.swift
//  brasileirao
//
//  Created by Alcides Junior on 15/03/20.
//

import Foundation

typealias updateClosure = ()->()

final class PlayViewModel {
    
    fileprivate var networkManager = NetWorkManager()
    fileprivate var playPersistence = PlayManager()
    fileprivate let defaults = UserDefaults.standard
    
    var plays: [PlayElement] = []{
        didSet{
            DispatchQueue.main.async {
                self.updatedList?()
            }
        }
    }
    var updatedList: updateClosure?
    var totalPages: Int = 1
    var totalResults: Int = 0
    var currentRound: Int = 1
    
    init(){
        fetchPlays(currentRound: currentRound)
    }
    
    func fetchPlays(currentRound: Int =  1){
        if CheckInternet.Connection(){
            self.networkManager.get(T: Play.self, service: .plays(round: currentRound)) {[weak self] data in
                switch data{
                case .success(let playResult):
                    DispatchQueue.main.async {
                        self?.totalPages = playResult.totalPages
                        self?.totalResults = playResult.plays.count
                        self?.defaults.set(self?.totalPages, forKey: "totalPages")
                        self?.plays.removeAll()
                        playResult.plays.forEach {
                            self?.plays.append($0)
                            //verifying if current data exists in core data
                            if self?.playPersistence.dataExist(id: $0.id) == false {
                                //inserting data into coredata
                                self?.playPersistence.createData(playElement: $0)
                            }
                        }
                    }
                case .failure(let error):
                    print(error)
                }
                
            }
        } else {
            
            //access and retrieving local data
            let playResults = self.playPersistence.retrieveData(round: currentRound)
            self.plays.removeAll()
            playResults?.forEach({ (playResult) in
                let team1 = Team(id: 0, name: "", shortname: playResult.value(forKey: "shortname1") as! String, shield: "")
                let team2 = Team(id: 0, name: "", shortname: playResult.value(forKey: "shortname2") as! String, shield: "")
                let element = PlayElement(id: playResult.value(forKey: "id") as! Int, teams: [team1, team2], score1: playResult.value(forKey: "score1") as! Int, score2: playResult.value(forKey: "score2") as! Int, datetime: playResult.value(forKey: "datetime") as? String, place: playResult.value(forKey: "place") as? String, round: playResult.value(forKey: "round") as! Int)
                plays.append(element)
            })
            self.totalResults = plays.count
            self.totalPages = defaults.integer(forKey: "totalPages")
            
        }
        
    }
    
    func result(_ id: Int = 0)->PlayElement{
        return self.plays[id]
    }
}