djid_sirani_ios/Sirani/View/News/Index/NewsPresenter.swift

//
//  NewsPresenter.swift
//  Sirani
//
//  Created by Anhar Solehudin on 06/04/19.
//  Copyright © 2019 Anhar Solehudin. All rights reserved.
//

import Foundation
import SwiftyJSON

class NewsPresenter {
    
    private let siraniApiServices: SiraniApiServices
    weak private var view: NewsViewDelegate?
    
    init(siraniApiServices: SiraniApiServices) {
        self.siraniApiServices = siraniApiServices
    }
    
    func attachView(view: NewsViewDelegate?) {
        self.view = view
    }
    
    func detachView() {
        self.view = nil
    }
    
    func loadData(cursor: Int, prev: Int, jenis: String, columns: String, keyword: String) {
        self.view?.hideNoDataLayout()
        self.view?.showLoading()
        
        var dataList = [News]()
        siraniApiServices.postToGetNews(cursor: cursor, prev: prev, jenis: jenis, columns: columns, keyword: keyword).responseJSON { response in
            if response.error == nil {
                guard let data = response.data else { return }
                if let json = try? JSON(data: data) {
                    if let data = json["data"].array {
                        if data.count > 0 {
                            for item in data {
                                let news = News(
                                    id: item["id"].intValue,
                                    title_news: item["title_news"].stringValue,
                                    pra_news: item["pra_news"].stringValue,
                                    create_date: item["create_date"].stringValue,
                                    thumb_filename: item["thumb_filename"].stringValue
                                )
                                dataList.append(news)
                            }
                            self.setDataList(dataList: dataList)
                        } else {
                            if cursor > 0 {
                                self.setDataList(dataList: dataList)
                            } else {
                                self.showNoData()
                            }
                        }
                    } else {
                        self.showNoData()
                    }
                } else {
                    self.showNoData()
                }
            } else {
                self.showNoData()
            }
        }
    }
    
    // other functions
    private func setDataList(dataList: [News]) {
        self.view?.setDataList(dataList: dataList)
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.6) {
            self.view?.hideLoading()
        }
    }
    
    private func showNoData() {
        DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
            self.view?.showNoDataLayout()
            self.view?.hideLoading()
        }
    }
}