//
//  PenguinItemPresenter.swift
//  foray
//
//  Created by Nicholas Tay on 24/3/2022.
//

import Foundation

class PenguinItemPresenter {
    
    let fetcher = ForayFetcher()
    
    func fetch(receiver: @escaping ([PenguinItemViewModel]) -> ()) {
        fetcher.fetch(url: "https://users.windblume.net/~nick/upload/dummy.json") { [weak self] (apiItems: [PenguinItemModel]) in
            // Callback to main thread here
            // There probably is a nicer way to do it, but we will DispatchQueue it back
            // from the Presenter-level for now (main thread from VC onwards)
            DispatchQueue.main.async {
                guard let self = self else { return }
                receiver(self.transform(models: apiItems))
            }
        }
    }
    
    func transform(models: [PenguinItemModel]) -> [PenguinItemViewModel] {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"
        
        return models
            .sorted { $0.releaseDate < $1.releaseDate }
            .map {
                PenguinItemViewModel(type: $0.type,
                                     releaseDateFormatted: dateFormatter.string(from: $0.releaseDate),
                                     year: Calendar.current.component(.year, from: $0.releaseDate),
                                     id: $0.id, name: $0.name)
            }
    }
}