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

import Foundation

class PenguinItemPresenter {

    private struct Constants {
        static let apiEndpoint = "https://users.windblume.net/~nick/upload/dummy.json"
    }
    
    let fetcher = ForayFetcher()
    
    func fetch() async -> [PenguinItemViewModel] {
        guard let endpoint = URL(string: Constants.apiEndpoint),
              let apiItems: [PenguinItemModel] = try? await fetcher.fetch(url: endpoint) else { return [] }
        return transform(models: apiItems)
    }
    
    private 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)
            }
    }
}