NookPlazaAPIService.swift

import Foundation
import Combine

public struct NookPlazaAPIService {
    private static let decoder = JSONDecoder()
    private static let apiQueue = DispatchQueue(label: "nookazon_api",
                                                qos: .userInitiated,
                                                attributes: .concurrent)
            
    public static func fetch<T: Codable>(endpoint: Category) -> AnyPublisher<T ,APIError> {
        Result(catching: {
            guard let url = Bundle.main.url(forResource: endpoint.rawValue, withExtension: nil) else {
                throw APIError.message(reason: "Error while loading local ressource")
            }
            return try Data(contentsOf: url)
        })
        .publisher
        .decode(type: T.self, decoder: Self.decoder)
        .mapError{ APIError.parseError(reason: $0.localizedDescription) }
        .subscribe(on: Self.apiQueue)
        .eraseToAnyPublisher()
    }
}