//
//  Network.swift
//  Werkout_ios
//
//  Created by Trey Tartt on 6/19/23.
//

import Foundation

enum FetchableError: Error {
    case apiError(Error)
    case noData
    case decodeError(Error)
    case endOfFileError
}

protocol Fetchable {
    associatedtype Response: Codable
    
    var baseURL: String { get }
    var endPoint: String { get }
    
    func fetch(completion: @escaping (Result<Response, FetchableError>) -> Void)
}

extension Fetchable {
    var baseURL: String {
        "http://127.0.0.1:8000/"
    }
    
    func fetch(completion: @escaping (Result<Response, FetchableError>) -> Void) {
        let url = URL(string: baseURL+endPoint)!
        
        let task = URLSession.shared.dataTask(with: url, completionHandler: { (data, response, error) in
            if let error = error {
                completion(.failure(.apiError(error)))
                return
            }
            guard let data = data else {
                completion(.failure(.noData))
                return
            }
            
            do {
                let model = try JSONDecoder().decode(Response.self, from: data)
                completion(.success(model))
                return
            } catch {
                completion(.failure(.decodeError(error)))
                return
            }
            completion(.failure(.endOfFileError))
        })
        
        task.resume()
    }
}