//
//  ProjectClock
//
//  Created by Hykilpikonna on 1/8/21.
//

import Foundation

/// Base URL of the HTTP server
let baseUrl = "http://localhost:8080/api" // TODO: Production settings

/// API class
struct API<T>
{
    let loc: String
}

/// Class to store static API endpoints
class APIs
{
    /**
     Register the user in the database.
     
     ## Parameters
     - name: The user's name (this is not username because it doesn't have to be unique)
     - email: The user's email (this does have to be unique)
     - pass: Password (initial hash)
     
     ## Returns
     Success or error
     */
    static let register = API<String>(loc: "/user/register")
    
    /**
     Delete a user from the database.
     
     ## Parameters
     - email: The user's email
     - pass: Password (initial hash)
     
     ## Returns
     Success or error
     */
    static let delete = API<String>(loc: "/user/delete")
    
    private init() {}
}

/// Build a URL with the node path and params
func createUrl(_ node: String, _ params: [String: String]? = [:]) -> URL
{
    var url = URLComponents(string: baseUrl + node)
    if let params = params
    {
        url?.queryItems = params.map { URLQueryItem(name: $0, value: $1) }
    }
    return url!.url!
}

/// Send a HTTP request
func send<T>(_ api: API<T>,                             // API Node
             _ params: [String: String]? = [:],         // Parameters to send to the server
             _ success: @escaping (String) -> Void,     // What to do when success
             err: @escaping (String) -> Void = {it in}  // What to do when errors happen
)
{
    let url = createUrl(api.loc, params)
    
    let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
        guard let data = data, let body = String(data: data, encoding: .utf8) else { err("Data cannot be parsed"); return }
        
        success(body)
    }

    task.resume()
}