using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Runtime.CompilerServices;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;

namespace EPAServeur.BDAccess
{
    public class APIAccess
    {
        private static APIAccess instance = null;
        private string serveur = "http://localhost:3000";

        private APIAccess()
        {
            
        }

        public static APIAccess getInstance()
        {
            return instance;
        }

        public static List<T> requestGetAPI<T>(string query)
        {
            if (instance == null)
            {
                instance = new APIAccess();
            }

            List<T> result = new List<T>();
            WebClient client = new WebClient();
            result = JsonSerializer.Deserialize<List<T>>(client.DownloadString(instance.serveur+query));

            return result;
        }
        public static List<T> requestPostAPI<T>(string query, List<KeyValuePair<string, string>> postParam = null)
        {
            if (instance == null)
            {
                instance = new APIAccess();
            }

            List<T> result = new List<T>();
            WebClient client = new WebClient();
            client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
            if (postParam != null)
            {
                foreach (KeyValuePair<string, string> arg in postParam)
                {
                    client.QueryString.Add(arg.Key, arg.Value);
                }
            }
            
            try
            {
                var data = client.UploadValues(query, "POST", client.QueryString);
                result = JsonSerializer.Deserialize<List<T>>(UnicodeEncoding.UTF8.GetString(data));
            }
            catch
            {
                result = null;
            }
            return result;
        }
        
    }
}