using SharedLibrary.Models;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace RepositoryLibrary
{
    public class HostedRepository : IRepository
    {
        private readonly string _backendUrl;
        public static ConcurrentBag<HttpClient> ApiClient = new ConcurrentBag<HttpClient>();
        public HostedRepository()
        {
            _backendUrl = "http://localhost:56143";
        }
        public async Task<object> Lookup()
        {
            return await GetAsync<string>();
        }

        private async Task<T> GetAsync<T>([CallerMemberName] string request = "")
        {
            string uri = GetUriString(request);
            var client = GetHttpClient();
            using (var response = await client.GetAsync(uri))
            {
                ReturnHttpClient(client);
                if (response.IsSuccessStatusCode)
                {
                    var model = await response.Content.ReadAsAsync<T>();
                    if (model != null)
                    {
                        return model;
                    }
                }
                var err = await response.Content.ReadAsAsync<RepositoryError>();
                if (err != null)
                {
                    throw new Exception(err.Information);
                }
                var str = await response.Content.ReadAsStringAsync();
                throw new Exception(str);

                
            }
        }
        private HttpClient GetHttpClient()
        {
            if (!ApiClient.TryTake(out HttpClient client))
            {
                client = new HttpClient();
            }
            return client;
        }
        private void ReturnHttpClient(HttpClient client)
        {
            ApiClient.Add(client);
        }
        private string GetUriString(string request)
        {
            return $"{_backendUrl}/api/{request}";
        }
    }
}