using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using ChaosBot.Lodestone;
using Newtonsoft.Json;
using NLog;
using NLog.Fluent;

namespace ChaosBot.Services
{
    public static class LodestoneHttpProxy
    {
        public static T Fetch<T>(string endpoint)
        {
            // TODO: implement some sort of local caching
            return Fetch<T>(endpoint, new Dictionary<string, string>());
        }
        
        public static T Fetch<T>(string endpoint, Dictionary<string, string> parameters)
        {
            // TODO: implement some sort of local caching
            return LodestoneHttpConnection.Fetch<T>(endpoint, parameters).GetAwaiter().GetResult();
        }
    }

    static class LodestoneHttpConnection
    {
        private static readonly ILogger _logger = Program.Logger;
        static HttpClient client = new HttpClient();
        private static bool _firstRun = true;

        public static async Task<T> Fetch<T>(string endpoint, Dictionary<string, string> parameters)
        {
            try
            {
                if (_firstRun)
                {
                    _firstRun = false;
                    client.BaseAddress = new Uri("https://xivapi.com/");
                    client.DefaultRequestHeaders.Accept.Clear();
                    client.DefaultRequestHeaders.Accept.Add(
                        new MediaTypeWithQualityHeaderValue("application/json"));
                }

                string queryString = String.Join("&",parameters.Select(param => $"{param.Key}={param.Value}").ToArray());
                HttpResponseMessage response = await client.GetAsync($"{endpoint}?{queryString}");
                string output = null;
                if (response.IsSuccessStatusCode)
                {
                    output = await response.Content.ReadAsStringAsync();
                    return JsonConvert.DeserializeObject<T>(output);
                }

                throw new HttpRequestException($"HTTP Response for '{response.RequestMessage.RequestUri}' returned status code {response.StatusCode}");
            }
            catch (Exception ex)
            {
                _logger.Error(ex, $"HttpProxy.fetch<{typeof(T)}>: Exception [{ex}] thrown, <[{ex.Message}]>.");
                throw;
            }
        }
    }
}