using System;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using Newtonsoft.Json;
using BlizzSharp.Data;
using System.Collections.Generic;

namespace BlizzSharp
{
    public class BlizzSharpClient
    {
        private readonly Dictionary<long, Item> _itemLookup;
        private string _key;
        private HttpClient _http;
        private JsonSerializer _serializer;
        private long _latestTimeStamp;
        public AuctionResponse CurrentAuctionResponse {get;set;}
        public AuctionResponse PreviousAuctionResponse {get;set;}

        public BlizzSharpClient(string key)
        {
            _itemLookup = new Dictionary<long, Item>();
            _serializer = new JsonSerializer();
            _http = new HttpClient();
            _http.BaseAddress = new Uri("https://eu.api.battle.net/wow/");
            _http.DefaultRequestHeaders.Accept.Clear();
            _http.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            _key = key;
            _latestTimeStamp = -1;
        }

        //TODO: Exception handling
        public async Task<AuctionResponse> GetAuctionsAsync(string realm, string locale)
        {
            HttpResponseMessage response = await _http.GetAsync($"auction/data/{realm}?locale={locale}&apikey={_key}");
            if(response.IsSuccessStatusCode)
            {
                string auctionsLocatorResponse = await response.Content.ReadAsStringAsync();
                AuctionLocator locator = JsonConvert.DeserializeObject<Data.AuctionLocatorList>(auctionsLocatorResponse).Locators[0];
                if((locator.Timestamp > _latestTimeStamp) || CurrentAuctionResponse == null)
                {
                    using(HttpClient auctionClient = new HttpClient())
                    {
                        HttpResponseMessage auctionResponse = await auctionClient.GetAsync(locator.Url);
                        if(auctionResponse.IsSuccessStatusCode)
                        {
                            string auctionsResponse = await auctionResponse.Content.ReadAsStringAsync();
                            PreviousAuctionResponse = CurrentAuctionResponse;
                            CurrentAuctionResponse = JsonConvert.DeserializeObject<AuctionResponse>(auctionsResponse);
                            return CurrentAuctionResponse;
                        }
                    }

                }
            }
                
            return null;
        }

        public async Task<Item> GetItemInfoAsync(long itemId, string locale)
        {
            if(_itemLookup.ContainsKey(itemId))
                return _itemLookup[itemId];
            HttpResponseMessage response = await _http.GetAsync($"item/{itemId}?locale={locale}&apikey={_key}");
            if(response.IsSuccessStatusCode)
            {
                string itemResponse = await response.Content.ReadAsStringAsync();
                Item item = JsonConvert.DeserializeObject<Item>(itemResponse);
                _itemLookup[itemId] = item;
                return item;
            }
            return null;
        }
    }
}