using System;
using System.Collections.Generic;
using System.Linq;
using NLog;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using NzbDrone.Common;
using NzbDrone.Core.Model.Xem;

namespace NzbDrone.Core.Providers
{
    public interface IXemCommunicationProvider
    {
        List<Int32> GetXemSeriesIds(string origin = "tvdb");
        List<XemSceneTvdbMapping> GetSceneTvdbMappings(int id);
        void CheckForFailureResult(string response);
    }

    public class XemCommunicationProvider : IXemCommunicationProvider
    {
        private readonly IHttpProvider _httpProvider;

        private static readonly Logger _logger = LogManager.GetCurrentClassLogger();

        private const string XEM_BASE_URL = "http://thexem.de/map/";

        public XemCommunicationProvider(IHttpProvider httpProvider)
        {
            _httpProvider = httpProvider;
        }

        public List<Int32> GetXemSeriesIds(string origin = "tvdb")
        {
            _logger.Trace("Fetching Series IDs from: {0}", origin);

            var url = String.Format("{0}havemap?origin={1}", XEM_BASE_URL, origin);
            var response =_httpProvider.DownloadString(url);

            CheckForFailureResult(response);

            var result = JsonConvert.DeserializeObject<XemResult<List<Int32>>>(response);

            return result.Data.ToList();
        }

        public List<XemSceneTvdbMapping> GetSceneTvdbMappings(int id)
        {
            _logger.Trace("Fetching Mappings for: {0}", id);
            var url = String.Format("{0}all?id={1}&origin=tvdb", XEM_BASE_URL, id);
            var response = _httpProvider.DownloadString(url);

            CheckForFailureResult(response);

            var result = JsonConvert.DeserializeObject<List<XemSceneTvdbMapping>>(JObject.Parse(response).SelectToken("data").ToString());

            return result;
        }

        public void CheckForFailureResult(string response)
        {
            var result = JsonConvert.DeserializeObject<XemResult<dynamic>>(response);

            if (result != null && result.Result.Equals("failure", StringComparison.InvariantCultureIgnoreCase))
                throw new Exception("Error response received from Xem: " + result.Message);
        }
    }
}
