using Gameboard.ShogiUI.Sockets.Repositories.CouchModels;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace Gameboard.ShogiUI.Sockets.Repositories
{
  public interface IGameboardRepository
  {
    Task<bool> CreateBoardState(Models.Session session);
    Task<bool> CreateSession(Models.SessionMetadata session);
    Task<bool> CreateUser(Models.User user);
    Task<IList<Models.SessionMetadata>> ReadSessionMetadatas();
    Task<Models.User?> ReadGuestUser(Guid webSessionId);
    Task<Models.Session?> ReadSession(string name);
    Task<Models.Shogi?> ReadShogi(string name);
    Task<bool> UpdateSession(Models.SessionMetadata session);
    Task<Models.SessionMetadata?> ReadSessionMetaData(string name);
    Task<Models.User?> ReadUser(string userName);
  }

  public class GameboardRepository : IGameboardRepository
  {
    private const string ApplicationJson = "application/json";
    private readonly HttpClient client;
    private readonly ILogger<GameboardRepository> logger;

    public GameboardRepository(IHttpClientFactory clientFactory, ILogger<GameboardRepository> logger)
    {
      client = clientFactory.CreateClient("couchdb");
      this.logger = logger;
    }

    public async Task<IList<Models.SessionMetadata>> ReadSessionMetadatas()
    {
      var selector = new Dictionary<string, object>(2)
      {
        [nameof(SessionDocument.DocumentType)] = WhichDocumentType.Session
      };
      var q = new { Selector = selector };
      var content = new StringContent(JsonConvert.SerializeObject(q), Encoding.UTF8, ApplicationJson);
      var response = await client.PostAsync("_find", content);
      var responseContent = await response.Content.ReadAsStringAsync();
      var results = JsonConvert.DeserializeObject<CouchFindResult<SessionDocument>>(responseContent);
      if (results != null)
      {
        return results
          .docs
          .Select(s => new Models.SessionMetadata(s.Name, s.IsPrivate, s.Player1, s.Player2))
          .ToList();
      }

      return new List<Models.SessionMetadata>(0);
    }

    public async Task<Models.Session?> ReadSession(string name)
    {
      var readShogiTask = ReadShogi(name);
      var response = await client.GetAsync(name);
      var responseContent = await response.Content.ReadAsStringAsync();
      var couchModel = JsonConvert.DeserializeObject<SessionDocument>(responseContent);
      var shogi = await readShogiTask;
      if (shogi == null)
      {
        return null;
      }
      return couchModel.ToDomainModel(shogi);
    }

    public async Task<Models.SessionMetadata?> ReadSessionMetaData(string name)
    {
      var response = await client.GetAsync(name);
      var responseContent = await response.Content.ReadAsStringAsync();
      var couchModel = JsonConvert.DeserializeObject<SessionDocument>(responseContent);
      return couchModel.ToDomainModel();
    }

    public async Task<Models.Shogi?> ReadShogi(string name)
    {
      var selector = new Dictionary<string, object>(2)
      {
        [nameof(BoardStateDocument.DocumentType)] = WhichDocumentType.BoardState,
        [nameof(BoardStateDocument.Name)] = name
      };
      var sort = new Dictionary<string, object>(1)
      {
        [nameof(BoardStateDocument.CreatedDate)] = "asc"
      };
      var query = JsonConvert.SerializeObject(new { selector, sort = new[] { sort } });

      var content = new StringContent(query, Encoding.UTF8, ApplicationJson);
      var response = await client.PostAsync("_find", content);
      var responseContent = await response.Content.ReadAsStringAsync();
      if (!response.IsSuccessStatusCode)
      {
        logger.LogError("Couch error during _find in {func}: {error}.\n\nQuery: {query}", nameof(ReadShogi), responseContent, query);
        return null;
      }
      var boardStates = JsonConvert
        .DeserializeObject<CouchFindResult<BoardStateDocument>>(responseContent)
        .docs;
      if (boardStates.Length == 0) return null;

      // Skip(1) because the first BoardState has no move; it represents the initial board state of a new Session.
      var moves = boardStates.Skip(1).Select(couchModel =>
      {
        var move = couchModel.Move;
        Models.Move model = move!.PieceFromHand.HasValue
        ? new Models.Move(move.PieceFromHand.Value, move.To)
        : new Models.Move(move.From!, move.To, move.IsPromotion);
        return model;
      }).ToList();
      return new Models.Shogi(moves);
    }

    /// <summary>
    /// Saves a snapshot of board state and the most recent move.
    /// </summary>
    public async Task<bool> CreateBoardState(Models.Session session)
    {
      var boardStateDocument = new BoardStateDocument(session.Name, session.Shogi);
      var content = new StringContent(JsonConvert.SerializeObject(boardStateDocument), Encoding.UTF8, ApplicationJson);
      var response = await client.PostAsync(string.Empty, content);
      return response.IsSuccessStatusCode;
    }

    public async Task<bool> CreateSession(Models.SessionMetadata session)
    {
      var sessionDocument = new SessionDocument(session);
      var sessionContent = new StringContent(JsonConvert.SerializeObject(sessionDocument), Encoding.UTF8, ApplicationJson);
      var postSessionDocumentTask = client.PostAsync(string.Empty, sessionContent);

      var boardStateDocument = new BoardStateDocument(session.Name, new Models.Shogi());
      var boardStateContent = new StringContent(JsonConvert.SerializeObject(boardStateDocument), Encoding.UTF8, ApplicationJson);

      if ((await postSessionDocumentTask).IsSuccessStatusCode)
      {
        var response = await client.PostAsync(string.Empty, boardStateContent);
        return response.IsSuccessStatusCode;
      }
      return false;
    }

    public async Task<bool> UpdateSession(Models.SessionMetadata session)
    {
      var couchModel = new SessionDocument(session);
      var content = new StringContent(JsonConvert.SerializeObject(couchModel), Encoding.UTF8, ApplicationJson);
      var response = await client.PutAsync(couchModel.Id, content);
      return response.IsSuccessStatusCode;
    }
    //public async Task<bool> PutJoinPublicSession(PutJoinPublicSession request)
    //{
    //  var content = new StringContent(JsonConvert.SerializeObject(request), Encoding.UTF8, MediaType);
    //  var response = await client.PutAsync(JoinSessionRoute, content);
    //  var json = await response.Content.ReadAsStringAsync();
    //  return JsonConvert.DeserializeObject<PutJoinPublicSessionResponse>(json).JoinSucceeded;
    //}

    //public async Task<string> PostJoinPrivateSession(PostJoinPrivateSession request)
    //{
    //  var content = new StringContent(JsonConvert.SerializeObject(request), Encoding.UTF8, MediaType);
    //  var response = await client.PostAsync(JoinSessionRoute, content);
    //  var json = await response.Content.ReadAsStringAsync();
    //  var deserialized = JsonConvert.DeserializeObject<PostJoinPrivateSessionResponse>(json);
    //  if (deserialized.JoinSucceeded)
    //  {
    //    return deserialized.SessionName;
    //  }
    //  return null;
    //}

    //public async Task<List<Move>> GetMoves(string gameName)
    //{
    //  var uri = $"Session/{gameName}/Moves";
    //  var get = await client.GetAsync(Uri.EscapeUriString(uri));
    //  var json = await get.Content.ReadAsStringAsync();
    //  if (string.IsNullOrWhiteSpace(json))
    //  {
    //    return new List<Move>();
    //  }
    //  var response = JsonConvert.DeserializeObject<GetMovesResponse>(json);
    //  return response.Moves.Select(m => new Move(m)).ToList();
    //}

    //public async Task PostMove(string gameName, PostMove request)
    //{
    //  var uri = $"Session/{gameName}/Move";
    //  var content = new StringContent(JsonConvert.SerializeObject(request), Encoding.UTF8, MediaType);
    //  await client.PostAsync(Uri.EscapeUriString(uri), content);
    //}

    public async Task<string> PostJoinCode(string gameName, string userName)
    {
      //  var uri = $"JoinCode/{gameName}";
      //  var serialized = JsonConvert.SerializeObject(new PostJoinCode { PlayerName = userName });
      //  var content = new StringContent(serialized, Encoding.UTF8, MediaType);
      //  var json = await (await client.PostAsync(Uri.EscapeUriString(uri), content)).Content.ReadAsStringAsync();
      //  return JsonConvert.DeserializeObject<PostJoinCodeResponse>(json).JoinCode;
      return string.Empty;
    }

    public async Task<Models.User?> ReadUser(string userName)
    {
      try
      {
        var document = new UserDocument(userName);
        var uri = new Uri(client.BaseAddress!, HttpUtility.UrlEncode(document.Id));
        var response = await client.GetAsync(HttpUtility.UrlEncode(document.Id));
        var response2 = await client.GetAsync(uri);
        var responseContent = await response.Content.ReadAsStringAsync();
        if (response.IsSuccessStatusCode)
        {
          var user = JsonConvert.DeserializeObject<UserDocument>(responseContent);

          return new Models.User(user.Name);
        }
      }
      catch (Exception e)
      {
        Console.WriteLine(e);
      }
      return null;
    }

    public async Task<bool> CreateUser(Models.User user)
    {
      var couchModel = new UserDocument(user.Name, user.WebSessionId);
      var content = new StringContent(JsonConvert.SerializeObject(couchModel), Encoding.UTF8, ApplicationJson);
      var response = await client.PostAsync(string.Empty, content);
      return response.IsSuccessStatusCode;
    }

    public async Task<Models.User?> ReadGuestUser(Guid webSessionId)
    {
      var selector = new Dictionary<string, object>(2)
      {
        [nameof(UserDocument.DocumentType)] = WhichDocumentType.User,
        [nameof(UserDocument.WebSessionId)] = webSessionId.ToString()
      };
      var query = JsonConvert.SerializeObject(new { selector, limit = 1 });
      var content = new StringContent(query, Encoding.UTF8, ApplicationJson);
      var response = await client.PostAsync("_find", content);
      var responseContent = await response.Content.ReadAsStringAsync();
      if (!response.IsSuccessStatusCode)
      {
        logger.LogError("Couch error during _find in {func}: {error}.\n\nQuery: {query}", nameof(ReadGuestUser), responseContent, query);
        return null;
      }

      var result = JsonConvert.DeserializeObject<CouchFindResult<UserDocument>>(responseContent);
      if (!string.IsNullOrWhiteSpace(result.warning))
      {
        logger.LogError(new InvalidOperationException(result.warning), result.warning);
        return null;
      }
      var userDocument = result.docs.SingleOrDefault();
      if (userDocument != null)
      {
        return new Models.User(userDocument.Name);
      }
      return null;
    }
  }
}