using Gameboard.ShogiUI.Rules;
using Gameboard.ShogiUI.Sockets.Repositories;
using Gameboard.ShogiUI.Sockets.ServiceModels.Socket.Messages;
using Gameboard.ShogiUI.Sockets.ServiceModels.Socket.Types;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System.Linq;
using System.Threading.Tasks;

namespace Gameboard.ShogiUI.Sockets.Managers.ClientActionHandlers
{
  /// <summary>
  /// Subscribes a user to messages for a session and loads that session into the BoardManager for playing.
  /// </summary>
  public class LoadGameHandler : IActionHandler
  {
    private readonly ILogger<LoadGameHandler> logger;
    private readonly IGameboardRepository gameboardRepository;
    private readonly ISocketCommunicationManager communicationManager;
    private readonly IBoardManager boardManager;

    public LoadGameHandler(
      ILogger<LoadGameHandler> logger,
      ISocketCommunicationManager communicationManager,
      IGameboardRepository gameboardRepository,
      IBoardManager boardManager)
    {
      this.logger = logger;
      this.gameboardRepository = gameboardRepository;
      this.communicationManager = communicationManager;
      this.boardManager = boardManager;
    }

    public async Task Handle(string json, string userName)
    {
      var request = JsonConvert.DeserializeObject<LoadGameRequest>(json);
      var gameTask = gameboardRepository.GetGame(request.GameName);
      var moveTask = gameboardRepository.GetMoves(request.GameName);

      var sessionModel = await gameTask;
      if (sessionModel == null)
      {
        logger.LogWarning("{action} - {user} was unable to load session named {session}.", ClientAction.LoadGame, userName, request.GameName);
        var response = new LoadGameResponse(ClientAction.LoadGame) { Error = "Game not found." };
        await communicationManager.BroadcastToPlayers(response, userName);
      }
      else
      {
        var moveModels = await moveTask;

        communicationManager.SubscribeToGame(sessionModel, userName);
        var boardMoves = moveModels.Select(_ => _.ToBoardModel()).ToList();
        var shogiBoard = new ShogiBoard(boardMoves);
        boardManager.Add(sessionModel.Name, shogiBoard);

        var response = new LoadGameResponse(ClientAction.LoadGame)
        {
          Game = sessionModel.ToServiceModel(),
          BoardState = new Models.BoardState(shogiBoard).ToServiceModel()
        };
        await communicationManager.BroadcastToPlayers(response, userName);
      }
    }
  }
}