Shogi/Gameboard.ShogiUI.Sockets/Repositories/RepositoryManagers/GameboardRepositoryManager.cs

using Gameboard.Shogi.Api.ServiceModels.Messages;
using System;
using System.Threading.Tasks;

namespace Gameboard.ShogiUI.Sockets.Repositories.RepositoryManagers
{
  public interface IGameboardRepositoryManager
  {
    Task<string> CreateGuestUser();
    Task<bool> IsPlayer1(string sessionName, string playerName);
    bool IsGuest(string playerName);
    Task<bool> PlayerExists(string playerName);
  }

  public class GameboardRepositoryManager : IGameboardRepositoryManager
  {
    private const int MaxTries = 3;
    private const string GuestPrefix = "Guest-";
    private readonly IGameboardRepository repository;

    public GameboardRepositoryManager(IGameboardRepository repository)
    {
      this.repository = repository;
    }

    public async Task<string> CreateGuestUser()
    {
      var count = 0;
      while (count < MaxTries)
      {
        count++;
        var clientId = $"Guest-{Guid.NewGuid()}";
        var request = new PostPlayer
        {
          PlayerName = clientId
        };
        var isCreated = await repository.PostPlayer(request);
        if (isCreated)
        {
          return clientId;
        }
      }
      throw new OperationCanceledException($"Failed to create guest user after {MaxTries} tries.");
    }

    public async Task<bool> IsPlayer1(string sessionName, string playerName)
    {
      var session = await repository.GetGame(sessionName);
      return session?.Player1 == playerName;
    }

    public async Task<string> CreateJoinCode(string sessionName, string playerName)
    {
      var session = await repository.GetGame(sessionName);
      if (playerName == session?.Player1)
      {
        return await repository.PostJoinCode(sessionName, playerName);
      }
      return null;
    }

    public bool IsGuest(string playerName) => playerName.StartsWith(GuestPrefix);

    public async Task<bool> PlayerExists(string playerName) => await repository.GetPlayer(playerName) != null;
  }
}