Shogi/Gameboard.ShogiUI.Sockets/Repositories/CouchModels/BoardStateDocument.cs

using Gameboard.ShogiUI.Sockets.ServiceModels.Types;
using Gameboard.ShogiUI.Sockets.Utilities;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;

namespace Gameboard.ShogiUI.Sockets.Repositories.CouchModels
{
  public class BoardStateDocument : CouchDocument
  {
    public string Name { get; set; }

    /// <summary>
    /// A dictionary where the key is a board-notation position, like D3.
    /// </summary>
    public Dictionary<string, Piece?> Board { get; set; }

    public Piece[] Player1Hand { get; set; }

    public Piece[] Player2Hand { get; set; }

    /// <summary>
    /// Move is null for first BoardState of a session - before anybody has made moves.
    /// </summary>
    public Move? Move { get; set; }

    /// <summary>
    /// Default constructor and setters are for deserialization.
    /// </summary>
    public BoardStateDocument() : base(WhichDocumentType.BoardState)
    {
      Name = string.Empty;
      Board = new Dictionary<string, Piece?>(81, StringComparer.OrdinalIgnoreCase);
      Player1Hand = Array.Empty<Piece>();
      Player2Hand = Array.Empty<Piece>();
    }

    public BoardStateDocument(string sessionName, Models.Shogi shogi)
      : base($"{sessionName}-{DateTime.Now:O}", WhichDocumentType.BoardState)
    {
      Name = sessionName;
      Board = new Dictionary<string, Piece?>(81, StringComparer.OrdinalIgnoreCase);

      for (var x = 0; x < 9; x++)
        for (var y = 0; y < 9; y++)
        {
          var position = new Vector2(x, y);
          var piece = shogi.Board[y, x];

          if (piece != null)
          {
            var positionNotation = NotationHelper.ToBoardNotation(position);
            Board[positionNotation] = new Piece(piece);
          }
        }

      Player1Hand = shogi.Player1Hand.Select(model => new Piece(model)).ToArray();
      Player2Hand = shogi.Player2Hand.Select(model => new Piece(model)).ToArray();
      if (shogi.MoveHistory.Count > 0)
      {
        Move = new Move(shogi.MoveHistory[^1]);
      }
    }
  }
}