using Gameboard.ShogiUI.Rules;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using ServiceTypes = Gameboard.ShogiUI.Sockets.ServiceModels.Socket.Types;

namespace Gameboard.ShogiUI.Sockets.Models
{
  public class BoardState
  {
    // TODO: Create a custom 2D array implementation which removes the (x,y) or (y,x) ambiguity.
    public Piece?[,] Board { get; }
    public IReadOnlyCollection<Piece> Player1Hand { get; }
    public IReadOnlyCollection<Piece> Player2Hand { get; }
    /// <summary>
    /// Move is null in the first BoardState of a Session, before any moves have been made.
    /// </summary>
    public Move? Move { get; }

    public BoardState() : this(new ShogiBoard()) { }

    public BoardState(Piece?[,] board, IList<Piece> player1Hand, ICollection<Piece> player2Hand, Move move)
    {
      Board = board;
      Player1Hand = new ReadOnlyCollection<Piece>(player1Hand);
    }

    public BoardState(ShogiBoard shogi)
    {
      Board = new Piece[9, 9];
      for (var x = 0; x < 9; x++)
        for (var y = 0; y < 9; y++)
        {
          var piece = shogi.Board[x, y];
          if (piece != null)
          {
            Board[x, y] = new Piece(piece);
          }
        }

      Player1Hand = shogi.Hands[WhichPlayer.Player1].Select(_ => new Piece(_)).ToList();
      Player2Hand = shogi.Hands[WhichPlayer.Player2].Select(_ => new Piece(_)).ToList();
      Move = new Move(shogi.MoveHistory[^1]);
    }

    public ServiceTypes.BoardState ToServiceModel()
    {
      var board = new ServiceTypes.Piece[9, 9];
      for (var x = 0; x < 9; x++)
        for (var y = 0; y < 9; y++)
        {
          var piece = Board[x, y];
          if (piece != null)
          {
            board[x, y] = piece.ToServiceModel();
          }
        }
      return new ServiceTypes.BoardState
      {
        Board = board,
        Player1Hand = Player1Hand.Select(_ => _.ToServiceModel()).ToList(),
        Player2Hand = Player2Hand.Select(_ => _.ToServiceModel()).ToList()
      };
    }
  }
}