using Gameboard.ShogiUI.Sockets.ServiceModels.Socket.Types;
using PathFinding;
using System.Diagnostics;

namespace Gameboard.ShogiUI.Sockets.Models
{
  [DebuggerDisplay("{WhichPiece} {Owner}")]
  public class Piece : IPlanarElement
  {
    public WhichPiece WhichPiece { get; }
    public WhichPlayer Owner { get; private set; }
    public bool IsPromoted { get; private set; }
    public bool IsUpsideDown => Owner == WhichPlayer.Player2;

    public Piece(WhichPiece piece, WhichPlayer owner, bool isPromoted = false)
    {
      WhichPiece = piece;
      Owner = owner;
      IsPromoted = isPromoted;
    }

    public bool CanPromote => !IsPromoted
      && WhichPiece != WhichPiece.King
      && WhichPiece != WhichPiece.GoldGeneral;

    public void ToggleOwnership()
    {
      Owner = Owner == WhichPlayer.Player1
        ? WhichPlayer.Player2
        : WhichPlayer.Player1;
    }

    public void Promote() => IsPromoted = CanPromote;

    public void Demote() => IsPromoted = false;

    public void Capture()
    {
      ToggleOwnership();
      Demote();
    }

    // TODO: There is no reason to make "new" MoveSets every time this property is accessed.
    public MoveSet MoveSet => WhichPiece switch
    {
      WhichPiece.King => new MoveSet(this, MoveSets.King),
      WhichPiece.GoldGeneral => new MoveSet(this, MoveSets.GoldGeneral),
      WhichPiece.SilverGeneral => new MoveSet(this, IsPromoted ? MoveSets.GoldGeneral : MoveSets.SilverGeneral),
      WhichPiece.Bishop => new MoveSet(this, IsPromoted ? MoveSets.PromotedBishop : MoveSets.Bishop),
      WhichPiece.Rook => new MoveSet(this, IsPromoted ? MoveSets.PromotedRook : MoveSets.Rook),
      WhichPiece.Knight => new MoveSet(this, IsPromoted ? MoveSets.GoldGeneral : MoveSets.Knight),
      WhichPiece.Lance => new MoveSet(this, IsPromoted ? MoveSets.GoldGeneral : MoveSets.Lance),
      WhichPiece.Pawn => new MoveSet(this, IsPromoted ? MoveSets.GoldGeneral : MoveSets.Pawn),
      _ => throw new System.NotImplementedException()
    };

    public ServiceModels.Socket.Types.Piece ToServiceModel()
    {
      return new ServiceModels.Socket.Types.Piece
      {
        IsPromoted = IsPromoted,
        Owner = Owner,
        WhichPiece = WhichPiece
      };
    }
  }
}