using Chess;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows;

namespace ChessPanel
{
    public class Pawn : Piece
    {
        public Pawn(PieceColor color, Vector position, Grid fields) : base(position, fields)
        {
            type = (PieceType)Enum.Parse(typeof(PieceType), this.GetType().Name);
            this.color = color;
            this.image = (Image)ChessPanel.Properties.Resources.ResourceManager.GetObject($"{this.type.ToString()}{this.color.ToString()}");
        }

        internal override bool EndageresFieldWithVirtualMove(Grid fields, Field field, Piece movePiece, Field targetPos) // Pawn does not care about virtually moved pieces, if field is in range it can attack
        {
            int direction = this.color == PieceColor.White ? -1 : 1;
            #region Attack
            for (int x = -1; x < 2; x += 2)
            {
                if (field.location.Y + (direction) > 7 || field.location.Y + (direction) < 0 || field.location.X + x > 7 || field.location.X + x < 0)
                    continue;
                if (fields[field.location, x, direction] == field)
                    return true;
            }
            #endregion
            return false;
        }

        internal override Dictionary<Field, PieceTeam> GetTargetFields(Grid fields, Field field, PieceColor color)
        {
            MoveMode mode = MoveMode.Normal;

            Dictionary<Field, PieceTeam> targetFields = new Dictionary<Field, PieceTeam>();
            int direction = this.color == PieceColor.White ? -1 : 1;
            #region Movement    
            if (mode == MoveMode.Normal || mode == MoveMode.Movement)
                for (int y = 1; y < 1 + (HasMoved ? 1 : 2); y++)
                {
                    if (field.location.Y + (direction * y) > 7 || field.location.Y + (direction * y) < 0)
                        break;
                    if (fields[field.location, 0, (direction * y)].IsEmpty)
                        targetFields.Add(fields[field.location, 0, (direction * y)], PieceTeam.Ally);
                    else
                        break;
                }
            #endregion
            #region Attack
            if (mode == MoveMode.Normal || mode == MoveMode.Attack)
            {
                #region EnPassant
                if (field.location.Y == (this.color == PieceColor.White ? 3 : 4))
                    for (int x = -1; x < 2; x += 2)
                        if (field.location.X + x <= 7 && field.location.X + x >= 0)
                            if (fields[field.location, x, 0].CurrentPiece != null
                                && fields[field.location, x, 0].CurrentPiece.type == PieceType.Pawn
                                && fields[field.location, x, 0].CurrentPiece.color != this.color
                                && fields[field.location, x, 0].CurrentPiece.EnPassantPossible)
                                targetFields.Add(fields[field.location, x, direction], PieceTeam.Enemy);
                #endregion
                for (int x = -1; x < 2; x += 2)
                {
                    if (field.location.Y + (direction) > 7 || field.location.Y + (direction) < 0 || field.location.X + x > 7 || field.location.X + x < 0)
                        continue;
                    if (fields[field.location, x, direction].CurrentPiece != null && fields[field.location, x, direction].CurrentPiece.color != this.color)
                    {
                        targetFields.Add(fields[field.location, x, direction], PieceTeam.Enemy);
                    }
                }
                #endregion
            }
            return targetFields;
        }

    }

}