// Chessboard.cs
using Godot;

public partial class ChessBoard : Node2D {
	VirtualBoard Board = null;
	MoveRecords Records = null;
	// Called when the node enters the scene tree for the first time.
	public Vector2 selectedNodePos = Vector2.Inf;
	public override void _Ready() {
		Board = new VirtualBoard(this as Node);
		Records = new MoveRecords(onUndoRecordCallback: (newNode, oldNode, newPos, oldPos) => {
			GD.Print("Undo: ", newNode, "->", oldNode, ":", newPos, "->", oldPos);
			ChessPiece newPiece = newNode as ChessPiece;
			ChessPiece oldPiece = oldNode as ChessPiece;
			Board.MoveNode(oldPos, newPos);
			if (newPiece != null) {
				Board.InsertNode(newPiece, newPos);
			}
			// if (oldPiece != null) {
			// 	Board.RemoveNode(oldPos);
			// }
		});
		Board.InitChessBoard();
		// this.AddChild();
	}

	public override void _Input(InputEvent @event) {
		if (@event is InputEventMouseButton mouseEvent &&
			mouseEvent.Pressed &&
			mouseEvent.ButtonIndex == MouseButton.Left) {
			// HandleMouseClick(GetGlobalTransformWithCanvas().AffineInverse() * mouseButton.Position);
			// HandleMouseClick(GetLocalMousePosition());
			ActionPos(
				(PosTrans.transArrToPix.AffineInverse() *
				GetLocalMousePosition()).Round()
			);
		}
	}

	public void ActionPos(Vector2 clickArrPos) {
		if (VirtualBoard.ArrPosOutOfRange(clickArrPos)) return;
		GD.Print($"{clickArrPos} mouse clicked");
		ChessPiece NowChess = Board.getNodeFromBoard(clickArrPos) as ChessPiece;
        ChessPiece SelChess = Board.getNodeFromBoard(selectedNodePos) as ChessPiece;

        if (Vector2.Inf.Equals(selectedNodePos)) {
			if (NowChess == null) {
				return;
			}
			NowChess.Selected();
            GD.Print($"{clickArrPos} is selected");
            selectedNodePos = clickArrPos;
        } else if (selectedNodePos == clickArrPos) {
			if (SelChess != null) {
				SelChess.DeSelected();
			}
            GD.Print($"{selectedNodePos} is deselected");
            selectedNodePos = Vector2.Inf;
        } else {
			GD.Print($"{selectedNodePos} move to {clickArrPos}");
			if (SelChess != null) {
				SelChess.DeSelected();
            	GD.Print($"{selectedNodePos} is deselected");
			}
			Node NowNode;
            if (NowChess != null) {
				GD.Print("nowchess", NowChess);
				NowNode = NowChess.Duplicate();
                Board.RemoveNode(clickArrPos);
            } else {
				NowNode = NowChess as Node;
			}
			Records.AddRecord(NowNode, SelChess, clickArrPos, selectedNodePos);
            Board.MoveNode(clickArrPos, selectedNodePos);
            selectedNodePos = Vector2.Inf;
			// GD.Print($"End: {selectedNodePos} {SelChess} move to {clickArrPos} {NowChess}");
        }
    }

	public void undo() {
		Records.Undo();
	}

	public void redo() {
		Records.Clear();
		Board.Clear();
		selectedNodePos = Vector2.Inf;
		Board.InitChessBoard();
	}

	private void HandleMouseClick(Vector2 clickPosition) {

		// 如果有棋子被选中，则进行后续操作
		// if (nowSelectedChess == null) {
		// 	seletedNode = null;
		// } else if (nowSelectedChess != null && seletedNode != null) {
		// 	if (seletedNode is ChessPiece chessPiece) MoveChess(arrayPos, chessPiece.arrPos);
		// }
	}

	
}