import 'package:flutter/material.dart';
import 'package:mchess/chess/chess_square_inner_draggable.dart';
import 'package:mchess/chess_bloc/chess_bloc.dart';
import 'package:mchess/chess_bloc/chess_events.dart';
import 'package:mchess/chess_bloc/promotion_bloc.dart';
import 'package:mchess/utils/chess_utils.dart';

class ChessSquareOuterDragTarget extends StatelessWidget {
  final ChessCoordinate coordinate;
  final ChessPiece containedPiece;

  const ChessSquareOuterDragTarget(
      {super.key,
      required this.coordinate,
      required this.containedPiece});

  @override
  Widget build(BuildContext context) {
    return DragTarget<PieceDragged>(
      onWillAccept: (move) {
        if (move?.fromSquare == coordinate) {
          return false;
        }
        return true;
      },
      onAccept: (pieceDragged) {
        // Replace the dummy value with the actual target of the move.
        pieceDragged.toSquare = coordinate;

        if (isPromotionMove(pieceDragged)) {
          var move = ChessMove(
              from: pieceDragged.fromSquare, to: pieceDragged.toSquare);
          PromotionBloc.getInstance().add(PawnMovedToPromotionField(
              move: move, colorMoved: ChessBloc.myColor!));
        } else if (coordinate != pieceDragged.fromSquare) {
          ChessBloc.getInstance().add(OwnPieceMoved(
              startSquare: pieceDragged.fromSquare,
              endSquare: pieceDragged.toSquare,
              piece: pieceDragged.movedPiece!));
        }
      },
      builder: (context, candidateData, rejectedData) {
        return ChessSquareInnerDraggable(
          coordinate: coordinate,
          containedPiece: containedPiece,
        );
      },
    );
  }

  bool isPromotionMove(PieceDragged move) {
    bool isPromotion = false;
    if (move.movedPiece!.pieceClass != ChessPieceClass.pawn) {
      return isPromotion;
    }

    switch (ChessBloc.myColor) {
      case ChessColor.black:
        if (move.toSquare.row == 1) {
          isPromotion = true;
        }
        break;
      case ChessColor.white:
        if (move.toSquare.row == 8) {
          isPromotion = true;
        }
        break;
      case null:
        break;
    }

    return isPromotion;
  }
}