mchess-client/lib/chess/chess_board.dart

import 'dart:developer';

import 'package:flutter/material.dart';
import 'package:mchess/chess_bloc/chess_bloc.dart';

import 'chess_square.dart';
import '../utils/chess_utils.dart';

class ChessBoard extends StatelessWidget {
  final ChessBoardState bState;
  final List<ChessSquare> squares;

  const ChessBoard._({required this.bState, required this.squares});

  factory ChessBoard({required ChessBoardState boardState}) {
    List<ChessSquare> squares = List.empty(growable: true);
    for (int i = 0; i < 64; i++) {
      var column = (i % 8) + 1;
      var row = (i ~/ 8) + 1;

      final piece = boardState.position[ChessCoordinate(column, row)];

      bool squareWasPartOfLastMove = false;
      if (boardState.lastMove.to == ChessCoordinate(column, row) ||
          boardState.lastMove.from == ChessCoordinate(column, row)) {
        squareWasPartOfLastMove = true;
      }

      squares.add(
        ChessSquare(
          ChessCoordinate(column, row),
          piece,
          squareWasPartOfLastMove,
        ),
      );
    }

    return ChessBoard._(bState: boardState, squares: squares);
  }

  @override
  Widget build(BuildContext context) {
    log("ChessBoard's build()");

    return Container(
      decoration: const BoxDecoration(
          boxShadow: [BoxShadow(color: Colors.black, offset: Offset(10, 10))]),
      child: _buildBoard(bState.bottomColor == ChessColor.black),
    );
  }

  Row _buildChessRow(int rowNo, bool flipped) {
    if (!flipped) {
      return Row(
        children: [
          for (int i = 8 * rowNo - 8; i < 8 * rowNo; i++) squares.elementAt(i)
        ],
      );
    } else {
      return Row(
        children: [
          for (int i = 8 * rowNo - 1; i >= 8 * rowNo - 8; i--)
            squares.elementAt(i)
        ],
      );
    }
  }

  Column _buildBoard(bool flipped) {
    List<Row> chessBoard = <Row>[];

    if (!flipped) {
      for (int row = 8; row > 0; row--) {
        chessBoard.add(_buildChessRow(row, flipped));
      }
    } else {
      for (int row = 1; row <= 8; row++) {
        chessBoard.add(_buildChessRow(row, flipped));
      }
    }

    return Column(children: [...chessBoard]);
  }

  ChessSquare getSquareAtCoordinate(ChessCoordinate coord) {
    /* Calculate index in squares[] from column and row */
    int index = (coord.row - 1) * 8 + (coord.column - 1);

    log("getSquareAtCoordinates: index calculated to $index");

    return squares.elementAt(index);
  }
}