// 🧩 대시보드 타일의 격자 위치/크기(1x1 ~ 4x4)를 표현하는 값 객체.
// 전체 배치 캔버스는 가로 6칸 × 세로 4칸으로 고정한다.
const int kGridCols = 6;
const int kGridRows = 4;
const int kMinTileSize = 1;
const int kMaxTileSize = 4;

class TileRect {
  final int x;
  final int y;
  final int w;
  final int h;

  const TileRect({
    required this.x,
    required this.y,
    required this.w,
    required this.h,
  });

  factory TileRect.fromJson(Map<String, dynamic> json) => TileRect(
    x: (json['x'] as num).toInt(),
    y: (json['y'] as num).toInt(),
    w: (json['w'] as num).toInt(),
    h: (json['h'] as num).toInt(),
  );

  Map<String, dynamic> toJson(String id) => {
    'id': id,
    'x': x,
    'y': y,
    'w': w,
    'h': h,
  };

  TileRect copyWith({int? x, int? y, int? w, int? h}) =>
      TileRect(x: x ?? this.x, y: y ?? this.y, w: w ?? this.w, h: h ?? this.h);

  bool overlaps(TileRect other) {
    return x < other.x + other.w &&
        x + w > other.x &&
        y < other.y + other.h &&
        y + h > other.y;
  }

  bool get isWithinCanvas =>
      x >= 0 &&
      y >= 0 &&
      x + w <= kGridCols &&
      y + h <= kGridRows &&
      w >= kMinTileSize &&
      h >= kMinTileSize &&
      w <= kMaxTileSize &&
      h <= kMaxTileSize;
}