import 'package:block_seasons/ui/widgets/map_layout.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  const layout = MapLayout(width: 400);

  test('node 0 sits near the bottom, later nodes climb', () {
    final h = layout.heightFor(60);
    final first = layout.nodeCenter(0, 60);
    final last = layout.nodeCenter(59, 60);
    expect(first.dy, greaterThan(h - 200));
    expect(last.dy, lessThan(200));
    for (var i = 1; i < 60; i++) {
      expect(layout.nodeCenter(i, 60).dy,
          lessThan(layout.nodeCenter(i - 1, 60).dy));
    }
  });

  test('x stays within horizontal margins', () {
    for (var i = 0; i < 60; i++) {
      final x = layout.nodeCenter(i, 60).dx;
      expect(x, greaterThanOrEqualTo(400 * 0.12));
      expect(x, lessThanOrEqualTo(400 * 0.88));
    }
  });

  test('vertical spacing is uniform', () {
    final a = layout.nodeCenter(3, 60).dy - layout.nodeCenter(4, 60).dy;
    final b = layout.nodeCenter(40, 60).dy - layout.nodeCenter(41, 60).dy;
    expect(a, closeTo(b, 0.001));
  });
}