import "package:flutter_test/flutter_test.dart";
import "package:garage_ui/theme/theme_data.dart";

// The whole point of the ladder: text that isn't in a control has to stay in
// step with the control font. If someone retunes fontSize and textXs stops
// tracking it, a dialog title drifts away from the button under it again.
void main() {
  for (final d in const [Density(), Density.normal()]) {
    final name = d.control.name;

    test("$name: textXs sits a step above the control font", () {
      expect(d.textXs, greaterThan(d.fontSize),
          reason: "dialog copy is meant to read larger than a button label");
    });

    test("$name: the ladder climbs and stays on whole pixels", () {
      final steps = [d.textXs, d.textSm, d.textLg];
      for (var i = 1; i < steps.length; i++) {
        expect(steps[i], greaterThan(steps[i - 1]));
      }
      for (final s in steps) {
        expect(s, s.roundToDouble(), reason: "$s is not a whole pixel");
      }
    });
  }

  test("the two larger tiers keep the values they replaced", () {
    // these were hardcoded 12/14/18 - a retune of fontSize is meant to move
    // them, but at the shipped densities they must not shift at all.
    for (final d in const [Density(), Density.normal()]) {
      expect(d.textXs, 11.0);
      expect(d.textSm, 14.0);
      expect(d.textLg, 18.0);
    }
  });

  test("a retuned density carries the whole ladder with it", () {
    const big = Density(fontSize: 20);
    expect(big.textXs, 22.0);
    expect(big.textSm, 28.0);
    expect(big.textLg, 36.0);
  });
}