import "package:flutter/widgets.dart";
import "package:flutter_test/flutter_test.dart";
import "package:garage_ui/garage_ui.dart";

import "support/test_scheme.dart";

Widget _host(Density density, Widget child) => Directionality(
  textDirection: TextDirection.ltr,
  child: GarageTheme(
    data: ThemeData(colorScheme: testScheme, density: density),
    child: Column(children: [child]),
  ),
);

void main() {
  for (final density in const [Density(), Density.normal()]) {
    testWidgets("${density.control.name}: Gap.md takes its extent from the theme",
        (tester) async {
      await tester.pumpWidget(_host(density, const Gap.md()));
      expect(tester.getSize(find.byType(Gap)).height, density.gapMd);
    });
  }

  testWidgets("a literal Gap still wins over the scale", (tester) async {
    await tester.pumpWidget(_host(const Density(), const Gap(17)));
    expect(tester.getSize(find.byType(Gap)).height, 17.0);
  });

  _outsideFlex();

  testWidgets("the same Gap.md moves when the density does", (tester) async {
    await tester.pumpWidget(_host(const Density(), const Gap.md()));
    final compact = tester.getSize(find.byType(Gap)).height;
    await tester.pumpWidget(_host(const Density.normal(), const Gap.md()));
    final normal = tester.getSize(find.byType(Gap)).height;
    expect(normal, greaterThan(compact));
  });
}

// Regression: a Gap with no Flex parent used to throw at layout time and take
// the enclosing subtree with it. One inside an AnimatedSize destroyed a login
// card in the Garage hub, on a build that analyzed clean.
void _outsideFlex() {
  testWidgets("a Gap outside a Flex lays out instead of throwing",
      (tester) async {
    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: GarageTheme(
          data: ThemeData(colorScheme: testScheme, density: const Density()),
          child: const Center(child: SizedBox(width: 100, child: Gap.md())),
        ),
      ),
    );
    // it lays out - that is the whole point, it used to take the subtree down
    expect(tester.getSize(find.byType(Gap)).height, const Density().gapMd);

    // and it says so loudly in debug rather than failing silently
    final reported = tester.takeException();
    expect(reported, isA<FlutterError>());
    expect("$reported", contains("no axis to size along"));
  });
}