import 'package:cookit/src/recipes/text_breaks.dart';
import 'package:flutter/painting.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  String shown(String text) => withNaturalBreaks(text).replaceAll('​', '|');

  test('breaks after hyphens, ampersands and slashes, and between words written together', () {
    expect(shown('ApfelWeißkohlPfanne&Schupfi'), 'Apfel|Weißkohl|Pfanne&|Schupfi');
    expect(shown('Brokkoli-Sahne-Nudeln'), 'Brokkoli-|Sahne-|Nudeln');
    expect(shown('AvocadoMinze Smoothie'), 'Avocado|Minze Smoothie');
    expect(shown('Salz/Pfeffer'), 'Salz/|Pfeffer');
    expect(shown('Öl-Ärger'), 'Öl-|Ärger');
  });

  test('leaves ordinary names and abbreviations alone', () {
    expect(shown('Tomatensoße mit Spätzle'), 'Tomatensoße mit Spätzle');
    expect(shown('BBQ Burger'), 'BBQ Burger');
    expect(shown('Gef. Hähnchenfilet'), 'Gef. Hähnchenfilet');
    expect(shown('Rösti - knusprig'), 'Rösti - knusprig');
    expect(withNaturalBreaks('ApfelWeißkohl').replaceAll('​', ''), 'ApfelWeißkohl');
  });

  test('a line now ends at a natural break, not mid-word', () {
    // Test font: every glyph is fontSize wide. Room for 15 glyphs.
    List<double> lineWidths(String text) {
      final p = TextPainter(
        text: TextSpan(text: text, style: const TextStyle(fontSize: 10)),
        textDirection: TextDirection.ltr,
      )..layout(maxWidth: 155);
      return [for (final l in p.computeLineMetrics()) l.width];
    }

    expect(lineWidths('ApfelWeißkohlPfanne'), [150, 40]); // "ApfelWeißkohlPf" | "anne"
    expect(lineWidths(withNaturalBreaks('ApfelWeißkohlPfanne')), [130, 60]); // "ApfelWeißkohl" | "Pfanne"
  });
}