import 'dart:ui';

import 'package:flutter_test/flutter_test.dart';
import 'package:pyramid/features/call_ui/inflated_layout.dart';

/// [seconds] lang simulieren (60 Schritte pro Sekunde).
bool _run(InflatedLayout l, double seconds) {
  var moving = true;
  for (var i = 0; i < (seconds * 60).round(); i++) {
    moving = l.step(1 / 60);
  }
  return moving;
}

List<String> _ids(int n) => [for (var i = 0; i < n; i++) 'p$i'];

void main() {
  const phone = Size(390, 620);
  const desktop = Size(1200, 700);

  test('eine Person füllt den ganzen Bereich bis an die Ränder', () {
    final l = InflatedLayout()..sync(['solo'], {}, phone);
    _run(l, 1);
    final r = l.cellBounds('solo');
    expect(r.left, closeTo(l.margin, 0.5));
    expect(r.top, closeTo(l.margin, 0.5));
    expect(r.right, closeTo(phone.width - l.margin, 0.5));
    expect(r.bottom, closeTo(phone.height - l.margin, 0.5));
    // Gerundete Ecken: der Umriss enthält die Ecke des Rechtecks nicht mehr.
    final path = l.outline('solo');
    expect(path.contains(r.topLeft + const Offset(2, 2)), isFalse);
    expect(path.contains(r.center), isTrue);
  });

  test('vier Personen: gleich große Zellen, zusammen fast die ganze Fläche', () {
    final l = InflatedLayout()..sync(_ids(4), {}, desktop);
    final moving = _run(l, 6);
    expect(moving, isFalse, reason: 'kommt nicht zur Ruhe');
    final areas = l.cells.values.map((c) => c.area).toList();
    final avg = areas.reduce((a, b) => a + b) / areas.length;
    for (final a in areas) {
      expect(a, closeTo(avg, avg * 0.08));
    }
    final total = areas.reduce((a, b) => a + b);
    expect(total, greaterThan(l.bounds.width * l.bounds.height * 0.9));
  });

  test('wer spricht, bekommt deutlich mehr Fläche', () {
    final l = InflatedLayout()..sync(_ids(3), {}, phone);
    _run(l, 4);
    l.sync(_ids(3), {'p1'}, phone);
    _run(l, 5);
    final speaker = l.cells['p1']!.area;
    final other = l.cells['p0']!.area;
    expect(speaker / other,
        closeTo(InflatedLayout.speakingShare, InflatedLayout.speakingShare * 0.15));
  });

  test('je mehr Personen, desto kleiner die Zellen', () {
    double avgArea(int n) {
      final l = InflatedLayout()..sync(_ids(n), {}, phone);
      _run(l, 5);
      return l.cells.values.fold<double>(0, (s, c) => s + c.area) / n;
    }

    final a2 = avgArea(2), a5 = avgArea(5), a9 = avgArea(9);
    expect(a5, lessThan(a2));
    expect(a9, lessThan(a5));
  });

  test('Neue pumpen sich auf, Gehende verschwinden', () {
    final l = InflatedLayout()..sync(_ids(2), {}, phone);
    _run(l, 3);
    l.sync(_ids(3), {}, phone);
    expect(l.cells['p2']!.area, lessThan(l.cells['p0']!.area));
    _run(l, 5);
    expect(l.cells['p2']!.area, closeTo(l.cells['p0']!.area, l.cells['p0']!.area * 0.1));
    l.sync(['p0', 'p2'], {}, phone);
    _run(l, 3);
    expect(l.cells.keys.toSet(), {'p0', 'p2'});
  });

  test('Zellen überlappen nicht und jeder Mittelpunkt liegt in seiner Zelle', () {
    final l = InflatedLayout()..sync(_ids(7), {'p3'}, desktop);
    _run(l, 6);
    final paths = {for (final id in l.cells.keys) id: l.outline(id)};
    for (final c in l.cells.values) {
      expect(paths[c.id]!.contains(c.centroid), isTrue, reason: '${c.id} Schwerpunkt');
      for (final other in l.cells.values) {
        if (other.id == c.id) continue;
        expect(paths[other.id]!.contains(c.centroid), isFalse,
            reason: '${c.id} liegt in ${other.id}');
      }
    }
  });

  test('Drehen (hochkant → quer): zwei Personen nebeneinander', () {
    final l = InflatedLayout()..sync(_ids(2), {}, phone);
    _run(l, 3);
    final a = l.cells['p0']!.centroid, b = l.cells['p1']!.centroid;
    expect((a.dy - b.dy).abs(), greaterThan((a.dx - b.dx).abs()), reason: 'hochkant: übereinander');
    l.sync(_ids(2), {}, desktop);
    _run(l, 3);
    final c = l.cells['p0']!.centroid, d = l.cells['p1']!.centroid;
    expect((c.dx - d.dx).abs(), greaterThan((c.dy - d.dy).abs()), reason: 'quer: nebeneinander');
  });
}