import 'package:block_seasons/services/ad_frequency_policy.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  final t0 = DateTime(2026, 1, 1, 12, 0, 0);

  AdFrequencyPolicy primed() {
    // Past the 5-stage protection and the 3-stage gap, last ad long ago.
    final p = AdFrequencyPolicy();
    for (var i = 0; i < 6; i++) {
      p.onRoundStart();
      p.onStageCompleted();
    }
    return p;
  }

  test('first 5 stages are protected from interstitials', () {
    final p = AdFrequencyPolicy();
    for (var i = 0; i < 5; i++) {
      p.onRoundStart();
      p.onStageCompleted();
      expect(p.canShowInterstitial(t0), isFalse, reason: 'stage ${i + 1}');
    }
    // 6th completed stage clears protection.
    p.onRoundStart();
    p.onStageCompleted();
    expect(p.canShowInterstitial(t0), isTrue);
  });

  test('needs >=3 stages since the last interstitial', () {
    final p = primed();
    expect(p.canShowInterstitial(t0), isTrue);
    p.onInterstitialShown(t0);
    final later = t0.add(const Duration(seconds: 120));
    // Only 2 stages since: still blocked even though time elapsed.
    p.onRoundStart();
    p.onStageCompleted();
    p.onRoundStart();
    p.onStageCompleted();
    expect(p.canShowInterstitial(later), isFalse);
    // 3rd stage opens the gate.
    p.onRoundStart();
    p.onStageCompleted();
    expect(p.canShowInterstitial(later), isTrue);
  });

  test('needs >=90s since the last interstitial', () {
    final p = primed();
    p.onInterstitialShown(t0);
    for (var i = 0; i < 3; i++) {
      p.onRoundStart();
      p.onStageCompleted();
    }
    expect(p.canShowInterstitial(t0.add(const Duration(seconds: 89))), isFalse);
    expect(p.canShowInterstitial(t0.add(const Duration(seconds: 90))), isTrue);
  });

  test('a rewarded watched this round blocks the interstitial', () {
    final p = primed();
    expect(p.canShowInterstitial(t0), isTrue);
    p.onRewardedShown();
    expect(p.canShowInterstitial(t0), isFalse);
    // Next round clears it.
    p.onRoundStart();
    p.onStageCompleted();
    expect(p.canShowInterstitial(t0), isTrue);
  });

  test('showing an interstitial resets the stage counter', () {
    final p = primed();
    p.onInterstitialShown(t0);
    final later = t0.add(const Duration(seconds: 200));
    expect(p.canShowInterstitial(later), isFalse); // 0 stages since
  });
}