#Lecture 009 — Rewarded Interstitial Ads

// lib/admob/rewarded_interstitial_ad_helper.dart
import 'package:flutter/foundation.dart';
import 'package:google_mobile_ads/google_mobile_ads.dart';

import 'admob_manager.dart';

class RewardedInterstitialAdHelper {
  bool isAdLoaded = false;
  RewardedInterstitialAd? _ad;

  void loadRewardedInterstitialAd({
    required VoidCallback onAdShowFullScreen,
    required VoidCallback onAdDismissed,
  }) {
    RewardedInterstitialAd.load(
      adUnitId: AdmobManager.rewardedInterstitialId,
      request: const AdRequest(),
      rewardedInterstitialAdLoadCallback: RewardedInterstitialAdLoadCallback(
        onAdLoaded: (ad) {
          isAdLoaded = true;
          _ad = ad;

          ad.fullScreenContentCallback = FullScreenContentCallback(
            onAdShowedFullScreenContent: (_) => onAdShowFullScreen(),
            onAdDismissedFullScreenContent: (ad) {
              ad.dispose();
              isAdLoaded = false;
              _ad = null;
              onAdDismissed();
              loadRewardedInterstitialAd(
                onAdShowFullScreen: onAdShowFullScreen,
                onAdDismissed: onAdDismissed,
              );
            },
            onAdFailedToShowFullScreenContent: (ad, error) {
              ad.dispose();
              isAdLoaded = false;
              _ad = null;
            },
          );
        },
        onAdFailedToLoad: (error) {
          isAdLoaded = false;
          debugPrint('Rewarded interstitial failed: ${error.code} ${error.message}');
        },
      ),
    );
  }

  bool showAdIfAvailable(void Function(RewardItem reward) onEarnedReward) {
    if (_ad == null || !isAdLoaded) return false;
    _ad!.show(onUserEarnedReward: (_, reward) => onEarnedReward(reward));
    return true;
  }

  void dispose() => _ad?.dispose();
}

// lib/screen_rewarded_interstitial_ads.dart
import 'package:flutter/material.dart';

import 'admob/ad_state.dart';
import 'admob/rewarded_interstitial_ad_helper.dart';

class ScreenRewardedInterstitialAds extends StatefulWidget {
  const ScreenRewardedInterstitialAds({super.key});

  @override
  State<ScreenRewardedInterstitialAds> createState() =>
      _ScreenRewardedInterstitialAdsState();
}

class _ScreenRewardedInterstitialAdsState
    extends State<ScreenRewardedInterstitialAds> {
  final adHelper = RewardedInterstitialAdHelper();
  int _coins = 0;

  @override
  void initState() {
    super.initState();
    adHelper.loadRewardedInterstitialAd(
      onAdShowFullScreen: () => AdState().disableAppOpenAds(),
      onAdDismissed: () => AdState().enableAppOpenAdsAfterCooldown(),
    );
  }

  @override
  void dispose() {
    adHelper.dispose();
    super.dispose();
  }

  void _showDialogThenAd() {
    showDialog(
      context: context,
      builder: (dialogContext) => AlertDialog(
        title: const Text('Information'),
        content: const Text(
          'To access this feature you need to watch an ad first.',
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(dialogContext).pop(),
            child: const Text('Cancel'),
          ),
          TextButton(
            onPressed: () {
              Navigator.of(dialogContext).pop();
              _watchAd();
            },
            child: const Text('Watch ad'),
          ),
        ],
      ),
    );
  }

  void _watchAd() {
    final shown = adHelper.showAdIfAvailable((reward) {
      setState(() => _coins += reward.amount.toInt());
    });
    if (!shown) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Ad is not ready yet, try again')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Rewarded Interstitial Ads')),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Text('Coins: $_coins', style: const TextStyle(fontSize: 24)),
            const SizedBox(height: 20),
            ElevatedButton(
              onPressed: _showDialogThenAd,
              child: const Text('Download'),
            ),
          ],
        ),
      ),
    );
  }
}