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// Elaborate on "Handle Subscription Renewal Locally" step. How exactly to do that with in_app_purchase plugin?
// ChatGPT
// Handling subscription renewal locally with the in_app_purchase plugin involves periodically checking the user's subscription status, validating the receipt, and updating access accordingly. Here's an example of how you might implement this step:


import 'dart:async';
import 'package:flutter/material.dart';
import 'package:in_app_purchase/in_app_purchase.dart';

void main() {
  InAppPurchaseConnection.enablePendingPurchases();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  StreamSubscription<List<PurchaseDetails>> _subscription;

  @override
  void initState() {
    super.initState();

    // Start subscription to purchase updates
    _subscription = InAppPurchaseConnection.instance.purchaseUpdatedStream.listen(
      (List<PurchaseDetails> purchases) {
        _handlePurchases(purchases);
      },
    );

    // Schedule periodic validation
    Timer.periodic(Duration(hours: 24), (Timer t) {
      _validateSubscriptions();
    });
  }

  @override
  void dispose() {
    _subscription.cancel();
    super.dispose();
  }

  void _handlePurchases(List<PurchaseDetails> purchases) {
    for (var purchaseDetails in purchases) {
      if (purchaseDetails.status == PurchaseStatus.purchased) {
        // Handle the purchase
        processPurchase(purchaseDetails);
      } else if (purchaseDetails.status == PurchaseStatus.error) {
        // Handle purchase error
        print('Purchase error: ${purchaseDetails.error}');
      }
    }
  }

  void processPurchase(PurchaseDetails purchaseDetails) {
    // Validate the purchase locally
    final validationStatus = validatePurchaseLocally(purchaseDetails);

    if (validationStatus == ReceiptValidationStatus.valid) {
      // Update user access or handle renewal
      updateAccessForPurchase(purchaseDetails);
    } else {
      // Handle invalid receipt
    }
  }

  ReceiptValidationStatus validatePurchaseLocally(
      PurchaseDetails purchaseDetails) {
    // Implement your local receipt validation logic
    // Verify the authenticity of the receipt
    // Return the validation status
  }

  void updateAccessForPurchase(PurchaseDetails purchaseDetails) {
    // Implement your logic to update user access
    // Check the expiration date and update access accordingly
  }

  Future<void> _validateSubscriptions() async {
    // Fetch the user's purchases
    final QueryPurchaseDetailsResponse response =
        await InAppPurchaseConnection.instance.queryPastPurchases();

    // Handle the purchases for renewal
    for (var purchaseDetails in response.pastPurchases) {
      // Validate and update access for each past purchase
      processPurchase(purchaseDetails);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('My App'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () async {
            // Trigger in-app purchase flow
            final PurchaseParam purchaseParam = PurchaseParam(
              productDetails: yourProductDetails,
            );
            final PurchaseDetails purchaseDetails =
                await InAppPurchaseConnection.instance.buyNonConsumable(
              purchaseParam: purchaseParam,
            );

            // Handle purchase result
            if (purchaseDetails.status == PurchaseStatus.purchased) {
              // Process the purchase
              processPurchase(purchaseDetails);
            } else {
              // Handle other purchase statuses
            }
          },
          child: Text('Buy Subscription'),
        ),
      ),
    );
  }
}


// In this example:

// The validateSubscriptions function is scheduled to run periodically (every 24 hours in this case).
// It fetches the user's past purchases using queryPastPurchases and calls the processPurchase function to validate and update access for each past purchase.
// Remember to adjust the frequency of the periodic validation based on your app's requirements. This example provides a basic framework, and you might need to customize it according to your specific needs and the characteristics of your subscription model.





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