import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:kooltab2/theme.dart';
import 'package:kooltab2/utils/app_update_util.dart';

class KoolTabApp extends StatefulWidget {
  const KoolTabApp({super.key, required this.router});

  final GoRouter router;

  @override
  State<KoolTabApp> createState() => _KoolTabAppState();
}

class _KoolTabAppState extends State<KoolTabApp> {
  @override
  void initState() {
    super.initState();

    WidgetsBinding.instance.addPostFrameCallback((_) {
      _checkForUpdates();
    });
  }

  Future<void> _checkForUpdates() async {
    final updater = AppUpdateUtil(serverUrl: "http://localhost:3000");

    try {
      final update = await updater.checkForUpdate();

      if (update == null) {
        debugPrint("No update available");
        return;
      }

      debugPrint("Update available: ${update.version}");

      if (!mounted) return;

      _showUpdateDialog(update);
    } catch (e) {
      debugPrint("Update check failed: $e");
    }
  }

  void _showUpdateDialog(UpdateInfo update) {
    showDialog(
      context: context,
      barrierDismissible: !update.mandatory,
      builder: (context) {
        return AlertDialog(
          title: const Text("Update available"),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text(
                "Version ${update.version} is available.",
              ),
              const SizedBox(height: 12),
              Text(update.notes),
            ],
          ),
          actions: [
            if (!update.mandatory)
              TextButton(
                onPressed: () {
                  Navigator.pop(context);
                },
                child: const Text("Later"),
              ),

            FilledButton(
              onPressed: () async {
                Navigator.pop(context);

                await _downloadAndInstall(update);
              },
              child: const Text("Update"),
            ),
          ],
        );
      },
    );
  }

  Future<void> _downloadAndInstall(UpdateInfo update) async {
    final updater = AppUpdateUtil(
      serverUrl: "http://localhost:3000",
    );

    try {
      final apk = await updater.downloadApk(
        update,
        onProgress: (progress) {
          debugPrint(
            "Download ${(progress * 100).toStringAsFixed(0)}%",
          );
        },
      );

      final valid = await updater.verifySha256(
        apk,
        update.sha256,
      );

      if (!valid) {
        throw Exception("Invalid update file");
      }

      await updater.installApk(apk);

    } catch (e) {
      debugPrint("Update failed: $e");
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp.router(
      title: 'KoolTab',
      debugShowCheckedModeBanner: false,
      routerConfig: widget.router,
      theme: darkTheme,
    );
  }
}