import 'dart:convert';
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:package_info_plus/package_info_plus.dart';
import 'package:http/http.dart' as http;

import 'package:nhance_app_pwa/logger.dart';

class AppVersionService {
  /// ✅ Get installed app version (Android + iOS)
  static Future<String> getInstalledVersion() async {
    PackageInfo info = await PackageInfo.fromPlatform();
    return info.version; // Example: "1.9"
  }

  /// ✅ Get App Store version (iOS)
  static Future<String?> getAppStoreVersion(String appId) async {
    final url = Uri.parse("https://itunes.apple.com/lookup?id=$appId");

    final response = await http.get(url);

    if (response.statusCode == 200) {
      final data = jsonDecode(response.body);

      if (data["resultCount"] > 0) {
        return data["results"][0]["version"]; // Example: "1.9"
      }
    }
    return null;
  }

  /// ✅ Get Play Store version (Android)
  /// NOTE: Play Store has no official API. This scrapes the HTML page.
  static Future<String?> getPlayStoreVersion(String packageName) async {
    logDebug(Platform.isAndroid);
    try {
      logDebug('Platform.isAndroid');
      final url = Uri.parse(
        "https://play.google.com/store/apps/details?id=$packageName&hl=en&gl=US",
      );
      logDebug(url);
      final response = await http.get(url);
      logDebug('Get Version Response $response');
      if (response.statusCode == 200) {
        final html = response.body;
        logDebug('Get Version Response $html');
        // Android version usually appears near:  "Current Version"
        final versionRegEx = RegExp(
          r'Current Version.*?<\/span><span[^>]*>(.*?)<\/span>',
          caseSensitive: false,
          dotAll: true,
        );
        logDebug('versionRegEx $versionRegEx');
        final match = versionRegEx.firstMatch(html);
        logDebug('match $match');
        if (match != null) {
          return match.group(1)?.trim();
        }
      }
    } catch (e) {
      logDebug("Play Store error: $e");
    }

    return null;
  }


  /// ✅ Unified function to get latest store version based on platform
  static Future<String?> getLatestStoreVersion({
    required String androidPackage,
    required String iosAppId,
  }) async {
    if (kIsWeb) return null;

    if (Platform.isAndroid) {
      logDebug('Platform.isAndroid');
      return await getPlayStoreVersion(androidPackage);
    }

    if (Platform.isIOS) {
      return await getAppStoreVersion(iosAppId);
    }

    return null;
  }
}