import 'dart:async';
import 'dart:io';

import 'package:connectivity_plus/connectivity_plus.dart';
import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:universal_html/html.dart' as html;
import 'dart:developer' as dev;
import 'package:js/js.dart';

@JS('startIPDetection')
external void startIPDetectionJS();

@JS('deviceIPResult')
external String? get deviceIPResultJS;

@JS('deviceIPDetecting')
external bool? get deviceIPDetectingJS;

abstract class ConnectivityService {
  void subscribeToConnectivityChange({
    required Function() onInternetDisConnected,
    required Function() onInternetConnected,
  });

  Future<String> getCurrentScreenIP();
}

class ConnectivityServiceImp implements ConnectivityService {
  Connectivity connectivityInstance;

  ConnectivityServiceImp({required this.connectivityInstance});

  @override
  subscribeToConnectivityChange({
    required Function() onInternetDisConnected,
    required Function() onInternetConnected,
  }) {
    connectivityInstance.onConnectivityChanged.listen((List<ConnectivityResult> event) async {
      switch (event.first) {
        case ConnectivityResult.wifi:
        case ConnectivityResult.ethernet:
          onInternetConnected();
          break;
        case ConnectivityResult.none:
          onInternetDisConnected();
          break;
        case ConnectivityResult.mobile:
        case ConnectivityResult.bluetooth:
        case ConnectivityResult.vpn:
        case ConnectivityResult.other:
          break;
      }
    });
  }

  @override
  Future<String> getCurrentScreenIP() async {
    // Web: Auto-detect IP or get from URL/localStorage
    if (kIsWeb) {
      dev.log('🌐 Web platform - attempting to get device IP...');

      // Priority 1: Check URL query parameter: ?ip=12.4.5.1
      final uri = Uri.base;
      if (uri.queryParameters.containsKey('ip')) {
        final ip = uri.queryParameters['ip']!;
        dev.log('✅ IP from URL parameter: $ip');
        try {
          html.window.localStorage['device_ip'] = ip;
          dev.log('💾 Saved IP to localStorage: $ip');
        } catch (e) {
          dev.log('❌ Failed to save IP to localStorage: $e');
        }
        return ip;
      }

      // Priority 2: Check localStorage FIRST (before auto-detect to avoid delay)
      String? storedIp;
      try {
        storedIp = html.window.localStorage['device_ip'];
        dev.log('🔍 Checking localStorage for saved IP...');
        dev.log('   localStorage[device_ip] = $storedIp');
        dev.log('   storedIp type: ${storedIp.runtimeType}');
        dev.log('   storedIp == null: ${storedIp == null}');
        dev.log('   storedIp.isEmpty: ${storedIp?.isEmpty}');
        dev.log('   storedIp == "null": ${storedIp == 'null'}');
      } catch (e) {
        dev.log('❌ Error accessing localStorage: $e');
        storedIp = null;
      }

      if (storedIp != null && storedIp.isNotEmpty && storedIp != 'null') {
        dev.log('✅ IP from localStorage: $storedIp');
        return storedIp;
      } else {
        dev.log('⚠️ localStorage check failed - storedIp: "$storedIp"');
      }

      // Priority 3: Try to auto-detect IP using WebRTC (only if not in localStorage)
      dev.log('📡 No stored IP found, attempting auto-detection...');
      try {
        final detectedIP = await _autoDetectIP();
        if (detectedIP != null && detectedIP.isNotEmpty) {
          dev.log('✅ IP auto-detected from device: $detectedIP');
          try {
            html.window.localStorage['device_ip'] = detectedIP;
            dev.log('💾 Saved auto-detected IP to localStorage');
          } catch (e) {
            dev.log('❌ Failed to save auto-detected IP to localStorage: $e');
          }
          return detectedIP;
        }
      } catch (e) {
        dev.log('⚠️ Auto-detection failed: $e');
      }

      // No IP found
      dev.log('⚠️ No IP address detected');
      dev.log('📌 Add to URL: ${uri.origin}/?ip=YOUR_DEVICE_IP');
      return '';
    }

    // Android Native: Get actual IP from network interface
    dev.log('📱 Android native - getting IP from network interface...');
    const eth = "eth0";
    const wlan = "wlan0";
    String currentDeviceIp = "";

    try {
      final ips = await NetworkInterface.list(type: InternetAddressType.IPv4);
      for (var interface in ips) {
        if (interface.name == eth) {
          for (var address in interface.addresses) {
            currentDeviceIp = address.address;
            dev.log('✅ IP from ethernet (eth0): $currentDeviceIp');
          }
        }
        if (interface.name == wlan) {
          for (var address in interface.addresses) {
            currentDeviceIp = address.address;
            dev.log('✅ IP from WiFi (wlan0): $currentDeviceIp');
          }
        }
      }
    } catch (e) {
      dev.log('❌ Failed to get network interface IP: $e');
    }

    return currentDeviceIp;
  }

  /// Auto-detect device IP using WebRTC (works on web browsers)
  Future<String?> _autoDetectIP() async {
    try {
      // Start IP detection in JavaScript
      startIPDetectionJS();

      // Poll for result
      final stopwatch = Stopwatch()..start();
      while (stopwatch.elapsed.inSeconds < 5) {
        await Future.delayed(const Duration(milliseconds: 100));

        // Check if still detecting
        final isDetecting = deviceIPDetectingJS;
        if (isDetecting == false || isDetecting == null) {
          // Detection completed
          final result = deviceIPResultJS;

          if (result != null && result != 'TIMEOUT' && result != 'ERROR') {
            return result;
          }
          break;
        }
      }

      dev.log('⏱️ IP detection timeout or failed');
      return null;
    } catch (e) {
      dev.log('❌ Auto-detection error: $e');
      return null;
    }
  }
}