import 'package:flutter/material.dart';
import 'package:wanisclient/config/AppSnackbar.dart';
import '../services/public_keys_service.dart';

class PublicKeysProvider extends ChangeNotifier {
  final PublicKeysService _service = PublicKeysService();
  static final PublicKeysProvider _instance = PublicKeysProvider._internal();
  factory PublicKeysProvider() {
    return _instance;
  }
  PublicKeysProvider._internal();
  // ── loading state ─────────────────────────────────────────────
  bool _isLoading = false;
  bool _isLoaded = false;
  bool _isLoadingSecrets = false;
  String? _error;

  bool get isLoading => _isLoading;
  bool get isLoaded => _isLoaded;
  bool get isLoadingSecrets => _isLoadingSecrets;
  String? get error => _error;

  // ── public keys — available before login ──────────────────────
  String? mapboxToken;
  String? pubnubPublishKey;
  String? pubnubSubscribeKey;
  String? agoraAppId;
  String? recaptchaSiteKey;
  bool isTestEnvironment = false;

  // ── secret keys — available only after login ──────────────────
  String? googleMapKey;
  String? osmKey;
  String? pubnubSecretKey;
  String? agoraCertificate;
  String? recaptchaSecret;
  String? winsmsKey;
  String? winsmsSender;
  String? tunisiesmsKey;
  String? tunisiesmsSnder;
  String? twilioAuthToken;
  String? twilioAccountSid;
  String? twilioFromNo;
  String? twilioVerifySid;

  // ── missing keys check ────────────────────────────────────────
  List<String> get missingPublicKeys {
    final List<String> missing = [];
    if (!_has(mapboxToken))         missing.add('Mapbox');
    if (!_has(pubnubPublishKey))    missing.add('PubNub publish');
    if (!_has(pubnubSubscribeKey))  missing.add('PubNub subscribe');
    if (!_has(agoraAppId))          missing.add('Agora App ID');
    return missing;
  }

  bool get allPublicKeysConfigured => missingPublicKeys.isEmpty;

  // ── load public keys — call at app startup ────────────────────
  Future<void> loadPublicKeys() async {
    if (_isLoading) return;
    _isLoading = true;
    _error = null;
    notifyListeners();

    try {
      final keysResponse    = await _service.fetchPublicKeys();
      final profileResponse = await _service.fetchProfile();

      if (keysResponse.data != null) {
        final data = keysResponse.data!;
        mapboxToken        = _parse(data['mapbox']);
        pubnubPublishKey   = _parse(data['pubnubpublic']);
        pubnubSubscribeKey = _parse(data['pubnubsubscribe']);
        agoraAppId         = _parse(data['agoraid']);
        recaptchaSiteKey   = _parse(data['recaptchasitekey']);
      } else {
        _error = keysResponse.errorMessage;
      }

      if (profileResponse.data != null) {
        isTestEnvironment = profileResponse.data!['isTest'] == true;
      }

      _isLoaded = true;
    } catch (e) {
      _error = e.toString();
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }

  // ── load secret keys — call right after login ─────────────────
  Future<void> loadSecretKeys() async {
    if (_isLoadingSecrets) return;
    _isLoadingSecrets = true;
    notifyListeners();

    try {
      final response = await _service.fetchSecretKeys();

      if (response.data != null) {
        final data = response.data!;
        googleMapKey     = _parse(data['googlemap']);
        osmKey           = _parse(data['osm']);
        pubnubSecretKey  = _parse(data['pubnubsecret']);
        agoraCertificate = _parse(data['agoracertificate']);
        recaptchaSecret  = _parse(data['recaptcha']);
        winsmsKey        = _parse(data['winsmskey']);
        winsmsSender     = _parse(data['winsmssender']);
        tunisiesmsKey    = _parse(data['tunisiesmskey']);
        tunisiesmsSnder  = _parse(data['tunisiesmssender']);
        twilioAuthToken  = _parse(data['twilioauthtoken']);
        twilioAccountSid = _parse(data['twilioaccountsid']);
        twilioFromNo     = _parse(data['twiliofromo']);
        twilioVerifySid  = _parse(data['twilioverifysid']);
      }
    } catch (e) {
      debugPrint('[PublicKeysProvider] loadSecretKeys error: $e');
    } finally {
      _isLoadingSecrets = false;
      notifyListeners();
    }
  }

  // ── clear secrets on logout ───────────────────────────────────
  void clearSecretKeys() {
    googleMapKey     = null;
    osmKey           = null;
    pubnubSecretKey  = null;
    agoraCertificate = null;
    recaptchaSecret  = null;
    winsmsKey        = null;
    winsmsSender     = null;
    tunisiesmsKey    = null;
    tunisiesmsSnder  = null;
    twilioAuthToken  = null;
    twilioAccountSid = null;
    twilioFromNo     = null;
    twilioVerifySid  = null;
    notifyListeners();
  }

  // ── helpers ───────────────────────────────────────────────────
  String? _parse(dynamic v) {
    if (v == null) return null;
    final s = v.toString().trim();
    return s.isEmpty ? null : s;
  }

  bool _has(String? v) => v != null && v.isNotEmpty;


}
final publickeys = PublicKeysProvider();
extension PublicKeysGuard on PublicKeysProvider {
  bool guardKey(String? key, String keyName) {
    if (key == null || key.isEmpty) {
      AppSnackbar.showWarning("Keys", '⚠️ $keyName not configured');
      debugPrint('[PublicKeysProvider] ⚠️ $keyName not configured');
      return false;
    }
    return true;
  }
}