import 'dart:math';
import 'dart:convert';
import 'package:crypto/crypto.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'dart:io';
import 'package:flutter/foundation.dart';

class WalletIdentityService {
  static const String _prefsKey = 'wallet_identity_phrase';
  static const String _uploadEnabledKey = 'is_ai_upload_enabled';
  
  // A standard list of 256 words (8 bits of entropy per word)
  static const List<String> _wordList = [
    // ... same as before
    'abandon', 'ability', 'able', 'about', 'above', 'absent', 'absorb', 'abstract', 'absurd', 'abuse',
    'access', 'accident', 'account', 'accuse', 'achieve', 'acid', 'acoustic', 'acquire', 'across', 'act',
    'action', 'actor', 'actress', 'actual', 'adapt', 'add', 'addict', 'address', 'adjust', 'admit',
    'adult', 'advance', 'advice', 'aerobic', 'affair', 'afford', 'afraid', 'again', 'age', 'agent',
    'agree', 'ahead', 'aim', 'air', 'airport', 'aisle', 'alarm', 'album', 'alcohol', 'alert',
    'alien', 'all', 'alley', 'allow', 'almost', 'alone', 'alpha', 'already', 'also', 'alter',
    'always', 'amateur', 'amazing', 'among', 'amount', 'amused', 'analyst', 'anchor', 'ancient', 'anger',
    'angle', 'angry', 'animal', 'ankle', 'announce', 'annual', 'another', 'answer', 'antenna', 'antique',
    'anxiety', 'any', 'apart', 'apology', 'appear', 'apple', 'approve', 'april', 'arch', 'arctic',
    'area', 'arena', 'argue', 'arm', 'armed', 'armor', 'army', 'around', 'arrange', 'arrest',
    'arrive', 'arrow', 'art', 'artefact', 'artist', 'artwork', 'ask', 'aspect', 'assault', 'asset',
    'assist', 'assume', 'asthma', 'athlete', 'atom', 'attack', 'attend', 'attitude', 'attract', 'auction',
    'audit', 'august', 'aunt', 'author', 'auto', 'autumn', 'average', 'avocado', 'avoid', 'awake',
    'aware', 'away', 'awesome', 'awful', 'awkward', 'axis', 'baby', 'bachelor', 'bacon', 'badge',
    'bag', 'balance', 'balcony', 'ball', 'bamboo', 'banana', 'banner', 'bar', 'barely', 'bargain',
    'barrel', 'base', 'basic', 'basket', 'battle', 'beach', 'bean', 'beauty', 'because', 'become',
    'beef', 'before', 'begin', 'behave', 'behind', 'believe', 'below', 'belt', 'bench', 'benefit',
    'best', 'betray', 'better', 'between', 'beyond', 'bicycle', 'bid', 'bike', 'bind', 'biology',
    'bird', 'birth', 'bitter', 'black', 'blade', 'blame', 'blanket', 'blast', 'bleak', 'bless',
    'blind', 'blood', 'blossom', 'blouse', 'blue', 'blur', 'blush', 'board', 'boat', 'body',
    'boil', 'bomb', 'bone', 'bonus', 'book', 'boost', 'border', 'boring', 'borrow', 'boss',
    'bottom', 'bounce', 'box', 'boy', 'bracket', 'brain', 'brand', 'brass', 'brave', 'bread',
    'breeze', 'brick', 'bridge', 'brief', 'bright', 'bring', 'brisk', 'broccoli', 'broken', 'bronze',
    'broom', 'brother', 'brown', 'brush', 'bubble', 'buddy', 'budget', 'buffalo', 'build', 'bulb',
    'bulk', 'bullet', 'bundle', 'bunker', 'burden', 'burger', 'burst', 'bus', 'business', 'butter'
  ];

  /// Vérifie si l'utilisateur a accepté l'envoi de données à l'IA
  Future<bool> isUploadEnabled() async {
    final prefs = await SharedPreferences.getInstance();
    return prefs.getBool(_uploadEnabledKey) ?? false;
  }

  /// Active ou désactive l'envoi de données
  Future<void> setUploadEnabled(bool enabled) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setBool(_uploadEnabledKey, enabled);
  }

  /// Gets the unique 15-word identity phrase
  Future<String> getIdentityPhrase() async {
    final prefs = await SharedPreferences.getInstance();
    
    // Check if we already generated it
    final existingPhrase = prefs.getString(_prefsKey);
    if (existingPhrase != null && existingPhrase.isNotEmpty) {
      return existingPhrase;
    }
    
    // Generate new phrase based on device ID
    final phrase = await _generatePhraseFromDevice();
    
    // Save for future use
    await prefs.setString(_prefsKey, phrase);
    
    return phrase;
  }

  Future<String> _generatePhraseFromDevice() async {
    final deviceInfo = DeviceInfoPlugin();
    String deviceId = 'unknown_device_${DateTime.now().millisecondsSinceEpoch}';
    
    try {
      if (Platform.isAndroid) {
        final androidInfo = await deviceInfo.androidInfo;
        deviceId = androidInfo.id; // Unique Android ID
      } else if (Platform.isIOS) {
        final iosInfo = await deviceInfo.iosInfo;
        deviceId = iosInfo.identifierForVendor ?? deviceId;
      } else if (Platform.isWindows) {
        final windowsInfo = await deviceInfo.windowsInfo;
        deviceId = windowsInfo.deviceId;
      }
    } catch (e) {
      debugPrint('Erreur lecture device ID: $e');
    }
    
    // Add a salt to the device ID
    final salt = 'bully_app_wallet_salt_v1';
    final bytes = utf8.encode(deviceId + salt);
    final digest = sha256.convert(bytes);
    
    // Use the hash to seed a random number generator
    // We take the first 4 bytes of the hash as the seed
    final seedBytes = digest.bytes.sublist(0, 4);
    final seed = (seedBytes[0] << 24) | (seedBytes[1] << 16) | (seedBytes[2] << 8) | seedBytes[3];
    
    final random = Random(seed);
    
    List<String> phraseWords = [];
    for (int i = 0; i < 15; i++) {
      final randomIndex = random.nextInt(_wordList.length);
      phraseWords.add(_wordList[randomIndex]);
    }
    
    return phraseWords.join(' ');
  }
}