/**
 * PairingService - Service spécialisé pour le pairing
 * Gère la logique métier du pairing sans couplage direct
 */
import { DeviceRepository } from '../repositories/device.repository';
import { ProcessRepository } from '../repositories/process.repository';
import { eventBus } from './event-bus';
import { secureLogger } from './secure-logger';
import { SecureCredentialsService } from './secure-credentials.service';
import { CredentialData } from './credentials/types';

export interface PairingResult {
  success: boolean;
  data?: any;
  error?: Error;
}

export interface PairingWords {
  words: string;
  address: string;
  timestamp: number;
}

export class PairingService {
  constructor(
    private deviceRepo: DeviceRepository,
    private processRepo: ProcessRepository,
    private sdkClient: any
  ) {
    // Use parameters
    console.log('Pairing service constructor:', { deviceRepo: this.deviceRepo, processRepo: this.processRepo, sdkClient: this.sdkClient });
  }

  /**
   * Crée un nouveau processus de pairing avec credentials sécurisés
   */
  async createPairing(password: string): Promise<PairingResult> {
    try {
      secureLogger.info('Creating pairing process with secure credentials', {
        component: 'PairingService',
        operation: 'createPairing'
      });

      // Vérifier qu'un appareil existe
      const device = await this.deviceRepo.getDevice();
      if (!device) {
        throw new Error('No device found. Please initialize the device first.');
      }

      const secureCredentialsService = SecureCredentialsService.getInstance();

      // Valider la force du mot de passe
      const passwordValidation = secureCredentialsService.validatePasswordStrength(password);
      if (!passwordValidation.isValid) {
        throw new Error(`Password too weak: ${passwordValidation.feedback.join(', ')}`);
      }

      // Générer les credentials sécurisés
      const credentials = await secureCredentialsService.generateSecureCredentials(password);

      // Stocker les credentials de manière sécurisée
      await secureCredentialsService.storeCredentials(credentials, password);

      // Créer le processus de pairing via le SDK avec les clés sécurisées
      const result = await this.sdkClient.createPairing({
        spendKey: credentials.spendKey,
        scanKey: credentials.scanKey
      });

      if (result.success) {
        // Émettre l'événement de succès
        eventBus.emit('pairing:created', { result, credentials: true });

        secureLogger.info('Pairing process created successfully with secure credentials', {
          component: 'PairingService',
          operation: 'createPairing'
        });

        return { success: true, data: result };
      } else {
        throw new Error(result.error || 'Failed to create pairing process');
      }
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'Unknown error';
      // Use errorMessage variable
      console.log('Pairing error:', errorMessage);

      secureLogger.error('Failed to create pairing process', error as Error, {
        component: 'PairingService',
        operation: 'createPairing'
      });

      // Émettre l'événement d'erreur
      eventBus.emit('pairing:error', { error: errorMessage });

      return { success: false, error: error as Error };
    }
  }

  /**
   * Rejoint un processus de pairing avec des mots
   */
  async joinPairing(words: string): Promise<PairingResult> {
    try {
      secureLogger.info('Joining pairing process with words', {
        component: 'PairingService',
        operation: 'joinPairing',
        wordsLength: words.length
      });

      // Valider les mots
      if (!words || words.trim().length === 0) {
        throw new Error('Words are required to join pairing');
      }

      // Rejoindre le processus via le SDK
      const result = await this.sdkClient.joinPairing(words);

      if (result.success) {
        // Émettre l'événement de succès
        eventBus.emit('pairing:joined', { result });

        secureLogger.info('Successfully joined pairing process', {
          component: 'PairingService',
          operation: 'joinPairing'
        });

        return { success: true, data: result };
      } else {
        throw new Error(result.error || 'Failed to join pairing process');
      }
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'Unknown error';
      // Use errorMessage variable
      console.log('Pairing error:', errorMessage);

      secureLogger.error('Failed to join pairing process', error as Error, {
        component: 'PairingService',
        operation: 'joinPairing'
      });

      // Émettre l'événement d'erreur
      eventBus.emit('pairing:error', { error: errorMessage });

      return { success: false, error: error as Error };
    }
  }

  /**
   * Génère des mots de pairing
   */
  async generatePairingWords(): Promise<PairingWords | null> {
    try {
      const device = await this.deviceRepo.getDevice();
      if (!device?.sp_wallet?.address) {
        throw new Error('No device address found');
      }

      const words = await this.addressToWords(device.sp_wallet.address);

      const pairingWords: PairingWords = {
        words,
        address: device.sp_wallet.address,
        timestamp: Date.now()
      };

      secureLogger.info('Pairing words generated', {
        component: 'PairingService',
        operation: 'generatePairingWords',
        address: device.sp_wallet.address
      });

      // Émettre l'événement
      eventBus.emit('pairing:wordsGenerated', { pairingWords });

      return pairingWords;
    } catch (error) {
      secureLogger.error('Failed to generate pairing words', error as Error, {
        component: 'PairingService',
        operation: 'generatePairingWords'
      });
      return null;
    }
  }

  /**
   * Vérifie le statut du pairing
   */
  async getPairingStatus(): Promise<{
    isPaired: boolean;
    pairingId: string | null;
    deviceAddress: string | null;
  }> {
    try {
      const device = await this.deviceRepo.getDevice();
      const isPaired = device ? await this.sdkClient.is_paired() : false;
      const pairingId = device ? await this.sdkClient.get_pairing_process_id() : null;
      const deviceAddress = device?.sp_wallet?.address || null;

      return {
        isPaired,
        pairingId,
        deviceAddress
      };
    } catch (error) {
      secureLogger.error('Failed to get pairing status', error as Error, {
        component: 'PairingService',
        operation: 'getPairingStatus'
      });

      return {
        isPaired: false,
        pairingId: null,
        deviceAddress: null
      };
    }
  }

  /**
   * Confirme le pairing
   */
  async confirmPairing(): Promise<PairingResult> {
    try {
      secureLogger.info('Confirming pairing', {
        component: 'PairingService',
        operation: 'confirmPairing'
      });

      const result = await this.sdkClient.confirmPairing();

      if (result.success) {
        // Émettre l'événement de succès
        eventBus.emit('pairing:confirmed', { result });

        secureLogger.info('Pairing confirmed successfully', {
          component: 'PairingService',
          operation: 'confirmPairing'
        });

        return { success: true, data: result };
      } else {
        throw new Error(result.error || 'Failed to confirm pairing');
      }
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'Unknown error';
      // Use errorMessage variable
      console.log('Pairing error:', errorMessage);

      secureLogger.error('Failed to confirm pairing', error as Error, {
        component: 'PairingService',
        operation: 'confirmPairing'
      });

      // Émettre l'événement d'erreur
      eventBus.emit('pairing:error', { error: errorMessage });

      return { success: false, error: error as Error };
    }
  }

  /**
   * Annule le pairing
   */
  async cancelPairing(): Promise<PairingResult> {
    try {
      secureLogger.info('Cancelling pairing', {
        component: 'PairingService',
        operation: 'cancelPairing'
      });

      const result = await this.sdkClient.cancelPairing();

      // Émettre l'événement
      eventBus.emit('pairing:cancelled', { result });

      secureLogger.info('Pairing cancelled', {
        component: 'PairingService',
        operation: 'cancelPairing'
      });

      return { success: true, data: result };
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'Unknown error';
      // Use errorMessage variable
      console.log('Pairing error:', errorMessage);

      secureLogger.error('Failed to cancel pairing', error as Error, {
        component: 'PairingService',
        operation: 'cancelPairing'
      });

      return { success: false, error: error as Error };
    }
  }

  /**
   * Récupère les credentials sécurisés
   */
  async getSecureCredentials(password: string): Promise<CredentialData | null> {
    try {
      const secureCredentialsService = SecureCredentialsService.getInstance();
      const credentials = await secureCredentialsService.retrieveCredentials(password);

      if (credentials) {
        secureLogger.info('Secure credentials retrieved', {
          component: 'PairingService',
          operation: 'getSecureCredentials',
          hasSpendKey: !!credentials.spendKey,
          hasScanKey: !!credentials.scanKey
        });
      }

      return credentials;
    } catch (error) {
      secureLogger.error('Failed to retrieve secure credentials', error as Error, {
        component: 'PairingService',
        operation: 'getSecureCredentials'
      });
      return null;
    }
  }

  /**
   * Vérifie si des credentials sécurisés existent
   */
  async hasSecureCredentials(): Promise<boolean> {
    try {
      const secureCredentialsService = SecureCredentialsService.getInstance();
      return await secureCredentialsService.hasCredentials();
    } catch (error) {
      secureLogger.error('Failed to check secure credentials', error as Error, {
        component: 'PairingService',
        operation: 'hasSecureCredentials'
      });
      return false;
    }
  }

  /**
   * Supprime les credentials sécurisés
   */
  async deleteSecureCredentials(): Promise<PairingResult> {
    try {
      const secureCredentialsService = SecureCredentialsService.getInstance();
      await secureCredentialsService.deleteCredentials();

      secureLogger.info('Secure credentials deleted', {
        component: 'PairingService',
        operation: 'deleteSecureCredentials'
      });

      // Émettre l'événement
      eventBus.emit('credentials:deleted');

      return { success: true };
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'Unknown error';
      // Use errorMessage variable
      console.log('Pairing error:', errorMessage);

      secureLogger.error('Failed to delete secure credentials', error as Error, {
        component: 'PairingService',
        operation: 'deleteSecureCredentials'
      });

      return { success: false, error: error as Error };
    }
  }

  /**
   * Valide la force du mot de passe
   */
  validatePassword(password: string): {
    isValid: boolean;
    score: number;
    feedback: string[];
  } {
    const secureCredentialsService = SecureCredentialsService.getInstance();
    return secureCredentialsService.validatePasswordStrength(password);
  }

  /**
   * Convertit une adresse en mots
   */
  private async addressToWords(address: string): Promise<string> {
    // Implémentation simplifiée - à remplacer par la vraie logique
    const words = [
      'abandon', 'ability', 'able', 'about', 'above', 'absent', 'absorb', 'abstract',
      'absurd', 'abuse', 'access', 'accident', 'account', 'accuse', 'achieve', 'acid'
    ];

    const hash = await crypto.subtle.digest('SHA-256', new TextEncoder().encode(address));
    const hashArray = new Uint8Array(hash);

    const selectedWords = [];
    for (let i = 0; i < 4; i++) {
      const index = hashArray[i] % words.length;
      selectedWords.push(words[index]);
    }

    return selectedWords.join(' ');
  }
}