'use strict';

/**
 * StealthSync Identity Shield integrates disposable identity generation,
 * stealth address derivation, and mixnet routing for Vaultfire clients.
 */
class StealthSyncIdentityShield {
  constructor({ pqProvider, ringSignatureSuite, mixnetRouter, ethicsOracle }) {
    this.pqProvider = pqProvider;
    this.ringSignatureSuite = ringSignatureSuite;
    this.mixnetRouter = mixnetRouter;
    this.ethicsOracle = ethicsOracle;
  }

  /**
   * Generate a disposable identity bundle with post-quantum keys and stealth addresses.
   */
  createDisposableIdentity(context) {
    const ethicsSignal = { module: 'identity_cloak', action: 'create_identity', context };
    if (!this.ethicsOracle.checkEthics(ethicsSignal)) {
      throw new Error('Ethical override prevented identity issuance');
    }

    const entropy = this.pqProvider.deriveEntropy(context.userSeed);
    const dilithiumKeys = this.pqProvider.generateDilithiumKeyPair(entropy);
    const stealthAddress = this._deriveStealthAddress(dilithiumKeys.publicKey, context.scope);
    const ringMembers = this.ringSignatureSuite.selectCohort(context.scope);
    const ringSignature = this.ringSignatureSuite.createSignature({
      message: stealthAddress,
      keyPair: dilithiumKeys,
      ringMembers,
    });

    return {
      stealthAddress,
      dilithiumPublicKey: dilithiumKeys.publicKey,
      ringSignature,
      expiry: this._calculateExpiry(context),
    };
  }

  /**
   * Wrap a transaction intent with encrypted routing and proxy wallet rotation.
   */
  cloakIntent({ intent, context }) {
    const ethicsSignal = { module: 'identity_cloak', action: 'cloak_intent', context };
    if (!this.ethicsOracle.checkEthics(ethicsSignal)) {
      throw new Error('Ethical override prevented intent cloaking');
    }

    const kyberSession = this.pqProvider.createKyberSession(context.permissionedQuorum);
    const encryptedIntent = this.pqProvider.encryptIntent(intent, kyberSession.sharedSecrets);
    const proxyWallet = this.pqProvider.rotateWallet(context.walletRoot, context.rotationSalt);

    const mixnetRoute = this.mixnetRouter.buildRoute({
      relayHint: context.preferredRelay,
      ringSignature: context.ringSignature,
      quorum: context.permissionedQuorum,
    });

    return {
      encryptedIntent,
      proxyWallet,
      mixnetRoute,
      kyberPayload: kyberSession.payload,
    };
  }

  _deriveStealthAddress(publicKey, scope) {
    return this.pqProvider.deriveStealthAddress({ publicKey, scope });
  }

  _calculateExpiry(context) {
    const ttlMinutes = context.ttlMinutes ?? 30;
    return new Date(Date.now() + ttlMinutes * 60 * 1000).toISOString();
  }
}

module.exports = {
  StealthSyncIdentityShield,
};
