/**
 * DAIS Service - DAARION Autonomous Identity System
 * Based on: docs/foundation/DAARION_Identity_And_Access_Draft_v1.md
 */

import { db } from '../../infra/db/client';
import { logger } from '../../infra/logger/logger';
import type {
  DaisIdentity,
  DaisProfile,
  DaisEmail,
  DaisWallet,
  CreateDaisRequest,
  DaisCreationResult,
  DaisTrustLevel,
} from '../../domain/dais/types';
import { v4 as uuidv4 } from 'uuid';

export class DaisService {
  /**
   * Create a new DAIS identity
   */
  async createIdentity(request: CreateDaisRequest): Promise<DaisCreationResult> {
    const id = `dais-${uuidv4()}`;
    const did = `did:daarion:${uuidv4()}`;
    
    try {
      // Create DAIS identity
      const identity = await db.query<DaisIdentity>(
        `INSERT INTO dais_identities (id, did, default_email, default_wallet, trust_level)
         VALUES ($1, $2, $3, $4, $5)
         RETURNING *`,
        [id, did, request.email || null, request.walletAddress || null, 'agent']
      );

      // Add email if provided
      if (request.email) {
        await db.query(
          `INSERT INTO dais_emails (dais_id, email, verified)
           VALUES ($1, $2, false)`,
          [id, request.email]
        );
      }

      // Add wallet if provided
      if (request.walletAddress) {
        await db.query(
          `INSERT INTO dais_wallets (dais_id, wallet_address, network, verified)
           VALUES ($1, $2, $3, false)`,
          [id, request.walletAddress, request.network || 'evm']
        );
      }

      // Create agent linked to DAIS
      const agentId = `agent-${uuidv4()}`;
      const matrixHandle = `@${agentId}:matrix.daarion.city`;

      await db.query(
        `INSERT INTO agents (id, name, kind, dais_identity_id, agent_role, home_microdao_id)
         VALUES ($1, $2, $3, $4, $5, $6)`,
        [agentId, 'New Agent', 'personal', id, 'regular', 'daarion']
      );

      // Update DAIS with matrix handle
      await db.query(
        `UPDATE dais_identities SET matrix_handle = $1 WHERE id = $2`,
        [matrixHandle, id]
      );

      logger.info(`Created DAIS identity: ${id}, agent: ${agentId}`);

      return {
        identity: identity.rows[0],
        agentId,
        matrixHandle,
      };
    } catch (error) {
      logger.error('Failed to create DAIS identity', error);
      throw error;
    }
  }

  /**
   * Get DAIS profile with all linked identities
   */
  async getProfile(daisId: string): Promise<DaisProfile | null> {
    try {
      const identity = await db.query<DaisIdentity>(
        `SELECT * FROM dais_identities WHERE id = $1`,
        [daisId]
      );

      if (identity.rows.length === 0) {
        return null;
      }

      const emails = await db.query<DaisEmail>(
        `SELECT * FROM dais_emails WHERE dais_id = $1`,
        [daisId]
      );

      const wallets = await db.query<DaisWallet>(
        `SELECT * FROM dais_wallets WHERE dais_id = $1`,
        [daisId]
      );

      const keys = await db.query(
        `SELECT * FROM dais_keys WHERE dais_id = $1 AND revoked_at IS NULL`,
        [daisId]
      );

      return {
        identity: identity.rows[0],
        emails: emails.rows,
        wallets: wallets.rows,
        keys: keys.rows,
      };
    } catch (error) {
      logger.error(`Failed to get DAIS profile: ${daisId}`, error);
      throw error;
    }
  }

  /**
   * Get DAIS by agent ID
   */
  async getByAgentId(agentId: string): Promise<DaisProfile | null> {
    try {
      const agent = await db.query(
        `SELECT dais_identity_id FROM agents WHERE id = $1`,
        [agentId]
      );

      if (agent.rows.length === 0 || !agent.rows[0].dais_identity_id) {
        return null;
      }

      return this.getProfile(agent.rows[0].dais_identity_id);
    } catch (error) {
      logger.error(`Failed to get DAIS by agent: ${agentId}`, error);
      throw error;
    }
  }

  /**
   * Add email to DAIS
   */
  async addEmail(daisId: string, email: string): Promise<DaisEmail> {
    try {
      const result = await db.query<DaisEmail>(
        `INSERT INTO dais_emails (dais_id, email, verified)
         VALUES ($1, $2, false)
         RETURNING *`,
        [daisId, email]
      );

      logger.info(`Added email to DAIS ${daisId}: ${email}`);
      return result.rows[0];
    } catch (error) {
      logger.error(`Failed to add email to DAIS: ${daisId}`, error);
      throw error;
    }
  }

  /**
   * Verify email
   */
  async verifyEmail(daisId: string, email: string): Promise<void> {
    try {
      await db.query(
        `UPDATE dais_emails 
         SET verified = true, verified_at = now()
         WHERE dais_id = $1 AND email = $2`,
        [daisId, email]
      );

      // Update trust level if this is first verified email
      await this.updateTrustLevel(daisId);

      logger.info(`Verified email for DAIS ${daisId}: ${email}`);
    } catch (error) {
      logger.error(`Failed to verify email: ${daisId}`, error);
      throw error;
    }
  }

  /**
   * Add wallet to DAIS
   */
  async addWallet(
    daisId: string, 
    walletAddress: string, 
    network: 'evm' | 'ton' | 'solana' = 'evm'
  ): Promise<DaisWallet> {
    try {
      const result = await db.query<DaisWallet>(
        `INSERT INTO dais_wallets (dais_id, wallet_address, network, verified)
         VALUES ($1, $2, $3, false)
         RETURNING *`,
        [daisId, walletAddress, network]
      );

      logger.info(`Added wallet to DAIS ${daisId}: ${walletAddress}`);
      return result.rows[0];
    } catch (error) {
      logger.error(`Failed to add wallet to DAIS: ${daisId}`, error);
      throw error;
    }
  }

  /**
   * Verify wallet (after SIWE signature)
   */
  async verifyWallet(daisId: string, walletAddress: string): Promise<void> {
    try {
      await db.query(
        `UPDATE dais_wallets 
         SET verified = true, verified_at = now()
         WHERE dais_id = $1 AND wallet_address = $2`,
        [daisId, walletAddress]
      );

      // Update trust level
      await this.updateTrustLevel(daisId);

      logger.info(`Verified wallet for DAIS ${daisId}: ${walletAddress}`);
    } catch (error) {
      logger.error(`Failed to verify wallet: ${daisId}`, error);
      throw error;
    }
  }

  /**
   * Update trust level based on verified identities
   */
  private async updateTrustLevel(daisId: string): Promise<void> {
    const profile = await this.getProfile(daisId);
    if (!profile) return;

    const hasVerifiedEmail = profile.emails.some(e => e.verified);
    const hasVerifiedWallet = profile.wallets.some(w => w.verified);

    let newLevel: DaisTrustLevel = 'guest';

    if (hasVerifiedEmail && hasVerifiedWallet) {
      newLevel = 'verified';
    } else if (hasVerifiedEmail) {
      newLevel = 'agent';
    }

    await db.query(
      `UPDATE dais_identities SET trust_level = $1, updated_at = now() WHERE id = $2`,
      [newLevel, daisId]
    );
  }

  /**
   * Promote agent to orchestrator (updates DAIS trust level)
   */
  async promoteToOrchestrator(daisId: string): Promise<void> {
    try {
      await db.query(
        `UPDATE dais_identities 
         SET trust_level = 'orchestrator', updated_at = now()
         WHERE id = $1`,
        [daisId]
      );

      logger.info(`Promoted DAIS to orchestrator: ${daisId}`);
    } catch (error) {
      logger.error(`Failed to promote to orchestrator: ${daisId}`, error);
      throw error;
    }
  }
}

export const daisService = new DaisService();