/**
 * SQLite-based Certificate Manager for SmartACME
 *
 * Implements ICertManager interface to store SSL certificates in SQLite database
 * and write PEM files to filesystem for use by the reverse proxy.
 */

import * as plugins from '../plugins.ts';
import { logger } from '../logging.ts';
import { getErrorMessage } from '../utils/error.ts';
import { OneboxDatabase } from './database.ts';

export class SqliteCertManager implements plugins.smartacme.ICertManager {
  private database: OneboxDatabase;
  private certBasePath: string;

  constructor(database: OneboxDatabase, certBasePath = './.nogit/ssl/live') {
    this.database = database;
    this.certBasePath = certBasePath;
  }

  /**
   * Initialize the certificate manager
   */
  async init(): Promise<void> {
    try {
      // Ensure certificate directory exists
      await Deno.mkdir(this.certBasePath, { recursive: true });
      logger.info(`Certificate manager initialized (path: ${this.certBasePath})`);
    } catch (error) {
      logger.error(`Failed to initialize certificate manager: ${getErrorMessage(error)}`);
      throw error;
    }
  }

  /**
   * Retrieve a certificate by domain name
   */
  async retrieveCertificate(domainName: string): Promise<plugins.smartacme.Cert | null> {
    try {
      const dbCert = this.database.getSSLCertificate(domainName);

      if (!dbCert) {
        return null;
      }

      // Convert database format to SmartacmeCert format
      const cert = new plugins.smartacme.Cert({
        id: dbCert.id?.toString() || domainName,
        domainName: dbCert.domain,
        created: dbCert.createdAt,
        privateKey: await this.readPemFile(dbCert.keyPath),
        publicKey: await this.readPemFile(dbCert.fullChainPath), // Full chain as public key
        csr: '', // CSR not stored separately
        validUntil: dbCert.expiryDate,
      });

      return cert;
    } catch (error) {
      logger.warn(`Failed to retrieve certificate for ${domainName}: ${getErrorMessage(error)}`);
      return null;
    }
  }

  /**
   * Store a certificate
   */
  async storeCertificate(cert: plugins.smartacme.Cert): Promise<void> {
    try {
      const domain = cert.domainName;
      const domainPath = `${this.certBasePath}/${domain}`;

      // Create domain-specific directory
      await Deno.mkdir(domainPath, { recursive: true });

      // Write PEM files
      const keyPath = `${domainPath}/privkey.pem`;
      const certPath = `${domainPath}/cert.pem`;
      const fullChainPath = `${domainPath}/fullchain.pem`;

      await Deno.writeTextFile(keyPath, cert.privateKey);
      await Deno.writeTextFile(fullChainPath, cert.publicKey);

      // Extract certificate from full chain (first certificate in the chain)
      const certOnly = this.extractCertFromChain(cert.publicKey);
      await Deno.writeTextFile(certPath, certOnly);

      // Store/update in database
      const existing = this.database.getSSLCertificate(domain);

      if (existing) {
        this.database.updateSSLCertificate(domain, {
          certPath,
          keyPath,
          fullChainPath,
          expiryDate: cert.validUntil,
          updatedAt: Date.now(),
        });
      } else {
        await this.database.createSSLCertificate({
          domain,
          certPath,
          keyPath,
          fullChainPath,
          expiryDate: cert.validUntil,
          issuer: 'Let\'s Encrypt',
          createdAt: cert.created,
          updatedAt: Date.now(),
        });
      }

      logger.success(`Certificate stored for ${domain}`);
    } catch (error) {
      logger.error(`Failed to store certificate for ${cert.domainName}: ${getErrorMessage(error)}`);
      throw error;
    }
  }

  /**
   * Delete a certificate
   */
  async deleteCertificate(domainName: string): Promise<void> {
    try {
      const dbCert = this.database.getSSLCertificate(domainName);

      if (dbCert) {
        // Delete PEM files
        const domainPath = `${this.certBasePath}/${domainName}`;
        try {
          await Deno.remove(domainPath, { recursive: true });
        } catch (error) {
          logger.warn(`Failed to delete PEM files for ${domainName}: ${getErrorMessage(error)}`);
        }

        // Delete from database
        this.database.deleteSSLCertificate(domainName);

        logger.info(`Certificate deleted for ${domainName}`);
      }
    } catch (error) {
      logger.error(`Failed to delete certificate for ${domainName}: ${getErrorMessage(error)}`);
      throw error;
    }
  }

  /**
   * Close the certificate manager
   */
  async close(): Promise<void> {
    // SQLite database is managed by OneboxDatabase, nothing to close here
    logger.info('Certificate manager closed');
  }

  /**
   * Wipe all certificates (for testing)
   */
  async wipe(): Promise<void> {
    try {
      const certs = this.database.getAllSSLCertificates();

      for (const cert of certs) {
        await this.deleteCertificate(cert.domain);
      }

      logger.warn('All certificates wiped');
    } catch (error) {
      logger.error(`Failed to wipe certificates: ${getErrorMessage(error)}`);
      throw error;
    }
  }

  /**
   * Read PEM file from filesystem
   */
  private async readPemFile(path: string): Promise<string> {
    try {
      return await Deno.readTextFile(path);
    } catch (error) {
      throw new Error(`Failed to read PEM file ${path}: ${getErrorMessage(error)}`);
    }
  }

  /**
   * Extract the first certificate from a PEM chain
   */
  private extractCertFromChain(fullChain: string): string {
    const certMatch = fullChain.match(/-----BEGIN CERTIFICATE-----[\s\S]+?-----END CERTIFICATE-----/);
    return certMatch ? certMatch[0] : fullChain;
  }
}