/**
 * Database layer for Onebox using SQLite
 */

import * as plugins from '../plugins.ts';
import type {
  IService,
  IRegistry,
  INginxConfig,
  ISslCertificate,
  IDnsRecord,
  IMetric,
  ILogEntry,
  IUser,
  ISetting,
} from '../types.ts';
import { logger } from '../logging.ts';

export class OneboxDatabase {
  private db: plugins.sqlite.DB | null = null;
  private dbPath: string;

  constructor(dbPath = './.nogit/onebox.db') {
    this.dbPath = dbPath;
  }

  /**
   * Initialize database connection and create tables
   */
  async init(): Promise<void> {
    try {
      // Ensure data directory exists
      const dbDir = plugins.path.dirname(this.dbPath);
      await Deno.mkdir(dbDir, { recursive: true });

      // Open database
      this.db = new plugins.sqlite.DB(this.dbPath);
      logger.info(`Database initialized at ${this.dbPath}`);

      // Create tables
      await this.createTables();

      // Run migrations if needed
      await this.runMigrations();
    } catch (error) {
      logger.error(`Failed to initialize database: ${error.message}`);
      throw error;
    }
  }

  /**
   * Create all database tables
   */
  private async createTables(): Promise<void> {
    if (!this.db) throw new Error('Database not initialized');

    // Services table
    this.query(`
      CREATE TABLE IF NOT EXISTS services (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        name TEXT NOT NULL UNIQUE,
        image TEXT NOT NULL,
        registry TEXT,
        env_vars TEXT NOT NULL,
        port INTEGER NOT NULL,
        domain TEXT,
        container_id TEXT,
        status TEXT NOT NULL DEFAULT 'stopped',
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
      )
    `);

    // Registries table
    this.query(`
      CREATE TABLE IF NOT EXISTS registries (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        url TEXT NOT NULL UNIQUE,
        username TEXT NOT NULL,
        password_encrypted TEXT NOT NULL,
        created_at INTEGER NOT NULL
      )
    `);

    // Nginx configs table
    this.query(`
      CREATE TABLE IF NOT EXISTS nginx_configs (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        service_id INTEGER NOT NULL,
        domain TEXT NOT NULL,
        port INTEGER NOT NULL,
        ssl_enabled INTEGER NOT NULL DEFAULT 0,
        config_template TEXT NOT NULL,
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL,
        FOREIGN KEY (service_id) REFERENCES services(id) ON DELETE CASCADE
      )
    `);

    // SSL certificates table
    this.query(`
      CREATE TABLE IF NOT EXISTS ssl_certificates (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        domain TEXT NOT NULL UNIQUE,
        cert_path TEXT NOT NULL,
        key_path TEXT NOT NULL,
        full_chain_path TEXT NOT NULL,
        expiry_date INTEGER NOT NULL,
        issuer TEXT NOT NULL,
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
      )
    `);

    // DNS records table
    this.query(`
      CREATE TABLE IF NOT EXISTS dns_records (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        domain TEXT NOT NULL UNIQUE,
        type TEXT NOT NULL,
        value TEXT NOT NULL,
        cloudflare_id TEXT,
        zone_id TEXT,
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
      )
    `);

    // Metrics table
    this.query(`
      CREATE TABLE IF NOT EXISTS metrics (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        service_id INTEGER NOT NULL,
        timestamp INTEGER NOT NULL,
        cpu_percent REAL NOT NULL,
        memory_used INTEGER NOT NULL,
        memory_limit INTEGER NOT NULL,
        network_rx_bytes INTEGER NOT NULL,
        network_tx_bytes INTEGER NOT NULL,
        FOREIGN KEY (service_id) REFERENCES services(id) ON DELETE CASCADE
      )
    `);

    // Create index for metrics queries
    this.query(`
      CREATE INDEX IF NOT EXISTS idx_metrics_service_timestamp
      ON metrics(service_id, timestamp DESC)
    `);

    // Logs table
    this.query(`
      CREATE TABLE IF NOT EXISTS logs (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        service_id INTEGER NOT NULL,
        timestamp INTEGER NOT NULL,
        message TEXT NOT NULL,
        level TEXT NOT NULL,
        source TEXT NOT NULL,
        FOREIGN KEY (service_id) REFERENCES services(id) ON DELETE CASCADE
      )
    `);

    // Create index for logs queries
    this.query(`
      CREATE INDEX IF NOT EXISTS idx_logs_service_timestamp
      ON logs(service_id, timestamp DESC)
    `);

    // Users table
    this.query(`
      CREATE TABLE IF NOT EXISTS users (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        username TEXT NOT NULL UNIQUE,
        password_hash TEXT NOT NULL,
        role TEXT NOT NULL DEFAULT 'user',
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
      )
    `);

    // Settings table
    this.query(`
      CREATE TABLE IF NOT EXISTS settings (
        key TEXT PRIMARY KEY,
        value TEXT NOT NULL,
        updated_at INTEGER NOT NULL
      )
    `);

    // Version table for migrations
    this.query(`
      CREATE TABLE IF NOT EXISTS migrations (
        version INTEGER PRIMARY KEY,
        applied_at INTEGER NOT NULL
      )
    `);

    logger.debug('Database tables created successfully');
  }

  /**
   * Run database migrations
   */
  private async runMigrations(): Promise<void> {
    if (!this.db) throw new Error('Database not initialized');

    const currentVersion = this.getMigrationVersion();
    logger.debug(`Current database version: ${currentVersion}`);

    // Add migration logic here as needed
    // For now, just set version to 1
    if (currentVersion === 0) {
      this.setMigrationVersion(1);
    }
  }

  /**
   * Get current migration version
   */
  private getMigrationVersion(): number {
    if (!this.db) throw new Error('Database not initialized');

    try {
      const result = this.query('SELECT MAX(version) as version FROM migrations');
      return result.length > 0 && result[0][0] !== null ? Number(result[0][0]) : 0;
    } catch {
      return 0;
    }
  }

  /**
   * Set migration version
   */
  private setMigrationVersion(version: number): void {
    if (!this.db) throw new Error('Database not initialized');

    this.query('INSERT INTO migrations (version, applied_at) VALUES (?, ?)', [
      version,
      Date.now(),
    ]);
    logger.debug(`Migration version set to ${version}`);
  }

  /**
   * Close database connection
   */
  close(): void {
    if (this.db) {
      this.db.close();
      this.db = null;
      logger.debug('Database connection closed');
    }
  }

  /**
   * Execute a raw query
   */
  query<T = unknown[]>(sql: string, params: unknown[] = []): T[] {
    if (!this.db) {
      const error = new Error('Database not initialized');
      console.error('Database access before initialization!');
      console.error('Stack trace:', error.stack);
      throw error;
    }

    // For queries without parameters, use exec for better performance
    if (params.length === 0 && !sql.trim().toUpperCase().startsWith('SELECT')) {
      this.db.exec(sql);
      return [] as T[];
    }

    // For SELECT queries or statements with parameters, use prepare().all()
    const stmt = this.db.prepare(sql);
    try {
      const result = stmt.all(...params);
      return result as T[];
    } finally {
      stmt.finalize();
    }
  }

  // ============ Services CRUD ============

  async createService(service: Omit<IService, 'id'>): Promise<IService> {
    if (!this.db) throw new Error('Database not initialized');

    const now = Date.now();
    this.query(
      `INSERT INTO services (name, image, registry, env_vars, port, domain, container_id, status, created_at, updated_at)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      [
        service.name,
        service.image,
        service.registry || null,
        JSON.stringify(service.envVars),
        service.port,
        service.domain || null,
        service.containerID || null,
        service.status,
        now,
        now,
      ]
    );

    return this.getServiceByName(service.name)!;
  }

  getServiceByName(name: string): IService | null {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT * FROM services WHERE name = ?', [name]);
    return rows.length > 0 ? this.rowToService(rows[0]) : null;
  }

  getServiceByID(id: number): IService | null {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT * FROM services WHERE id = ?', [id]);
    return rows.length > 0 ? this.rowToService(rows[0]) : null;
  }

  getAllServices(): IService[] {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT * FROM services ORDER BY created_at DESC');
    return rows.map((row) => this.rowToService(row));
  }

  updateService(id: number, updates: Partial<IService>): void {
    if (!this.db) throw new Error('Database not initialized');

    const fields: string[] = [];
    const values: unknown[] = [];

    if (updates.image !== undefined) {
      fields.push('image = ?');
      values.push(updates.image);
    }
    if (updates.registry !== undefined) {
      fields.push('registry = ?');
      values.push(updates.registry);
    }
    if (updates.envVars !== undefined) {
      fields.push('env_vars = ?');
      values.push(JSON.stringify(updates.envVars));
    }
    if (updates.port !== undefined) {
      fields.push('port = ?');
      values.push(updates.port);
    }
    if (updates.domain !== undefined) {
      fields.push('domain = ?');
      values.push(updates.domain);
    }
    if (updates.containerID !== undefined) {
      fields.push('container_id = ?');
      values.push(updates.containerID);
    }
    if (updates.status !== undefined) {
      fields.push('status = ?');
      values.push(updates.status);
    }

    fields.push('updated_at = ?');
    values.push(Date.now());
    values.push(id);

    this.query(`UPDATE services SET ${fields.join(', ')} WHERE id = ?`, values);
  }

  deleteService(id: number): void {
    if (!this.db) throw new Error('Database not initialized');
    this.query('DELETE FROM services WHERE id = ?', [id]);
  }

  private rowToService(row: any): IService {
    // Handle env_vars JSON parsing safely
    let envVars = {};
    const envVarsRaw = row.env_vars || row[4];
    if (envVarsRaw && envVarsRaw !== 'undefined' && envVarsRaw !== 'null') {
      try {
        envVars = JSON.parse(String(envVarsRaw));
      } catch (e) {
        logger.warn(`Failed to parse env_vars for service: ${e.message}`);
        envVars = {};
      }
    }

    return {
      id: Number(row.id || row[0]),
      name: String(row.name || row[1]),
      image: String(row.image || row[2]),
      registry: (row.registry || row[3]) ? String(row.registry || row[3]) : undefined,
      envVars,
      port: Number(row.port || row[5]),
      domain: (row.domain || row[6]) ? String(row.domain || row[6]) : undefined,
      containerID: (row.container_id || row[7]) ? String(row.container_id || row[7]) : undefined,
      status: String(row.status || row[8]) as IService['status'],
      createdAt: Number(row.created_at || row[9]),
      updatedAt: Number(row.updated_at || row[10]),
    };
  }

  // ============ Registries CRUD ============

  async createRegistry(registry: Omit<IRegistry, 'id'>): Promise<IRegistry> {
    if (!this.db) throw new Error('Database not initialized');

    const now = Date.now();
    this.query(
      'INSERT INTO registries (url, username, password_encrypted, created_at) VALUES (?, ?, ?, ?)',
      [registry.url, registry.username, registry.passwordEncrypted, now]
    );

    return this.getRegistryByURL(registry.url)!;
  }

  getRegistryByURL(url: string): IRegistry | null {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT * FROM registries WHERE url = ?', [url]);
    return rows.length > 0 ? this.rowToRegistry(rows[0]) : null;
  }

  getAllRegistries(): IRegistry[] {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT * FROM registries ORDER BY created_at DESC');
    return rows.map((row) => this.rowToRegistry(row));
  }

  deleteRegistry(url: string): void {
    if (!this.db) throw new Error('Database not initialized');
    this.query('DELETE FROM registries WHERE url = ?', [url]);
  }

  private rowToRegistry(row: any): IRegistry {
    return {
      id: Number(row.id || row[0]),
      url: String(row.url || row[1]),
      username: String(row.username || row[2]),
      passwordEncrypted: String(row.password_encrypted || row[3]),
      createdAt: Number(row.created_at || row[4]),
    };
  }

  // ============ Settings CRUD ============

  getSetting(key: string): string | null {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT value FROM settings WHERE key = ?', [key]);
    if (rows.length === 0) return null;

    // @db/sqlite returns rows as objects with column names as keys
    const value = (rows[0] as any).value || rows[0][0];
    return value ? String(value) : null;
  }

  setSetting(key: string, value: string): void {
    if (!this.db) throw new Error('Database not initialized');

    const now = Date.now();
    this.query(
      'INSERT OR REPLACE INTO settings (key, value, updated_at) VALUES (?, ?, ?)',
      [key, value, now]
    );
  }

  getAllSettings(): Record<string, string> {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT key, value FROM settings');
    const settings: Record<string, string> = {};
    for (const row of rows) {
      // @db/sqlite returns rows as objects with column names as keys
      const key = (row as any).key || row[0];
      const value = (row as any).value || row[1];
      settings[String(key)] = String(value);
    }
    return settings;
  }

  // ============ Users CRUD ============

  async createUser(user: Omit<IUser, 'id'>): Promise<IUser> {
    if (!this.db) throw new Error('Database not initialized');

    const now = Date.now();
    this.query(
      'INSERT INTO users (username, password_hash, role, created_at, updated_at) VALUES (?, ?, ?, ?, ?)',
      [user.username, user.passwordHash, user.role, now, now]
    );

    return this.getUserByUsername(user.username)!;
  }

  getUserByUsername(username: string): IUser | null {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT * FROM users WHERE username = ?', [username]);
    return rows.length > 0 ? this.rowToUser(rows[0]) : null;
  }

  getAllUsers(): IUser[] {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT * FROM users ORDER BY created_at DESC');
    return rows.map((row) => this.rowToUser(row));
  }

  updateUserPassword(username: string, passwordHash: string): void {
    if (!this.db) throw new Error('Database not initialized');
    this.query('UPDATE users SET password_hash = ?, updated_at = ? WHERE username = ?', [
      passwordHash,
      Date.now(),
      username,
    ]);
  }

  deleteUser(username: string): void {
    if (!this.db) throw new Error('Database not initialized');
    this.query('DELETE FROM users WHERE username = ?', [username]);
  }

  private rowToUser(row: any): IUser {
    return {
      id: Number(row.id || row[0]),
      username: String(row.username || row[1]),
      passwordHash: String(row.password_hash || row[2]),
      role: String(row.role || row[3]) as IUser['role'],
      createdAt: Number(row.created_at || row[4]),
      updatedAt: Number(row.updated_at || row[5]),
    };
  }

  // ============ Metrics ============

  addMetric(metric: Omit<IMetric, 'id'>): void {
    if (!this.db) throw new Error('Database not initialized');

    this.query(
      `INSERT INTO metrics (service_id, timestamp, cpu_percent, memory_used, memory_limit, network_rx_bytes, network_tx_bytes)
       VALUES (?, ?, ?, ?, ?, ?, ?)`,
      [
        metric.serviceId,
        metric.timestamp,
        metric.cpuPercent,
        metric.memoryUsed,
        metric.memoryLimit,
        metric.networkRxBytes,
        metric.networkTxBytes,
      ]
    );
  }

  getMetrics(serviceId: number, limit = 100): IMetric[] {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query(
      'SELECT * FROM metrics WHERE service_id = ? ORDER BY timestamp DESC LIMIT ?',
      [serviceId, limit]
    );
    return rows.map((row) => this.rowToMetric(row));
  }

  private rowToMetric(row: any): IMetric {
    return {
      id: Number(row.id || row[0]),
      serviceId: Number(row.service_id || row[1]),
      timestamp: Number(row.timestamp || row[2]),
      cpuPercent: Number(row.cpu_percent || row[3]),
      memoryUsed: Number(row.memory_used || row[4]),
      memoryLimit: Number(row.memory_limit || row[5]),
      networkRxBytes: Number(row.network_rx_bytes || row[6]),
      networkTxBytes: Number(row.network_tx_bytes || row[7]),
    };
  }

  // ============ Logs ============

  addLog(log: Omit<ILogEntry, 'id'>): void {
    if (!this.db) throw new Error('Database not initialized');

    this.query(
      'INSERT INTO logs (service_id, timestamp, message, level, source) VALUES (?, ?, ?, ?, ?)',
      [log.serviceId, log.timestamp, log.message, log.level, log.source]
    );
  }

  getLogs(serviceId: number, limit = 1000): ILogEntry[] {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query(
      'SELECT * FROM logs WHERE service_id = ? ORDER BY timestamp DESC LIMIT ?',
      [serviceId, limit]
    );
    return rows.map((row) => this.rowToLog(row));
  }

  private rowToLog(row: any): ILogEntry {
    return {
      id: Number(row.id || row[0]),
      serviceId: Number(row.service_id || row[1]),
      timestamp: Number(row.timestamp || row[2]),
      message: String(row.message || row[3]),
      level: String(row.level || row[4]) as ILogEntry['level'],
      source: String(row.source || row[5]) as ILogEntry['source'],
    };
  }

  // ============ SSL Certificates ============

  async createSSLCertificate(cert: Omit<ISslCertificate, 'id'>): Promise<ISslCertificate> {
    if (!this.db) throw new Error('Database not initialized');

    const now = Date.now();
    this.query(
      `INSERT INTO ssl_certificates (domain, cert_path, key_path, full_chain_path, expiry_date, issuer, created_at, updated_at)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
      [
        cert.domain,
        cert.certPath,
        cert.keyPath,
        cert.fullChainPath,
        cert.expiryDate,
        cert.issuer,
        now,
        now,
      ]
    );

    return this.getSSLCertificate(cert.domain)!;
  }

  getSSLCertificate(domain: string): ISslCertificate | null {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT * FROM ssl_certificates WHERE domain = ?', [domain]);
    return rows.length > 0 ? this.rowToSSLCert(rows[0]) : null;
  }

  getAllSSLCertificates(): ISslCertificate[] {
    if (!this.db) throw new Error('Database not initialized');

    const rows = this.query('SELECT * FROM ssl_certificates ORDER BY expiry_date ASC');
    return rows.map((row) => this.rowToSSLCert(row));
  }

  updateSSLCertificate(domain: string, updates: Partial<ISslCertificate>): void {
    if (!this.db) throw new Error('Database not initialized');

    const fields: string[] = [];
    const values: unknown[] = [];

    if (updates.certPath) {
      fields.push('cert_path = ?');
      values.push(updates.certPath);
    }
    if (updates.keyPath) {
      fields.push('key_path = ?');
      values.push(updates.keyPath);
    }
    if (updates.fullChainPath) {
      fields.push('full_chain_path = ?');
      values.push(updates.fullChainPath);
    }
    if (updates.expiryDate) {
      fields.push('expiry_date = ?');
      values.push(updates.expiryDate);
    }

    fields.push('updated_at = ?');
    values.push(Date.now());
    values.push(domain);

    this.query(`UPDATE ssl_certificates SET ${fields.join(', ')} WHERE domain = ?`, values);
  }

  deleteSSLCertificate(domain: string): void {
    if (!this.db) throw new Error('Database not initialized');
    this.query('DELETE FROM ssl_certificates WHERE domain = ?', [domain]);
  }

  private rowToSSLCert(row: any): ISslCertificate {
    return {
      id: Number(row.id || row[0]),
      domain: String(row.domain || row[1]),
      certPath: String(row.cert_path || row[2]),
      keyPath: String(row.key_path || row[3]),
      fullChainPath: String(row.full_chain_path || row[4]),
      expiryDate: Number(row.expiry_date || row[5]),
      issuer: String(row.issuer || row[6]),
      createdAt: Number(row.created_at || row[7]),
      updatedAt: Number(row.updated_at || row[8]),
    };
  }
}