import * as plugins from './plugins.js';
import * as paths from './paths.js';
import { SmtpPortConfig, type ISmtpPortSettings } from './classes.smtp.portconfig.js';

// Certificate types are available via plugins.tsclass

// Import the consolidated email config
import type { IEmailConfig, IDomainRule } from './mail/routing/classes.email.config.js';
import { DomainRouter } from './mail/routing/classes.domain.router.js';
import { UnifiedEmailServer } from './mail/routing/classes.unified.email.server.js';
import { UnifiedDeliveryQueue, type IQueueOptions } from './mail/delivery/classes.delivery.queue.js';
import { MultiModeDeliverySystem, type IMultiModeDeliveryOptions } from './mail/delivery/classes.delivery.system.js';
import { UnifiedRateLimiter, type IHierarchicalRateLimits } from './mail/delivery/classes.unified.rate.limiter.js';
import { logger } from './logger.js';

export interface IDcRouterOptions {
  /** 
   * Direct SmartProxy configuration - gives full control over HTTP/HTTPS and TCP/SNI traffic
   * This is the preferred way to configure HTTP/HTTPS and general TCP/SNI traffic 
   */
  smartProxyConfig?: plugins.smartproxy.ISmartProxyOptions;
  
  /**
   * Consolidated email configuration
   * This enables all email handling with pattern-based routing
   */
  emailConfig?: IEmailConfig;
  
  /** TLS/certificate configuration */
  tls?: {
    /** Contact email for ACME certificates */
    contactEmail: string;
    /** Domain for main certificate */
    domain?: string;
    /** Path to certificate file (if not using auto-provisioning) */
    certPath?: string;
    /** Path to key file (if not using auto-provisioning) */
    keyPath?: string;
  };
  
  /** DNS server configuration */
  dnsServerConfig?: plugins.smartdns.IDnsServerOptions;
}

/**
 * DcRouter can be run on ingress and egress to and from a datacenter site.
 */
/**
 * Context passed to HTTP routing rules
 */
/**
 * Context passed to port proxy (SmartProxy) routing rules
 */
export interface PortProxyRuleContext {
  proxy: plugins.smartproxy.SmartProxy;
  configs: plugins.smartproxy.IPortProxySettings['domainConfigs'];
}

export class DcRouter {
  public options: IDcRouterOptions;
  
  // Core services
  public smartProxy?: plugins.smartproxy.SmartProxy;
  public dnsServer?: plugins.smartdns.DnsServer;
  
  // Unified email components
  public domainRouter?: DomainRouter;
  public unifiedEmailServer?: UnifiedEmailServer;
  public deliveryQueue?: UnifiedDeliveryQueue;
  public deliverySystem?: MultiModeDeliverySystem;
  public rateLimiter?: UnifiedRateLimiter;
  
  // Environment access 
  private qenv = new plugins.qenv.Qenv('./', '.nogit/');
  
  constructor(optionsArg: IDcRouterOptions) {
    // Set defaults in options
    this.options = {
      ...optionsArg
    };
  }

  public async start() {
    console.log('Starting DcRouter services...');
    
    try {
      // Set up SmartProxy for HTTP/HTTPS and general TCP/SNI traffic
      if (this.options.smartProxyConfig) {
        await this.setupSmartProxy();
      }
      
      // Set up unified email handling if configured
      if (this.options.emailConfig) {
        await this.setupUnifiedEmailHandling();
      }
      
      // 3. Set up DNS server if configured
      if (this.options.dnsServerConfig) {
        this.dnsServer = new plugins.smartdns.DnsServer(this.options.dnsServerConfig);
        await this.dnsServer.start();
        console.log('DNS server started');
      }
      
      console.log('DcRouter started successfully');
    } catch (error) {
      console.error('Error starting DcRouter:', error);
      // Try to clean up any services that may have started
      await this.stop();
      throw error;
    }
  }
  
  /**
   * Set up SmartProxy with direct configuration
   */
  private async setupSmartProxy(): Promise<void> {
    if (!this.options.smartProxyConfig) {
      return;
    }
    
    console.log('Setting up SmartProxy with direct configuration');
    
    // Create SmartProxy instance with full configuration
    this.smartProxy = new plugins.smartproxy.SmartProxy(this.options.smartProxyConfig);
    
    // Set up event listeners
    this.smartProxy.on('error', (err) => {
      console.error('SmartProxy error:', err);
    });
    
    if (this.options.smartProxyConfig.acme) {
      this.smartProxy.on('certificate-issued', (event) => {
        console.log(`Certificate issued for ${event.domain}, expires ${event.expiryDate}`);
      });
      
      this.smartProxy.on('certificate-renewed', (event) => {
        console.log(`Certificate renewed for ${event.domain}, expires ${event.expiryDate}`);
      });
    }
    
    // Start SmartProxy
    await this.smartProxy.start();
    
    console.log('SmartProxy started successfully');
  }
  
  

  /**
   * Check if a domain matches a pattern (including wildcard support)
   * @param domain The domain to check
   * @param pattern The pattern to match against (e.g., "*.example.com")
   * @returns Whether the domain matches the pattern
   */
  private isDomainMatch(domain: string, pattern: string): boolean {
    // Normalize inputs
    domain = domain.toLowerCase();
    pattern = pattern.toLowerCase();
    
    // Check for exact match
    if (domain === pattern) {
      return true;
    }
    
    // Check for wildcard match (*.example.com)
    if (pattern.startsWith('*.')) {
      const patternSuffix = pattern.slice(2); // Remove the "*." prefix
      
      // Check if domain ends with the pattern suffix and has at least one character before it
      return domain.endsWith(patternSuffix) && domain.length > patternSuffix.length;
    }
    
    // No match
    return false;
  }

  public async stop() {
    console.log('Stopping DcRouter services...');
    
    try {
      // Stop all services in parallel for faster shutdown
      await Promise.all([
        // Stop unified email components if running
        this.domainRouter ? this.stopUnifiedEmailComponents().catch(err => console.error('Error stopping unified email components:', err)) : Promise.resolve(),
        
        // Stop HTTP SmartProxy if running
        this.smartProxy ? this.smartProxy.stop().catch(err => console.error('Error stopping SmartProxy:', err)) : Promise.resolve(),
        
        // Stop DNS server if running
        this.dnsServer ? 
          this.dnsServer.stop().catch(err => console.error('Error stopping DNS server:', err)) : 
          Promise.resolve()
      ]);
      
      console.log('All DcRouter services stopped');
    } catch (error) {
      console.error('Error during DcRouter shutdown:', error);
      throw error;
    }
  }

  /**
   * Update SmartProxy configuration
   * @param config New SmartProxy configuration
   */
  public async updateSmartProxyConfig(config: plugins.smartproxy.ISmartProxyOptions): Promise<void> {
    // Stop existing SmartProxy if running
    if (this.smartProxy) {
      await this.smartProxy.stop();
      this.smartProxy = undefined;
    }
    
    // Update configuration
    this.options.smartProxyConfig = config;
    
    // Start new SmartProxy with updated configuration
    await this.setupSmartProxy();
    
    console.log('SmartProxy configuration updated');
  }
  
  
  
  /**
   * Set up unified email handling with pattern-based routing
   * This implements the consolidated emailConfig approach
   */
  private async setupUnifiedEmailHandling(): Promise<void> {
    logger.log('info', 'Setting up unified email handling with pattern-based routing');
    
    if (!this.options.emailConfig) {
      throw new Error('Email configuration is required for unified email handling');
    }
    
    try {
      // Create domain router for pattern matching
      this.domainRouter = new DomainRouter({
        domainRules: this.options.emailConfig.domainRules,
        defaultMode: this.options.emailConfig.defaultMode,
        defaultServer: this.options.emailConfig.defaultServer,
        defaultPort: this.options.emailConfig.defaultPort,
        defaultTls: this.options.emailConfig.defaultTls
      });
      
      // Initialize the rate limiter
      this.rateLimiter = new UnifiedRateLimiter({
        global: {
          maxMessagesPerMinute: 100,
          maxRecipientsPerMessage: 100,
          maxConnectionsPerIP: 20,
          maxErrorsPerIP: 10,
          maxAuthFailuresPerIP: 5
        }
      });
      
      // Initialize the unified delivery queue
      const queueOptions: IQueueOptions = {
        storageType: this.options.emailConfig.queue?.storageType || 'memory',
        persistentPath: this.options.emailConfig.queue?.persistentPath,
        maxRetries: this.options.emailConfig.queue?.maxRetries,
        baseRetryDelay: this.options.emailConfig.queue?.baseRetryDelay,
        maxRetryDelay: this.options.emailConfig.queue?.maxRetryDelay
      };
      
      this.deliveryQueue = new UnifiedDeliveryQueue(queueOptions);
      await this.deliveryQueue.initialize();
      
      // Initialize the delivery system
      const deliveryOptions: IMultiModeDeliveryOptions = {
        globalRateLimit: 100, // Default to 100 emails per minute
        concurrentDeliveries: 10
      };
      
      this.deliverySystem = new MultiModeDeliverySystem(this.deliveryQueue, deliveryOptions);
      await this.deliverySystem.start();
      
      // Initialize the unified email server
      this.unifiedEmailServer = new UnifiedEmailServer({
        ports: this.options.emailConfig.ports,
        hostname: this.options.emailConfig.hostname,
        maxMessageSize: this.options.emailConfig.maxMessageSize,
        auth: this.options.emailConfig.auth,
        tls: this.options.emailConfig.tls,
        domainRules: this.options.emailConfig.domainRules,
        defaultMode: this.options.emailConfig.defaultMode,
        defaultServer: this.options.emailConfig.defaultServer,
        defaultPort: this.options.emailConfig.defaultPort,
        defaultTls: this.options.emailConfig.defaultTls
      });
      
      // Set up event listeners
      this.unifiedEmailServer.on('error', (err) => {
        logger.log('error', `UnifiedEmailServer error: ${err.message}`);
      });
      
      // Connect the unified email server with the delivery queue
      this.unifiedEmailServer.on('emailProcessed', (email, mode, rule) => {
        this.deliveryQueue!.enqueue(email, mode, rule).catch(err => {
          logger.log('error', `Failed to enqueue email: ${err.message}`);
        });
      });
      
      // Start the unified email server
      await this.unifiedEmailServer.start();
      
      logger.log('info', `Unified email handling configured with ${this.options.emailConfig.domainRules.length} domain rules`);
    } catch (error) {
      logger.log('error', `Error setting up unified email handling: ${error.message}`);
      throw error;
    }
  }
  
  /**
   * Update the unified email configuration
   * @param config New email configuration
   */
  public async updateEmailConfig(config: IEmailConfig): Promise<void> {
    // Stop existing email components
    await this.stopUnifiedEmailComponents();
    
    // Update configuration
    this.options.emailConfig = config;
    
    // Start email handling with new configuration
    await this.setupUnifiedEmailHandling();
    
    console.log('Unified email configuration updated');
  }
  
  /**
   * Stop all unified email components
   */
  private async stopUnifiedEmailComponents(): Promise<void> {
    try {
      // Stop all components in the correct order
      
      // 1. Stop the unified email server first
      if (this.unifiedEmailServer) {
        await this.unifiedEmailServer.stop();
        logger.log('info', 'Unified email server stopped');
        this.unifiedEmailServer = undefined;
      }
      
      // 2. Stop the delivery system
      if (this.deliverySystem) {
        await this.deliverySystem.stop();
        logger.log('info', 'Delivery system stopped');
        this.deliverySystem = undefined;
      }
      
      // 3. Stop the delivery queue
      if (this.deliveryQueue) {
        await this.deliveryQueue.shutdown();
        logger.log('info', 'Delivery queue shut down');
        this.deliveryQueue = undefined;
      }
      
      // 4. Stop the rate limiter
      if (this.rateLimiter) {
        this.rateLimiter.stop();
        logger.log('info', 'Rate limiter stopped');
        this.rateLimiter = undefined;
      }
      
      // 5. Clear the domain router
      this.domainRouter = undefined;
      
      logger.log('info', 'All unified email components stopped');
    } catch (error) {
      logger.log('error', `Error stopping unified email components: ${error.message}`);
      throw error;
    }
  }
  
  /**
   * Update domain rules for email routing
   * @param rules New domain rules to apply
   */
  public async updateDomainRules(rules: IDomainRule[]): Promise<void> {
    // Validate that email config exists
    if (!this.options.emailConfig) {
      throw new Error('Email configuration is required before updating domain rules');
    }
    
    // Update the configuration
    this.options.emailConfig.domainRules = rules;
    
    // Update the domain router if it exists
    if (this.domainRouter) {
      this.domainRouter.updateRules(rules);
    }
    
    // Update the unified email server if it exists
    if (this.unifiedEmailServer) {
      this.unifiedEmailServer.updateDomainRules(rules);
    }
    
    console.log(`Domain rules updated with ${rules.length} rules`);
  }
  
  /**
   * Get statistics from all components
   */
  public getStats(): any {
    const stats: any = {
      unifiedEmailServer: this.unifiedEmailServer?.getStats(),
      deliveryQueue: this.deliveryQueue?.getStats(),
      deliverySystem: this.deliverySystem?.getStats(),
      rateLimiter: this.rateLimiter?.getStats()
    };
    
    return stats;
  }
}

export default DcRouter;