import * as plugins from '../../plugins.js';
import type { OpsServer } from '../classes.opsserver.js';
import * as interfaces from '../../../ts_interfaces/index.js';

export class LogsHandler {
  public typedrouter = new plugins.typedrequest.TypedRouter();
  
  constructor(private opsServerRef: OpsServer) {
    // Add this handler's router to the parent
    this.opsServerRef.typedrouter.addTypedRouter(this.typedrouter);
    this.registerHandlers();
  }
  
  private registerHandlers(): void {
    // Get Recent Logs Handler
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetRecentLogs>(
        'getRecentLogs',
        async (dataArg, toolsArg) => {
          const logs = await this.getRecentLogs(
            dataArg.level,
            dataArg.category,
            dataArg.limit || 100,
            dataArg.offset || 0,
            dataArg.search,
            dataArg.timeRange
          );
          
          return {
            logs,
            total: logs.length, // TODO: Implement proper total count
            hasMore: false, // TODO: Implement proper pagination
          };
        }
      )
    );
    
    // Get Log Stream Handler
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetLogStream>(
        'getLogStream',
        async (dataArg, toolsArg) => {
          // Create a virtual stream for log streaming
          const virtualStream = new plugins.typedrequest.VirtualStream<Uint8Array>();
          
          // Set up log streaming
          const streamLogs = this.setupLogStream(
            virtualStream,
            dataArg.filters?.level,
            dataArg.filters?.category,
            dataArg.follow
          );
          
          // Start streaming
          streamLogs.start();
          
          // VirtualStream handles cleanup automatically
          
          return {
            logStream: virtualStream as any, // Cast to IVirtualStream interface
          };
        }
      )
    );
  }
  
  private async getRecentLogs(
    level?: 'error' | 'warn' | 'info' | 'debug',
    category?: 'smtp' | 'dns' | 'security' | 'system' | 'email',
    limit: number = 100,
    offset: number = 0,
    search?: string,
    timeRange?: '1h' | '6h' | '24h' | '7d' | '30d'
  ): Promise<Array<{
    timestamp: number;
    level: 'debug' | 'info' | 'warn' | 'error';
    category: 'smtp' | 'dns' | 'security' | 'system' | 'email';
    message: string;
    metadata?: any;
  }>> {
    // TODO: Implement actual log retrieval from storage or logger
    // For now, return mock data
    const mockLogs: Array<{
      timestamp: number;
      level: 'debug' | 'info' | 'warn' | 'error';
      category: 'smtp' | 'dns' | 'security' | 'system' | 'email';
      message: string;
      metadata?: any;
    }> = [];
    
    const categories: Array<'smtp' | 'dns' | 'security' | 'system' | 'email'> = ['smtp', 'dns', 'security', 'system', 'email'];
    const levels: Array<'debug' | 'info' | 'warn' | 'error'> = ['info', 'warn', 'error', 'debug'];
    const now = Date.now();
    
    // Generate some mock log entries
    for (let i = 0; i < 50; i++) {
      const mockCategory = categories[Math.floor(Math.random() * categories.length)];
      const mockLevel = levels[Math.floor(Math.random() * levels.length)];
      
      // Filter by requested criteria
      if (level && mockLevel !== level) continue;
      if (category && mockCategory !== category) continue;
      
      mockLogs.push({
        timestamp: now - (i * 60000), // 1 minute apart
        level: mockLevel,
        category: mockCategory,
        message: `Sample log message ${i} from ${mockCategory}`,
        metadata: {
          requestId: plugins.uuid.v4(),
        },
      });
    }
    
    // Apply pagination
    return mockLogs.slice(offset, offset + limit);
  }
  
  private setupLogStream(
    virtualStream: plugins.typedrequest.VirtualStream<Uint8Array>,
    levelFilter?: string[],
    categoryFilter?: string[],
    follow: boolean = true
  ): {
    start: () => void;
    stop: () => void;
  } {
    let intervalId: NodeJS.Timeout | null = null;
    let logIndex = 0;
    
    const start = () => {
      if (!follow) {
        // Send existing logs and close
        this.getRecentLogs(
          levelFilter?.[0] as any,
          categoryFilter?.[0] as any,
          100,
          0
        ).then(logs => {
          logs.forEach(log => {
            const logData = JSON.stringify(log);
            const encoder = new TextEncoder();
            virtualStream.sendData(encoder.encode(logData));
          });
          // VirtualStream doesn't have end() method - it closes automatically
        });
        return;
      }
      
      // For follow mode, simulate real-time log streaming
      intervalId = setInterval(() => {
        const categories: Array<'smtp' | 'dns' | 'security' | 'system' | 'email'> = ['smtp', 'dns', 'security', 'system', 'email'];
        const levels: Array<'debug' | 'info' | 'warn' | 'error'> = ['info', 'warn', 'error', 'debug'];
        
        const mockCategory = categories[Math.floor(Math.random() * categories.length)];
        const mockLevel = levels[Math.floor(Math.random() * levels.length)];
        
        // Filter by requested criteria
        if (levelFilter && !levelFilter.includes(mockLevel)) return;
        if (categoryFilter && !categoryFilter.includes(mockCategory)) return;
        
        const logEntry = {
          timestamp: Date.now(),
          level: mockLevel,
          category: mockCategory,
          message: `Real-time log ${logIndex++} from ${mockCategory}`,
          metadata: {
            requestId: plugins.uuid.v4(),
          },
        };
        
        const logData = JSON.stringify(logEntry);
        const encoder = new TextEncoder();
        virtualStream.sendData(encoder.encode(logData));
      }, 2000); // Send a log every 2 seconds
      
      // TODO: Hook into actual logger events
      // logger.on('log', (logEntry) => {
      //   if (matchesCriteria(logEntry, level, service)) {
      //     virtualStream.sendData(formatLogEntry(logEntry));
      //   }
      // });
    };
    
    const stop = () => {
      if (intervalId) {
        clearInterval(intervalId);
        intervalId = null;
      }
      // TODO: Unhook from logger events
    };
    
    return { start, stop };
  }
}