/**
 * Centralized Debug Logger
 * Captures console logs, errors, warnings for display in Debug tab
 */

export interface LogEntry {
  id: string;
  timestamp: Date;
  level: 'log' | 'warn' | 'error' | 'info';
  category: string; // e.g., "TTS", "STT", "Chat", "System"
  message: string;
  data?: any;
}

class DebugLogger {
  private logs: LogEntry[] = [];
  private maxLogs = 500; // Keep last 500 logs
  private listeners: Set<(logs: LogEntry[]) => void> = new Set();

  // Original console methods
  private originalConsole = {
    log: console.log.bind(console),
    warn: console.warn.bind(console),
    error: console.error.bind(console),
    info: console.info.bind(console),
  };

  constructor() {
    this.interceptConsole();
  }

  /**
   * Intercept console methods to capture logs
   */
  private interceptConsole() {
    console.log = (...args: any[]) => {
      this.originalConsole.log(...args);
      this.addLog('log', 'System', this.formatArgs(args));
    };

    console.warn = (...args: any[]) => {
      this.originalConsole.warn(...args);
      this.addLog('warn', 'System', this.formatArgs(args));
    };

    console.error = (...args: any[]) => {
      this.originalConsole.error(...args);
      this.addLog('error', 'System', this.formatArgs(args));
    };

    console.info = (...args: any[]) => {
      this.originalConsole.info(...args);
      this.addLog('info', 'System', this.formatArgs(args));
    };
  }

  /**
   * Format console arguments into string
   */
  private formatArgs(args: any[]): string {
    return args
      .map(arg => {
        if (typeof arg === 'object') {
          try {
            return JSON.stringify(arg, null, 2);
          } catch {
            return String(arg);
          }
        }
        return String(arg);
      })
      .join(' ');
  }

  /**
   * Add a log entry
   */
  private addLog(level: LogEntry['level'], category: string, message: string, data?: any) {
    const entry: LogEntry = {
      id: `${Date.now()}-${Math.random()}`,
      timestamp: new Date(),
      level,
      category,
      message,
      data,
    };

    this.logs.push(entry);

    // Trim old logs
    if (this.logs.length > this.maxLogs) {
      this.logs = this.logs.slice(-this.maxLogs);
    }

    // Notify listeners
    this.notifyListeners();
  }

  /**
   * Public logging methods with category support
   */
  log(category: string, message: string, data?: any) {
    this.originalConsole.log(`[${category}]`, message, data || '');
    this.addLog('log', category, message, data);
  }

  warn(category: string, message: string, data?: any) {
    this.originalConsole.warn(`[${category}]`, message, data || '');
    this.addLog('warn', category, message, data);
  }

  error(category: string, message: string, data?: any) {
    this.originalConsole.error(`[${category}]`, message, data || '');
    this.addLog('error', category, message, data);
  }

  info(category: string, message: string, data?: any) {
    this.originalConsole.info(`[${category}]`, message, data || '');
    this.addLog('info', category, message, data);
  }

  /**
   * Get all logs
   */
  getLogs(): LogEntry[] {
    return [...this.logs];
  }

  /**
   * Get logs by category
   */
  getLogsByCategory(category: string): LogEntry[] {
    return this.logs.filter(log => log.category === category);
  }

  /**
   * Clear all logs
   */
  clear() {
    this.logs = [];
    this.notifyListeners();
  }

  /**
   * Subscribe to log updates
   */
  subscribe(listener: (logs: LogEntry[]) => void) {
    this.listeners.add(listener);
    return () => this.listeners.delete(listener);
  }

  /**
   * Notify all listeners
   */
  private notifyListeners() {
    this.listeners.forEach(listener => listener(this.getLogs()));
  }

  /**
   * Export logs as text
   */
  exportAsText(): string {
    return this.logs
      .map(log => {
        const time = log.timestamp.toLocaleTimeString();
        const level = log.level.toUpperCase().padEnd(5);
        const category = `[${log.category}]`.padEnd(12);
        return `${time} ${level} ${category} ${log.message}`;
      })
      .join('\n');
  }
}

// Singleton instance
export const debugLogger = new DebugLogger();