import type { LoggerOptions } from 'pino';

export const getLogLevel = (): string => {
  return process.env.LOG_LEVEL || (process.env.NODE_ENV === 'production' ? 'info' : 'debug');
};

export const getPinoConfig = (): LoggerOptions => {
  const isDevelopment = process.env.NODE_ENV !== 'production';
  
  const baseConfig: LoggerOptions = {
    level: getLogLevel(),
    formatters: {
      level: (label) => {
        return { level: label.toUpperCase() };
      },
    },
    timestamp: () => `,"timestamp":"${new Date(Date.now()).toISOString()}"`,
    redact: {
      paths: [
        // Top-level sensitive fields
        'password',
        'token',
        'secret',
        'api_key',
        'apiKey',
        'authorization',
        'cookie',
        'HandshakeKey',
        'receivedSecret',
        'access_token',
        'refresh_token',
        'zammadCsrfToken',
        'clientSecret',
        // Nested sensitive fields (one level)
        '*.password',
        '*.token',
        '*.secret',
        '*.api_key',
        '*.apiKey',
        '*.authorization',
        '*.cookie',
        '*.access_token',
        '*.refresh_token',
        '*.zammadCsrfToken',
        '*.HandshakeKey',
        '*.receivedSecret',
        '*.clientSecret',
        // Common nested patterns
        'payload.HandshakeKey',
        'headers.authorization',
        'headers.cookie',
        'headers.Authorization',
        'headers.Cookie',
        'credentials.password',
        'credentials.secret',
        'credentials.token',
      ],
      censor: '[REDACTED]',
    },
  };

  if (isDevelopment) {
    // In development, use pretty printing for better readability
    return {
      ...baseConfig,
      transport: {
        target: 'pino-pretty',
        options: {
          colorize: true,
          translateTime: 'SYS:standard',
          ignore: 'pid,hostname',
          singleLine: false,
          messageFormat: '{msg}',
        },
      },
    };
  }

  // In production, use JSON for structured logging
  return baseConfig;
};