#!/usr/bin/env python3
"""
Structured logging for email worker with Daily Rotation
"""

import os
import sys
import logging
import threading
from logging.handlers import TimedRotatingFileHandler
from datetime import datetime

# Konfiguration
LOG_DIR = "/var/log/email-worker"
LOG_FILE = os.path.join(LOG_DIR, "worker.log")

# Logger initialisieren
logger = logging.getLogger("unified-worker")
logger.setLevel(logging.INFO)
logger.propagate = False

# Formatierung definieren: [Timestamp] [Level] [Thread] Nachricht
# Hinweis: worker_name wird in der Funktion 'log' manuell eingefügt
formatter = logging.Formatter(
    '[%(asctime)s] [%(levelname)s] [%(threadName)s] %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S'
)

# 1. Console Handler (damit 'docker logs' weiterhin etwas anzeigt)
console_handler = logging.StreamHandler(sys.stdout)
console_handler.setFormatter(formatter)
logger.addHandler(console_handler)

# 2. File Handler mit täglicher Rotation
# Prüfen, ob das Verzeichnis schreibbar ist (durch Docker Volume Mount)
if os.path.exists(LOG_DIR):
    try:
        # when="midnight": Rotiert jede Nacht um 00:00 Uhr
        # backupCount=30: Behält Logs für 30 Tage
        file_handler = TimedRotatingFileHandler(
            LOG_FILE, 
            when="midnight", 
            interval=1, 
            backupCount=30, 
            encoding='utf-8'
        )
        file_handler.setFormatter(formatter)
        # Suffix für rotierte Dateien: worker.log.2023-10-27
        file_handler.suffix = "%Y-%m-%d"
        logger.addHandler(file_handler)
    except Exception as e:
        print(f"⚠ Logging Setup Error: Could not create file handler: {e}")

def log(message: str, level: str = 'INFO', worker_name: str = 'unified-worker'):
    """
    Structured logging with timestamp and thread info.
    Drop-In Replacement for original print-based logging.
    """
    # Mapping von String-Levels zu logging Konstanten
    lvl_map = {
        'DEBUG': logging.DEBUG,
        'INFO': logging.INFO,
        'WARNING': logging.WARNING,
        'ERROR': logging.ERROR,
        'CRITICAL': logging.CRITICAL,
        'SUCCESS': logging.INFO  # 'SUCCESS' gibt es im Standard nicht, wir nutzen INFO
    }
    
    log_level = lvl_map.get(level.upper(), logging.INFO)
    
    # Prefix für SUCCESS Level manuell hinzufügen, da es im Standard-Logging fehlt
    prefix = ""
    if level.upper() == 'SUCCESS':
        prefix = "[SUCCESS] "
    
    # Den worker_name in die Nachricht integrieren
    final_message = f"[{worker_name}] {prefix}{message}"
    
    logger.log(log_level, final_message)