# mt_spider/logger.py
import os
import logging
from datetime import datetime
from pathlib import Path
from logging.handlers import TimedRotatingFileHandler

LOG_DIR = os.path.join(os.path.dirname(__file__), '..', 'logs')
os.makedirs(LOG_DIR, exist_ok=True)


def _build_daily_log_path(name: str) -> str:
    # 每天一个独立文件：pdd_new2_2026-04-24.log
    date_str = datetime.now().strftime("%Y-%m-%d")
    return str(Path(LOG_DIR, f"{name}_{date_str}.log").resolve())


def setup_logger(name: str = "pdd_spider"):
    logger = logging.getLogger()
    logger.setLevel(logging.INFO)
    fmt = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')
    target_file = _build_daily_log_path(name)

    # 控制台 handler 去重
    has_console = any(type(h) is logging.StreamHandler for h in logger.handlers)
    if not has_console:
        console = logging.StreamHandler()
        console.setFormatter(fmt)
        logger.addHandler(console)

    # 文件 handler 按“目标文件路径”去重
    has_target_file = False
    for handler in logger.handlers:
        if isinstance(handler, TimedRotatingFileHandler):
            base_filename = str(Path(getattr(handler, "baseFilename", "")).resolve())
            if base_filename == target_file:
                has_target_file = True
                break

    if not has_target_file:
        file_handler = TimedRotatingFileHandler(
            filename=target_file,
            when='midnight',
            interval=1,
            encoding='utf-8',
            backupCount=30
        )
        # 文件名已自带日期，这里保留 suffix 仅作兼容（通常不会触发）
        file_handler.suffix = "%Y-%m-%d"
        file_handler.setFormatter(fmt)
        logger.addHandler(file_handler)

    logger.propagate = False
    return logger