import logging
from pathlib import Path
import json
from datetime import datetime, timedelta
import glob
import os


LOG_DIR = Path(__file__).resolve().parent / "logs"
LOG_DIR.mkdir(parents=True, exist_ok=True)


class DailyRotatingFileHandler(logging.Handler):
    """A simple daily rotating file handler that names files as {name}_YYYYMMDD.log

    It will open a new file when the date changes and optionally remove old log
    files older than backup_count days.
    """

    def __init__(self, name: str, backup_count: int = 7, encoding: str = "utf-8"):
        super().__init__()
        self.name = name
        self.backup_count = backup_count
        self.encoding = encoding
        self.current_date = datetime.now().strftime("%Y%m%d")
        self._fh = None

    def _open(self):
        filename = LOG_DIR / f"{self.name}_{self.current_date}.log"
        # Ensure parent exists (LOG_DIR already exists)
        self._fh = logging.FileHandler(filename, encoding=self.encoding)
        if self.formatter:
            self._fh.setFormatter(self.formatter)

    def _cleanup_old(self):
        # Remove files older than backup_count days matching pattern name_*.log
        pattern = str(LOG_DIR / f"{self.name}_*.log")
        files = glob.glob(pattern)
        cutoff = datetime.now() - timedelta(days=self.backup_count)
        for f in files:
            basename = os.path.basename(f)
            # Expect basename like name_YYYYMMDD.log
            try:
                parts = basename.rsplit("_", 1)
                if len(parts) != 2:
                    continue
                date_part = parts[1].split(".")[0]
                file_date = datetime.strptime(date_part, "%Y%m%d")
                if file_date < cutoff:
                    try:
                        os.remove(f)
                    except Exception:
                        pass
            except Exception:
                # ignore parsing errors
                continue

    def emit(self, record: logging.LogRecord) -> None:
        now_date = datetime.now().strftime("%Y%m%d")
        if self._fh is None:
            self._open()
            self._cleanup_old()
        elif now_date != self.current_date:
            # Date changed: rotate
            try:
                self._fh.close()
            except Exception:
                pass
            self.current_date = now_date
            self._open()
            self._cleanup_old()

        # Delegate emission to underlying FileHandler
        try:
            if self._fh.formatter is None and self.formatter:
                self._fh.setFormatter(self.formatter)
            self._fh.emit(record)
        except Exception:
            self.handleError(record)

    def setFormatter(self, fmt: logging.Formatter) -> None:
        super().setFormatter(fmt)
        if self._fh:
            self._fh.setFormatter(fmt)

    def close(self) -> None:
        try:
            if self._fh:
                self._fh.close()
        finally:
            super().close()


def _make_file_handler(name: str):
    handler = DailyRotatingFileHandler(name, backup_count=7, encoding="utf-8")
    formatter = logging.Formatter(
        "%(asctime)s | %(levelname)-8s | %(name)s | %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )
    handler.setFormatter(formatter)
    return handler


def get_logger(name: str = "app") -> logging.Logger:
    logger = logging.getLogger(name)
    if logger.handlers:
        return logger
    logger.setLevel(logging.DEBUG)
    fh = _make_file_handler(name)
    logger.addHandler(fh)
    sh = logging.StreamHandler()
    sh.setFormatter(
        logging.Formatter("%(asctime)s | %(levelname)-7s | %(name)s | %(message)s", datefmt="%H:%M:%S")
    )
    logger.addHandler(sh)
    return logger


def log_request(logger: logging.Logger, func_name: str, url: str, request_body, response):
    try:
        req_text = json.dumps(request_body, ensure_ascii=False)
    except Exception:
        req_text = str(request_body)

    # Try to capture response text or JSON
    resp_text = None
    try:
        resp_text = response.text
    except Exception:
        resp_text = str(response)

    # Use Chinese labels where appropriate, keep technical terms like URL and status code
    logger.info(
        f"调用: {func_name} | URL: {url} | 请求: {req_text} | 响应状态: {getattr(response, 'status_code', 'N/A')} | 响应: {resp_text}"
    )