"""
utils/logger.py — Centralised logging configuration.
Writes simultaneously to stdout (coloured) and a rotating file log.
"""

import logging
import os
import sys
from datetime import datetime
from logging.handlers import RotatingFileHandler

import config


class _ColourFormatter(logging.Formatter):
    """ANSI colour codes for terminal output."""

    GREY   = "\033[38;5;240m"
    CYAN   = "\033[36m"
    YELLOW = "\033[33m"
    RED    = "\033[31m"
    BOLD_R = "\033[1;31m"
    RESET  = "\033[0m"

    LEVEL_COLOURS = {
        logging.DEBUG   : GREY,
        logging.INFO    : CYAN,
        logging.WARNING : YELLOW,
        logging.ERROR   : RED,
        logging.CRITICAL: BOLD_R,
    }

    def format(self, record: logging.LogRecord) -> str:
        colour = self.LEVEL_COLOURS.get(record.levelno, self.RESET)
        fmt = (
            f"{self.GREY}%(asctime)s{self.RESET}  "
            f"{colour}%(levelname)-8s{self.RESET}  "
            f"%(name)-20s  %(message)s"
        )
        formatter = logging.Formatter(fmt, datefmt="%H:%M:%S")
        return formatter.format(record)


def get_logger(name: str) -> logging.Logger:
    """
    Return a configured logger for *name*.

    All loggers share the same handlers so duplicate lines never appear.
    Call once per module:  logger = get_logger(__name__)
    """
    logger = logging.getLogger(name)

    # Avoid adding handlers more than once (module re-imports)
    if logger.handlers:
        return logger

    level = getattr(logging, config.LOG_LEVEL.upper(), logging.INFO)
    logger.setLevel(level)

    # ── Console handler ──────────────────────────────────────────────────
    ch = logging.StreamHandler(sys.stdout)
    ch.setLevel(level)
    ch.setFormatter(_ColourFormatter())
    logger.addHandler(ch)

    # ── File handler ─────────────────────────────────────────────────────
    if config.LOG_TO_FILE:
        log_filename = os.path.join(
            config.LOGS_DIR,
            f"scraper_{datetime.now().strftime('%Y%m%d')}.log",
        )
        fh = RotatingFileHandler(
            log_filename,
            maxBytes=5 * 1024 * 1024,   # 5 MB
            backupCount=7,
            encoding="utf-8",
        )
        fh.setLevel(level)
        plain_fmt = logging.Formatter(
            "%(asctime)s  %(levelname)-8s  %(name)-20s  %(message)s",
            datefmt="%Y-%m-%d %H:%M:%S",
        )
        fh.setFormatter(plain_fmt)
        logger.addHandler(fh)

    # Prevent propagation to root logger (avoids double-printing)
    logger.propagate = False
    return logger