"""
Structured logging configuration for the RAG chatbot.
Outputs both to console and a rotating file handler.
"""

import logging
import os
from logging.handlers import RotatingFileHandler
from pathlib import Path


def setup_logging(
    log_dir: str = "logs",
    log_file: str = "admissions_rag.log",
    level: int = logging.INFO,
    max_bytes: int = 5 * 1024 * 1024,   # 5 MB
    backup_count: int = 3,
) -> logging.Logger:
    Path(log_dir).mkdir(parents=True, exist_ok=True)
    log_path = os.path.join(log_dir, log_file)

    fmt = logging.Formatter(
        fmt="%(asctime)s | %(levelname)-8s | %(name)s | %(message)s",
        datefmt="%Y-%m-%d %H:%M:%S",
    )

    root_logger = logging.getLogger()
    root_logger.setLevel(level)

    # Console handler
    if not any(isinstance(h, logging.StreamHandler) for h in root_logger.handlers):
        ch = logging.StreamHandler()
        ch.setFormatter(fmt)
        root_logger.addHandler(ch)

    # File handler
    fh = RotatingFileHandler(log_path, maxBytes=max_bytes, backupCount=backup_count)
    fh.setFormatter(fmt)
    root_logger.addHandler(fh)

    return root_logger


def get_logger(name: str) -> logging.Logger:
    return logging.getLogger(name)