"""Centralized structured JSON logging for backend and Celery workers."""
import logging
import logging.config
import sys


def setup_logging(level: str = "INFO"):
    """Configure all Python loggers to output structured JSON to stdout."""
    try:
        from pythonjsonlogger.json import JsonFormatter
        formatter_class = "pythonjsonlogger.json.JsonFormatter"
        formatter_fmt = "%(asctime)s %(name)s %(levelname)s %(message)s"
    except ImportError:
        # Fallback if python-json-logger not installed
        formatter_class = "logging.Formatter"
        formatter_fmt = "%(asctime)s [%(levelname)s] %(name)s: %(message)s"

    config = {
        "version": 1,
        "disable_existing_loggers": False,
        "formatters": {
            "json": {
                "class": formatter_class,
                "format": formatter_fmt,
                "datefmt": "%Y-%m-%dT%H:%M:%S",
            },
        },
        "handlers": {
            "console": {
                "class": "logging.StreamHandler",
                "stream": "ext://sys.stdout",
                "formatter": "json",
            },
        },
        "root": {
            "level": level.upper(),
            "handlers": ["console"],
        },
        "loggers": {
            # Quieten noisy libraries
            "uvicorn.access": {"level": "WARNING"},
            "uvicorn.error": {"level": level.upper()},
            "chromadb": {"level": "WARNING"},
            "httpcore": {"level": "WARNING"},
            "httpx": {"level": "WARNING"},
            "celery": {"level": level.upper()},
            "sqlalchemy.engine": {"level": "WARNING"},
        },
    }

    logging.config.dictConfig(config)
    logging.getLogger(__name__).debug("Logging configured: level=%s", level)