"""Application logging setup using structlog."""

from __future__ import annotations

import logging
import sys

import structlog

from app.config import get_settings


def configure_logging() -> None:
    """Configure structlog + stdlib logging once at startup."""
    cfg = get_settings()
    level = getattr(logging, cfg.log_level.upper(), logging.INFO)

    # stdlib root logger
    logging.basicConfig(
        level=level,
        format="%(message)s",
        stream=sys.stdout,
    )

    # structlog processors — JSON output in prod, pretty console in dev
    shared_processors = [
        structlog.contextvars.merge_contextvars,
        structlog.processors.add_log_level,
        structlog.processors.TimeStamper(fmt="iso"),
        structlog.processors.StackInfoRenderer(),
        structlog.processors.format_exc_info,
    ]
    if cfg.debug:
        renderer = structlog.dev.ConsoleRenderer(colors=True)
    else:
        renderer = structlog.processors.JSONRenderer()

    structlog.configure(
        processors=shared_processors + [renderer],
        wrapper_class=structlog.make_filtering_bound_logger(level),
        logger_factory=structlog.PrintLoggerFactory(),
        cache_logger_on_first_use=True,
    )


def get_logger(name: str | None = None) -> structlog.stdlib.BoundLogger:
    """Return a structlog logger bound to `name`."""
    return structlog.get_logger(name)  # type: ignore[return-value]