"""Structured, JSON-compatible logging with per-request correlation IDs.

Every request gets a request ID (from the `X-Request-ID` header if present,
otherwise generated) bound into the log context for the lifetime of that
request, via `RequestIDMiddleware` in `app.main`.
"""

from __future__ import annotations

import logging
import sys
from contextvars import ContextVar

import structlog

from app.core.config import get_settings

request_id_ctx: ContextVar[str | None] = ContextVar("request_id", default=None)


def _add_request_id(_logger: object, _method_name: str, event_dict: dict) -> dict:
    request_id = request_id_ctx.get()
    if request_id is not None:
        event_dict["request_id"] = request_id
    return event_dict


def configure_logging() -> None:
    settings = get_settings()
    level = getattr(logging, settings.AURORA_LOG_LEVEL.upper(), logging.INFO)

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

    shared_processors: list = [
        structlog.contextvars.merge_contextvars,
        _add_request_id,
        structlog.processors.add_log_level,
        structlog.processors.TimeStamper(fmt="iso"),
        structlog.processors.StackInfoRenderer(),
    ]

    renderer: structlog.types.Processor
    if settings.is_production or settings.AURORA_ENV != "development":
        renderer = structlog.processors.JSONRenderer()
    else:
        renderer = structlog.dev.ConsoleRenderer()

    structlog.configure(
        processors=[*shared_processors, structlog.processors.format_exc_info, renderer],
        wrapper_class=structlog.make_filtering_bound_logger(level),
        context_class=dict,
        logger_factory=structlog.PrintLoggerFactory(),
        cache_logger_on_first_use=True,
    )


def get_logger(name: str | None = None) -> structlog.stdlib.BoundLogger:
    return structlog.get_logger(name)