"""Structured logging via structlog with stdlib bridge.

All modules use ``get_logger(__name__)`` and emit key/value pairs.
"""

from __future__ import annotations

import logging
import sys
from typing import Any

import structlog

from app.config import settings


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

    timestamper = structlog.processors.TimeStamper(fmt="iso", utc=True)

    shared_processors: list[Any] = [
        structlog.contextvars.merge_contextvars,
        structlog.stdlib.add_log_level,
        structlog.stdlib.add_logger_name,
        timestamper,
        structlog.processors.StackInfoRenderer(),
        structlog.processors.format_exc_info,
    ]

    structlog.configure(
        processors=shared_processors
        + [structlog.stdlib.ProcessorFormatter.wrap_for_formatter],
        logger_factory=structlog.stdlib.LoggerFactory(),
        wrapper_class=structlog.stdlib.BoundLogger,
        cache_logger_on_first_use=True,
    )

    formatter = structlog.stdlib.ProcessorFormatter(
        foreign_pre_chain=shared_processors,
        processors=[
            structlog.stdlib.ProcessorFormatter.remove_processors_meta,
            structlog.processors.JSONRenderer(),
        ],
    )

    handler = logging.StreamHandler(sys.stdout)
    handler.setFormatter(formatter)

    root = logging.getLogger()
    root.handlers.clear()
    root.addHandler(handler)
    root.setLevel(level)

    # Quiet down noisy libs
    for noisy in ("urllib3", "botocore", "s3transfer", "elasticsearch", "opensearch", "httpx"):
        logging.getLogger(noisy).setLevel(logging.WARNING)


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