"""PostgresConnectionManager dependency functions are defined here."""

from fastapi import FastAPI, Request
from structlog.stdlib import BoundLogger


def init_dispencer(app: FastAPI, logger: BoundLogger) -> None:
    """Initialize BoundLogger dispencer at app's state."""
    if hasattr(app.state, "logger"):
        if not isinstance(app.state.logger, BoundLogger):
            raise ValueError("logger attribute of app's state is already set" f"with other value ({app.state.logger})")
        return

    app.state.logger = logger


def attach_to_request(request: Request, logger: BoundLogger) -> None:
    """Set logger for a concrete request. If request had already had a logger, replace it."""
    if hasattr(request.state, "logger"):
        if not isinstance(request.state.logger, BoundLogger):
            logger.warning("request.state.logger is already set with other value", value=request.state.logger)
    request.state.logger = logger


def obtain(request: Request) -> BoundLogger:
    """Get a logger from request or app state."""
    if hasattr(request.state, "logger"):
        logger = request.state.logger
        if isinstance(logger, BoundLogger):
            return logger
    if not hasattr(request.app.state, "logger"):
        raise ValueError("BoundLogger dispencer was not initialized at app preparation")
    return request.app.state.logger