import json
from typing import Any

from fastapi import Request
from sqlalchemy.orm import Session

from app.models.audit_log import AuditLog
from app.models.user import User


def get_client_ip(request: Request | None) -> str | None:
    if request is None:
        return None
    forwarded = request.headers.get("x-forwarded-for")
    if forwarded:
        return forwarded.split(",")[0].strip()
    if request.client:
        return request.client.host
    return None


def log_action(
    db: Session,
    action: str,
    *,
    user: User | None = None,
    resource_type: str | None = None,
    resource_id: int | None = None,
    details: dict[str, Any] | None = None,
    ip_address: str | None = None,
) -> None:
    entry = AuditLog(
        user_id=user.id if user else None,
        username=user.username if user else None,
        action=action,
        resource_type=resource_type,
        resource_id=resource_id,
        details=json.dumps(details, ensure_ascii=False) if details else None,
        ip_address=ip_address,
    )
    db.add(entry)