"""Systemendpunkte: Health-Check und Versionsinformation (ohne Authentifizierung)."""

from datetime import datetime
from zoneinfo import ZoneInfo

from fastapi import APIRouter, Depends
from pydantic import BaseModel, Field
from sqlalchemy import text
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.config import settings
from app.db.session import get_session

router = APIRouter(tags=["system"])


class HealthResponse(BaseModel):
    status: str = Field(description="'ok' wenn Anwendung und Datenbank erreichbar sind.")
    database: str = Field(description="'ok' oder 'unavailable'.")
    time: datetime = Field(description="Aktuelle Serverzeit in Europe/Berlin.")


class VersionResponse(BaseModel):
    name: str
    version: str
    environment: str
    timezone: str
    currency: str


@router.get("/health", response_model=HealthResponse, summary="Health-Check")
async def health(session: AsyncSession = Depends(get_session)) -> HealthResponse:
    """Prüft die Datenbankverbindung. Wird vom Docker-Healthcheck verwendet."""
    database = "ok"
    try:
        await session.execute(text("SELECT 1"))
    except Exception:
        database = "unavailable"
    return HealthResponse(
        status="ok" if database == "ok" else "degraded",
        database=database,
        time=datetime.now(ZoneInfo(settings.timezone)),
    )


@router.get("/version", response_model=VersionResponse, summary="Versionsinformation")
async def version() -> VersionResponse:
    return VersionResponse(
        name=settings.app_name,
        version=settings.app_version,
        environment=settings.environment,
        timezone=settings.timezone,
        currency=settings.default_currency,
    )