"""Health check endpoints: /health (root) and /api/v1/health."""

from __future__ import annotations

import logging

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy import text
from sqlalchemy.ext.asyncio import AsyncSession

from app import __version__
from app.core.db import get_db

logger = logging.getLogger(__name__)

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


async def _check_db(db: AsyncSession) -> bool:
    """Run SELECT 1 to verify the database connection is alive."""
    try:
        result = await db.execute(text("SELECT 1"))
        result.scalar_one()
        return True
    except Exception as e:
        logger.error("Database health check failed: %s", e)
        return False


@router.get(
    "/health",
    summary="Healthcheck (used by Coolify + Kubernetes)",
)
async def health(
    db: AsyncSession = Depends(get_db),
) -> dict:
    """Returns 200 if the API and DB are healthy, 503 if the DB is down."""
    db_ok = await _check_db(db)
    if not db_ok:
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail={"status": "error", "db": "down"},
        )
    return {
        "status": "ok",
        "db": "ok",
        "version": __version__,
    }


@router.get(
    "/api/v1/health",
    summary="Versioned healthcheck (for clients that hit /api/v1/*)",
)
async def api_v1_health(
    db: AsyncSession = Depends(get_db),
) -> dict:
    """Same as /health but under the /api/v1 prefix for versioned routing."""
    db_ok = await _check_db(db)
    if not db_ok:
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail={"status": "error", "db": "down"},
        )
    return {
        "status": "ok",
        "db": "ok",
        "version": __version__,
    }