"""Misc endpoints: health, i18n."""

from __future__ import annotations

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

from app import __version__
from app.config import get_settings
from app.core.embeddings import HashEmbedder
from app.core.logging import get_logger
from app.core.qdrant_client import ping_qdrant
from app.db import get_db
from app.schemas import HealthResponse

_logger = get_logger(__name__)

router = APIRouter(prefix="/api", tags=["misc"])


@router.get("/health", response_model=HealthResponse)
async def health(db: AsyncSession = Depends(get_db)) -> HealthResponse:
    """Health-check endpoint — no auth required."""
    db_ok = False
    qdrant_ok = False
    try:
        await db.execute(text("SELECT 1"))
        db_ok = True
    except Exception as e:  # noqa: BLE001
        _logger.warning("health_db_failed", error=str(e))
    try:
        qdrant_ok = await ping_qdrant()
    except Exception as e:  # noqa: BLE001
        _logger.warning("health_qdrant_failed", error=str(e))

    # LLM health: we treat it as "true" only if api_url is set AND we can avoid a real call.
    # For the basic health probe we don't make any LLM calls — return True iff api_url is configured.
    cfg = get_settings()
    llm_ok = bool(cfg.llm_api_url)

    # Embeddings: True if HashEmbedder works (always does) or if openai provider configured
    embeddings_ok = True
    if cfg.embeddings_provider == "offline_hash":
        try:
            embedder = HashEmbedder(dimension=cfg.embeddings_dimension)
            _ = await embedder.embed(["ping"])
        except Exception:
            embeddings_ok = False

    status_str = "ok" if (db_ok and qdrant_ok) else "degraded"
    return HealthResponse(
        status=status_str,
        db=db_ok,
        qdrant=qdrant_ok,
        llm=llm_ok,
        embeddings=embeddings_ok,
        version=__version__,
    )


@router.get("/i18n/{lang}")
async def i18n(lang: str) -> dict:
    """Return translation JSON for the given language.

    Backend only knows the en/ru bundles used by the frontend; we serve them
    statically from the frontend's `public/i18n/` folder in production, but
    this endpoint is useful for hot-reloading in dev.
    """
    if lang not in ("en", "ru"):
        return {"error": "unsupported language"}
    # The frontend owns the bundles; this endpoint returns an empty dict
    # (the frontend fetches `/i18n/{lang}.json` as a static asset).
    return {"language": lang}