from fastapi import FastAPI, HTTPException
from fastapi.responses import FileResponse
from fastapi.middleware.cors import CORSMiddleware
from app.models import EmbedRequest, EmbedResponse
from app.embeddings import embed_text
from logging import getLogger

logger = getLogger(__name__)

app = FastAPI(
    title="Embedding API",
    description="A simple API to generate text embeddings using Microsoft's `multilingual-e5-large` model.",
    version="1.0.0",
)

# Allow simple cross-origin requests from local development (adjust in production)
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.post("/embed", response_model=EmbedResponse)
async def embed(request: EmbedRequest) -> dict[str, list[list[float]]]:
    """Generate embeddings for a list of texts."""
    try:
        vectors = embed_text(request.texts)
        return {"embeddings": vectors}
    except Exception as e:
        logger.exception("Error generating embeddings")
        raise HTTPException(status_code=500, detail=str(e))


@app.get("/health")
async def health_check() -> dict[str, str]:
    """Health check endpoint."""
    return {"status": "ok"}


@app.get("/", response_model=None)
async def root() -> FileResponse | dict[str, str]:
    """Serve the frontend `index.html` if present, otherwise return small JSON status."""
    index_file = "frontend/index.html"
    return FileResponse(index_file)