from contextlib import asynccontextmanager
from pathlib import Path

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles

from src.api.router import api_router
from src.api.schemas.common import HealthResponse
from src.config import settings
from src.db.session import init_db


@asynccontextmanager
async def lifespan(app: FastAPI):
    # Startup: ensure directories exist and init DB
    settings.raw_dir.mkdir(parents=True, exist_ok=True)
    settings.processed_dir.mkdir(parents=True, exist_ok=True)
    settings.chroma_db_path.mkdir(parents=True, exist_ok=True)
    settings.sqlite_db_path.parent.mkdir(parents=True, exist_ok=True)
    await init_db()
    yield


app = FastAPI(
    title="Natural Hygiene RAG API",
    description="Retrieval-Augmented Generation system for Natural Hygiene literature",
    version="0.1.0",
    lifespan=lifespan,
)

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)

app.include_router(api_router)

# Serve static dashboard
_static_dir = Path(__file__).parent / "static"


@app.get("/", include_in_schema=False)
async def dashboard():
    return FileResponse(_static_dir / "index.html")


app.mount("/static", StaticFiles(directory=str(_static_dir)), name="static")


@app.get("/health", response_model=HealthResponse, tags=["Health"])
async def health_check():
    return HealthResponse()