# api/main.py
import os
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse
from slowapi import Limiter, _rate_limit_exceeded_handler
from slowapi.util import get_remote_address
from slowapi.errors import RateLimitExceeded
from api.routes.query import router as query_router
from api.routes.health import router as health_router

from api.startup_checks import validate_secrets
validate_secrets()

limiter = Limiter(key_func=get_remote_address)

app = FastAPI(
    title="SchemeSaathi API",
    description="Agentic RAG over 3400 Indian government welfare schemes",
    version="1.0.0",
)

app.state.limiter = limiter
app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)

app.include_router(health_router)
app.include_router(query_router)

# Serve frontend
FRONTEND_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)), "frontend")

if os.path.exists(FRONTEND_DIR):
    app.mount("/static", StaticFiles(directory=FRONTEND_DIR), name="static")

    @app.get("/")
    async def root():
        return FileResponse(os.path.join(FRONTEND_DIR, "index.html"))