"""FastAPI application for the Aseesa AI Ingestion Agent."""

import asyncio
import logging
from contextlib import asynccontextmanager

from fastapi import FastAPI
from fastapi.responses import RedirectResponse

from app.api.deps import cleanup_expired_sessions
from app.api.routes import ingest, mapping, template
from app.api.routes.ui import router as ui_router
from app.config import settings

CLEANUP_INTERVAL_SECONDS = 3600  # run cleanup every hour


async def _session_cleanup_loop():
    """Background task that periodically cleans up expired sessions."""
    while True:
        await asyncio.sleep(CLEANUP_INTERVAL_SECONDS)
        try:
            cleanup_expired_sessions()
        except Exception as exc:
            logging.getLogger(__name__).warning("Session cleanup error: %s", exc)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Startup/shutdown lifecycle."""
    logging.basicConfig(level=logging.INFO, format="%(asctime)s %(name)s %(levelname)s %(message)s")
    settings.ensure_dirs()
    logging.getLogger(__name__).info("Ingestion AI Agent started")
    cleanup_task = asyncio.create_task(_session_cleanup_loop())
    yield
    cleanup_task.cancel()
    logging.getLogger(__name__).info("Ingestion AI Agent shutting down")


app = FastAPI(
    title="Aseesa AI Ingestion Agent",
    description="AI-powered pharma data ingestion — maps SAS metadata to internal templates",
    version="0.1.0",
    lifespan=lifespan,
)

# API routes
app.include_router(ingest.router, prefix="/api/v1")
app.include_router(mapping.router, prefix="/api/v1")
app.include_router(template.router, prefix="/api/v1")

# UI routes
app.include_router(ui_router)


@app.get("/")
async def root():
    return RedirectResponse(url="/ui/")


@app.get("/health")
async def health_check():
    return {"status": "ok"}