import sqlite3
from pathlib import Path
from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles

from app.shared.config import Settings, get_settings
from app.shared.database import get_db, init_schema
from app.api.routes import utterances, speakers, rooms, search, rag


def create_app(settings: Settings) -> FastAPI:
    init_schema(settings)
    app = FastAPI(title="LinkedStorm")

    def db_factory() -> sqlite3.Connection:
        return get_db(settings)

    app.include_router(utterances.make_router(settings, db_factory))
    app.include_router(speakers.make_router(settings, db_factory))
    app.include_router(rooms.make_router(settings, db_factory))
    app.include_router(search.make_router(settings, db_factory))
    app.include_router(rag.make_router(settings, db_factory))

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

    # Mount static files last so they don't shadow API routes.
    # Only mount if the directory exists AND contains at least one file,
    # otherwise StaticFiles raises an error on empty directories.
    static_dir = Path(__file__).parent / "static"
    if static_dir.exists() and any(static_dir.iterdir()):
        app.mount("/", StaticFiles(directory=str(static_dir), html=True), name="static")

    return app


_app_instance = None


def app_factory():
    global _app_instance
    if _app_instance is None:
        _app_instance = create_app(get_settings())
    return _app_instance