from contextlib import asynccontextmanager

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from app.config.settings import settings


@asynccontextmanager
async def lifespan(app: FastAPI):
    # Startup: initialise DB connection pool and agent registry
    from app.core.agent_registry import registry  # noqa: F401 — triggers module load
    import app.agents  # noqa: F401 — triggers @registry.register decorators

    yield

    # Shutdown: nothing to clean up for now


def create_app() -> FastAPI:
    app = FastAPI(
        title="Adiuva Cloud API",
        version="0.1.0",
        docs_url="/docs" if settings.ENV == "dev" else None,
        redoc_url=None,
        lifespan=lifespan,
    )

    app.add_middleware(
        CORSMiddleware,
        allow_origins=settings.CORS_ORIGINS,
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    # Routers (registered when implemented)
    # from app.api.routes import auth, chat, plans, backup, billing
    # app.include_router(auth.router, prefix="/api/v1")
    # app.include_router(chat.router, prefix="/api/v1")
    # app.include_router(plans.router, prefix="/api/v1")
    # app.include_router(backup.router, prefix="/api/v1")
    # app.include_router(billing.router, prefix="/api/v1")

    @app.get("/api/v1/health", tags=["health"])
    async def health() -> dict:
        return {"status": "ok", "version": app.version}

    return app


app = create_app()