backend/app/main.py

from __future__ import annotations

import logging
from pathlib import Path

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

from app.config import settings
from app.api import decidron

logging.basicConfig(level=logging.INFO)
LOG = logging.getLogger(__name__)

STATIC_DIR = Path(__file__).resolve().parent.parent / "static"

app = FastAPI(
    title="Decidron Network Simulator",
    version="1.0.0",
)

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

app.include_router(decidron.router, prefix="/api")


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


if STATIC_DIR.is_dir():
    from starlette.staticfiles import StaticFiles  # noqa: F401
    from starlette.responses import FileResponse

    @app.get("/{full_path:path}")
    async def serve_spa(request: Request, full_path: str):
        file_path = STATIC_DIR / full_path
        if file_path.is_file():
            return FileResponse(file_path)
        return FileResponse(STATIC_DIR / "index.html")

    LOG.info("Serving frontend from %s", STATIC_DIR)
else:
    LOG.info("No static directory found at %s — frontend not served.", STATIC_DIR)