from contextlib import asynccontextmanager

import os

from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from fastapi.responses import HTMLResponse

from backend.database import engine
from backend.routers import health, subreddits, posts, comments, authors, analytics, digests, summaries


@asynccontextmanager
async def lifespan(app: FastAPI):
    yield
    await engine.dispose()


app = FastAPI(title="Reddit Monitor", lifespan=lifespan)

# API routes
app.include_router(health.router, prefix="/api/v1")
app.include_router(subreddits.router, prefix="/api/v1")
app.include_router(posts.router, prefix="/api/v1")
app.include_router(comments.router, prefix="/api/v1")
app.include_router(authors.router, prefix="/api/v1")
app.include_router(analytics.router, prefix="/api/v1")
app.include_router(digests.router, prefix="/api/v1")
app.include_router(summaries.router, prefix="/api/v1")


# SPA static file serving (only when frontend is built)
STATIC_DIR = "/app/static"
_index_html = ""

if os.path.isdir(STATIC_DIR):
    with open(os.path.join(STATIC_DIR, "index.html")) as f:
        _index_html = f.read()

    app.mount("/assets", StaticFiles(directory=os.path.join(STATIC_DIR, "assets")), name="assets")

    @app.get("/{full_path:path}")
    async def serve_spa(full_path: str):
        return HTMLResponse(_index_html)