from fastapi import Depends, FastAPI, Request, WebSocket
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates

from app.core.config import get_settings
from app.core.database import get_db
from app.modules.auth.dependencies import RequiresLoginException, get_current_user
from app.modules.auth.router import router as auth_router

settings = get_settings()

app = FastAPI(
    title="University Process Hub",
    root_path=settings.APP_PREFIX,
)

app.mount("/static", StaticFiles(directory="app/static"), name="static")
templates = Jinja2Templates(directory="app/templates")

app.include_router(auth_router)


@app.exception_handler(RequiresLoginException)
async def requires_login_handler(request: Request, exc: RequiresLoginException):
    return RedirectResponse(url="/auth/login", status_code=307)


MODULES = [
    {
        "icon": "📡",
        "name": "RSS-Feed Server",
        "description": "Aggregiert und verteilt Neuigkeiten der Fakultät als standardkonformen RSS 2.0 Feed.",
        "status": "active",
    },
    {
        "icon": "📅",
        "name": "Kalender",
        "description": "Veranstaltungen, Prüfungstermine und Fristen im iCal-Format.",
        "status": "planned",
    },
    {
        "icon": "🔔",
        "name": "Benachrichtigungen",
        "description": "Push-Nachrichten und WebSocket-basierte Echtzeit-Alerts für Studierende.",
        "status": "planned",
    },
    {
        "icon": "📊",
        "name": "Auslastung",
        "description": "Raum- und Ressourcenauslastung der Fakultät in Echtzeit.",
        "status": "planned",
    },
    {
        "icon": "📚",
        "name": "Lehrveranstaltungen",
        "description": "Stundenplan-API und Kursinformationen aus dem Campus-System.",
        "status": "planned",
    },
]

NAV_ITEMS = [
    {"label": "Übersicht", "url": "/", "active": True},
    {"label": "RSS-Feeds", "url": "/rss", "active": False},
    {"label": "Kalender", "url": "/kalender", "active": False},
    {"label": "Docs", "url": "/docs", "active": False},
]


def _db_mode() -> str:
    url = settings.DATABASE_URL
    return "SQLite (dev)" if url.startswith("sqlite") else "MariaDB (prod)"


@app.get("/", response_class=HTMLResponse)
async def root(request: Request, current_user=Depends(get_current_user)):
    return templates.TemplateResponse(
        request,
        "index.html",
        {
            "nav_items": NAV_ITEMS,
            "modules": MODULES,
            "db_mode": _db_mode(),
            "app_version": "0.1.0",
            "current_user": current_user,
        },
    )


@app.websocket("/ws/hello/{name}")
async def websocket_hello(websocket: WebSocket, name: str):
    await websocket.accept()
    await websocket.send_text(f"Hello, {name}!")
    await websocket.close()