import hmac
from contextlib import asynccontextmanager

from fastapi import Depends, FastAPI, Form, Request
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.staticfiles import StaticFiles

from app import auth
from app.auth import require_auth
from app.config import get_settings
from app.db import get_engine
from app.models.views import create_views
from app.routers import (accounts, categories, gui, imports, planning,
                         scenarios, transactions)
from app.routers.gui import templates
from app.version import get_version


@asynccontextmanager
async def lifespan(app: FastAPI):
    create_views(get_engine())
    yield


app = FastAPI(title="Finanzberatungs-Tool", lifespan=lifespan)

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

app.include_router(gui.router)
app.include_router(accounts.router)
app.include_router(transactions.router)
app.include_router(categories.router)
app.include_router(imports.router)
app.include_router(planning.router)
app.include_router(scenarios.router)


@app.get("/login")
def login_form(request: Request):
    return templates.TemplateResponse(request, "login.html", {})


@app.post("/login")
def login(username: str = Form(...), password: str = Form(...)):
    s = get_settings()
    if not (hmac.compare_digest(username, s.gui_user)
            and auth.verify_password(password, s.gui_password_hash)):
        return HTMLResponse("Login fehlgeschlagen", status_code=401)
    resp = RedirectResponse("/", status_code=303)
    resp.set_cookie(auth.COOKIE, auth.make_session_token(), httponly=True,
                    max_age=auth.MAX_AGE, samesite="lax")
    return resp


@app.post("/logout")
def logout():
    resp = RedirectResponse("/login", status_code=303)
    resp.delete_cookie(auth.COOKIE)
    return resp


@app.get("/api/version", dependencies=[Depends(require_auth)])
def api_version():
    return {"version": get_version()}