import hmac

from fastapi import FastAPI, Form
from fastapi.responses import HTMLResponse, RedirectResponse

from app import auth
from app.config import get_settings
from app.routers import accounts, categories, transactions

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

app.include_router(accounts.router)
app.include_router(transactions.router)
app.include_router(categories.router)


@app.get("/login", response_class=HTMLResponse)
def login_form():
    return """<form method=post action=/login>
      <input name=username placeholder=Benutzer>
      <input name=password type=password placeholder=Passwort>
      <button>Anmelden</button></form>"""


@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