"""Pagine HTML servite direttamente da ml.mebboat.it.

Layout:
  /           redirect a /datasets (o landing console)
  /datasets   lista/upload dataset
  /models     registro modelli
  /train      avvia training
  /test       esegue test su modello trainato
  /results    storico e confronto risultati
"""
from __future__ import annotations

from pathlib import Path

from fastapi import APIRouter, Depends, Request
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.templating import Jinja2Templates

from core.auth import _verify
from core.config import settings

router = APIRouter(tags=["pages"])

TEMPLATES_DIR = Path(__file__).resolve().parent.parent / "templates"
templates = Jinja2Templates(directory=str(TEMPLATES_DIR))


def _user_or_redirect(request: Request):
    """Per le pagine, se non autenticato redirect al login. Ritorna user dict o RedirectResponse."""
    token = request.cookies.get("auth_token")
    auth = request.headers.get("authorization")
    if not token and auth and auth.startswith("Bearer "):
        token = auth[7:]
    user = _verify(token)
    if not user:
        target = str(request.url)
        return RedirectResponse(url=f"{settings.auth_login_url}?redirect={target}", status_code=302)
    return user


def _render(request: Request, template: str, **ctx):
    user = _user_or_redirect(request)
    if isinstance(user, RedirectResponse):
        return user
    return templates.TemplateResponse(template, {"request": request, "user": user, **ctx})


@router.get("/", response_class=HTMLResponse)
async def home(request: Request):
    return RedirectResponse(url="/datasets")


@router.get("/datasets", response_class=HTMLResponse)
async def page_datasets(request: Request):
    return _render(request, "datasets.html", page="datasets")


@router.get("/models", response_class=HTMLResponse)
async def page_models(request: Request):
    return _render(request, "models.html", page="models")


@router.get("/train", response_class=HTMLResponse)
async def page_train(request: Request):
    return _render(request, "train.html", page="train")


@router.get("/test", response_class=HTMLResponse)
async def page_test(request: Request):
    return _render(request, "test.html", page="test")


@router.get("/results", response_class=HTMLResponse)
async def page_results(request: Request):
    return _render(request, "results.html", page="results")