from __future__ import annotations

import hashlib
from pathlib import Path

from fastapi import APIRouter, Request
from fastapi.templating import Jinja2Templates

from app.config import settings

router = APIRouter()
templates = Jinja2Templates(directory="app/web/templates")


def _asset_version(path: str) -> str:
    """A short hash of a static asset's content, used to cache-bust it in
    templates -- browsers apply much more aggressive heuristic caching to
    linked CSS/JS than to the dynamically-rendered HTML that references it,
    so without this, a deploy that only changes style.css can leave a
    visitor's browser silently serving the old stylesheet until they
    hard-refresh. Computed once at startup since the file is baked into the
    image and won't change while this process is running."""
    try:
        return hashlib.md5(Path(path).read_bytes()).hexdigest()[:8]
    except FileNotFoundError:
        return "0"


templates.env.globals["static_version"] = _asset_version("app/static/css/style.css")


@router.get("/")
def dashboard(request: Request):
    return templates.TemplateResponse(request, "dashboard.html", {})


@router.get("/plans")
def plans_page(request: Request):
    return templates.TemplateResponse(request, "plans.html", {})


@router.get("/settings")
def settings_page(request: Request):
    return templates.TemplateResponse(
        request,
        "settings.html",
        {"use_mock_isolarcloud": settings.use_mock_isolarcloud, "isolarcloud_auth_mode": settings.isolarcloud_auth_mode},
    )