import re

from fastapi.testclient import TestClient

import main


def test_assets_are_versioned_and_the_page_is_not_cached():
    # Not a context manager: that would run the lifespan, which seeds months of
    # history from Yahoo before serving anything.
    response = TestClient(main.app).get("/")

    assert response.headers["cache-control"] == "no-store"
    refs = re.findall(r'(?:src|href)="(/static/[^"]+)"', response.text)
    assert refs, "no static assets referenced"
    # Without this a tab left open keeps running the JavaScript it first loaded,
    # which made a fixed bug look like it was still broken.
    assert all("?v=" in ref for ref in refs), refs


def test_version_tracks_content_not_timestamps(tmp_path, monkeypatch):
    asset = tmp_path / "app.js"
    asset.write_text("//", encoding="utf-8")
    monkeypatch.setattr(main, "STATIC_DIR", tmp_path)

    first = main.asset_version()
    asset.touch()
    # A deploy checks every file out fresh; unchanged assets must stay cached.
    assert main.asset_version() == first

    asset.write_text("// changed", encoding="utf-8")
    assert main.asset_version() != first