import base64
import os
import tempfile

from calendar_out.ics import events_to_ics
from server.imageutil import to_data_uri
from server.schema import Event

_TINY_PNG = base64.b64decode(
    "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+M8AAAMBAQDJ/pLvAAAAAElFTkSuQmCC"
)


def test_ics_has_vevent():
    ics = events_to_ics([Event(title="X", start="2026-06-10T13:00:00", end="2026-06-10T14:00:00")])
    assert b"BEGIN:VCALENDAR" in ics
    assert b"BEGIN:VEVENT" in ics


def test_to_data_uri_png():
    p = os.path.join(tempfile.gettempdir(), "ci_tiny.png")
    with open(p, "wb") as f:
        f.write(_TINY_PNG)
    uri = to_data_uri(p)
    assert uri and uri.startswith("data:image/png;base64,")


def test_to_data_uri_rejects_non_image(tmp_path):
    p = tmp_path / "note.txt"
    p.write_text("hello")
    assert to_data_uri(str(p)) is None