"""The agent banner is one shared file: Agora and Eranos serve the same bytes, so the two sites never drift."""

import hashlib
import os
from pathlib import Path

import pytest

ROOT = Path(__file__).resolve().parents[1]
BANNER = ROOT / "web" / "public" / "agent-banner.js"
# Agora's site/assets/agent-banner.js at commit e29f515 (branch claude/agora-design-20261031).
SHARED_SHA256 = "5616c09ee423eea8e05bb95cee93e3765194c17f8c7c1bd76fbb2eeae934226f"


def _sha(path: Path) -> str:
    return hashlib.sha256(path.read_bytes()).hexdigest()


def test_banner_is_the_shared_file() -> None:
    assert _sha(BANNER) == SHARED_SHA256, (
        "web/public/agent-banner.js differs from the shared banner; copy Agora's file byte for byte"
    )


def test_banner_matches_the_agora_worktree_when_it_is_beside_this_checkout() -> None:
    candidates = [
        os.environ.get("AGORA_BANNER_PATH", ""),
        str(ROOT.parent.parent / "agora" / "agora-src" / "site" / "assets" / "agent-banner.js"),
    ]
    for candidate in filter(None, candidates):
        path = Path(candidate)
        if path.is_file():
            assert _sha(path) == _sha(BANNER), (
                f"{path} and web/public/agent-banner.js have drifted apart"
            )
            return
    pytest.skip("no Agora worktree beside this checkout; the pinned hash above still applies")