from pathlib import Path


UI_JS = Path("static/ui.js").read_text(encoding="utf-8")


def test_session_html_cache_uses_render_signature_not_only_count():
    assert "function _messageRenderCacheSignature()" in UI_JS
    assert "const renderSignature=_messageRenderCacheSignature();" in UI_JS
    assert "cached.signature===renderSignature" in UI_JS
    assert "signature:renderSignature" in UI_JS


def test_render_signature_tracks_message_content_and_settled_tool_cards():
    signature_fn = UI_JS[UI_JS.index("function _messageRenderCacheSignature()"):UI_JS.index("function _clipCliToolSnippet")]
    assert "msgContent(m)" in signature_fn
    assert "m.tool_calls" in signature_fn
    assert "m._partial_tool_calls" in signature_fn
    assert "S.toolCalls" in signature_fn
    assert "tc.snippet" in signature_fn
    assert "compression_anchor_summary" in signature_fn


def test_documentation_no_longer_allows_same_count_stale_html():
    assert "Known limitation: cache key is session_id + message count" not in UI_JS
    assert "mutate message content without changing the count will serve stale HTML" not in UI_JS