"""Regression tests for the SUMMARY_PREFIX tool-use clause (#65848 class).

The REFERENCE ONLY framing must keep its anti-resumption protections while
explicitly NOT restricting tool use — the strong wording was observed bleeding
into general tool-use suppression (narration-only turns after compression).
"""

from agent.context_compressor import (
    _HISTORICAL_SUMMARY_PREFIXES,
    LEGACY_SUMMARY_PREFIX,
    SUMMARY_PREFIX,
)


class TestSummaryPrefixToolUseClause:


    def test_previous_generation_frozen_in_historical_prefixes(self):
        """Per the module contract: whenever SUMMARY_PREFIX changes, the prior
        generation must be frozen into _HISTORICAL_SUMMARY_PREFIXES so old
        persisted summaries still get the directive-strip on re-compaction."""
        assert len(_HISTORICAL_SUMMARY_PREFIXES) >= 3
        # The pre-clause generation (#65848 incident era): same framing, no
        # tools-active clause. Newer generations are prepended ahead of it as
        # the prefix evolves (tuple is newest-first), so match by content,
        # not position. "topic overlap" distinguishes it from the older
        # carveout-era entry.
        pre_clause = [
            p for p in _HISTORICAL_SUMMARY_PREFIXES
            if "tools remain fully active" not in p
            and "topic overlap" in p.lower()
            and "Do NOT answer questions or fulfill requests" in p
        ]
        assert pre_clause, "pre-clause generation missing from frozen tuple"
        assert all(p != SUMMARY_PREFIX for p in pre_clause)


    def test_strip_recognizes_current_and_frozen_prefixes(self):
        """Re-compaction normalization must strip both the live prefix and the
        newly frozen one (the incident generation)."""
        from agent.context_compressor import ContextCompressor

        for prefix in (SUMMARY_PREFIX, _HISTORICAL_SUMMARY_PREFIXES[0]):
            text = f"{prefix}\nsummary body here"
            stripped = ContextCompressor._strip_summary_prefix(text)
            assert "summary body here" in stripped
            assert "REFERENCE ONLY" not in stripped