from __future__ import annotations

from headroom.ccr.tool_injection import CCRToolInjector
from headroom.proxy.ccr_marker_policy import has_new_ccr_markers


def _hashes(*contents: str) -> list[str]:
    injector = CCRToolInjector(
        provider="anthropic",
        inject_tool=False,
        inject_system_instructions=False,
    )
    injector.scan_for_markers([{"role": "user", "content": content} for content in contents])
    return injector.detected_hashes


def test_has_new_ccr_markers_filters_replayed_forwarded_markers() -> None:
    marker = "[100 items compressed to 10. Retrieve more: hash=abc123def456abc123def456]"

    assert (
        has_new_ccr_markers(
            current_detected_hashes=_hashes(marker),
            previous_forwarded_messages=[{"role": "user", "content": marker}],
            provider="anthropic",
        )
        is False
    )


def test_source_line_span_marker_is_still_detected() -> None:
    # The compressor annotates the count with a source-line span (#2586); the
    # retrieval hash must still be extracted from the enriched marker.
    marker = "[122 items compressed to 27 (from 5 source lines). Retrieve more: hash=c00eb437e5e5c00eb437e5e5]"
    assert _hashes(marker) == ["c00eb437e5e5c00eb437e5e5"]


def test_has_new_ccr_markers_detects_hash_not_seen_in_previous_forward() -> None:
    old = "[100 items compressed to 10. Retrieve more: hash=abc123def456abc123def456]"
    new = "[50 items compressed to 5. Retrieve more: hash=deadbeefdeadbeefdeadbeef]"

    assert (
        has_new_ccr_markers(
            current_detected_hashes=_hashes(old, new),
            previous_forwarded_messages=[{"role": "user", "content": old}],
            provider="anthropic",
        )
        is True
    )


def test_has_new_ccr_markers_treats_missing_previous_forward_as_new() -> None:
    marker = "[100 items compressed to 10. Retrieve more: hash=abc123def456abc123def456]"

    assert (
        has_new_ccr_markers(
            current_detected_hashes=_hashes(marker),
            previous_forwarded_messages=None,
            provider="anthropic",
        )
        is True
    )


def test_has_new_ccr_markers_returns_false_without_current_hashes() -> None:
    assert (
        has_new_ccr_markers(
            current_detected_hashes=[],
            previous_forwarded_messages=None,
            provider="anthropic",
        )
        is False
    )