"""IMP-38 U3 regression — call site cleanup (max_rank=3 제거) 후 policy 활성 검증.

Scenarios:
  (A) normal case: rank 1~default_max_rank window 에 usable candidate 충분
      → effective_max_rank=default_max_rank (rank-3-preserved)
      → mdx03 식: rank 1 use_as_is 매칭 정상 case 보호 확인
  (B) extended case: rank 1~default_max_rank window 에 usable candidate 0
      → effective_max_rank=effective_extended_ceiling (rank-extended)
      → mdx05-2 식: rank 1~9 미등록/reject + rank 10+ 등록 frame case 처리

4 round 합의 (#67):
  - Codex #1: 별 yaml + loader (catalog 오염 방지)
  - Codex #2: min(configured, len(judgments)) 정정
  - Codex #6: 2 call site cleanup (HEAD 기준 — IMP-47B 가 추가한 3 번째는 별 axis)
  - Codex #7: U3 execute ready
"""
from __future__ import annotations

import pytest


@pytest.fixture(autouse=True)
def _reset_policy_cache():
    """Reset module-level _V4_FALLBACK_POLICY_CACHE for test isolation."""
    import src.phase_z2_mapper as mapper
    mapper._V4_FALLBACK_POLICY_CACHE = None
    yield
    mapper._V4_FALLBACK_POLICY_CACHE = None


def _make_v4_section(judgments: list[dict]) -> dict:
    return {"mdx_sections": {"sec-1": {"judgments_full32": judgments}}}


def _judgment(template_id: str, label: str, confidence: float = 0.5, frame_id: int = 0) -> dict:
    return {
        "template_id": template_id,
        "frame_id": frame_id or (hash(template_id) % 10000),
        "frame_number": 0,
        "confidence": confidence,
        "label": label,
    }


# ─── Scenario A — normal case (rank-3-preserved) ──────────────────


def test_normal_case_with_usable_candidates_preserves_default_max_rank():
    """rank 1~3 window 에 usable >= threshold(1) 시 effective_max_rank=default_max_rank(3)."""
    from src.phase_z2_pipeline import lookup_v4_match_with_fallback
    from src.phase_z2_mapper import load_frame_contracts

    # mdx03 식 — 첫 rank 가 catalog 등록 + use_as_is/light_edit/restructure(allowed)
    # 실제 catalog 등록 frame 사용 (catalog hardcode 의존 — 단 frame 32 중 어느 게 등록인지는 yaml 기반)
    catalog = load_frame_contracts()
    registered_template_ids = [k for k, v in catalog.items() if isinstance(v, dict)]
    assert len(registered_template_ids) >= 1, "catalog 등록 frame 1+ 필요 (mdx03 식 fixture)"

    # rank 1 = registered frame + use_as_is (auto-renderable)
    # rank 2~3 = reject (catalog 등록 무관)
    first_registered = registered_template_ids[0]
    judgments = [
        _judgment(first_registered, "use_as_is", 0.95),
        _judgment("dummy_rank2", "reject", 0.3),
        _judgment("dummy_rank3", "reject", 0.2),
    ]
    v4 = _make_v4_section(judgments)

    _match, trace = lookup_v4_match_with_fallback(v4, "sec-1")  # no explicit max_rank → policy
    assert trace["policy_applied"] == "default_max_rank", (
        f"normal case 에서 default 유지 기대, got {trace['policy_applied']}"
    )
    assert trace["effective_max_rank"] == trace["default_max_rank"]
    assert trace["usable_count"] >= 1


# ─── Scenario B — extended case (rank-extended) ────────────────────


def test_extended_case_with_no_usable_in_default_window_expands_to_ceiling():
    """rank 1~3 window 에 0 usable 시 effective_max_rank=effective_extended_ceiling."""
    from src.phase_z2_pipeline import lookup_v4_match_with_fallback

    # mdx05-2 식 — rank 1~3 미등록 (template_id 가 catalog 에 없음) + reject 라벨
    # rank 4~ 도 등록 안 됨 (fixture 단순화)
    # 다만 judgments_count=10 으로 충분 → effective_extended_ceiling = min(extended, 10) = 10
    judgments = [
        _judgment(f"unregistered_t{i}", "reject", 0.1 + i * 0.01) for i in range(10)
    ]
    v4 = _make_v4_section(judgments)

    _match, trace = lookup_v4_match_with_fallback(v4, "sec-1")
    assert trace["policy_applied"] == "extended_max_rank", (
        f"extended case 기대, got {trace['policy_applied']}"
    )
    assert trace["usable_count"] == 0
    assert trace["judgments_count"] == 10
    # Codex #2 정정: min(configured, 10) — configured 32 면 10, 5 면 5
    assert trace["effective_extended_ceiling"] == min(
        trace["configured_extended_max_rank"], 10
    )
    assert trace["effective_max_rank"] == trace["effective_extended_ceiling"]


# ─── Scenario C — call site cleanup byte-identical (caller_override 제거 후 policy 활성) ─


def test_default_call_site_now_uses_policy_after_cleanup():
    """U3 cleanup 후 call site = no explicit max_rank → policy path 자동 활성.

    이전: caller 가 max_rank=3 명시 → policy_applied=caller_override
    U3 후: caller 가 명시 X → policy_applied=default_max_rank (usable >= 1 시) or extended_max_rank
    """
    from src.phase_z2_pipeline import lookup_v4_match_with_fallback
    judgments = [_judgment(f"unregistered_t{i}", "reject") for i in range(5)]
    v4 = _make_v4_section(judgments)

    # caller 가 max_rank 명시 X (U3 cleanup 후 production caller 의 새 동작)
    _match, trace = lookup_v4_match_with_fallback(v4, "sec-1")
    assert trace["policy_applied"] in {"default_max_rank", "extended_max_rank"}
    assert trace["policy_applied"] != "caller_override", (
        "U3 cleanup 후 production caller = no explicit, policy path 활성 기대"
    )


# ─── Scenario D — explicit caller_override 여전히 동작 (test path 보호) ────


def test_explicit_caller_override_still_works_for_tests():
    """test 에서 explicit max_rank=N 보낼 시 caller_override 그대로 동작 (backward compat)."""
    from src.phase_z2_pipeline import lookup_v4_match_with_fallback
    judgments = [_judgment(f"unregistered_t{i}", "reject") for i in range(10)]
    v4 = _make_v4_section(judgments)

    _match, trace = lookup_v4_match_with_fallback(v4, "sec-1", max_rank=5)
    assert trace["policy_applied"] == "caller_override"
    assert trace["effective_max_rank"] == 5