"""IMP-08 B-3 sub-section drag/drop — schema + V4 alias resolver tests.

Fully synthetic per Codex #7 generalization guardrail:
NO real catalog template_id / frame_id, NO ``v4_full32_result.yaml`` dependency,
NO MDX-specific section ids beyond canonical id format.

Locked scope (Stage 3 R8) :
  A. ``derive_parent_id`` canonical ordinal recognition + legacy decimal fallback.
  B. ``_resolve_v4_section_key`` exact > alias > None (no parent/sibling promotion).
"""
from __future__ import annotations

from src.phase_z2_composition import derive_parent_id
from src.phase_z2_pipeline import _resolve_v4_section_key


# ─── A. derive_parent_id ────────────────────────────────────────────────────


def test_derive_parent_id_ordinal_sub():
    assert derive_parent_id("03-1-sub-2") == "03-1"
    assert derive_parent_id("04-2-sub-1") == "04-2"


def test_derive_parent_id_decimal_legacy_alias():
    # Legacy V4 decimal id retains existing behaviour for alias path.
    assert derive_parent_id("04-2.1") == "04-2"


def test_derive_parent_id_top_level_none():
    assert derive_parent_id("04-1") is None
    assert derive_parent_id("04") is None
    assert derive_parent_id("nonsense") is None


# ─── B. _resolve_v4_section_key ─────────────────────────────────────────────


def _fake_v4(*keys):
    return {"mdx_sections": {k: {"judgments_full32": []} for k in keys}}


def test_alias_resolver_exact_match_wins():
    v4 = _fake_v4("04-2-sub-1", "04-2.1")
    assert _resolve_v4_section_key(v4, "04-2-sub-1") == "04-2-sub-1"
    assert (
        _resolve_v4_section_key(v4, "04-2-sub-1", alias_keys=["04-2.1"])
        == "04-2-sub-1"
    )


def test_alias_resolver_decimal_alias_when_metadata_present():
    v4 = _fake_v4("04-2.1")
    assert (
        _resolve_v4_section_key(v4, "04-2-sub-1", alias_keys=["04-2.1"])
        == "04-2.1"
    )


def test_alias_resolver_no_parent_promotion():
    # parent V4 entry must not be promoted into a sibling sub-section lookup.
    v4 = _fake_v4("04-2")
    assert _resolve_v4_section_key(v4, "04-2-sub-1") is None
    assert (
        _resolve_v4_section_key(v4, "04-2-sub-1", alias_keys=["04-2"])
        == "04-2"
    )  # alias is opt-in; only resolves when caller explicitly provides it


def test_alias_resolver_no_sibling_promotion():
    # sibling sub-section entry must not be auto-promoted without an alias.
    v4 = _fake_v4("04-2-sub-2")
    assert _resolve_v4_section_key(v4, "04-2-sub-1") is None


def test_alias_resolver_miss_returns_none():
    v4 = _fake_v4("99-1")
    assert _resolve_v4_section_key(v4, "04-2-sub-1") is None
    assert (
        _resolve_v4_section_key(v4, "04-2-sub-1", alias_keys=["04-2.1"])
        is None
    )