"""IMP-47B u3 — override-selected reject frames are admitted as provisional.

Scope (this slice):
  Helper `_apply_frame_override_to_unit` (src/phase_z2_pipeline.py) covers
  the three probe layers used by the `--override-frame` path:

    1. ``v4_candidates`` exact match (non-reject; existing behaviour).
    2. Full 32 V4 judgments probe (reject inclusive) — when the user
       picks a reject frame, the unit is promoted to
       ``provisional=True`` with ``label="reject"`` so Step 12
       (IMP-47B u4) admits the AI repair path.
    3. Raw fall-through (template_id only) — no provisional promotion,
       no label mutation.

Frame visual / contract stay untouched per the AI isolation contract
(frame auto-swap forbidden — AI re-places content into the existing
frame only). Sibling test confirms a non-reject override still goes
through the v4_candidates path without provisional promotion.

Synthetic naming convention mirrors tests/test_phase_z2_imp30_first_render.py
(MOCK_ prefix mandatory, no real catalog template_id / frame_id leakage).
"""
from __future__ import annotations

from dataclasses import dataclass, field
from typing import Optional

from src.phase_z2_pipeline import _apply_frame_override_to_unit


@dataclass
class _StubCandidate:
    template_id: str
    frame_id: str
    frame_number: int
    confidence: float
    label: str


@dataclass
class _StubUnit:
    source_section_ids: list[str]
    frame_template_id: Optional[str] = None
    frame_id: Optional[str] = None
    frame_number: int = 0
    confidence: float = 0.0
    label: Optional[str] = None
    provisional: bool = False
    v4_candidates: list = field(default_factory=list)


def _v4_with_reject(section_id: str, target_tid: str) -> dict:
    """Synthetic V4 dict with target_tid mapped to a reject judgment.

    Mirrors the production V4 schema surface (``mdx_sections`` →
    ``judgments_full32`` → list of judgment dicts with template_id /
    frame_id / frame_number / confidence / label). Two judgments so we
    can also assert that the helper picks the reject entry rather than
    the first non-reject one when the template_ids differ.
    """
    return {
        "mdx_sections": {
            section_id: {
                "judgments_full32": [
                    {
                        "template_id": "MOCK_T_other",
                        "frame_id": "F_other",
                        "frame_number": 1,
                        "confidence": 0.85,
                        "label": "use_as_is",
                    },
                    {
                        "template_id": target_tid,
                        "frame_id": "F_reject",
                        "frame_number": 32,
                        "confidence": 0.40,
                        "label": "reject",
                    },
                ],
            },
        },
    }


# ─── Case 1 : reject override → provisional promotion ────────────


def test_override_to_reject_judgment_marks_unit_provisional():
    """User picks a reject frame → unit.label=reject, provisional=True.

    Frame metadata is sourced from the reject judgment (frame_id /
    frame_number / confidence) so Step 9 metadata stays consistent.
    """
    unit = _StubUnit(
        source_section_ids=["MOCK_S1"],
        frame_template_id="MOCK_T_auto",
        frame_id="F_auto",
        frame_number=5,
        confidence=0.90,
        label="use_as_is",
        provisional=False,
    )
    v4 = _v4_with_reject("MOCK_S1", "MOCK_T_reject")

    meta = _apply_frame_override_to_unit(unit, "MOCK_T_reject", v4)

    assert meta == "v4_reject_judgment_provisional"
    assert unit.frame_template_id == "MOCK_T_reject"
    assert unit.frame_id == "F_reject"
    assert unit.frame_number == 32
    assert unit.confidence == 0.40
    assert unit.label == "reject"
    assert unit.provisional is True


# ─── Case 2 : non-reject override → existing v4_candidates path ───


def test_override_to_v4_candidate_keeps_non_provisional():
    """User picks a non-reject candidate → existing v4_candidates path.

    Helper takes the early v4_candidates branch without consulting the
    full 32 judgments. provisional remains False (normal-path AI=0
    contract — IMP-30 / IMP-47B router gate intact for this unit).
    """
    unit = _StubUnit(
        source_section_ids=["MOCK_S2"],
        frame_template_id="MOCK_T_auto",
        frame_id="F_auto",
        frame_number=3,
        confidence=0.95,
        label="use_as_is",
        provisional=False,
        v4_candidates=[
            _StubCandidate(
                template_id="MOCK_T_pick",
                frame_id="F_pick",
                frame_number=2,
                confidence=0.85,
                label="light_edit",
            ),
        ],
    )
    v4 = {"mdx_sections": {}}  # full-judgment probe must NOT be reached

    meta = _apply_frame_override_to_unit(unit, "MOCK_T_pick", v4)

    assert meta == "v4_candidates"
    assert unit.frame_template_id == "MOCK_T_pick"
    assert unit.frame_id == "F_pick"
    assert unit.label == "light_edit"
    assert unit.provisional is False


# ─── Case 3 : unknown template → raw fall-through (no provisional) ─


def test_override_unknown_template_falls_through_without_provisional():
    """Template ID absent from v4_candidates AND from judgments_full32 →
    raw_template_id_only path. No provisional flag, no label change.
    """
    unit = _StubUnit(
        source_section_ids=["MOCK_S3"],
        frame_template_id="MOCK_T_auto",
        frame_id="F_auto",
        frame_number=4,
        confidence=0.92,
        label="use_as_is",
        provisional=False,
    )
    v4 = {"mdx_sections": {}}

    meta = _apply_frame_override_to_unit(unit, "MOCK_T_unknown", v4)

    assert meta == "raw_template_id_only"
    assert unit.frame_template_id == "MOCK_T_unknown"
    # frame_id / label unchanged — caller's print path warns on this case.
    assert unit.frame_id == "F_auto"
    assert unit.label == "use_as_is"
    assert unit.provisional is False