"""IMP-35 (#64) u6 — Composition popup binding tests.

Stage 2 binding contract (unit u6):
  ``bind_popup_display_strategy`` in ``src/phase_z2_composition.py`` is
  the composition-side binding that translates the unit-side marker
  (``has_popup`` + ``popup_escalation_plan``) stamped by the Step 17
  POPUP gate (u5 in ``src/phase_z2_ai_fallback/step17.py``) into a
  deterministic zone payload structure that u7 wires into the renderer.

  Key invariants this file locks:
    1. Strategy id is the catalog key (yaml is source of truth) — no
       hardcoded literal string drift between code and
       ``display_strategies.yaml``.
    2. ``has_popup=False`` units bind to ``inline_full`` (no popup).
    3. ``has_popup=True`` units bind to ``inline_preview_with_details``
       (preview = excerpt from container px budget downstream; popup
       body holds the FULL original per CLAUDE.md 자세히보기 원칙).
    4. ``popup_body_source`` is the FULL ``raw_content``, verbatim —
       u6 NEVER trims or summarizes (MDX 원문 무손실 보존, 오답노트 #5,
       IMPROVEMENT-REDESIGN.md §3.6 line 110).
    5. ``detail_trigger.placement`` / ``label`` come from the catalog
       entry's ``detail_trigger`` block, not from code constants.
    6. The popup-binding strategy MUST have ``preserves_original=True``
       in the catalog (defensive yaml-drift guard).
    7. No AI call. ``bind_popup_display_strategy`` is pure composition-
       side binding — feedback_ai_isolation_contract.

Cross-references:
  - u3 router stub (``plan_details_popup_escalation``):
      tests/phase_z2/test_phase_z2_router_popup.py
  - u4 api_gated split-decision contract:
      tests/phase_z2_ai_fallback/test_step17.py
  - u5 Step 17 POPUP gate (stamps the marker u6 reads):
      tests/phase_z2/test_phase_z2_step17_popup_gate.py
"""
from __future__ import annotations

from dataclasses import dataclass, field
from typing import Optional

import pytest

from src.phase_z2_composition import (
    DISPLAY_STRATEGIES,
    POPUP_BINDING_ESCALATED_STRATEGY_ID,
    POPUP_BINDING_NO_POPUP_STRATEGY_ID,
    bind_popup_display_strategy,
)


# ─── Synthetic stubs ─────────────────────────────────────────────────


@dataclass
class _StubUnit:
    """Minimal duck-typed CompositionUnit for u6 binding tests.

    Mirrors only the fields ``bind_popup_display_strategy`` reads via
    getattr — keeps the test independent of the full CompositionUnit
    dataclass evolution (e.g., IMP-30 / IMP-48 axis additions).
    """

    raw_content: str = "MOCK_ORIGINAL_CONTENT"
    has_popup: bool = False
    popup_escalation_plan: Optional[dict] = None


def _stub_popup_plan(category: str = "structural_major_overflow") -> dict:
    """Mirror the shape ``plan_details_popup_escalation`` returns on a
    feasible escalation. u6 echoes this verbatim — no field is consumed
    here other than as a traceable payload."""
    return {
        "action": "details_popup_escalation",
        "stub": True,
        "feasible": True,
        "category": category,
        "needs_split_decision": True,
        "rationale": "MOCK_RATIONALE",
        "mapping_source": "IMP-35 u3 plan_details_popup_escalation stub",
    }


# ─── Catalog constants are catalog keys (no hardcoded drift) ─────────


def test_popup_binding_strategy_ids_are_catalog_keys():
    """u6 — both constants used by the binder must resolve against the
    yaml catalog. Defensive guard against catalog rename / removal."""
    assert POPUP_BINDING_NO_POPUP_STRATEGY_ID in DISPLAY_STRATEGIES
    assert POPUP_BINDING_ESCALATED_STRATEGY_ID in DISPLAY_STRATEGIES


def test_popup_binding_escalated_strategy_preserves_original_in_catalog():
    """u6 — the escalated-path strategy MUST preserve original content
    in the catalog (yaml lock — MDX 원문 무손실 보존). If yaml drift ever
    flips this to False, the binder must surface the violation; this
    test locks the catalog side of that invariant."""
    meta = DISPLAY_STRATEGIES[POPUP_BINDING_ESCALATED_STRATEGY_ID]
    assert meta.get("preserves_original") is True, (
        "Catalog entry for the popup-binding strategy must declare "
        "preserves_original=True (오답노트 #5 / IMPROVEMENT-REDESIGN.md §3.6)."
    )


def test_popup_binding_escalated_strategy_has_detail_trigger_in_catalog():
    """u6 — the escalated-path strategy MUST declare a detail_trigger
    block with placement + label in the catalog. The binder reads from
    the yaml — no code-side string literal drift."""
    meta = DISPLAY_STRATEGIES[POPUP_BINDING_ESCALATED_STRATEGY_ID]
    trigger = meta.get("detail_trigger")
    assert isinstance(trigger, dict)
    assert trigger.get("placement"), (
        "Catalog detail_trigger.placement must be non-empty so the binder "
        "can stamp a deterministic trigger position on the zone payload."
    )
    assert trigger.get("label"), (
        "Catalog detail_trigger.label must be non-empty so the binder "
        "can stamp a deterministic trigger identifier on the zone payload."
    )


# ─── has_popup=False path ────────────────────────────────────────────


def test_bind_returns_inline_full_when_unit_has_no_popup_marker():
    """u6 — units that never went through the Step 17 POPUP gate carry
    has_popup=False. The binder returns the catalog ``inline_full``
    strategy with no popup body / no detail trigger."""
    unit = _StubUnit(raw_content="MOCK_BODY", has_popup=False)
    payload = bind_popup_display_strategy(unit)
    assert payload["display_strategy"] == POPUP_BINDING_NO_POPUP_STRATEGY_ID
    assert payload["popup_body_source"] is None
    assert payload["detail_trigger"] is None
    assert payload["has_popup"] is False
    assert payload["popup_escalation_plan"] is None
    # preserves_original mirrors the catalog inline_full entry.
    expected_preserves = bool(
        DISPLAY_STRATEGIES[POPUP_BINDING_NO_POPUP_STRATEGY_ID].get(
            "preserves_original"
        )
    )
    assert payload["preserves_original"] is expected_preserves


def test_bind_default_when_unit_has_no_has_popup_attr_at_all():
    """u6 — defensive default. Units that lack the ``has_popup`` attr
    entirely (e.g., third-party duck-typed stubs that don't carry the
    Step 17 marker) bind to the no-popup path. The getattr() default
    branch must hold."""

    class _BareUnit:
        raw_content = "MOCK_BODY"

    payload = bind_popup_display_strategy(_BareUnit())
    assert payload["display_strategy"] == POPUP_BINDING_NO_POPUP_STRATEGY_ID
    assert payload["has_popup"] is False
    assert payload["popup_body_source"] is None


# ─── has_popup=True path ─────────────────────────────────────────────


def test_bind_returns_inline_preview_with_details_when_has_popup_true():
    """u6 — feasible POPUP gate escalation flips the binder onto the
    ``inline_preview_with_details`` strategy (preview = px-budget
    excerpt downstream; popup body holds FULL original)."""
    plan = _stub_popup_plan()
    unit = _StubUnit(
        raw_content="MOCK_BODY",
        has_popup=True,
        popup_escalation_plan=plan,
    )
    payload = bind_popup_display_strategy(unit)
    assert payload["display_strategy"] == POPUP_BINDING_ESCALATED_STRATEGY_ID
    assert payload["has_popup"] is True
    assert payload["popup_escalation_plan"] is plan


def test_bind_popup_body_source_is_full_raw_content_verbatim():
    """u6 — popup body MUST be the FULL raw_content, byte-for-byte.
    The binder NEVER trims or summarizes (MDX 원문 무손실 보존 —
    오답노트 #5 / IMPROVEMENT-REDESIGN.md §3.6 line 110). u7 composes
    the body preview from container px telemetry downstream."""
    full_text = (
        "## MOCK_SECTION_TITLE\n\n"
        "- bullet one with **bold** marker\n"
        "- bullet two with *italic* marker\n"
        "- bullet three trailing\n"
        "\n"
        "| col_a | col_b |\n| --- | --- |\n| MOCK | DATA |\n"
    )
    unit = _StubUnit(
        raw_content=full_text,
        has_popup=True,
        popup_escalation_plan=_stub_popup_plan(),
    )
    payload = bind_popup_display_strategy(unit)
    assert payload["popup_body_source"] == full_text
    # Verbatim guarantee — no length-trimming side channel.
    assert len(payload["popup_body_source"]) == len(full_text)


def test_bind_detail_trigger_placement_and_label_come_from_catalog():
    """u6 — detail_trigger.placement / label MUST be read from the yaml
    catalog entry's detail_trigger block, not from code constants. This
    test compares the binder output against a fresh catalog read so a
    catalog rename (e.g., placement: top-right → top-left) propagates
    automatically."""
    catalog_trigger = (
        DISPLAY_STRATEGIES[POPUP_BINDING_ESCALATED_STRATEGY_ID]
        .get("detail_trigger") or {}
    )
    unit = _StubUnit(
        has_popup=True,
        popup_escalation_plan=_stub_popup_plan(),
    )
    payload = bind_popup_display_strategy(unit)
    assert payload["detail_trigger"] == {
        "placement": catalog_trigger.get("placement"),
        "label": catalog_trigger.get("label"),
    }


def test_bind_preserves_original_is_true_on_popup_path():
    """u6 — the popup-binding strategy MUST surface preserves_original=
    True so downstream consumers can rely on the absolute user lock
    (오답노트 #5). The binder mirrors the catalog value (which the
    catalog-side test already locks)."""
    unit = _StubUnit(
        has_popup=True,
        popup_escalation_plan=_stub_popup_plan(),
    )
    payload = bind_popup_display_strategy(unit)
    assert payload["preserves_original"] is True


def test_bind_strategy_meta_is_the_full_catalog_entry():
    """u6 — strategy_meta echoes the full catalog entry so downstream
    debug traces can self-explain without re-reading the yaml. Tests
    that the binder does not strip / re-shape the catalog dict."""
    expected_meta = DISPLAY_STRATEGIES[POPUP_BINDING_ESCALATED_STRATEGY_ID]
    unit = _StubUnit(
        has_popup=True,
        popup_escalation_plan=_stub_popup_plan(),
    )
    payload = bind_popup_display_strategy(unit)
    assert payload["strategy_meta"] is expected_meta


def test_bind_popup_escalation_plan_is_echoed_verbatim():
    """u6 — the popup_escalation_plan from u5 is echoed verbatim onto
    the zone payload so downstream debug surfaces can trace WHICH router
    category triggered the escalation (structural_major_overflow vs
    tabular_overflow). Object identity is preserved (no dict copy)."""
    plan = _stub_popup_plan("tabular_overflow")
    unit = _StubUnit(
        has_popup=True,
        popup_escalation_plan=plan,
    )
    payload = bind_popup_display_strategy(unit)
    assert payload["popup_escalation_plan"] is plan
    assert payload["popup_escalation_plan"]["category"] == "tabular_overflow"


# ─── Defensive guards ───────────────────────────────────────────────


def test_bind_raises_when_strategy_id_missing_from_catalog(monkeypatch):
    """u6 defensive guard — if catalog drift removes the escalated
    strategy id, the binder must raise RuntimeError rather than silently
    falling back to a wrong strategy. Locks the "yaml is source of
    truth" invariant against accidental rename."""
    drifted_catalog = {
        k: v for k, v in DISPLAY_STRATEGIES.items()
        if k != POPUP_BINDING_ESCALATED_STRATEGY_ID
    }
    monkeypatch.setattr(
        "src.phase_z2_composition.DISPLAY_STRATEGIES",
        drifted_catalog,
    )
    unit = _StubUnit(
        has_popup=True,
        popup_escalation_plan=_stub_popup_plan(),
    )
    with pytest.raises(RuntimeError, match="catalog drift"):
        bind_popup_display_strategy(unit)


def test_bind_raises_when_escalated_strategy_loses_preserves_original(
    monkeypatch,
):
    """u6 defensive guard — if the catalog entry for the escalated
    strategy ever flips preserves_original to False (yaml drift), the
    binder must raise RuntimeError. The absolute user lock — MDX 원문
    무손실 보존 — must NOT silently degrade through the binding layer."""
    drifted_meta = {
        **DISPLAY_STRATEGIES[POPUP_BINDING_ESCALATED_STRATEGY_ID],
        "preserves_original": False,
    }
    drifted_catalog = {
        **DISPLAY_STRATEGIES,
        POPUP_BINDING_ESCALATED_STRATEGY_ID: drifted_meta,
    }
    monkeypatch.setattr(
        "src.phase_z2_composition.DISPLAY_STRATEGIES",
        drifted_catalog,
    )
    unit = _StubUnit(
        has_popup=True,
        popup_escalation_plan=_stub_popup_plan(),
    )
    with pytest.raises(RuntimeError, match="preserves_original"):
        bind_popup_display_strategy(unit)


# ─── AI isolation contract (structural import lock) ─────────────────


def test_composition_module_does_not_import_anthropic_or_route_ai_fallback():
    """u6 — bind_popup_display_strategy MUST stay AI-free. Structural
    guard — composition module is allowed to consult the catalog and
    unit state, never the Anthropic SDK / route_ai_fallback path. This
    mirrors the import-isolation pattern locked by u5 tests in
    tests/phase_z2_ai_fallback/test_step17.py."""
    import src.phase_z2_composition as composition_module

    source = composition_module.__file__
    assert source is not None
    with open(source, encoding="utf-8") as f:
        text = f.read()
    assert "import anthropic" not in text
    assert "from anthropic" not in text
    assert "route_ai_fallback" not in text