"""IMP-33 u1 — AI fallback Settings defaults (locked).

These defaults are the binding contract from Stage 2 plan (per-unit u1):
  - ai_fallback_enabled        = False        (master flag OFF; fallback path only)
  - ai_fallback_model          = "claude-opus-4-7"
  - ai_fallback_timeout_s      = 60.0
  - ai_fallback_max_retries    = 3
  - ai_fallback_backoff_base_s = 1.0
  - ai_fallback_backoff_cap_s  = 8.0
  - ai_fallback_backoff_jitter = 0.3
  - ai_fallback_budget_per_run = 10
  - ai_fallback_circuit_breaker_threshold = 5

Downstream u4 (client) MUST source timeout/retry/backoff/budget/circuit from
Settings; inline literals are forbidden by Stage 2 plan.
"""
from __future__ import annotations

from src.config import Settings


def test_ai_fallback_master_flag_default_off() -> None:
    s = Settings()
    assert s.ai_fallback_enabled is False, (
        "AI fallback master flag MUST default OFF (normal path AI=0 contract)."
    )


def test_ai_fallback_model_default_locked() -> None:
    s = Settings()
    assert s.ai_fallback_model == "claude-opus-4-7"


def test_ai_fallback_retry_timeout_backoff_defaults_locked() -> None:
    s = Settings()
    assert s.ai_fallback_timeout_s == 60.0
    assert s.ai_fallback_max_retries == 3
    assert s.ai_fallback_backoff_base_s == 1.0
    assert s.ai_fallback_backoff_cap_s == 8.0
    assert s.ai_fallback_backoff_jitter == 0.3


def test_ai_fallback_budget_and_circuit_defaults_locked() -> None:
    s = Settings()
    assert s.ai_fallback_budget_per_run == 10
    assert s.ai_fallback_circuit_breaker_threshold == 5


# IMP-46 u5 — auto-cache opt-in setting default lock.
# The CLI flag ``--auto-cache`` in src/phase_z2_pipeline.py mutates this
# setting at parse time. The default MUST stay OFF so the dual-gate
# contract (visual_check_passed AND user_approved) survives without an
# explicit operator opt-in.


def test_ai_fallback_auto_cache_default_off() -> None:
    s = Settings()
    assert s.ai_fallback_auto_cache is False, (
        "IMP-46 u5 auto-cache MUST default OFF; the dual-gate contract "
        "(visual_check_passed AND user_approved) survives without an "
        "explicit --auto-cache opt-in."
    )


# IMP-47B u1 — reject route hint policy correction.
# Prior to 2026-05-21 the reject V4 label routed to ``design_reference_only``
# (no AI). The user policy correction (issue #76) reroutes reject to
# ``ai_adaptation_required`` so the rank-1 reject frame is kept and the AI
# re-maps MDX content into its declared slots. Activation remains gated by
# ``ai_fallback_enabled`` (default OFF preserves the normal-path AI=0
# contract — see test_ai_fallback_master_flag_default_off above).


def test_reject_route_hint_routes_to_ai_adaptation() -> None:
    from src.phase_z2_pipeline import _IMP05_ROUTE_HINTS, _imp05_route_hint

    assert _IMP05_ROUTE_HINTS["reject"] == "ai_adaptation_required", (
        "IMP-47B u1: reject must route to ai_adaptation_required so the "
        "rank-1 reject frame is retained and AI re-maps MDX content into "
        "its slots (frame auto-swap forbidden)."
    )
    assert _imp05_route_hint("reject") == "ai_adaptation_required"
    # Sibling routes unchanged — guardrail against accidental drift.
    assert _imp05_route_hint("use_as_is") == "direct_render"
    assert _imp05_route_hint("light_edit") == "deterministic_minor_adjustment"
    assert _imp05_route_hint("restructure") == "ai_adaptation_required"