"""Spike B tests — Magentic unbounded footgun (G1/B4) + fan-out state isolation (G2/B7).

These drive the real GA builders with the fake client (no endpoint), de-risked by the
Step 2 builder smoke. Pattern: tests/test_backends.py.
"""

from portfolio_optimiser.reference_domain import load_reference_projects
from spikes.b_footguns import (
    bounded_magentic_terminates,
    fresh_instance_call_counts,
    shared_instance_max_calls,
    unbounded_magentic_self_terminates,
)


async def test_unbounded_magentic_does_not_self_terminate() -> None:
    # max_round_count=None never finalizes — only the external guard stops it (B4).
    self_terminated = await unbounded_magentic_self_terminates(guard_rounds=8)
    assert self_terminated is False  # the guard fired, not a natural stop


async def test_bounded_magentic_terminates_within_limit() -> None:
    # An explicit max_round_count makes the same never-satisfied manager stop cleanly.
    assert await bounded_magentic_terminates(max_round_count=2) is True


async def test_shared_instance_bleeds_state_across_projects() -> None:
    ids = [p.id for p in load_reference_projects()]
    assert len(ids) == 3
    bled = await shared_instance_max_calls(ids)
    # One shared instance reused across all 3 projects -> calls accumulate -> bleed.
    assert bled == len(ids)


async def test_fresh_instance_zero_bleed_across_projects() -> None:
    ids = [p.id for p in load_reference_projects()]
    counts = await fresh_instance_call_counts(ids)
    # A fresh instance per project -> each run sees exactly one call -> zero bleed.
    assert counts == [1, 1, 1]