from __future__ import annotations

import pytest

from arbitrade.risk.stop_conditions import StopConditionsGuard


def test_stop_conditions_guard_halts_on_source_latency_breach() -> None:
    guard = StopConditionsGuard(max_source_latency_ms=50.0)

    guard.observe_latency(source_latency_ms=75.0, apply_latency_ms=1.0)

    assert guard.is_halted
    assert guard.halted_reason == "source_latency_limit_breached"


def test_stop_conditions_guard_halts_on_apply_latency_breach() -> None:
    guard = StopConditionsGuard(max_apply_latency_ms=2.0)

    guard.observe_latency(source_latency_ms=None, apply_latency_ms=3.5)

    assert guard.is_halted
    assert guard.halted_reason == "apply_latency_limit_breached"


def test_stop_conditions_guard_halts_on_consecutive_failures() -> None:
    guard = StopConditionsGuard(max_consecutive_failures=2)

    guard.register_failure()
    assert not guard.is_halted

    guard.register_failure()

    assert guard.is_halted
    assert guard.halted_reason == "consecutive_failures_limit_breached"


def test_stop_conditions_guard_resets_failures_after_success() -> None:
    guard = StopConditionsGuard(max_consecutive_failures=3)

    guard.register_failure()
    guard.register_success()
    guard.register_failure()

    assert guard.consecutive_failures == 1
    assert not guard.is_halted


def test_stop_conditions_guard_rejects_invalid_configuration() -> None:
    with pytest.raises(ValueError, match="max_source_latency_ms"):
        StopConditionsGuard(max_source_latency_ms=0.0)

    with pytest.raises(ValueError, match="max_apply_latency_ms"):
        StopConditionsGuard(max_apply_latency_ms=-1.0)

    with pytest.raises(ValueError, match="max_consecutive_failures"):
        StopConditionsGuard(max_consecutive_failures=0)