from __future__ import annotations

from pathlib import Path

from sync_state_machine.engine import StateMachineConfig


CFG_PATH = Path(__file__).resolve().parents[2] / "sync_state_machine" / "config" / "node_state_machine.yaml"


def test_state_and_event_coverage_contract() -> None:
    cfg = StateMachineConfig.load(CFG_PATH)

    transitions = cfg.raw.get("transitions", {})
    states = cfg.raw.get("states", {})
    pseudo_states = cfg.raw.get("pseudo_states", {})

    all_events = set(transitions.keys()) if isinstance(transitions, dict) else set()
    assert all_events == set(cfg.transitions.keys())

    touched_states: set[str] = set()
    for transition in cfg.transitions.values():
        touched_states.update(s for s in transition.from_states if s != "*")
        for outcome in transition.outcomes:
            if outcome.to:
                touched_states.add(outcome.to)

    declared_states = set(states.keys()) | set(pseudo_states.keys())
    # 允许仅作为注释阶段使用的状态极少数暂不触发，但要求覆盖率至少95%
    coverage = len(touched_states & declared_states) / max(1, len(declared_states))
    assert coverage >= 0.95