from __future__ import annotations

import importlib.util
from pathlib import Path

ROOT = Path(__file__).resolve().parents[2]
SCRIPT = ROOT / "scripts" / "check_critical_coverage.py"


def _module():
    spec = importlib.util.spec_from_file_location("check_critical_coverage", SCRIPT)
    assert spec and spec.loader
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module


def test_critical_coverage_gate_rejects_missing_and_below_threshold() -> None:
    module = _module()
    report = {"files": {}}
    errors = module.validate(report)
    assert len(errors) == len(module.THRESHOLDS)

    report = {
        "files": {
            path: {"summary": {"percent_covered": threshold - 0.01}}
            for path, threshold in module.THRESHOLDS.items()
        }
    }
    assert len(module.validate(report)) == len(module.THRESHOLDS)


def test_critical_coverage_gate_accepts_thresholds() -> None:
    module = _module()
    report = {
        "files": {
            path: {"summary": {"percent_covered": threshold}}
            for path, threshold in module.THRESHOLDS.items()
        }
    }
    assert module.validate(report) == []