from edge.health import parse_temp, parse_throttle, read_health


def test_parse_temp_reads_vcgencmd_output():
    assert parse_temp("temp=54.3'C\n") == 54.3


def test_parse_temp_returns_none_on_garbage():
    assert parse_temp("") is None
    assert parse_temp("no equals sign") is None


def test_parse_throttle_true_when_a_currently_active_bit_is_set():
    assert parse_throttle("throttled=0x4") is True     # bit2: currently throttled
    assert parse_throttle("throttled=0x1") is True     # bit0: under-voltage now


def test_parse_throttle_false_for_zero_and_for_past_only_latches():
    assert parse_throttle("throttled=0x0") is False
    # 0x50000 = bits 16,18 (under-voltage/throttle HAPPENED since boot) but nothing active now.
    assert parse_throttle("throttled=0x50000") is False


def test_parse_throttle_none_on_garbage():
    assert parse_throttle("throttled=notahexnum") is None


def test_read_health_returns_nones_off_pi_without_touching_subprocess():
    # No vcgencmd on the build machine / server: read_health must return Nones (never a fake 0)
    # and must NOT invoke the runner at all.
    calls = []
    out = read_health(run=lambda cmd: calls.append(cmd) or "", which=lambda name: None)
    assert out == {"temp": None, "throttle": None}
    assert calls == []


def test_read_health_parses_injected_vcgencmd_on_pi():
    def fake_run(cmd):
        return "temp=61.7'C\n" if "measure_temp" in cmd else "throttled=0x0\n"
    out = read_health(run=fake_run, which=lambda name: "/usr/bin/vcgencmd")
    assert out == {"temp": 61.7, "throttle": False}