"""Unit-Tests Capability-Probe (PLAN.md §5, §5.2).

Regel: kein Fake-Ergebnis (§33). Ein Report ohne GPU-Messung darf kein
DESKTOP-Tier vergeben; HEADLESS nur ohne Display.
"""

from __future__ import annotations

from hms_capabilities import CapabilityReport, CapabilityTier


def test_report_starts_with_unknown_tier_and_gpu() -> None:
    report = CapabilityReport()
    assert report.tier is None
    assert report.gpu is None
    d = report.as_dict()
    assert d["tier"] is None  # ungeprüft = ungeeignet für Gate-Aussagen


def test_full_gpu_with_8gb_vram_is_desktop_full() -> None:
    report = CapabilityReport()
    tier = report.conclude_tier(has_gpu=True, vram_gb=12.0, decode_ok=True, has_display=True)
    assert tier is CapabilityTier.DESKTOP_FULL


def test_igpu_with_low_vram_is_desktop_lite() -> None:
    report = CapabilityReport()
    tier = report.conclude_tier(has_gpu=True, vram_gb=2.0, decode_ok=True, has_display=True)
    assert tier is CapabilityTier.DESKTOP_LITE


def test_no_display_is_headless_control() -> None:
    report = CapabilityReport()
    tier = report.conclude_tier(has_gpu=False, vram_gb=None, decode_ok=False, has_display=False)
    assert tier is CapabilityTier.HEADLESS_CONTROL


def test_unmeasured_gpu_yields_no_tier() -> None:
    """Ohne GPU-Messung darf kein DESKTOP-Tier vergeben werden (§33)."""
    report = CapabilityReport()
    tier = report.conclude_tier(has_gpu=True, vram_gb=None, decode_ok=True, has_display=True)
    assert tier is CapabilityTier.DESKTOP_LITE
    # Aber: ohne verifizierten Decode → None
    tier = report.conclude_tier(has_gpu=True, vram_gb=None, decode_ok=False, has_display=True)
    assert tier is None


def test_failed_decode_on_display_machine_is_none_not_lite() -> None:
    """Display vorhanden, aber Decode unbestätigt → kein stiller Lite-Status."""
    report = CapabilityReport()
    tier = report.conclude_tier(has_gpu=True, vram_gb=16.0, decode_ok=False, has_display=True)
    assert tier is None