import importlib.util
from pathlib import Path


def _load_patterns_module():
    repo_root = Path(__file__).resolve().parents[1]
    module_path = repo_root / "workspace" / "code" / "led_patterns.py"
    spec = importlib.util.spec_from_file_location("led_patterns", module_path)
    module = importlib.util.module_from_spec(spec)
    assert spec is not None and spec.loader is not None
    spec.loader.exec_module(module)
    return module


def test_rainbow_frame_shape_and_bounds():
    patterns = _load_patterns_module()
    frame = patterns.rainbow_frame(12, 3)
    assert len(frame) == 12
    for color in frame:
        assert len(color) == 3
        assert all(0 <= c <= 255 for c in color)


def test_chase_frame_has_head_and_tail():
    patterns = _load_patterns_module()
    frame = patterns.chase_frame(8, 5, color=(10, 20, 30), tail=(1, 2, 3))
    assert len(frame) == 8
    assert frame[5] == (10, 20, 30)
    assert frame[4] == (1, 2, 3)
    assert sum(1 for c in frame if c != (0, 0, 0)) == 2


def test_twinkle_frame_is_deterministic_for_same_inputs():
    patterns = _load_patterns_module()
    a = patterns.twinkle_frame(20, frame=9, seed=777, sparkles=4)
    b = patterns.twinkle_frame(20, frame=9, seed=777, sparkles=4)
    assert a == b


def test_twinkle_frame_varies_between_frames():
    patterns = _load_patterns_module()
    a = patterns.twinkle_frame(20, frame=1, seed=777, sparkles=4)
    b = patterns.twinkle_frame(20, frame=2, seed=777, sparkles=4)
    assert a != b