import importlib.util
from pathlib import Path


RUNNER_PATH = Path(__file__).parents[1] / "scripts" / "mp3_player_device_runner.py"


def load_runner():
    spec = importlib.util.spec_from_file_location("mp3_player_device_runner", RUNNER_PATH)
    module = importlib.util.module_from_spec(spec)
    assert spec.loader is not None
    spec.loader.exec_module(module)
    return module


def test_resume_trace_requires_playback_persistence_and_same_path_resume():
    runner = load_runner()
    fixture = "/sdcard/download/test.mp3"
    trace = "\n".join(
        [
            "I Mp3Player: Starting MP3 playback: /sdcard/download/test.mp3 (size: 480000 bytes) resume=0",
            "I Mp3Player: Audio stream opened: 16000 Hz, 1 channels",
            "I Mp3Player: History saved on hide: /sdcard/download/test.mp3 pos 9 total 30",
            "I Mp3Player: Resuming last play /sdcard/download/test.mp3 at 9 sec from history",
            "I Mp3Player: Starting MP3 playback: /sdcard/download/test.mp3 (size: 480000 bytes) resume=9",
        ]
    )

    result = runner.evaluate_resume_trace(trace, fixture, minimum_position=6)

    assert result == {"persisted_position": 9, "resumed_position": 9}


def test_resume_trace_rejects_a_different_file_or_no_playback_evidence():
    runner = load_runner()
    fixture = "/sdcard/download/test.mp3"

    try:
        runner.evaluate_resume_trace(
            "I Mp3Player: Starting MP3 playback: /sdcard/other.mp3 (size: 1 bytes) resume=0",
            fixture,
            minimum_position=6,
        )
    except RuntimeError as exc:
        assert "playback" in str(exc).lower()
    else:
        raise AssertionError("missing playback evidence must fail")


def test_resume_trace_rejects_forced_playback_task_termination():
    runner = load_runner()
    fixture = "/sdcard/download/test.mp3"
    trace = "\n".join(
        [
            f"I Mp3Player: Starting MP3 playback: {fixture} (size: 480000 bytes) resume=0",
            "I Mp3Player: Audio stream opened: 16000 Hz, 1 channels",
            f"I Mp3Player: History saved on hide: {fixture} pos 9 total 180",
            "W Mp3Player: Playback task stuck, force deleting",
            f"I Mp3Player: Resuming last play {fixture} at 9 sec from history",
            f"I Mp3Player: Starting MP3 playback: {fixture} (size: 480000 bytes) resume=9",
        ]
    )

    try:
        runner.evaluate_resume_trace(trace, fixture, minimum_position=6)
    except RuntimeError as exc:
        assert "forced" in str(exc).lower()
    else:
        raise AssertionError("forced task termination must fail the device test")