import pytest
import tempfile
from pathlib import Path
from log_handler import core


@pytest.fixture
def sample_log_file(tmp_path: Path) -> Path:
    sample_content = ("""2024-05-01 23:45:01, Temp=14.5C, SensorTemp=36.2C\n"""
                      "2024-05-01 23:50:01, Temp=14.7C, SensorTemp=36.4C\n"""
                      "Irrelevante Zeile ohne Daten\n"""
                      "2024-05-01 23:55:01, Temp=14.8C, SensorTemp=36.6C\n")
    file_path = tmp_path / "sample_log.log"
    file_path.write_text(sample_content)
    return file_path


def test_parse_log_file_returns_list(sample_log_file: Path):
    result = core.parse_log_file(str(sample_log_file))
    assert isinstance(result, list)
    assert all(hasattr(r, "timestamp") for r in result)
    assert all(hasattr(r, "temperature") for r in result)
    assert all(hasattr(r, "sensor_temp") for r in result)


def test_parse_log_file_correct_values(sample_log_file: Path):
    result = core.parse_log_file(str(sample_log_file))
    assert len(result) == 3
    first = result[0]
    assert first.timestamp.startswith("2024-05-01 23:45")
    assert 10.0 < first.temperature < 20.0
    assert 30.0 < first.sensor_temp < 40.0


def test_parse_log_file_handles_invalid_lines(tmp_path: Path):
    corrupted_file = tmp_path / "bad.log"
    corrupted_file.write_text("no valid data here\n")
    result = core.parse_log_file(str(corrupted_file))
    assert isinstance(result, list)
    assert result == []


def test_parse_log_file_invalid_input_type():
    with pytest.raises((TypeError, FileNotFoundError)):
        core.parse_log_file(None)  # type: ignore


def test_parse_log_file_nonexistent_file():
    with pytest.raises(FileNotFoundError):
        core.parse_log_file("./does_not_exist.log")


def test_data_integrity_fields(sample_log_file: Path):
    result = core.parse_log_file(str(sample_log_file))
    for entry in result:
        assert isinstance(entry.timestamp, str)
        assert isinstance(entry.temperature, float)
        assert isinstance(entry.sensor_temp, float)


def test_parse_log_file_output_consistency(sample_log_file: Path):
    result1 = core.parse_log_file(str(sample_log_file))
    result2 = core.parse_log_file(str(sample_log_file))
    assert result1 == result2