"""
Unit tests for controller.lib.smart module.
"""

from unittest import mock

from controller.lib.smart import (
    is_smart_available,
    get_all_smart_status,
    build_smart_stats,
    _get_device_smart,
    _get_temperature,
    _get_attribute,
    _drive_is_asleep,
    HDD_HIGH_TEMPERATURE,
    HDD_CRITICAL_TEMPERATURE,
)


class TestIsSmartAvailable:
    """Tests for is_smart_available function."""

    def test_returns_false_in_docker_mode(self):
        """Should return False in Docker mode."""
        with mock.patch("controller.lib.smart.is_docker_mode", return_value=True):
            assert is_smart_available() is False

    def test_returns_false_when_pysmart_not_installed(self):
        """Should return False when pySMART not installed."""
        with mock.patch("controller.lib.smart.is_docker_mode", return_value=False):
            with mock.patch("controller.lib.smart.SMART_AVAILABLE", False):
                assert is_smart_available() is False

    def test_returns_true_when_available(self):
        """Should return True when pySMART available and not Docker."""
        with mock.patch("controller.lib.smart.is_docker_mode", return_value=False):
            with mock.patch("controller.lib.smart.SMART_AVAILABLE", True):
                assert is_smart_available() is True


class TestGetAllSmartStatus:
    """Tests for get_all_smart_status function."""

    def test_returns_empty_when_not_available(self):
        """Should return empty list when SMART not available."""
        with mock.patch("controller.lib.smart.is_smart_available", return_value=False):
            result = get_all_smart_status()
            assert result == []

    def test_returns_device_list(self):
        """Should return list of device statuses."""
        mock_device = mock.Mock()
        mock_device.name = "sda"
        mock_device.model = "Samsung SSD"
        mock_device.serial = "S1234"
        mock_device.capacity = "500 GB"
        mock_device.assessment = "PASS"
        mock_device.smart_enabled = True
        mock_device.attributes = []

        mock_device_list = mock.Mock()
        mock_device_list.devices = [mock_device]

        with mock.patch("controller.lib.smart.is_smart_available", return_value=True):
            with mock.patch("controller.lib.smart.DeviceList", return_value=mock_device_list):
                result = get_all_smart_status()
                assert len(result) == 1
                assert result[0]["device"] == "sda"
                assert result[0]["model"] == "Samsung SSD"


class TestGetDeviceSmart:
    """Tests for _get_device_smart function."""

    def test_extracts_device_info(self):
        """Should extract device information."""
        mock_device = mock.Mock()
        mock_device.name = "sda"
        mock_device.model = "Samsung SSD"
        mock_device.serial = "S1234"
        mock_device.capacity = "500 GB"
        mock_device.assessment = "PASS"
        mock_device.smart_enabled = True
        mock_device.attributes = []

        result = _get_device_smart(mock_device)
        assert result["device"] == "sda"
        assert result["path"] == "/dev/sda"
        assert result["model"] == "Samsung SSD"
        assert result["serial"] == "S1234"
        assert result["capacity"] == "500 GB"
        assert result["assessment"] == "PASS"
        assert result["smart_enabled"] is True


class TestGetTemperature:
    """Tests for _get_temperature function."""

    def test_returns_temperature_celsius(self):
        """Should return temperature from Temperature_Celsius attribute."""
        mock_attr = mock.Mock()
        mock_attr.name = "Temperature_Celsius"
        mock_attr.raw = "35"

        mock_device = mock.Mock()
        mock_device.attributes = [mock_attr]

        result = _get_temperature(mock_device)
        assert result == 35

    def test_falls_back_to_airflow_temperature(self):
        """Should fall back to Airflow_Temperature_Cel."""
        mock_attr = mock.Mock()
        mock_attr.name = "Airflow_Temperature_Cel"
        mock_attr.raw = "40"

        mock_device = mock.Mock()
        mock_device.attributes = [mock_attr]

        result = _get_temperature(mock_device)
        assert result == 40

    def test_returns_none_if_not_found(self):
        """Should return None if no temperature attribute."""
        mock_device = mock.Mock()
        mock_device.temperature = None
        mock_device.attributes = []

        result = _get_temperature(mock_device)
        assert result is None

    def test_prefers_pysmart_temperature_property(self):
        """Real drives report raw values like '52 (Min/Max 16/57)' which
        int() cannot parse; pySMART's temperature property handles them."""
        mock_attr = mock.Mock()
        mock_attr.name = "Temperature_Celsius"
        mock_attr.raw = "52 (Min/Max 16/57)"

        mock_device = mock.Mock()
        mock_device.temperature = 52
        mock_device.attributes = [mock_attr]

        result = _get_temperature(mock_device)
        assert result == 52

    def test_pysmart_temperature_property_for_nvme(self):
        """NVMe devices have no ATA attribute table, only the property."""
        mock_device = mock.Mock()
        mock_device.temperature = 38
        mock_device.attributes = None

        result = _get_temperature(mock_device)
        assert result == 38

    def test_ignores_non_int_temperature_property(self):
        """A missing/bogus temperature property falls back to attributes."""
        mock_attr = mock.Mock()
        mock_attr.name = "Temperature_Celsius"
        mock_attr.raw = "35"

        mock_device = mock.Mock()  # .temperature is a Mock, not an int
        mock_device.attributes = [mock_attr]

        result = _get_temperature(mock_device)
        assert result == 35


class TestGetAttribute:
    """Tests for _get_attribute function."""

    def test_returns_attribute_value(self):
        """Should return attribute raw value."""
        mock_attr = mock.Mock()
        mock_attr.name = "Power_On_Hours"
        mock_attr.raw = "12345"

        mock_device = mock.Mock()
        mock_device.attributes = [mock_attr]

        result = _get_attribute(mock_device, "Power_On_Hours")
        assert result == 12345

    def test_returns_none_for_missing_attribute(self):
        """Should return None if attribute not found."""
        mock_device = mock.Mock()
        mock_device.attributes = []

        result = _get_attribute(mock_device, "Nonexistent")
        assert result is None

    def test_returns_none_if_no_attributes(self):
        """Should return None if device has no attributes."""
        mock_device = mock.Mock()
        mock_device.attributes = None

        result = _get_attribute(mock_device, "Power_On_Hours")
        assert result is None

    def test_handles_invalid_raw_value(self):
        """Should handle non-numeric raw values."""
        mock_attr = mock.Mock()
        mock_attr.name = "Power_On_Hours"
        mock_attr.raw = "invalid"

        mock_device = mock.Mock()
        mock_device.attributes = [mock_attr]

        result = _get_attribute(mock_device, "Power_On_Hours")
        assert result is None


class TestDriveIsAsleep:
    """Tests for _drive_is_asleep function (smartctl -n standby)."""

    def test_returns_true_for_standby(self):
        completed = mock.Mock(stdout="Device is in STANDBY mode, exit(2)\n")
        with mock.patch("controller.lib.smart.subprocess.run", return_value=completed):
            assert _drive_is_asleep("/dev/sda") is True

    def test_returns_true_for_sleep(self):
        # smartctl -n standby also bails on the deeper SLEEP power mode;
        # that drive must NOT be woken for a read either.
        completed = mock.Mock(stdout="Device is in SLEEP mode, exit(2)\n")
        with mock.patch("controller.lib.smart.subprocess.run", return_value=completed):
            assert _drive_is_asleep("/dev/sda") is True

    def test_returns_false_for_active(self):
        # A normal `-i` read on an awake drive never mentions STANDBY.
        completed = mock.Mock(stdout="Model Family: WDC\nDevice Model: WD100EMAZ\n")
        with mock.patch("controller.lib.smart.subprocess.run", return_value=completed):
            assert _drive_is_asleep("/dev/sda") is False

    def test_returns_false_on_error(self):
        """smartctl missing / errors out → treat as awake (safe fallback)."""
        with mock.patch("controller.lib.smart.subprocess.run",
                        side_effect=OSError("boom")):
            assert _drive_is_asleep("/dev/sda") is False


class TestBuildSmartStats:
    """Tests for build_smart_stats — the navbar/Disk Management payload."""

    def test_returns_thresholds_when_unavailable(self):
        """Docker / no pySMART → empty drive list but thresholds present."""
        with mock.patch("controller.lib.smart.is_smart_available", return_value=False):
            stats = build_smart_stats()
        assert stats["drives"] == []
        assert stats["high_temperature"] == HDD_HIGH_TEMPERATURE
        assert stats["critical_temperature"] == HDD_CRITICAL_TEMPERATURE

    def test_reads_awake_drives(self):
        fake_device = mock.Mock()
        fake_device.name = "sda"
        fake_device.model = "WDC WD100EMAZ"
        fake_device.serial = "S1"
        fake_device.capacity = "10.0 TB"
        fake_device.assessment = "PASS"
        fake_device.smart_enabled = True
        fake_device.temperature = 52
        fake_device.attributes = []

        with mock.patch("controller.lib.smart.is_smart_available", return_value=True), \
                mock.patch("controller.lib.smart._scan_devices",
                           return_value=[("/dev/sda", "sat")]), \
                mock.patch("controller.lib.smart._drive_is_asleep", return_value=False), \
                mock.patch("controller.lib.smart.Device", return_value=fake_device) as Dev:
            stats = build_smart_stats()

        Dev.assert_called_once_with("/dev/sda", interface="sat")
        assert len(stats["drives"]) == 1
        assert stats["drives"][0]["device"] == "sda"
        assert stats["drives"][0]["temperature"] == 52

    def test_sleeping_drive_is_not_read_and_reuses_previous(self):
        """A standby drive must NOT be read (would wake it); reuse old data."""
        previous = {
            "drives": [{"device": "sda", "path": "/dev/sda", "temperature": 49}],
            "high_temperature": HDD_HIGH_TEMPERATURE,
            "critical_temperature": HDD_CRITICAL_TEMPERATURE,
        }
        with mock.patch("controller.lib.smart.is_smart_available", return_value=True), \
                mock.patch("controller.lib.smart._scan_devices",
                           return_value=[("/dev/sda", "sat")]), \
                mock.patch("controller.lib.smart._drive_is_asleep", return_value=True), \
                mock.patch("controller.lib.smart.Device") as Dev:
            stats = build_smart_stats(previous=previous)

        Dev.assert_not_called()
        assert stats["drives"] == [{"device": "sda", "path": "/dev/sda", "temperature": 49}]

    def test_sleeping_drive_without_previous_is_skipped(self):
        """Standby drive with no prior reading is simply omitted (not hot)."""
        with mock.patch("controller.lib.smart.is_smart_available", return_value=True), \
                mock.patch("controller.lib.smart._scan_devices",
                           return_value=[("/dev/sda", "sat")]), \
                mock.patch("controller.lib.smart._drive_is_asleep", return_value=True), \
                mock.patch("controller.lib.smart.Device") as Dev:
            stats = build_smart_stats(previous=None)

        Dev.assert_not_called()
        assert stats["drives"] == []