"""Tests for device correlation engine."""

from datetime import datetime, timedelta
from unittest.mock import patch


class TestDeviceCorrelator:
    """Tests for DeviceCorrelator class."""

    def test_correlate_same_oui(self):
        """Test correlation detects same OUI."""
        from utils.correlation import DeviceCorrelator

        correlator = DeviceCorrelator(time_window_seconds=60)

        wifi_devices = {
            "AA:BB:CC:11:22:33": {
                "first_seen": datetime.now(),
                "last_seen": datetime.now(),
                "essid": "TestNetwork",
                "power": -65,
            }
        }

        bt_devices = {
            "AA:BB:CC:44:55:66": {
                "first_seen": datetime.now(),
                "last_seen": datetime.now(),
                "name": "TestPhone",
                "rssi": -60,
            }
        }

        correlations = correlator.correlate(wifi_devices, bt_devices)

        assert len(correlations) >= 1
        assert correlations[0]["wifi_mac"] == "AA:BB:CC:11:22:33"
        assert correlations[0]["bt_mac"] == "AA:BB:CC:44:55:66"
        assert correlations[0]["confidence"] > 0

    def test_correlate_timing(self):
        """Test correlation considers timing."""
        from utils.correlation import DeviceCorrelator

        correlator = DeviceCorrelator(time_window_seconds=30)
        now = datetime.now()

        # Devices appearing at the same time
        wifi_devices = {"11:22:33:44:55:66": {"first_seen": now, "last_seen": now, "essid": "Network1"}}

        bt_devices = {"77:88:99:AA:BB:CC": {"first_seen": now, "last_seen": now, "name": "Device1"}}

        correlations = correlator.correlate(wifi_devices, bt_devices)

        # Should have some confidence from timing correlation
        if correlations:
            assert correlations[0]["confidence"] > 0

    def test_correlate_no_overlap(self):
        """Test no correlation when devices don't overlap."""
        from utils.correlation import DeviceCorrelator

        correlator = DeviceCorrelator(time_window_seconds=30, min_confidence=0.6)

        now = datetime.now()
        old = now - timedelta(hours=1)

        wifi_devices = {"11:22:33:44:55:66": {"first_seen": old, "last_seen": old, "essid": "OldNetwork"}}

        bt_devices = {"77:88:99:AA:BB:CC": {"first_seen": now, "last_seen": now, "name": "NewDevice"}}

        correlations = correlator.correlate(wifi_devices, bt_devices)

        # With high min_confidence and no OUI match, should be empty
        assert len(correlations) == 0

    def test_correlate_manufacturer_match(self):
        """Test correlation boosts confidence for same manufacturer."""
        from utils.correlation import DeviceCorrelator

        correlator = DeviceCorrelator(time_window_seconds=60)
        now = datetime.now()

        wifi_devices = {
            "11:22:33:44:55:66": {"first_seen": now, "last_seen": now, "manufacturer": "Apple", "essid": "Network"}
        }

        bt_devices = {
            "77:88:99:AA:BB:CC": {"first_seen": now, "last_seen": now, "manufacturer": "Apple", "name": "iPhone"}
        }

        correlations = correlator.correlate(wifi_devices, bt_devices)

        # Should have correlation with bonus for manufacturer match
        assert len(correlations) >= 1

    def test_correlate_empty_inputs(self):
        """Test correlation handles empty inputs."""
        from utils.correlation import DeviceCorrelator

        correlator = DeviceCorrelator()

        # Empty WiFi
        assert correlator.correlate({}, {"AA:BB:CC:DD:EE:FF": {}}) == []

        # Empty Bluetooth
        assert correlator.correlate({"AA:BB:CC:DD:EE:FF": {}}, {}) == []

        # Both empty
        assert correlator.correlate({}, {}) == []

    def test_correlate_sorting(self):
        """Test correlations are sorted by confidence."""
        from utils.correlation import DeviceCorrelator

        correlator = DeviceCorrelator(time_window_seconds=60, min_confidence=0.0)
        now = datetime.now()

        wifi_devices = {
            "AA:BB:CC:11:11:11": {"first_seen": now, "last_seen": now, "manufacturer": "Apple"},
            "11:22:33:44:55:66": {"first_seen": now, "last_seen": now},
        }

        bt_devices = {
            "AA:BB:CC:22:22:22": {"first_seen": now, "last_seen": now, "manufacturer": "Apple"},
            "77:88:99:AA:BB:CC": {"first_seen": now, "last_seen": now},
        }

        correlations = correlator.correlate(wifi_devices, bt_devices)

        if len(correlations) >= 2:
            # Should be sorted by confidence (highest first)
            assert correlations[0]["confidence"] >= correlations[1]["confidence"]


class TestGetCorrelations:
    """Tests for get_correlations function."""

    @patch("utils.correlation.correlator")
    @patch("utils.correlation.db_get_correlations")
    def test_get_correlations_live(self, mock_db, mock_correlator):
        """Test get_correlations with live data."""
        from utils.correlation import get_correlations

        mock_correlator.correlate.return_value = [
            {"wifi_mac": "AA:AA:AA:AA:AA:AA", "bt_mac": "BB:BB:BB:BB:BB:BB", "confidence": 0.8}
        ]
        mock_db.return_value = []

        wifi = {"AA:AA:AA:AA:AA:AA": {}}
        bt = {"BB:BB:BB:BB:BB:BB": {}}

        results = get_correlations(wifi_devices=wifi, bt_devices=bt, include_historical=False)

        assert len(results) == 1
        mock_correlator.correlate.assert_called_once()

    @patch("utils.correlation.correlator")
    @patch("utils.correlation.db_get_correlations")
    def test_get_correlations_historical(self, mock_db, mock_correlator):
        """Test get_correlations includes historical data."""
        from utils.correlation import get_correlations

        mock_correlator.correlate.return_value = []
        mock_db.return_value = [
            {
                "wifi_mac": "CC:CC:CC:CC:CC:CC",
                "bt_mac": "DD:DD:DD:DD:DD:DD",
                "confidence": 0.7,
                "first_seen": "2024-01-01",
                "last_seen": "2024-01-02",
            }
        ]

        results = get_correlations(wifi_devices={}, bt_devices={}, include_historical=True)

        assert len(results) == 1
        assert results[0]["wifi_mac"] == "CC:CC:CC:CC:CC:CC"

    @patch("utils.correlation.correlator")
    @patch("utils.correlation.db_get_correlations")
    def test_get_correlations_deduplication(self, mock_db, mock_correlator):
        """Test get_correlations deduplicates live and historical."""
        from utils.correlation import get_correlations

        # Same correlation from both sources
        mock_correlator.correlate.return_value = [
            {"wifi_mac": "AA:AA:AA:AA:AA:AA", "bt_mac": "BB:BB:BB:BB:BB:BB", "confidence": 0.8}
        ]
        mock_db.return_value = [
            {
                "wifi_mac": "AA:AA:AA:AA:AA:AA",
                "bt_mac": "BB:BB:BB:BB:BB:BB",
                "confidence": 0.7,
                "first_seen": "2024-01-01",
                "last_seen": "2024-01-02",
            }
        ]

        wifi = {"AA:AA:AA:AA:AA:AA": {}}
        bt = {"BB:BB:BB:BB:BB:BB": {}}

        results = get_correlations(wifi_devices=wifi, bt_devices=bt, include_historical=True)

        # Should deduplicate - only one entry for the same device pair
        matching = [r for r in results if r["wifi_mac"] == "AA:AA:AA:AA:AA:AA"]
        assert len(matching) == 1


class TestCorrelationReason:
    """Tests for correlation reason generation."""

    def test_reason_same_oui(self):
        """Test reason includes OUI match."""
        from utils.correlation import DeviceCorrelator

        correlator = DeviceCorrelator()
        now = datetime.now()

        wifi_devices = {"AA:BB:CC:11:22:33": {"first_seen": now, "last_seen": now}}

        bt_devices = {"AA:BB:CC:44:55:66": {"first_seen": now, "last_seen": now}}

        correlations = correlator.correlate(wifi_devices, bt_devices)

        if correlations:
            assert "OUI" in correlations[0]["reason"] or "same" in correlations[0]["reason"].lower()

    def test_reason_timing(self):
        """Test reason includes timing information."""
        from utils.correlation import DeviceCorrelator

        correlator = DeviceCorrelator(time_window_seconds=60)
        now = datetime.now()

        wifi_devices = {"11:22:33:44:55:66": {"first_seen": now, "last_seen": now}}

        bt_devices = {
            "77:88:99:AA:BB:CC": {"first_seen": now + timedelta(seconds=5), "last_seen": now + timedelta(seconds=5)}
        }

        correlations = correlator.correlate(wifi_devices, bt_devices)

        # If correlation found, should mention timing
        if correlations and correlations[0]["confidence"] > 0.3:
            assert "appeared" in correlations[0]["reason"] or "timing" in correlations[0]["reason"]