"""Tests for security change detection system.

This module tests the SecurityChangeDetector that compares security findings
over time and identifies changes in vulnerability status.
"""

from __future__ import annotations

from datetime import date
from unittest.mock import Mock

import pytest

from security.models import SecurityFinding


class TestSecurityChangeDetector:
    """Test cases for SecurityChangeDetector."""

    def test_security_change_detector_import(self) -> None:
        """Test that SecurityChangeDetector can be imported."""
        from scripts.security_change_detector import SecurityChangeDetector

        # Mock the datastore to avoid directory creation
        mock_datastore = Mock()
        detector = SecurityChangeDetector(datastore=mock_datastore)
        assert detector is not None

    def test_detect_new_vulnerabilities(self) -> None:
        """Test detection of new vulnerabilities."""
        from scripts.release_automation_engine import SecurityChangeType
        from scripts.security_change_detector import SecurityChangeDetector

        # Mock the datastore to avoid directory creation
        mock_datastore = Mock()
        detector = SecurityChangeDetector(datastore=mock_datastore)

        # Previous findings (empty)
        previous_findings = []

        # Current findings (new vulnerability)
        current_findings = [
            SecurityFinding(
                finding_id="CVE-2025-NEW",
                package="test-package",
                version="1.0.0",
                severity="high",
                source_scanner="pip-audit",
                discovered_date=date.today(),
                description="New vulnerability",
                impact="High impact",
                fix_available=False,
            )
        ]

        changes = detector.detect_changes(previous_findings, current_findings)

        assert len(changes) == 1
        assert changes[0].change_type == SecurityChangeType.NEW_VULNERABILITY
        assert changes[0].finding_id == "CVE-2025-NEW"
        assert changes[0].impact_level == "high"

    def test_detect_resolved_vulnerabilities(self) -> None:
        """Test detection of resolved vulnerabilities."""
        from scripts.release_automation_engine import SecurityChangeType
        from scripts.security_change_detector import SecurityChangeDetector

        # Mock the datastore to avoid directory creation
        mock_datastore = Mock()
        detector = SecurityChangeDetector(datastore=mock_datastore)

        # Previous findings (has vulnerability)
        previous_findings = [
            SecurityFinding(
                finding_id="CVE-2025-RESOLVED",
                package="test-package",
                version="1.0.0",
                severity="medium",
                source_scanner="pip-audit",
                discovered_date=date.today(),
                description="Resolved vulnerability",
                impact="Medium impact",
                fix_available=True,
            )
        ]

        # Current findings (vulnerability resolved - empty)
        current_findings = []

        changes = detector.detect_changes(previous_findings, current_findings)

        assert len(changes) == 1
        assert changes[0].change_type == SecurityChangeType.RESOLVED_VULNERABILITY
        assert changes[0].finding_id == "CVE-2025-RESOLVED"
        assert changes[0].impact_level == "medium"

    def test_detect_severity_changes(self) -> None:
        """Test detection of severity changes."""
        from scripts.release_automation_engine import SecurityChangeType
        from scripts.security_change_detector import SecurityChangeDetector

        # Mock the datastore to avoid directory creation
        mock_datastore = Mock()
        detector = SecurityChangeDetector(datastore=mock_datastore)

        # Previous findings (medium severity)
        previous_findings = [
            SecurityFinding(
                finding_id="CVE-2025-SEVERITY",
                package="test-package",
                version="1.0.0",
                severity="medium",
                source_scanner="pip-audit",
                discovered_date=date.today(),
                description="Severity change vulnerability",
                impact="Medium impact",
                fix_available=False,
            )
        ]

        # Current findings (high severity)
        current_findings = [
            SecurityFinding(
                finding_id="CVE-2025-SEVERITY",
                package="test-package",
                version="1.0.0",
                severity="high",
                source_scanner="pip-audit",
                discovered_date=date.today(),
                description="Severity change vulnerability",
                impact="High impact",
                fix_available=False,
            )
        ]

        changes = detector.detect_changes(previous_findings, current_findings)

        assert len(changes) == 1
        assert changes[0].change_type == SecurityChangeType.SEVERITY_CHANGE
        assert changes[0].finding_id == "CVE-2025-SEVERITY"
        assert changes[0].impact_level == "high"
        assert changes[0].old_state == "medium vulnerability"
        assert changes[0].new_state == "high vulnerability"

    def test_no_changes_detected(self) -> None:
        """Test when no changes are detected."""
        from scripts.security_change_detector import SecurityChangeDetector

        # Mock the datastore to avoid directory creation
        mock_datastore = Mock()
        detector = SecurityChangeDetector(datastore=mock_datastore)

        # Identical findings
        finding = SecurityFinding(
            finding_id="CVE-2025-SAME",
            package="test-package",
            version="1.0.0",
            severity="medium",
            source_scanner="pip-audit",
            discovered_date=date.today(),
            description="Unchanged vulnerability",
            impact="Medium impact",
            fix_available=False,
        )

        previous_findings = [finding]
        current_findings = [finding]

        changes = detector.detect_changes(previous_findings, current_findings)

        assert len(changes) == 0


class TestSecurityFindingsIntegration:
    """Test integration with Phase 6 security findings system."""

    def test_load_findings_from_phase6_system(self) -> None:
        """Test loading findings from Phase 6 security system."""
        pytest.skip("Integration test - implementation pending")

    def test_integrate_with_remediation_registry(self) -> None:
        """Test integration with remediation registry."""
        pytest.skip("Integration test - implementation pending")

    def test_historical_findings_comparison(self) -> None:
        """Test comparison with historical findings data."""
        pytest.skip("Integration test - implementation pending")
