// Chicago TDD Tests for Compliance & Audit System
// Comprehensive test suite with ≤2ns budget validation

#[cfg(test)]
mod compliance_audit_tests {
    use std::time::Instant;

    struct TestAuditEvent {
        event_id: String,
        event_type: String,
        actor: String,
        action: String,
        outcome: String,
    }

    struct TestPolicy {
        policy_id: String,
        policy_name: String,
        framework: String,
        version: String,
    }

    struct TestViolation {
        violation_id: String,
        policy_id: String,
        severity: String,
    }

    struct TestIncident {
        incident_id: String,
        severity: String,
        affected_records: u64,
    }

    // ==================== Audit Event Tests ====================

    #[test]
    fn test_audit_event_creation() {
        let start = Instant::now();

        let event = TestAuditEvent {
            event_id: "evt-001".to_string(),
            event_type: "user_action".to_string(),
            actor: "user-123".to_string(),
            action: "login".to_string(),
            outcome: "success".to_string(),
        };

        assert_eq!(event.event_id, "evt-001");
        assert_eq!(event.actor, "user-123");

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    #[test]
    fn test_event_types() {
        let start = Instant::now();

        let types = vec!["user_action", "system_event", "security_event", "data_access", "config_change"];

        for event_type in types {
            let event = TestAuditEvent {
                event_id: format!("evt-{}", event_type),
                event_type: event_type.to_string(),
                actor: "system".to_string(),
                action: "test".to_string(),
                outcome: "success".to_string(),
            };

            assert_eq!(event.event_type, event_type);
        }

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    // ==================== Policy Tests ====================

    #[test]
    fn test_policy_creation() {
        let start = Instant::now();

        let policy = TestPolicy {
            policy_id: "pol-001".to_string(),
            policy_name: "Data Retention Policy".to_string(),
            framework: "GDPR".to_string(),
            version: "1.0".to_string(),
        };

        assert_eq!(policy.policy_id, "pol-001");
        assert_eq!(policy.framework, "GDPR");

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    #[test]
    fn test_compliance_frameworks() {
        let start = Instant::now();

        let frameworks = vec!["SOX", "GDPR", "HIPAA", "SOC2", "PCI-DSS", "ISO27001"];

        for framework in frameworks {
            let policy = TestPolicy {
                policy_id: format!("pol-{}", framework),
                policy_name: format!("{} Policy", framework),
                framework: framework.to_string(),
                version: "1.0".to_string(),
            };

            assert_eq!(policy.framework, framework);
        }

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    // ==================== Violation Tests ====================

    #[test]
    fn test_violation_detection() {
        let start = Instant::now();

        let violation = TestViolation {
            violation_id: "viol-001".to_string(),
            policy_id: "pol-001".to_string(),
            severity: "high".to_string(),
        };

        assert_eq!(violation.violation_id, "viol-001");
        assert_eq!(violation.severity, "high");

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    #[test]
    fn test_severity_levels() {
        let start = Instant::now();

        let severities = vec!["low", "medium", "high", "critical"];

        for (i, severity) in severities.iter().enumerate() {
            let violation = TestViolation {
                violation_id: format!("viol-{}", i),
                policy_id: "pol-001".to_string(),
                severity: severity.to_string(),
            };

            assert_eq!(violation.severity, *severity);
        }

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    // ==================== Incident Tests ====================

    #[test]
    fn test_incident_creation() {
        let start = Instant::now();

        let incident = TestIncident {
            incident_id: "inc-001".to_string(),
            severity: "critical".to_string(),
            affected_records: 1000,
        };

        assert_eq!(incident.incident_id, "inc-001");
        assert_eq!(incident.affected_records, 1000);

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    #[test]
    fn test_data_breach_threshold() {
        let start = Instant::now();

        let breach_threshold = 500;
        let incidents = vec![
            ("inc-001", 100),
            ("inc-002", 600),
            ("inc-003", 1000),
        ];

        for (id, records) in incidents {
            let incident = TestIncident {
                incident_id: id.to_string(),
                severity: if records > breach_threshold { "critical" } else { "medium" }.to_string(),
                affected_records: records,
            };

            if records > breach_threshold {
                assert_eq!(incident.severity, "critical");
            }
        }

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    // ==================== Access Review Tests ====================

    #[test]
    fn test_access_review_status() {
        let start = Instant::now();

        let statuses = vec!["pending", "in_progress", "completed", "overdue"];

        for status in statuses {
            let review_status = status.to_string();
            assert!(["pending", "in_progress", "completed", "overdue"].contains(&review_status.as_str()));
        }

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    // ==================== Evidence Tests ====================

    #[test]
    fn test_evidence_types() {
        let start = Instant::now();

        let evidence_types = vec!["screenshot", "log_file", "audit_trail", "test_result"];

        for evidence_type in evidence_types {
            let evidence_id = format!("evid-{}", evidence_type);
            assert!(evidence_id.starts_with("evid-"));
        }

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    #[test]
    fn test_evidence_hash_validation() {
        let start = Instant::now();

        let hash = "a1b2c3d4e5f6";
        let hash_length = hash.len();

        assert!(hash_length > 0);
        assert!(hash.chars().all(|c| c.is_ascii_hexdigit()));

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    // ==================== Compliance Scoring Tests ====================

    #[test]
    fn test_compliance_score_calculation() {
        let start = Instant::now();

        let total_controls = 100;
        let passing_controls = 95;
        let compliance_score = (passing_controls as f64 / total_controls as f64) * 100.0;

        assert_eq!(compliance_score, 95.0);
        assert!(compliance_score >= 90.0);

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    #[test]
    fn test_framework_compliance_status() {
        let start = Instant::now();

        let frameworks = vec![
            ("SOX", 98.5),
            ("GDPR", 96.0),
            ("HIPAA", 97.2),
            ("SOC2", 95.8),
        ];

        for (framework, score) in frameworks {
            let status = if score >= 95.0 { "compliant" } else { "non-compliant" };
            assert_eq!(status, "compliant");
        }

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    // ==================== Risk Assessment Tests ====================

    #[test]
    fn test_risk_score_calculation() {
        let start = Instant::now();

        let likelihood = 0.7;
        let impact = 0.9;
        let risk_score = likelihood * impact;

        assert!(risk_score > 0.6);
        assert!(risk_score <= 1.0);

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    #[test]
    fn test_risk_levels() {
        let start = Instant::now();

        let risk_scores = vec![
            (0.2, "low"),
            (0.5, "medium"),
            (0.7, "high"),
            (0.9, "critical"),
        ];

        for (score, expected_level) in risk_scores {
            let level = if score >= 0.8 {
                "critical"
            } else if score >= 0.6 {
                "high"
            } else if score >= 0.4 {
                "medium"
            } else {
                "low"
            };

            assert_eq!(level, expected_level);
        }

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    // ==================== Data Classification Tests ====================

    #[test]
    fn test_data_classification_levels() {
        let start = Instant::now();

        let classifications = vec!["public", "internal", "confidential", "restricted"];

        for classification in classifications {
            let classification_str = classification.to_string();
            assert!(["public", "internal", "confidential", "restricted"]
                .contains(&classification_str.as_str()));
        }

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    // ==================== Retention Policy Tests ====================

    #[test]
    fn test_retention_period_calculation() {
        let start = Instant::now();

        let retention_days = vec![
            ("public", 30),
            ("internal", 180),
            ("confidential", 365),
            ("restricted", 2555), // 7 years
        ];

        for (classification, days) in retention_days {
            assert!(days > 0);
            if classification == "restricted" {
                assert!(days >= 2555);
            }
        }

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    // ==================== Integration Tests ====================

    #[test]
    fn test_end_to_end_audit_flow() {
        let start = Instant::now();

        // Create event
        let event = TestAuditEvent {
            event_id: "evt-001".to_string(),
            event_type: "data_access".to_string(),
            actor: "user-123".to_string(),
            action: "read_pii".to_string(),
            outcome: "success".to_string(),
        };

        // Create policy
        let policy = TestPolicy {
            policy_id: "pol-001".to_string(),
            policy_name: "PII Access Policy".to_string(),
            framework: "GDPR".to_string(),
            version: "1.0".to_string(),
        };

        // Check compliance
        let is_compliant = event.outcome == "success" && policy.framework == "GDPR";

        assert!(is_compliant);
        assert_eq!(event.event_id, "evt-001");
        assert_eq!(policy.framework, "GDPR");

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }

    #[test]
    fn test_multi_framework_compliance() {
        let start = Instant::now();

        let frameworks = vec!["SOX", "GDPR", "HIPAA"];
        let mut compliance_scores = Vec::new();

        for framework in frameworks {
            let policy = TestPolicy {
                policy_id: format!("pol-{}", framework),
                policy_name: format!("{} Policy", framework),
                framework: framework.to_string(),
                version: "1.0".to_string(),
            };

            let score = 95.0; // Mock score
            compliance_scores.push((policy.framework, score));
        }

        assert_eq!(compliance_scores.len(), 3);
        assert!(compliance_scores.iter().all(|(_, score)| *score >= 90.0));

        let duration = start.elapsed();
        assert!(duration.as_nanos() <= 2, "Test exceeded 2ns budget: {:?}", duration);
    }
}
