foxhunt/crates/risk/tests/compliance_edge_cases_tests.rs

//! Compliance Edge Case Tests
//! Target: Edge cases for compliance validation and regulatory rules
//! Focus: Simultaneous violations, threshold boundaries, conflict resolution

#![allow(
    dead_code,
    unused_assignments,
    unused_crate_dependencies,
    clippy::indexing_slicing,
    clippy::useless_vec,
    clippy::vec_init_then_push
)]

use chrono::{Duration, Timelike, Utc};

#[derive(Debug, Clone)]
struct ComplianceViolation {
    violation_type: String,
    severity: String,
    timestamp: chrono::DateTime<Utc>,
}

#[derive(Debug, Clone)]
struct PositionLimit {
    symbol: String,
    max_quantity: f64,
    current_quantity: f64,
}

#[cfg(test)]
mod threshold_boundary_tests {
    use super::*;

    #[test]
    fn test_position_exactly_at_limit() {
        let limit = PositionLimit {
            symbol: "AAPL".to_owned(),
            max_quantity: 10000.0,
            current_quantity: 10000.0,
        };

        // Exactly at limit should be allowed
        assert!(limit.current_quantity <= limit.max_quantity);
    }

    #[test]
    fn test_position_one_unit_over_limit() {
        let limit = PositionLimit {
            symbol: "AAPL".to_owned(),
            max_quantity: 10000.0,
            current_quantity: 10001.0,
        };

        assert!(limit.current_quantity > limit.max_quantity);
    }

    #[test]
    fn test_position_one_unit_under_limit() {
        let limit = PositionLimit {
            symbol: "AAPL".to_owned(),
            max_quantity: 10000.0,
            current_quantity: 9999.0,
        };

        assert!(limit.current_quantity < limit.max_quantity);
    }

    #[test]
    fn test_fractional_position_at_limit() {
        let limit = PositionLimit {
            symbol: "BTC".to_owned(),
            max_quantity: 1.5,
            current_quantity: 1.5,
        };

        assert!(limit.current_quantity <= limit.max_quantity);
    }

    #[test]
    fn test_zero_position_limit() {
        let limit = PositionLimit {
            symbol: "RESTRICTED".to_owned(),
            max_quantity: 0.0,
            current_quantity: 0.0,
        };

        // Zero limit means no positions allowed
        assert!(limit.current_quantity <= limit.max_quantity);
    }
}

#[cfg(test)]
mod simultaneous_violation_tests {
    use super::*;

    #[test]
    fn test_multiple_simultaneous_violations() {
        let violations = vec![
            ComplianceViolation {
                violation_type: "Position Limit".to_owned(),
                severity: "High".to_owned(),
                timestamp: Utc::now(),
            },
            ComplianceViolation {
                violation_type: "Concentration Risk".to_owned(),
                severity: "Medium".to_owned(),
                timestamp: Utc::now(),
            },
            ComplianceViolation {
                violation_type: "Sector Exposure".to_owned(),
                severity: "Low".to_owned(),
                timestamp: Utc::now(),
            },
        ];

        // All violations should be tracked
        assert_eq!(violations.len(), 3);

        // Verify all have timestamps
        for v in &violations {
            assert!(v.timestamp <= Utc::now());
        }
    }

    #[test]
    fn test_cascading_violations() {
        let mut violations = Vec::new();

        // Primary violation
        violations.push(ComplianceViolation {
            violation_type: "Daily Loss Limit".to_owned(),
            severity: "Critical".to_owned(),
            timestamp: Utc::now(),
        });

        // Cascading violations triggered by primary
        violations.push(ComplianceViolation {
            violation_type: "Risk Budget Exceeded".to_owned(),
            severity: "High".to_owned(),
            timestamp: Utc::now() + Duration::milliseconds(10),
        });

        violations.push(ComplianceViolation {
            violation_type: "Portfolio VaR Breach".to_owned(),
            severity: "High".to_owned(),
            timestamp: Utc::now() + Duration::milliseconds(20),
        });

        assert_eq!(violations.len(), 3);
    }

    #[test]
    fn test_violation_ordering_by_severity() {
        let mut violations = vec![("Low", 1), ("Critical", 4), ("Medium", 2), ("High", 3)];

        // Sort by severity (manual scoring)
        violations.sort_by_key(|v| v.1);
        violations.reverse();

        assert_eq!(violations[0].0, "Critical");
        assert_eq!(violations[3].0, "Low");
    }
}

#[cfg(test)]
mod violation_during_market_close_tests {
    use super::*;

    #[test]
    fn test_violation_at_market_close() {
        let market_close = Utc::now()
            .date_naive()
            .and_hms_opt(16, 0, 0)
            .unwrap()
            .and_utc();

        let violation = ComplianceViolation {
            violation_type: "EOD Position Check".to_owned(),
            severity: "High".to_owned(),
            timestamp: market_close,
        };

        // Violation exactly at close should be recorded
        assert_eq!(violation.timestamp.time().hour(), 16);
        assert_eq!(violation.timestamp.time().minute(), 0);
    }

    #[test]
    fn test_violation_after_market_close() {
        let after_close = Utc::now()
            .date_naive()
            .and_hms_opt(16, 30, 0)
            .unwrap()
            .and_utc();

        let violation = ComplianceViolation {
            violation_type: "After Hours Trading".to_owned(),
            severity: "Medium".to_owned(),
            timestamp: after_close,
        };

        assert!(violation.timestamp.time().hour() >= 16);
    }

    #[test]
    fn test_violation_detection_window_closed() {
        let market_open = Utc::now()
            .date_naive()
            .and_hms_opt(9, 30, 0)
            .unwrap()
            .and_utc();
        let market_close = Utc::now()
            .date_naive()
            .and_hms_opt(16, 0, 0)
            .unwrap()
            .and_utc();
        let check_time = Utc::now()
            .date_naive()
            .and_hms_opt(17, 0, 0)
            .unwrap()
            .and_utc();

        let is_market_hours = check_time >= market_open && check_time <= market_close;

        assert!(!is_market_hours);
    }
}

#[cfg(test)]
mod compliance_rule_conflict_tests {

    #[test]
    fn test_conflicting_position_limits() {
        // Global limit
        let global_limit: f64 = 50000.0;

        // Symbol-specific limit
        let symbol_limit: f64 = 10000.0;

        // Current position
        let position: f64 = 15000.0;

        // Should use more restrictive limit
        let effective_limit = global_limit.min(symbol_limit);
        assert_eq!(effective_limit, symbol_limit);
        assert!(position > effective_limit);
    }

    #[test]
    fn test_sector_vs_symbol_limits() {
        // Sector exposure limit
        let tech_sector_limit = 100000.0;
        let tech_sector_exposure = 95000.0;

        // Adding new tech stock position
        let new_position = 10000.0;

        let would_exceed = (tech_sector_exposure + new_position) > tech_sector_limit;
        assert!(would_exceed);
    }

    #[test]
    fn test_regulatory_exemption_override() {
        let base_limit = 10000.0;
        let exemption_multiplier = 2.0;

        let effective_limit_with_exemption = base_limit * exemption_multiplier;

        let position = 15000.0;

        // Position allowed with exemption
        assert!(position <= effective_limit_with_exemption);
        // But violates base limit
        assert!(position > base_limit);
    }
}

#[cfg(test)]
mod emergency_override_tests {
    use super::*;

    #[test]
    fn test_emergency_override_bypasses_limits() {
        let normal_limit = 10000.0;
        let position = 50000.0;
        let emergency_override = true;

        let is_compliant = if emergency_override {
            true
        } else {
            position <= normal_limit
        };

        assert!(is_compliant);
    }

    #[test]
    fn test_temporary_override_expiration() {
        let override_granted = Utc::now();
        let override_duration = Duration::hours(1);
        let override_expires = override_granted + override_duration;

        let current_time = Utc::now() + Duration::hours(2);

        let override_active = current_time < override_expires;
        assert!(!override_active);
    }

    #[test]
    fn test_override_authorization_level() {
        let required_level = 3; // Risk manager level
        let user_level = 2; // Trader level

        let can_override = user_level >= required_level;
        assert!(!can_override);
    }

    #[test]
    fn test_emergency_override_audit_trail() {
        let override_event = ComplianceViolation {
            violation_type: "Emergency Override Used".to_owned(),
            severity: "Critical".to_owned(),
            timestamp: Utc::now(),
        };

        // Override should always be logged
        assert!(!override_event.violation_type.is_empty());
        assert_eq!(override_event.severity, "Critical");
    }
}

#[cfg(test)]
mod position_limit_enforcement_tests {
    use super::*;

    #[test]
    fn test_multiple_orders_pushing_over_limit() {
        let limit = 10000.0;
        let current_position = 8000.0;

        let orders = vec![1000.0, 1500.0, 2000.0];

        let mut position = current_position;
        let mut violations = Vec::new();

        for order in orders {
            if position + order > limit {
                violations.push(format!("Order {} would exceed limit", order));
            } else {
                position += order;
            }
        }

        assert_eq!(violations.len(), 2); // Last 2 orders violate
        assert_eq!(position, 9000.0); // Only first order executed
    }

    #[test]
    fn test_limit_change_during_active_orders() {
        let initial_limit = 10000.0;
        let position = 9500.0;
        let pending_order = 1000.0;

        // Limit reduced while order pending
        let new_limit = 8000.0;

        let would_violate_new_limit = (position + pending_order) > new_limit;
        assert!(would_violate_new_limit);

        let would_violate_old_limit = (position + pending_order) > initial_limit;
        assert!(would_violate_old_limit); // Also violates old limit
    }

    #[test]
    fn test_cross_asset_limit_interaction() {
        // Correlated assets with shared limit
        let shared_limit = 50000.0;

        let positions = vec![("AAPL", 20000.0), ("MSFT", 18000.0), ("GOOGL", 15000.0)];

        let total: f64 = positions.iter().map(|(_, qty)| qty).sum();

        assert!(total > shared_limit);
    }

    #[test]
    fn test_net_position_vs_gross_position_limits() {
        let long_positions: f64 = 50000.0;
        let short_positions: f64 = -30000.0;

        let net_position = long_positions + short_positions;
        let gross_position = long_positions.abs() + short_positions.abs();

        let net_limit: f64 = 30000.0;
        let gross_limit: f64 = 70000.0;

        let net_compliant = net_position.abs() <= net_limit;
        let gross_compliant = gross_position <= gross_limit;

        assert!(net_compliant);
        assert!(gross_compliant);
    }

    #[test]
    fn test_intraday_vs_overnight_position_limits() {
        let position = 15000.0;
        let intraday_limit = 20000.0;
        let overnight_limit = 10000.0;

        let market_open = Utc::now()
            .date_naive()
            .and_hms_opt(9, 30, 0)
            .unwrap()
            .and_utc();
        let market_close = Utc::now()
            .date_naive()
            .and_hms_opt(16, 0, 0)
            .unwrap()
            .and_utc();

        let current_time = Utc::now()
            .date_naive()
            .and_hms_opt(15, 0, 0)
            .unwrap()
            .and_utc();

        let is_intraday = current_time >= market_open && current_time <= market_close;
        let applicable_limit = if is_intraday {
            intraday_limit
        } else {
            overnight_limit
        };

        let compliant = position <= applicable_limit;
        assert!(compliant);
    }
}

#[cfg(test)]
mod regulatory_reporting_edge_cases {
    use super::*;

    #[test]
    fn test_violation_count_threshold_reporting() {
        let violations = vec![
            ComplianceViolation {
                violation_type: "Minor Breach".to_owned(),
                severity: "Low".to_owned(),
                timestamp: Utc::now(),
            };
            10
        ];

        let reporting_threshold = 5;
        let requires_reporting = violations.len() >= reporting_threshold;

        assert!(requires_reporting);
    }

    #[test]
    fn test_material_violation_immediate_reporting() {
        let violation = ComplianceViolation {
            violation_type: "Market Manipulation".to_owned(),
            severity: "Critical".to_owned(),
            timestamp: Utc::now(),
        };

        let material_types = vec!["Market Manipulation", "Insider Trading", "Front Running"];
        let is_material = material_types.contains(&violation.violation_type.as_str());

        assert!(is_material);
    }

    #[test]
    fn test_cross_day_violation_aggregation() {
        let day1_violations = vec![
            ComplianceViolation {
                violation_type: "Position Limit".to_owned(),
                severity: "Medium".to_owned(),
                timestamp: Utc::now() - Duration::days(1),
            };
            3
        ];

        let day2_violations = vec![
            ComplianceViolation {
                violation_type: "Position Limit".to_owned(),
                severity: "Medium".to_owned(),
                timestamp: Utc::now(),
            };
            2
        ];

        let weekly_threshold = 4;
        let total_violations = day1_violations.len() + day2_violations.len();

        let requires_escalation = total_violations > weekly_threshold;
        assert!(requires_escalation);
    }
}

#[cfg(test)]
mod compliance_state_consistency_tests {
    use super::*;

    #[test]
    fn test_violation_clear_after_position_reduction() {
        let mut position = 15000.0;
        let limit = 10000.0;

        // Initial violation
        let initial_violation = position > limit;
        assert!(initial_violation);

        // Reduce position
        position = 8000.0;

        // Violation cleared
        let current_violation = position > limit;
        assert!(!current_violation);
    }

    #[test]
    fn test_persistent_violation_tracking() {
        let violation_start = Utc::now() - Duration::hours(2);
        let current_time = Utc::now();

        let violation_duration = current_time - violation_start;

        let max_acceptable_duration = Duration::hours(1);

        let requires_escalation = violation_duration > max_acceptable_duration;
        assert!(requires_escalation);
    }

    #[test]
    fn test_false_positive_violation_clearing() {
        // Temporary data glitch causes false violation
        let mut is_violation = true;

        // After data correction
        is_violation = false;

        assert!(!is_violation);
    }
}