//! Comprehensive Emergency Response & Drawdown Tests
//! Target: 95%+ coverage for emergency systems
//! Focus: Incident escalation, consecutive violations, drawdown protection, stress testing

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

use chrono::{Duration, Utc};
use std::collections::HashMap;

#[cfg(test)]
mod emergency_escalation_tests {

    #[test]
    fn test_single_violation_no_escalation() {
        let violation_count = 1;
        let escalation_threshold = 3;

        let should_escalate = violation_count >= escalation_threshold;
        assert!(!should_escalate);
    }

    #[test]
    fn test_threshold_violation_triggers_escalation() {
        let violation_count = 3;
        let escalation_threshold = 3;

        let should_escalate = violation_count >= escalation_threshold;
        assert!(should_escalate);
    }

    #[test]
    fn test_consecutive_violations_tracking() {
        let mut consecutive_violations = 0;

        // Simulate violations
        consecutive_violations += 1; // Violation 1
        consecutive_violations += 1; // Violation 2
        consecutive_violations += 1; // Violation 3

        assert_eq!(consecutive_violations, 3);
    }

    #[test]
    fn test_violation_reset_on_compliance() {
        let initial_violations = 2;

        // Compliant action resets counter
        let consecutive_violations = 0;

        assert_eq!(consecutive_violations, 0);
        assert_ne!(initial_violations, consecutive_violations);
    }

    #[test]
    fn test_escalation_levels() {
        let violation_count = 5;

        let escalation_level = if violation_count >= 5 {
            "critical"
        } else if violation_count >= 3 {
            "high"
        } else if violation_count >= 2 {
            "medium"
        } else {
            "low"
        };

        assert_eq!(escalation_level, "critical");
    }
}

#[cfg(test)]
mod emergency_contact_tests {

    #[test]
    fn test_emergency_contact_list() {
        let contacts = vec![
            "risk@foxhunt.com",
            "trading@foxhunt.com",
            "compliance@foxhunt.com",
        ];

        assert_eq!(contacts.len(), 3);
        assert!(contacts.contains(&"risk@foxhunt.com"));
    }

    #[test]
    fn test_contact_notification_on_critical() {
        let severity = "critical";
        let should_notify = severity == "critical";

        assert!(should_notify);
    }

    #[test]
    fn test_multi_tier_notification() {
        let violation_count = 5;

        let mut notify_list: Vec<&str> = Vec::new();

        if violation_count >= 1 {
            notify_list.push("risk_team");
        }
        if violation_count >= 3 {
            notify_list.push("senior_management");
        }
        if violation_count >= 5 {
            notify_list.push("executives");
        }

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

    #[test]
    fn test_emergency_contact_validation() {
        let contact = "risk@foxhunt.com";
        let is_valid = contact.contains('@') && contact.contains('.');

        assert!(is_valid);
    }
}

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

    #[test]
    fn test_drawdown_calculation() {
        let peak_value = 120_000.0;
        let current_value = 90_000.0;
        let drawdown = (peak_value - current_value) / peak_value;

        assert_eq!(drawdown, 0.25); // 25% drawdown
    }

    #[test]
    fn test_max_drawdown_limit() {
        let current_drawdown = 0.25; // 25%
        let max_drawdown = 0.20; // 20%

        let exceeds_limit = current_drawdown > max_drawdown;
        assert!(exceeds_limit);
    }

    #[test]
    fn test_drawdown_recovery() {
        let peak_value = 120_000.0;
        let trough_value = 90_000.0;
        let current_value = 115_000.0;

        let initial_drawdown = (peak_value - trough_value) / peak_value;
        let current_drawdown = (peak_value - current_value) / peak_value;

        assert!(current_drawdown < initial_drawdown);
    }

    #[test]
    fn test_new_peak_detection() {
        let previous_peak = 120_000.0;
        let current_value = 125_000.0;

        let is_new_peak = current_value > previous_peak;
        assert!(is_new_peak);
    }

    #[test]
    fn test_drawdown_duration() {
        let peak_timestamp = Utc::now() - Duration::days(30);
        let current_timestamp = Utc::now();

        let drawdown_days = (current_timestamp - peak_timestamp).num_days();
        assert_eq!(drawdown_days, 30);
    }

    #[test]
    fn test_underwater_period() {
        // Underwater = below previous peak
        let peak_value = 120_000.0;
        let current_value = 110_000.0;

        let is_underwater = current_value < peak_value;
        assert!(is_underwater);
    }
}

#[cfg(test)]
mod loss_tracking_tests {

    #[test]
    fn test_daily_loss_accumulation() {
        let mut daily_loss = 0.0;

        // Simulate losses throughout the day
        daily_loss += -1000.0; // Trade 1 loss
        daily_loss += -500.0; // Trade 2 loss
        daily_loss += 300.0; // Trade 3 profit
        daily_loss += -800.0; // Trade 4 loss

        assert_eq!(daily_loss, -2000.0);
    }

    #[test]
    fn test_daily_loss_limit_breach() {
        let daily_loss = -25_000.0;
        let daily_loss_limit = -20_000.0;

        let breach = daily_loss < daily_loss_limit;
        assert!(breach);
    }

    #[test]
    fn test_loss_limit_reset_at_day_end() {
        let previous_day_loss = -15_000.0;

        // Simulate day rollover
        let daily_loss = 0.0;

        assert_eq!(daily_loss, 0.0);
        assert_ne!(previous_day_loss, daily_loss);
    }

    #[test]
    fn test_cumulative_loss_tracking() {
        let losses = vec![-1000.0, -500.0, -2000.0, -750.0];
        let total_loss: f64 = losses.iter().sum();

        assert_eq!(total_loss, -4250.0);
    }
}

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

    #[test]
    fn test_market_crash_scenario() {
        let portfolio_value = 1_000_000.0;
        let crash_magnitude = -0.20; // 20% crash
        let stressed_value = portfolio_value * (1.0 + crash_magnitude);

        assert_eq!(stressed_value, 800_000.0);
    }

    #[test]
    fn test_volatility_spike_scenario() {
        let normal_volatility = 0.15; // 15%
        let stress_multiplier = 3.0;
        let stressed_volatility = normal_volatility * stress_multiplier;

        // Use approximate equality for floating point comparison
        assert!(
            (stressed_volatility - 0.45_f64).abs() < 1e-10,
            "Expected 0.45, got {}",
            stressed_volatility
        ); // 45%
    }

    #[test]
    fn test_liquidity_crisis_scenario() {
        let normal_bid_ask_spread = 0.01; // 1 cent
        let stress_multiplier = 10.0;
        let stressed_spread = normal_bid_ask_spread * stress_multiplier;

        assert_eq!(stressed_spread, 0.10); // 10 cents
    }

    #[test]
    fn test_correlation_breakdown_scenario() {
        // Assets become perfectly correlated in stress
        let normal_correlation = 0.3;
        let stress_correlation = 1.0;

        assert!(stress_correlation > normal_correlation);
    }

    #[test]
    fn test_multiple_stress_scenarios() {
        let base_value = 1_000_000.0;

        let scenarios = HashMap::from([
            ("market_crash", -0.20),
            ("flash_crash", -0.10),
            ("volatility_spike", -0.15),
        ]);

        for (name, shock) in &scenarios {
            let stressed = base_value * (1.0 + shock);
            assert!(stressed < base_value, "Scenario {} failed", name);
        }
    }
}

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

    #[test]
    fn test_incident_severity_classification() {
        let loss_amount = -50_000.0;

        let severity = if loss_amount < -100_000.0 {
            "critical"
        } else if loss_amount < -50_000.0 {
            "high"
        } else if loss_amount < -10_000.0 {
            "medium"
        } else {
            "low"
        };

        assert_eq!(severity, "medium");
    }

    #[test]
    fn test_automatic_incident_logging() {
        let mut incident_log: Vec<HashMap<String, String>> = Vec::new();

        let incident = HashMap::from([
            ("timestamp".to_owned(), Utc::now().to_rfc3339()),
            ("type".to_owned(), "POSITION_LIMIT_BREACH".to_owned()),
            ("severity".to_owned(), "high".to_owned()),
        ]);

        incident_log.push(incident);
        assert_eq!(incident_log.len(), 1);
    }

    #[test]
    fn test_incident_deduplication() {
        let mut incident_ids: std::collections::HashSet<String> = std::collections::HashSet::new();

        let incident_id = "INC-2025-001";

        // First occurrence
        let is_new = incident_ids.insert(incident_id.to_owned());
        assert!(is_new);

        // Duplicate
        let is_duplicate = !incident_ids.insert(incident_id.to_owned());
        assert!(is_duplicate);
    }
}

#[cfg(test)]
mod automated_response_tests {

    #[test]
    fn test_automatic_position_reduction() {
        let current_position = 150_000.0;
        let position_limit = 100_000.0;
        let target_reduction = current_position - position_limit;

        assert_eq!(target_reduction, 50_000.0);
    }

    #[test]
    fn test_automatic_trading_halt() {
        let consecutive_losses = 5;
        let halt_threshold = 3;

        let should_halt = consecutive_losses >= halt_threshold;
        assert!(should_halt);
    }

    #[test]
    fn test_risk_reduction_mode() {
        let is_risk_reduction_mode = true;
        let allowed_actions = vec!["CLOSE_POSITIONS", "REDUCE_EXPOSURE"];

        assert!(is_risk_reduction_mode);
        assert!(allowed_actions.contains(&"CLOSE_POSITIONS"));
        assert!(!allowed_actions.contains(&"INCREASE_POSITIONS"));
    }
}

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

    #[test]
    fn test_gradual_position_rebuild() {
        let target_position = 100_000.0;
        let current_position = 0.0;
        let step_size = 20_000.0; // 20% at a time

        let mut rebuilt_position = current_position;
        while rebuilt_position < target_position {
            rebuilt_position += step_size;
            if rebuilt_position > target_position {
                rebuilt_position = target_position;
            }
        }

        assert_eq!(rebuilt_position, target_position);
    }

    #[test]
    fn test_recovery_time_limit() {
        let cooldown_period = Duration::hours(1);
        let elapsed = Duration::minutes(45);

        let can_resume = elapsed >= cooldown_period;
        assert!(!can_resume);
    }

    #[test]
    fn test_manual_override_required() {
        let automatic_recovery = false;
        let requires_manual_approval = !automatic_recovery;

        assert!(requires_manual_approval);
    }
}

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

    #[test]
    fn test_system_health_indicators() {
        let mut health_status: HashMap<String, bool> = HashMap::new();

        health_status.insert("market_data".to_owned(), true);
        health_status.insert("risk_engine".to_owned(), true);
        health_status.insert("execution".to_owned(), true);

        let all_healthy = health_status.values().all(|&v| v);
        assert!(all_healthy);
    }

    #[test]
    fn test_degraded_mode_detection() {
        let mut health_status: HashMap<String, bool> = HashMap::new();

        health_status.insert("market_data".to_owned(), true);
        health_status.insert("risk_engine".to_owned(), false); // Degraded
        health_status.insert("execution".to_owned(), true);

        let is_degraded = health_status.values().any(|&v| !v);
        assert!(is_degraded);
    }

    #[test]
    fn test_health_check_frequency() {
        let check_interval = Duration::seconds(5);
        let last_check = Utc::now() - Duration::seconds(6);
        let current_time = Utc::now();

        let should_check = (current_time - last_check) >= check_interval;
        assert!(should_check);
    }
}

#[cfg(test)]
mod alert_threshold_tests {

    #[test]
    fn test_tiered_alert_thresholds() {
        let utilization = 0.85; // 85%

        let alert_level = if utilization >= 0.95 {
            "critical"
        } else if utilization >= 0.85 {
            "warning"
        } else if utilization >= 0.75 {
            "info"
        } else {
            "ok"
        };

        assert_eq!(alert_level, "warning");
    }

    #[test]
    fn test_dynamic_threshold_adjustment() {
        let base_threshold = 100_000.0;
        let volatility_multiplier = 1.5;
        let adjusted_threshold = base_threshold * volatility_multiplier;

        assert_eq!(adjusted_threshold, 150_000.0);
    }
}

#[cfg(test)]
mod emergency_shutdown_tests {

    #[test]
    fn test_orderly_shutdown_sequence() {
        let mut shutdown_steps: Vec<String> = Vec::new();

        shutdown_steps.push("STOP_NEW_ORDERS".to_owned());
        shutdown_steps.push("CLOSE_POSITIONS".to_owned());
        shutdown_steps.push("DISCONNECT_FEEDS".to_owned());
        shutdown_steps.push("HALT_TRADING".to_owned());

        assert_eq!(shutdown_steps.len(), 4);
        assert_eq!(shutdown_steps[0], "STOP_NEW_ORDERS");
        assert_eq!(shutdown_steps[3], "HALT_TRADING");
    }

    #[test]
    fn test_emergency_vs_orderly_shutdown() {
        let is_emergency = true;

        let shutdown_type = if is_emergency {
            "IMMEDIATE_HALT"
        } else {
            "ORDERLY_SHUTDOWN"
        };

        assert_eq!(shutdown_type, "IMMEDIATE_HALT");
    }
}

#[cfg(test)]
mod rate_limiting_tests {

    #[test]
    fn test_order_rate_limiting() {
        let orders_per_second = 150;
        let rate_limit = 100;

        let should_throttle = orders_per_second > rate_limit;
        assert!(should_throttle);
    }

    #[test]
    fn test_burst_protection() {
        let orders_in_burst = 50;
        let burst_limit = 30;

        let is_burst = orders_in_burst > burst_limit;
        assert!(is_burst);
    }

    #[test]
    fn test_adaptive_rate_limiting() {
        let base_rate = 100;
        let system_load = 0.8; // 80% load
        let adjusted_rate = (base_rate as f64 * (1.0 - system_load)).round() as i32;

        // Floating point precision: 100 * 0.2 = 19.999... rounds to 20
        assert_eq!(adjusted_rate, 20);
    }
}

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

    #[test]
    fn test_multiple_circuit_breakers() {
        let mut breakers: HashMap<String, bool> = HashMap::new();

        breakers.insert("position_limit".to_owned(), false);
        breakers.insert("loss_limit".to_owned(), false);
        breakers.insert("volatility".to_owned(), true); // Triggered

        let any_triggered = breakers.values().any(|&v| v);
        assert!(any_triggered);
    }

    #[test]
    fn test_breaker_priority() {
        let breakers = vec![
            ("loss_limit", true, 1), // Highest priority
            ("position_limit", true, 2),
            ("volatility", false, 3),
        ];

        let active_breakers: Vec<_> = breakers
            .iter()
            .filter(|(_, triggered, _)| *triggered)
            .collect();

        assert_eq!(active_breakers.len(), 2);
        assert_eq!(active_breakers[0].2, 1); // Highest priority first
    }
}

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

    #[test]
    fn test_loss_check_interval() {
        let check_interval = Duration::seconds(5);
        let last_check = Utc::now() - Duration::seconds(6);

        let should_check = (Utc::now() - last_check) >= check_interval;
        assert!(should_check);
    }

    #[test]
    fn test_position_check_interval() {
        let check_interval = Duration::seconds(2);
        let last_check = Utc::now() - Duration::seconds(1);

        let should_check = (Utc::now() - last_check) >= check_interval;
        assert!(!should_check);
    }
}
