//! Comprehensive Circuit Breaker Tests
//! Target: 95%+ coverage for circuit breaker functionality
//! Focus: State transitions, Redis coordination, dynamic limits, error handling

#![allow(
    unused_crate_dependencies,
    clippy::field_reassign_with_default,
    clippy::redundant_clone,
    clippy::str_to_string
)]

// Import circuit breaker types
use chrono::Utc;
use common::types::Price;
use risk::circuit_breaker::{CircuitBreakerConfig, CircuitBreakerState};

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

    #[test]
    fn test_circuit_breaker_state_default() {
        let state = CircuitBreakerState::default();
        assert!(!state.is_active);
        assert_eq!(state.portfolio_value, Price::ZERO);
        assert_eq!(state.daily_loss_limit, Price::ZERO);
        assert_eq!(state.current_daily_loss, Price::ZERO);
        assert!(state.activation_reason.is_none());
        assert!(state.activated_at.is_none());
        assert_eq!(state.account_id, "default");
        assert_eq!(state.consecutive_violations, 0);
    }

    #[test]
    fn test_circuit_breaker_state_activation() {
        let mut state = CircuitBreakerState::default();
        state.is_active = true;
        state.activation_reason = Some("Daily loss limit exceeded".to_string());
        state.activated_at = Some(Utc::now());
        state.consecutive_violations = 1;

        assert!(state.is_active);
        assert!(state.activation_reason.is_some());
        assert!(state.activated_at.is_some());
        assert_eq!(state.consecutive_violations, 1);
    }

    #[test]
    fn test_circuit_breaker_state_serialization() {
        let state = CircuitBreakerState {
            is_active: true,
            portfolio_value: Price::new(1_000_000.0).unwrap(),
            daily_loss_limit: Price::new(20_000.0).unwrap(),
            current_daily_loss: Price::new(15_000.0).unwrap(),
            activation_reason: Some("Approaching limit".to_string()),
            activated_at: Some(Utc::now()),
            last_updated: Utc::now(),
            account_id: "test_account".to_string(),
            consecutive_violations: 2,
        };

        let serialized = serde_json::to_string(&state).expect("Serialization failed");
        let deserialized: CircuitBreakerState =
            serde_json::from_str(&serialized).expect("Deserialization failed");

        assert_eq!(state.is_active, deserialized.is_active);
        assert_eq!(state.account_id, deserialized.account_id);
        assert_eq!(
            state.consecutive_violations,
            deserialized.consecutive_violations
        );
    }

    #[test]
    fn test_circuit_breaker_state_clone() {
        let state = CircuitBreakerState::default();
        let cloned = state.clone();

        assert_eq!(state.is_active, cloned.is_active);
        assert_eq!(state.account_id, cloned.account_id);
        assert_eq!(state.consecutive_violations, cloned.consecutive_violations);
    }
}

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

    #[test]
    fn test_circuit_breaker_config_default() {
        let config = CircuitBreakerConfig::default();
        assert!(config.enabled);
        assert!(!config.auto_recovery_enabled); // Default is false for safety (manual recovery)
        assert!(config.max_consecutive_violations > 0);
        assert!(!config.redis_url.is_empty());
    }

    #[test]
    fn test_circuit_breaker_config_custom() {
        let config = CircuitBreakerConfig {
            enabled: true,
            daily_loss_percentage: Price::new(3.0).unwrap(),
            position_limit_percentage: Price::new(10.0).unwrap(),
            max_consecutive_violations: 5,
            redis_url: "redis://test:6379".to_string(),
            redis_key_prefix: "foxhunt:test".to_string(),
            auto_recovery_enabled: false,
            portfolio_refresh_interval_secs: 60,
            cooldown_period_secs: 300,
        };

        assert!(config.enabled);
        assert!(!config.auto_recovery_enabled);
        assert_eq!(config.max_consecutive_violations, 5);
        assert_eq!(config.redis_url, "redis://test:6379");
    }
}

#[cfg(test)]
mod dynamic_limit_calculation_tests {

    #[test]
    fn test_daily_loss_limit_calculation() {
        let portfolio_value = 1_000_000.0;
        let loss_percentage = 2.0; // 2%
        let expected_limit = portfolio_value * (loss_percentage / 100.0);

        assert_eq!(expected_limit, 20_000.0);
    }

    #[test]
    fn test_position_limit_calculation() {
        let portfolio_value = 500_000.0;
        let position_percentage = 5.0; // 5%
        let expected_limit = portfolio_value * (position_percentage / 100.0);

        assert_eq!(expected_limit, 25_000.0);
    }

    #[test]
    fn test_zero_portfolio_value() {
        let portfolio_value = 0.0;
        let loss_percentage = 2.0;
        let limit = portfolio_value * (loss_percentage / 100.0);

        assert_eq!(limit, 0.0);
    }

    #[test]
    fn test_large_portfolio_value() {
        let portfolio_value = 100_000_000.0; // $100M
        let loss_percentage = 2.0;
        let expected_limit = 2_000_000.0; // $2M

        let limit = portfolio_value * (loss_percentage / 100.0);
        assert_eq!(limit, expected_limit);
    }
}

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

    #[test]
    fn test_violation_counter_increment() {
        let mut state = CircuitBreakerState::default();
        assert_eq!(state.consecutive_violations, 0);

        state.consecutive_violations += 1;
        assert_eq!(state.consecutive_violations, 1);

        state.consecutive_violations += 1;
        assert_eq!(state.consecutive_violations, 2);
    }

    #[test]
    fn test_violation_counter_reset() {
        let mut state = CircuitBreakerState::default();
        state.consecutive_violations = 5;

        state.consecutive_violations = 0;
        assert_eq!(state.consecutive_violations, 0);
    }

    #[test]
    fn test_max_violations_threshold() {
        let config = CircuitBreakerConfig::default();
        let max = config.max_consecutive_violations;

        let mut state = CircuitBreakerState::default();
        state.consecutive_violations = max;

        assert!(state.consecutive_violations >= max);
    }

    #[test]
    fn test_violation_escalation() {
        let mut state = CircuitBreakerState::default();
        let threshold = 3;

        for _i in 0..5 {
            state.consecutive_violations += 1;
            if state.consecutive_violations >= threshold {
                state.is_active = true;
                break;
            }
        }

        assert!(state.is_active);
        assert!(state.consecutive_violations >= threshold);
    }
}

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

    #[test]
    fn test_daily_loss_accumulation() {
        let mut state = CircuitBreakerState::default();
        state.portfolio_value = Price::new(1_000_000.0).unwrap();
        state.daily_loss_limit = Price::new(20_000.0).unwrap();

        // Simulate losses
        state.current_daily_loss = Price::new(5_000.0).unwrap();
        assert!(state.current_daily_loss < state.daily_loss_limit);

        state.current_daily_loss = Price::new(15_000.0).unwrap();
        assert!(state.current_daily_loss < state.daily_loss_limit);

        state.current_daily_loss = Price::new(25_000.0).unwrap();
        assert!(state.current_daily_loss > state.daily_loss_limit);
    }

    #[test]
    fn test_loss_limit_breach_detection() {
        let state = CircuitBreakerState {
            is_active: false,
            portfolio_value: Price::new(1_000_000.0).unwrap(),
            daily_loss_limit: Price::new(20_000.0).unwrap(),
            current_daily_loss: Price::new(25_000.0).unwrap(),
            activation_reason: None,
            activated_at: None,
            last_updated: Utc::now(),
            account_id: "test".to_string(),
            consecutive_violations: 0,
        };

        let is_breached = state.current_daily_loss > state.daily_loss_limit;
        assert!(is_breached);
    }

    #[test]
    fn test_loss_percentage_calculation() {
        let portfolio_value = 1_000_000.0_f64;
        let current_loss = 15_000.0_f64;
        let loss_percentage = (current_loss / portfolio_value) * 100.0;

        assert!((loss_percentage - 1.5).abs() < 0.001);
    }

    #[test]
    fn test_zero_loss_scenario() {
        let mut state = CircuitBreakerState::default();
        state.portfolio_value = Price::new(1_000_000.0).unwrap();
        state.current_daily_loss = Price::ZERO;

        assert_eq!(state.current_daily_loss, Price::ZERO);
    }
}

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

    #[test]
    fn test_inactive_to_active_transition() {
        let mut state = CircuitBreakerState::default();
        assert!(!state.is_active);

        state.is_active = true;
        state.activation_reason = Some("Limit exceeded".to_string());
        state.activated_at = Some(Utc::now());

        assert!(state.is_active);
        assert!(state.activation_reason.is_some());
        assert!(state.activated_at.is_some());
    }

    #[test]
    fn test_active_to_inactive_transition() {
        let mut state = CircuitBreakerState {
            is_active: true,
            activation_reason: Some("Test".to_string()),
            activated_at: Some(Utc::now()),
            ..Default::default()
        };

        state.is_active = false;
        state.activation_reason = None;
        state.activated_at = None;

        assert!(!state.is_active);
        assert!(state.activation_reason.is_none());
        assert!(state.activated_at.is_none());
    }

    #[test]
    fn test_state_persistence_across_updates() {
        let mut state = CircuitBreakerState::default();
        state.account_id = "persistent_account".to_string();

        let account_before = state.account_id.clone();
        state.last_updated = Utc::now();
        let account_after = state.account_id.clone();

        assert_eq!(account_before, account_after);
    }
}

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

    #[test]
    fn test_cooldown_period_configuration() {
        let config = CircuitBreakerConfig::default();
        assert!(config.cooldown_period_secs > 0);
    }

    #[test]
    fn test_cooldown_expiration() {
        let cooldown_duration = 300; // 5 minutes in seconds
        let activation_time = Utc::now();
        let current_time =
            activation_time + chrono::Duration::seconds(cooldown_duration as i64 + 10);

        let elapsed = (current_time - activation_time).num_seconds();
        assert!(elapsed > cooldown_duration as i64);
    }

    #[test]
    fn test_cooldown_not_expired() {
        let cooldown_duration = 300;
        let activation_time = Utc::now();
        let current_time = activation_time + chrono::Duration::seconds(100);

        let elapsed = (current_time - activation_time).num_seconds();
        assert!(elapsed < cooldown_duration as i64);
    }
}

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

    #[test]
    fn test_refresh_interval_configuration() {
        let config = CircuitBreakerConfig::default();
        assert!(config.portfolio_refresh_interval_secs > 0);
    }

    #[test]
    fn test_portfolio_value_update() {
        let mut state = CircuitBreakerState::default();
        let old_value = state.portfolio_value;

        state.portfolio_value = Price::new(1_500_000.0).unwrap();
        state.last_updated = Utc::now();

        assert_ne!(state.portfolio_value, old_value);
    }

    #[test]
    fn test_dynamic_limit_recalculation() {
        let mut state = CircuitBreakerState::default();
        state.portfolio_value = Price::new(1_000_000.0).unwrap();

        let loss_percentage = 2.0;
        let new_limit = state.portfolio_value.to_f64() * (loss_percentage / 100.0);
        state.daily_loss_limit = Price::new(new_limit).unwrap();

        assert_eq!(state.daily_loss_limit, Price::new(20_000.0).unwrap());
    }
}

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

    #[test]
    fn test_negative_portfolio_value_handling() {
        // Portfolio values should never be negative
        let result = Price::new(-1000.0);
        assert!(result.is_err() || result.unwrap() == Price::ZERO);
    }

    #[test]
    fn test_negative_loss_percentage() {
        // Negative loss percentages should be handled
        let portfolio_value = 1_000_000.0;
        let loss_percentage = -2.0;
        let limit = portfolio_value * (loss_percentage / 100.0);

        assert!(limit < 0.0);
    }

    #[test]
    fn test_extreme_loss_percentage() {
        let portfolio_value = 1_000_000.0;
        let loss_percentage = 100.0; // 100% loss
        let limit = portfolio_value * (loss_percentage / 100.0);

        assert_eq!(limit, portfolio_value);
    }

    #[test]
    fn test_zero_consecutive_violations_threshold() {
        let config = CircuitBreakerConfig {
            max_consecutive_violations: 0,
            ..Default::default()
        };

        // Should handle zero threshold gracefully
        assert_eq!(config.max_consecutive_violations, 0);
    }
}

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

    #[test]
    fn test_auto_recovery_enabled_configuration() {
        let config = CircuitBreakerConfig {
            auto_recovery_enabled: true,
            ..Default::default()
        };
        assert!(config.auto_recovery_enabled);
    }

    #[test]
    fn test_auto_recovery_disabled_configuration() {
        let config = CircuitBreakerConfig {
            auto_recovery_enabled: false,
            ..Default::default()
        };
        assert!(!config.auto_recovery_enabled);
    }

    #[test]
    fn test_recovery_state_reset() {
        let mut state = CircuitBreakerState {
            is_active: true,
            consecutive_violations: 5,
            activation_reason: Some("Auto recovery test".to_string()),
            ..Default::default()
        };

        // Simulate recovery
        state.is_active = false;
        state.consecutive_violations = 0;
        state.activation_reason = None;
        state.current_daily_loss = Price::ZERO;

        assert!(!state.is_active);
        assert_eq!(state.consecutive_violations, 0);
        assert!(state.activation_reason.is_none());
    }
}
