/// SpyVsSpy High-Speed Add-on: MIMO Frequency Encryption Module
/// [USAL v1.0 ALIGNED: SUBSTRATE-AGNOSTIC WAVEFORM SUPPORT]
/// Implements frequency-agility with a 30ns rotation duty cycle.
/// Used for Substrate-Level Radio Attestation and SAW transit.

pub struct MIMOFreqEncryptor {
    pub rotation_duty_ns: u64,
    pub channels: usize,
    pub base_frequency_hz: f64,
    pub saw_transit_mode: bool, // Tracks if we are encrypting a USAL SAW
}

impl MIMOFreqEncryptor {
    pub fn new() -> Self {
        Self {
            rotation_duty_ns: 30, // 33.33 MHz rotation
            channels: 8,          // 8x8 MIMO
            base_frequency_hz: 5.2e9, // 5.2 GHz
            saw_transit_mode: true,   // Default to USAL SAW encryption mode
        }
    }

    /// Self-Referential Adaptive Scheme: Targets Low Energy Loads.
    /// The rotation key is derived from the substrate's current energy state.
    pub fn rotate_mask_adaptive(&self, current_ns: u64, energy_load_mw: f64, saw_hash: u64) -> u64 {
        let window = current_ns / self.rotation_duty_ns;
        
        // Target low energy loads by modulating complexity
        let complexity_factor = if energy_load_mw < 100.0 { 1 } else { 4 };
        
        let mut hasher = std::collections::hash_map::DefaultHasher::new();
        use std::hash::Hasher;
        
        hasher.write_u64(window);
        hasher.write_u64((energy_load_mw * 1000.0) as u64); // Self-referential tie to power
        hasher.write_u64(complexity_factor);
        if self.saw_transit_mode {
            hasher.write_u64(saw_hash); // Bind SAW identity to the transit mask
        }
        
        hasher.finish()
    }

    /// Verifies if a given frequency delta fits the 30ns substrate constraint.
    pub fn verify_substrate_agility(&self, delta_ns: u64) -> bool {
        // If an attacker claims 30ns agility but their jitter is > 100ns, identify as synthetic.
        delta_ns <= self.rotation_duty_ns + 5 
    }
}

pub fn get_mimo_status() -> String {
    let mimo = MIMOFreqEncryptor::new();
    format!(
        "MIMO_ACTIVE (USAL_SAW_MODE): {} channels, {}ns rotation cycle ({:.2} MHz)",
        mimo.channels,
        mimo.rotation_duty_ns,
        1000.0 / mimo.rotation_duty_ns as f64
    )
}