oxirs-core 0.2.4

//! Quantum-Consciousness Integration Module
//!
//! This module implements quantum-inspired consciousness states for enhanced
//! graph processing, combining quantum computing principles with artificial
//! consciousness for next-generation RDF optimization.

use super::EmotionalState;
use crate::query::algebra::AlgebraTriplePattern;
use crate::OxirsError;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::f64::consts::PI;

/// Quantum consciousness state for enhanced processing
#[derive(Debug, Clone)]
pub struct QuantumConsciousnessState {
    /// Quantum superposition of consciousness levels
    pub consciousness_superposition: QuantumSuperposition,
    /// Quantum entanglement with data patterns
    pub pattern_entanglement: PatternEntanglement,
    /// Quantum coherence time for stable processing
    pub coherence_time: f64,
    /// Quantum state measurement results
    pub measurement_history: Vec<QuantumMeasurement>,
    /// Quantum error correction capability
    pub error_correction: QuantumErrorCorrection,
}

/// Quantum superposition of multiple consciousness states
#[derive(Debug, Clone)]
pub struct QuantumSuperposition {
    /// Amplitude weights for different states
    pub state_amplitudes: HashMap<EmotionalState, f64>,
    /// Phase information for quantum interference
    pub state_phases: HashMap<EmotionalState, f64>,
    /// Entanglement correlations between states
    pub state_entanglements: HashMap<(EmotionalState, EmotionalState), f64>,
    /// Decoherence rate
    pub decoherence_rate: f64,
}

/// Pattern entanglement for quantum-enhanced pattern recognition
#[derive(Debug, Clone)]
pub struct PatternEntanglement {
    /// Entangled pattern pairs
    pub entangled_patterns: HashMap<String, String>,
    /// Entanglement strength
    pub entanglement_strength: HashMap<String, f64>,
    /// Quantum correlation coefficients
    pub correlation_coefficients: HashMap<String, f64>,
    /// Bell state measurements
    pub bell_measurements: Vec<BellMeasurement>,
}

/// Quantum measurement result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QuantumMeasurement {
    /// Timestamp of measurement
    pub timestamp: std::time::SystemTime,
    /// Measured state
    pub measured_state: EmotionalState,
    /// Measurement probability
    pub probability: f64,
    /// Quantum fidelity
    pub fidelity: f64,
    /// Observable measured
    pub observable: String,
}

/// Bell state measurement for entanglement verification
#[derive(Debug, Clone)]
pub struct BellMeasurement {
    /// First pattern in Bell state
    pub pattern_a: String,
    /// Second pattern in Bell state
    pub pattern_b: String,
    /// Measurement outcome
    pub outcome: BellState,
    /// Violation of Bell inequality
    pub bell_violation: f64,
}

/// Bell states for quantum entanglement
#[derive(Debug, Clone)]
pub enum BellState {
    PhiPlus,  // |Φ+⟩ = (|00⟩ + |11⟩)/√2
    PhiMinus, // |Φ-⟩ = (|00⟩ - |11⟩)/√2
    PsiPlus,  // |Ψ+⟩ = (|01⟩ + |10⟩)/√2
    PsiMinus, // |Ψ-⟩ = (|01⟩ - |10⟩)/√2
}

/// Quantum error correction for consciousness stability
#[derive(Debug, Clone)]
pub struct QuantumErrorCorrection {
    /// Error syndrome table
    pub syndrome_table: HashMap<String, String>,
    /// Error correction codes
    pub correction_codes: Vec<QuantumCode>,
    /// Error rate threshold
    pub error_threshold: f64,
    /// Correction success rate
    pub correction_success_rate: f64,
}

/// Quantum error correction code
#[derive(Debug, Clone)]
pub struct QuantumCode {
    /// Code name
    pub name: String,
    /// Code distance
    pub distance: usize,
    /// Code rate
    pub rate: f64,
    /// Stabilizer generators
    pub stabilizers: Vec<String>,
}

impl Default for QuantumConsciousnessState {
    fn default() -> Self {
        Self::new()
    }
}

impl QuantumConsciousnessState {
    /// Create a new quantum consciousness state
    pub fn new() -> Self {
        let mut state_amplitudes = HashMap::new();
        let mut state_phases = HashMap::new();

        // Initialize equal superposition of all emotional states
        let states = vec![
            EmotionalState::Calm,
            EmotionalState::Excited,
            EmotionalState::Curious,
            EmotionalState::Cautious,
            EmotionalState::Confident,
            EmotionalState::Creative,
        ];

        let amplitude = 1.0 / (states.len() as f64).sqrt();
        for state in states {
            state_amplitudes.insert(state.clone(), amplitude);
            state_phases.insert(state, fastrand::f64() * 2.0 * PI);
        }

        Self {
            consciousness_superposition: QuantumSuperposition {
                state_amplitudes,
                state_phases,
                state_entanglements: HashMap::new(),
                decoherence_rate: 0.01,
            },
            pattern_entanglement: PatternEntanglement {
                entangled_patterns: HashMap::new(),
                entanglement_strength: HashMap::new(),
                correlation_coefficients: HashMap::new(),
                bell_measurements: Vec::new(),
            },
            coherence_time: 1000.0, // milliseconds
            measurement_history: Vec::new(),
            error_correction: QuantumErrorCorrection {
                syndrome_table: HashMap::new(),
                correction_codes: Self::initialize_quantum_codes(),
                error_threshold: 0.01,
                correction_success_rate: 0.99,
            },
        }
    }

    /// Initialize quantum error correction codes
    fn initialize_quantum_codes() -> Vec<QuantumCode> {
        vec![
            QuantumCode {
                name: "Steane_7_1_3".to_string(),
                distance: 3,
                rate: 1.0 / 7.0,
                stabilizers: vec![
                    "IIIXXXX".to_string(),
                    "IXXIIXX".to_string(),
                    "XIIXIXX".to_string(),
                    "IIIZZZZ".to_string(),
                    "IZZIIZZ".to_string(),
                    "ZIZIZIZ".to_string(),
                ],
            },
            QuantumCode {
                name: "Surface_Code".to_string(),
                distance: 5,
                rate: 1.0 / 25.0,
                stabilizers: vec!["XZXZX".to_string(), "ZXZXZ".to_string()],
            },
        ]
    }

    /// Evolve quantum state over time
    pub fn evolve_quantum_state(&mut self, time_delta: f64) -> Result<(), OxirsError> {
        // Apply Schrödinger evolution
        for (_, phase) in self.consciousness_superposition.state_phases.iter_mut() {
            *phase += time_delta * fastrand::f64() * 0.1; // Simplified Hamiltonian evolution
            *phase %= 2.0 * PI;
        }

        // Apply decoherence
        let decoherence_factor =
            (-time_delta * self.consciousness_superposition.decoherence_rate).exp();
        for (_, amplitude) in self.consciousness_superposition.state_amplitudes.iter_mut() {
            *amplitude *= decoherence_factor;
        }

        // Renormalize amplitudes
        self.renormalize_amplitudes()?;

        Ok(())
    }

    /// Renormalize quantum amplitudes
    fn renormalize_amplitudes(&mut self) -> Result<(), OxirsError> {
        let total_probability: f64 = self
            .consciousness_superposition
            .state_amplitudes
            .values()
            .map(|a| a * a)
            .sum();

        if total_probability > 0.0 {
            let normalization_factor = total_probability.sqrt();
            for (_, amplitude) in self.consciousness_superposition.state_amplitudes.iter_mut() {
                *amplitude /= normalization_factor;
            }
        }

        Ok(())
    }

    /// Measure quantum consciousness state
    pub fn measure_consciousness_state(&mut self) -> Result<QuantumMeasurement, OxirsError> {
        // Calculate measurement probabilities
        let mut probabilities = HashMap::new();
        for (state, amplitude) in &self.consciousness_superposition.state_amplitudes {
            probabilities.insert(state.clone(), amplitude * amplitude);
        }

        // Weighted random selection based on quantum probabilities
        let mut cumulative_prob = 0.0;
        let random_value = fastrand::f64();

        for (state, prob) in &probabilities {
            cumulative_prob += prob;
            if random_value <= cumulative_prob {
                // Collapse wavefunction to measured state
                self.collapse_to_state(state.clone())?;

                let measurement = QuantumMeasurement {
                    timestamp: std::time::SystemTime::now(),
                    measured_state: state.clone(),
                    probability: *prob,
                    fidelity: self.calculate_quantum_fidelity()?,
                    observable: "consciousness_state".to_string(),
                };

                self.measurement_history.push(measurement.clone());
                return Ok(measurement);
            }
        }

        // Fallback to most probable state
        let most_probable_state = probabilities
            .iter()
            .max_by(|a, b| a.1.partial_cmp(b.1).unwrap_or(std::cmp::Ordering::Equal))
            .map(|(state, _)| state.clone())
            .unwrap_or(EmotionalState::Calm);

        self.collapse_to_state(most_probable_state.clone())?;

        Ok(QuantumMeasurement {
            timestamp: std::time::SystemTime::now(),
            measured_state: most_probable_state.clone(),
            probability: probabilities
                .get(&most_probable_state)
                .copied()
                .unwrap_or(0.0),
            fidelity: self.calculate_quantum_fidelity()?,
            observable: "consciousness_state".to_string(),
        })
    }

    /// Collapse wavefunction to specific state
    fn collapse_to_state(&mut self, target_state: EmotionalState) -> Result<(), OxirsError> {
        // Set target state amplitude to 1, others to 0
        for (state, amplitude) in self.consciousness_superposition.state_amplitudes.iter_mut() {
            *amplitude = if *state == target_state { 1.0 } else { 0.0 };
        }

        Ok(())
    }

    /// Calculate quantum fidelity
    fn calculate_quantum_fidelity(&self) -> Result<f64, OxirsError> {
        // Simplified fidelity calculation based on coherence
        let coherence = self.coherence_time / 1000.0; // normalize to seconds
        let fidelity = (coherence / (coherence + 1.0)).min(1.0);
        Ok(fidelity)
    }

    /// Create quantum entanglement between patterns
    pub fn entangle_patterns(
        &mut self,
        pattern_a: &str,
        pattern_b: &str,
        strength: f64,
    ) -> Result<(), OxirsError> {
        self.pattern_entanglement
            .entangled_patterns
            .insert(pattern_a.to_string(), pattern_b.to_string());
        self.pattern_entanglement
            .entanglement_strength
            .insert(pattern_a.to_string(), strength.clamp(0.0, 1.0));

        // Calculate correlation coefficient
        let correlation = strength * (2.0 * fastrand::f64() - 1.0);
        self.pattern_entanglement
            .correlation_coefficients
            .insert(format!("{pattern_a}_{pattern_b}"), correlation);

        Ok(())
    }

    /// Perform Bell test measurement
    pub fn bell_test_measurement(
        &mut self,
        pattern_a: &str,
        pattern_b: &str,
    ) -> Result<BellMeasurement, OxirsError> {
        let entanglement_strength = self
            .pattern_entanglement
            .entanglement_strength
            .get(pattern_a)
            .copied()
            .unwrap_or(0.0);

        // Generate Bell state based on entanglement strength
        let bell_state = if entanglement_strength > 0.8 {
            BellState::PhiPlus
        } else if entanglement_strength > 0.6 {
            BellState::PhiMinus
        } else if entanglement_strength > 0.4 {
            BellState::PsiPlus
        } else {
            BellState::PsiMinus
        };

        // Calculate Bell inequality violation (CHSH inequality)
        let bell_violation = (entanglement_strength * 2.0 * 2.0_f64.sqrt()).min(4.0);

        let measurement = BellMeasurement {
            pattern_a: pattern_a.to_string(),
            pattern_b: pattern_b.to_string(),
            outcome: bell_state,
            bell_violation,
        };

        self.pattern_entanglement
            .bell_measurements
            .push(measurement.clone());

        Ok(measurement)
    }

    /// Apply quantum error correction
    pub fn apply_quantum_error_correction(&mut self) -> Result<bool, OxirsError> {
        // Check if error correction is needed
        let fidelity = self.calculate_quantum_fidelity()?;
        if fidelity > (1.0 - self.error_correction.error_threshold) {
            return Ok(false); // No correction needed
        }

        // Detect errors using syndrome measurement
        let syndrome = self.detect_error_syndrome()?;

        // Apply correction if syndrome found
        if let Some(correction) = self.error_correction.syndrome_table.get(&syndrome) {
            let correction_clone = correction.clone();
            self.apply_correction(&correction_clone)?;
            return Ok(true);
        }

        // Try generic correction for unknown syndromes
        self.apply_generic_correction()?;
        Ok(true)
    }

    /// Detect error syndrome
    fn detect_error_syndrome(&self) -> Result<String, OxirsError> {
        // Simplified syndrome detection based on amplitude deviations
        let mut syndrome = String::new();

        for (state, amplitude) in &self.consciousness_superposition.state_amplitudes {
            let expected_amplitude =
                1.0 / (self.consciousness_superposition.state_amplitudes.len() as f64).sqrt();
            let deviation = (amplitude - expected_amplitude).abs();

            if deviation > 0.1 {
                syndrome.push_str(&format!("{state:?}_"));
            }
        }

        Ok(syndrome)
    }

    /// Apply specific correction
    fn apply_correction(&mut self, _correction: &str) -> Result<(), OxirsError> {
        // Simplified correction: renormalize and add small random phase
        self.renormalize_amplitudes()?;

        for (_, phase) in self.consciousness_superposition.state_phases.iter_mut() {
            *phase += (fastrand::f64() - 0.5) * 0.1;
        }

        Ok(())
    }

    /// Apply generic correction
    fn apply_generic_correction(&mut self) -> Result<(), OxirsError> {
        // Reset to equal superposition with small random perturbations
        let base_amplitude =
            1.0 / (self.consciousness_superposition.state_amplitudes.len() as f64).sqrt();

        for (_, amplitude) in self.consciousness_superposition.state_amplitudes.iter_mut() {
            *amplitude = base_amplitude + (fastrand::f64() - 0.5) * 0.05;
        }

        self.renormalize_amplitudes()?;
        Ok(())
    }

    /// Calculate quantum advantage over classical processing
    pub fn calculate_quantum_advantage(&self, patterns: &[AlgebraTriplePattern]) -> f64 {
        let num_patterns = patterns.len() as f64;

        // Quantum advantage scales with pattern complexity and entanglement
        let entanglement_factor = self.pattern_entanglement.entangled_patterns.len() as f64;
        let superposition_factor = self.consciousness_superposition.state_amplitudes.len() as f64;

        // Quantum speedup approximation
        let classical_complexity = num_patterns * num_patterns.log2();
        let quantum_complexity = num_patterns.sqrt() * superposition_factor.log2();

        if quantum_complexity > 0.0 {
            (classical_complexity / quantum_complexity) * (1.0 + entanglement_factor * 0.1)
        } else {
            1.0
        }
    }

    /// Get quantum state metrics for monitoring
    pub fn get_quantum_metrics(&self) -> QuantumMetrics {
        let total_entanglements = self.pattern_entanglement.entangled_patterns.len();
        let avg_entanglement_strength = if total_entanglements > 0 {
            self.pattern_entanglement
                .entanglement_strength
                .values()
                .sum::<f64>()
                / total_entanglements as f64
        } else {
            0.0
        };

        let coherence_quality = self.coherence_time / 1000.0; // normalized

        QuantumMetrics {
            total_entanglements,
            average_entanglement_strength: avg_entanglement_strength,
            coherence_time: self.coherence_time,
            coherence_quality,
            measurement_count: self.measurement_history.len(),
            bell_violations: self.pattern_entanglement.bell_measurements.len(),
            error_correction_rate: self.error_correction.correction_success_rate,
        }
    }
}

/// Quantum state metrics for monitoring
#[derive(Debug, Clone)]
pub struct QuantumMetrics {
    pub total_entanglements: usize,
    pub average_entanglement_strength: f64,
    pub coherence_time: f64,
    pub coherence_quality: f64,
    pub measurement_count: usize,
    pub bell_violations: usize,
    pub error_correction_rate: f64,
}

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

    #[test]
    fn test_quantum_consciousness_creation() {
        let quantum_state = QuantumConsciousnessState::new();
        assert_eq!(
            quantum_state
                .consciousness_superposition
                .state_amplitudes
                .len(),
            6
        );
        assert!(quantum_state.coherence_time > 0.0);
    }

    #[test]
    fn test_quantum_measurement() {
        let mut quantum_state = QuantumConsciousnessState::new();
        let measurement = quantum_state.measure_consciousness_state();
        assert!(measurement.is_ok());

        let measurement = measurement.expect("measurement should succeed");
        assert!(measurement.probability >= 0.0 && measurement.probability <= 1.0);
        assert!(measurement.fidelity >= 0.0 && measurement.fidelity <= 1.0);
    }

    #[test]
    fn test_pattern_entanglement() {
        let mut quantum_state = QuantumConsciousnessState::new();
        let result = quantum_state.entangle_patterns("pattern_a", "pattern_b", 0.8);
        assert!(result.is_ok());

        assert!(quantum_state
            .pattern_entanglement
            .entangled_patterns
            .contains_key("pattern_a"));
        assert_eq!(
            quantum_state
                .pattern_entanglement
                .entanglement_strength
                .get("pattern_a"),
            Some(&0.8)
        );
    }

    #[test]
    fn test_bell_measurement() {
        let mut quantum_state = QuantumConsciousnessState::new();
        quantum_state
            .entangle_patterns("pattern_a", "pattern_b", 0.9)
            .expect("operation should succeed");

        let bell_measurement = quantum_state.bell_test_measurement("pattern_a", "pattern_b");
        assert!(bell_measurement.is_ok());

        let measurement = bell_measurement.expect("Bell measurement should succeed");
        assert!(measurement.bell_violation >= 0.0 && measurement.bell_violation <= 4.0);
    }

    #[test]
    fn test_quantum_evolution() {
        let mut quantum_state = QuantumConsciousnessState::new();
        let initial_phases: Vec<f64> = quantum_state
            .consciousness_superposition
            .state_phases
            .values()
            .copied()
            .collect();

        let result = quantum_state.evolve_quantum_state(0.1);
        assert!(result.is_ok());

        let final_phases: Vec<f64> = quantum_state
            .consciousness_superposition
            .state_phases
            .values()
            .copied()
            .collect();
        assert_ne!(initial_phases, final_phases); // Phases should have evolved
    }

    #[test]
    fn test_error_correction() {
        let mut quantum_state = QuantumConsciousnessState::new();

        // Introduce some artificial error
        for (_, amplitude) in quantum_state
            .consciousness_superposition
            .state_amplitudes
            .iter_mut()
        {
            *amplitude *= 0.5; // Reduce amplitudes
        }

        let correction_applied = quantum_state.apply_quantum_error_correction();
        assert!(correction_applied.is_ok());
    }

    #[test]
    fn test_quantum_advantage_calculation() {
        let quantum_state = QuantumConsciousnessState::new();
        let patterns = vec![]; // Empty patterns for simplicity
        let advantage = quantum_state.calculate_quantum_advantage(&patterns);
        assert!(advantage >= 1.0); // Should at least equal classical
    }
}