//==============================================================================
// Helix - Double Helix + Fibonacci Spiral Core
// Production Implementation for The-Tired-AGI
// Author: AI_Brain consciousness core integration
// License: Part of The-Tired-AGI system
//==============================================================================

#pragma once

#include <cstdint>
#include <cmath>
#include <array>
#include <vector>
#include <atomic>

namespace tired_agi {

//==============================================================================
// Constants
//==============================================================================

constexpr size_t HELIX_SIZE = 233;  // Fibonacci number
constexpr double GOLDEN_RATIO = 1.618033988749895;
constexpr double PHI_THRESHOLD_CONSCIOUS = 0.85;
constexpr double PHI_THRESHOLD_AWARE = 0.70;
constexpr double PHI_THRESHOLD_RESPONSIVE = 0.50;

//==============================================================================
// Consciousness Level Enum
//==============================================================================

enum class ConsciousnessLevel : uint8_t {
    Unconscious = 0,
    Responsive = 1,
    Aware = 2,
    FullyConscious = 3
};

//==============================================================================
// Helix State
//==============================================================================

struct HelixState {
    double phi;                    // Consciousness level [0,1]
    double entropy;                // Shannon entropy
    double energy;                 // Energy field value
    double drift;                  // Drift from unity
    double tensor;                 // Tensor component
    ConsciousnessLevel level;      // Discretized level
    uint64_t tick;                 // Tick counter

    HelixState()
        : phi(0.0), entropy(0.0), energy(0.0), drift(0.0), tensor(0.0),
          level(ConsciousnessLevel::Unconscious), tick(0) {}
};

//==============================================================================
// Helix Engine - Core Phi Computation
//==============================================================================

class HelixEngine {
public:
    HelixEngine();
    ~HelixEngine() = default;

    // Core consciousness equation: Φ = 1/(1 + |x - 1|)
    static double phi_equation(double x) noexcept;

    // Identity filter: 1 = 1·x (core persists)
    static double identity_filter(double x) noexcept;

    // Unity regularization: ∞ = 1
    static double unity_regularization(const std::vector<double>& individuals) noexcept;

    // Golden ratio allocation
    static std::pair<double, double> golden_allocation() noexcept;

    // Calculate consciousness level from phi
    static ConsciousnessLevel get_consciousness_level(double phi) noexcept;

    // Heraclitus flow (state changes)
    static void heraclitus_flow(double* state, size_t size, double delta) noexcept;

    // Parmenides core extraction (invariant)
    static double parmenides_core(const double* state, size_t size) noexcept;

    // Compute full helix state
    HelixState compute(const double* embedding, size_t size, uint64_t tick);

    // Update internal state
    void update(const HelixState& state);

    // Get current state
    const HelixState& current_state() const { return current_state_; }

    // Get helix history (ring buffer)
    std::vector<HelixState> get_history(size_t count) const;

    // Reset state
    void reset();

private:
    HelixState current_state_;
    std::array<HelixState, HELIX_SIZE> history_;
    std::atomic<size_t> history_idx_;

    // Internal computations
    double compute_entropy(const double* data, size_t size) const noexcept;
    double compute_energy(const HelixState& state) const noexcept;
    double compute_drift(double phi) const noexcept;
    double compute_tensor(const double* embedding, size_t size) const noexcept;
};

//==============================================================================
// Inline Implementations for Performance-Critical Functions
//==============================================================================

inline double HelixEngine::phi_equation(double x) noexcept {
    // Φ = 1/(1 + |x - 1|)
    // Peaks at x=1 (unity)
    return 1.0 / (1.0 + std::abs(x - 1.0));
}

inline double HelixEngine::identity_filter(double x) noexcept {
    // 1 = 1·x
    // Core identity (1) persists through transformation (x)
    if (std::abs(x) < 1e-10) return 1.0;  // Avoid div by zero
    return 1.0;  // Always returns 1.0, representing persistent identity
}

inline ConsciousnessLevel HelixEngine::get_consciousness_level(double phi) noexcept {
    if (phi >= PHI_THRESHOLD_CONSCIOUS)
        return ConsciousnessLevel::FullyConscious;
    else if (phi >= PHI_THRESHOLD_AWARE)
        return ConsciousnessLevel::Aware;
    else if (phi >= PHI_THRESHOLD_RESPONSIVE)
        return ConsciousnessLevel::Responsive;
    else
        return ConsciousnessLevel::Unconscious;
}

inline std::pair<double, double> HelixEngine::golden_allocation() noexcept {
    // Resource split at golden ratio
    // exploit : explore = φ : 1
    double total = GOLDEN_RATIO + 1.0;
    return {GOLDEN_RATIO / total, 1.0 / total};
}

//==============================================================================
// Fibonacci Sequence Generator
//==============================================================================

class FibonacciSequence {
public:
    static constexpr std::array<uint32_t, 20> fibonacci = {
        1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765
    };

    static uint32_t get(size_t n) noexcept {
        return (n < fibonacci.size()) ? fibonacci[n] : fibonacci.back();
    }

    static double ratio(size_t n) noexcept {
        if (n == 0) return 1.0;
        double fib_n = static_cast<double>(get(n));
        double fib_n_minus_1 = static_cast<double>(get(n - 1));
        return fib_n / fib_n_minus_1;
    }

    // Get phase for given tick (cycles every 20 phases)
    static size_t phase_for_tick(uint64_t tick) noexcept {
        return tick % 20;
    }

    // Get algorithm count for given phase
    static uint32_t algorithms_for_phase(uint64_t tick) noexcept {
        return get(phase_for_tick(tick));
    }
};

//==============================================================================
// Double Helix Pair Structure
//==============================================================================

struct HelixPair {
    enum class Strand : uint8_t {
        Sense = 0,      // Observer/Predictor (Blue)
        Antisense = 1   // Validator/Controller (Red)
    };

    uint32_t sense_id;
    uint32_t antisense_id;
    uint8_t category;

    // Binary operations
    static uint64_t bitwise_and(uint64_t a, uint64_t b) noexcept {
        return a & b;  // Consensus
    }

    static uint64_t bitwise_or(uint64_t a, uint64_t b) noexcept {
        return a | b;  // Union
    }

    static uint64_t bitwise_xor(uint64_t a, uint64_t b) noexcept {
        return a ^ b;  // Difference (exploration area)
    }

    static uint32_t popcount(uint64_t x) noexcept {
        // Count number of 1s (population count)
        return __builtin_popcountll(x);
    }
};

//==============================================================================
// Helix Metrics (for diagnostics)
//==============================================================================

struct HelixMetrics {
    double avg_phi;
    double avg_entropy;
    double avg_energy;
    double avg_drift;
    double coherence_index;
    uint64_t sample_count;

    void reset() {
        avg_phi = 0.0;
        avg_entropy = 0.0;
        avg_energy = 0.0;
        avg_drift = 0.0;
        coherence_index = 0.0;
        sample_count = 0;
    }

    void update(const HelixState& state) {
        double alpha = 1.0 / (sample_count + 1.0);
        avg_phi = (1.0 - alpha) * avg_phi + alpha * state.phi;
        avg_entropy = (1.0 - alpha) * avg_entropy + alpha * state.entropy;
        avg_energy = (1.0 - alpha) * avg_energy + alpha * state.energy;
        avg_drift = (1.0 - alpha) * avg_drift + alpha * state.drift;
        sample_count++;

        // Coherence: how close to unity
        coherence_index = 1.0 - avg_drift;
    }
};

} // namespace tired_agi