/* ============================================================================
 * INTERMITTENT FORCING CYCLE v1.0 - Metabolic Pulses
 * Protocol: 12s noise injection, 188s relaxation (200s cycle)
 * Goal: Break symmetry, induce inverse cascade, find redline
 * ============================================================================ */

#include <cuda_runtime.h>
#include <cufft.h>
#include <nvml.h>
#include <curand_kernel.h>
#include <cstdio>
#include <cstdlib>
#include <cstdint>
#include <cmath>
#include <chrono>
#include <vector>
#include <cstring>
#include <fstream>

/* ---- Grid ---------------------------------------------------------------- */
#define NX    1024
#define NY    1024
#define NN    (NX * NY)
#define Q     9
#define BLOCK 256
#define GBLK(n) (((n) + BLOCK - 1) / BLOCK)

/* ---- Intermittent Forcing Protocol -------------------------------------- */
#define CYCLE_TOTAL_SECONDS 200.0f
#define PULSE_DURATION_SECONDS 12.0f
#define RELAXATION_DURATION_SECONDS 188.0f
#define STEPS_PER_SECOND 5000.0f

#define PULSE_STEPS (int)(PULSE_DURATION_SECONDS * STEPS_PER_SECOND)      // ~60,000 steps
#define RELAXATION_STEPS (int)(RELAXATION_DURATION_SECONDS * STEPS_PER_SECOND) // ~940,000 steps
#define CYCLE_STEPS (PULSE_STEPS + RELAXATION_STEPS)                      // ~1,000,000 steps

#define INITIAL_NOISE_AMPLITUDE 0.20f
#define NOISE_AMPLITUDE_INCREMENT 0.05f
#define NOISE_INTERVAL 10  // Steps between noise injections during pulse

/* ---- Metabolic Parameters ----------------------------------------------- */
#define OMEGA 1.85f
#define MAX_CYCLES 36  // 2 hours = 36 cycles of 200s each
#define AMPLITUDE_RAMP_CYCLES 6  // Increase amplitude every 6 cycles (20 minutes)

/* ---- Spectrum ----------------------------------------------------------- */
#define NX2   (NX / 2 + 1)
#define KMAX  (NX / 2)
#define NK    (KMAX + 1)

/* ---- Metabolic Pulse Analytics ----------------------------------------- */
typedef struct {
    uint32_t cycle;
    float noise_amplitude;
    double entropy_before_pulse;
    double entropy_after_pulse;
    double entropy_after_relaxation;
    double coherence_recovery_rate;
    double inverse_cascade_strength;
    double peak_k_evolution[3];  // Before, during, after
    double spectral_slope_evolution[3];
    uint64_t timestamp_start;
    uint64_t timestamp_end;
} PulseAnalytics;

/* ---- Crystallization Header -------------------------------------------- */
typedef struct {
    uint32_t magic;
    uint32_t version;
    uint32_t grid_x;
    uint32_t grid_y;
    uint32_t q;
    uint32_t step;
    float omega;
    float viscosity;
    float entropy;
    float slope;
    float kx0_fraction;
    float total_energy;
    uint32_t peak_k;
    uint32_t thermal_state;
    uint64_t timestamp;
    uint64_t checksum_data;
    uint64_t checksum_header;
    char hostname[64];
    char user[32];
    char annotation[256];
    PulseAnalytics pulse_data;
    uint32_t reserved[8];
} CrystallizationHeader;

#define CRYSTAL_MAGIC 0x43525953
#define CRYSTAL_VERSION 0x01000010  // v1.0.16 for intermittent forcing

/* ---- D2Q9 --------------------------------------------------------------- */
__constant__ int   d_ex[Q] = { 0, 1, 0,-1, 0, 1,-1,-1, 1 };
__constant__ int   d_ey[Q] = { 0, 0, 1, 0,-1, 1, 1,-1,-1 };
__constant__ float d_w[Q]  = { 4.f/9, 1.f/9, 1.f/9, 1.f/9, 1.f/9,
                               1.f/36,1.f/36,1.f/36,1.f/36 };
static const int h_ex[Q] = { 0, 1, 0,-1, 0, 1,-1,-1, 1 };
static const int h_ey[Q] = { 0, 0, 1, 0,-1, 1, 1,-1,-1 };

/* ---- Metabolic Pulse Kernel -------------------------------------------- */
__global__ void metabolic_pulse_injection(float* f, int nx, int ny, float amplitude, 
                                         unsigned int seed, int step, int pulse_phase) {
    const int idx = blockIdx.x * blockDim.x + threadIdx.x;
    const int N = nx * ny;
    if (idx >= N) return;
    
    // Only inject noise during pulse phase
    if (pulse_phase == 1 && (step % NOISE_INTERVAL == 0)) {
        curandState state;
        curand_init(seed + idx + step * 10000, 0, 0, &state);
        
        for (int i = 0; i < Q; i++) {
            float noise = amplitude * (curand_uniform(&state) - 0.5f);
            f[i * N + idx] += noise;
        }
    }
}

/* ---- Standard LBM Kernels ---------------------------------------------- */
__global__ void lbm_collide_stream(const float* __restrict__ f_src, float* __restrict__ f_dst,
    float* __restrict__ rho_out, float* __restrict__ ux_out,
    float* __restrict__ uy_out, float omega, int nx, int ny) {
    const int idx = blockIdx.x * blockDim.x + threadIdx.x;
    const int N = nx * ny;
    if (idx >= N) return;
    const int x = idx % nx, y = idx / nx;

    float fl[Q];
    for (int i = 0; i < Q; i++) {
        int sx = (x - d_ex[i] + nx) % nx;
        int sy = (y - d_ey[i] + ny) % ny;
        fl[i] = f_src[i * N + sy * nx + sx];
    }

    float rho = 0.f, ux = 0.f, uy = 0.f;
    for (int i = 0; i < Q; i++) {
        rho += fl[i];
        ux += (float)d_ex[i] * fl[i];
        uy += (float)d_ey[i] * fl[i];
    }
    float inv = 1.f / fmaxf(rho, 1e-10f);
    ux *= inv; uy *= inv;
    rho_out[idx] = rho; ux_out[idx] = ux; uy_out[idx] = uy;

    const float u2 = ux * ux + uy * uy;
    for (int i = 0; i < Q; i++) {
        float eu = (float)d_ex[i] * ux + (float)d_ey[i] * uy;
        float feq = d_w[i] * rho * (1.f + 3.f*eu + 4.5f*eu*eu - 1.5f*u2);
        f_dst[i * N + idx] = fl[i] - omega * (fl[i] - feq);
    }
}

/* ---- Spectrum Analysis Functions --------------------------------------- */
struct SpectrumStats {
    double total_energy;
    double spectral_entropy;
    double peak_k;
    double slope;
    int num_modes;
    double kx0_frac;
    double coherence;  // Q value
};

SpectrumStats analyze_spectrum(const double* spec, int nk) {
    SpectrumStats s;
    s.total_energy = 0;
    double peak_p = 0;
    s.peak_k = 0;
    
    for (int k = 1; k < nk; k++) {
        s.total_energy += spec[k];
        if (spec[k] > peak_p) { peak_p = spec[k]; s.peak_k = k; }
    }
    
    s.spectral_entropy = 0;
    s.num_modes = 0;
    if (s.total_energy > 0) {
        for (int k = 1; k < nk; k++) {
            double p = spec[k] / s.total_energy;
            if (p > 0) s.spectral_entropy -= p * log2(p);
            if (p > 0.01) s.num_modes++;
        }
    }
    
    // Coherence calculation (Q value)
    double energy_k1 = (nk > 1) ? spec[1] : 0;
    s.coherence = (s.total_energy > 0) ? energy_k1 / s.total_energy : 0;
    
    // Spectral slope
    double sx = 0, sy = 0, sxx = 0, sxy = 0;
    int n = 0;
    for (int k = 2; k <= 100 && k < nk; k++) {
        if (spec[k] > 0) {
            double lk = log((double)k), le = log(spec[k]);
            sx += lk; sy += le; sxx += lk*lk; sxy += lk*le; n++;
        }
    }
    s.slope = (n > 2) ? ((double)n * sxy - sx * sy) / ((double)n * sxx - sx * sx) : 0;
    s.kx0_frac = 0;
    
    return s;
}

/* ---- Inverse Cascade Detection ----------------------------------------- */
double calculate_inverse_cascade_strength(const double* spec_before, const double* spec_after, int nk) {
    double cascade_strength = 0.0;
    
    // Measure energy transfer from small to large scales
    // Inverse cascade: energy moves from high k to low k
    for (int k = 2; k < nk; k++) {
        double energy_loss = spec_before[k] - spec_after[k];
        if (energy_loss > 0) {
            // This energy should appear at lower k
            for (int lower_k = 1; lower_k < k; lower_k++) {
                double energy_gain = spec_after[lower_k] - spec_before[lower_k];
                if (energy_gain > 0) {
                    cascade_strength += energy_gain;
                }
            }
        }
    }
    
    return cascade_strength;
}

/* ---- Main Function ----------------------------------------------------- */
int main() {
    printf("\n");
    printf("=======================================================================\n");
    printf("  INTERMITTENT FORCING CYCLE v1.0 - Metabolic Pulses\n");
    printf("  Protocol: 12s noise (cognitive), 188s relaxation (metabolic)\n");
    printf("  Cycle: 200s (3.33 minutes), Total: 2 hours (36 cycles)\n");
    printf("  Initial Aₙ: %.2f, Increment: +%.2f every 20 minutes\n", 
           INITIAL_NOISE_AMPLITUDE, NOISE_AMPLITUDE_INCREMENT);
    printf("  Goal: Break symmetry, induce inverse cascade, find redline\n");
    printf("=======================================================================\n\n");
    
    // Analytics logging
    std::ofstream analytics_log("C:\\fractal_nvme_test\\metabolic_pulses_analytics.csv");
    analytics_log << "cycle,noise_amplitude,entropy_before,entropy_after_pulse,entropy_after_relax,";
    analytics_log << "coherence_recovery_rate,inverse_cascade_strength,peak_k_before,peak_k_after,";
    analytics_log << "slope_before,slope_after,timestamp_start,timestamp_end\n";
    
    printf("[PROTOCOL] Starting Phase 1: Integrity & Baseline (15:45 - 16:00)\n");
    printf("[PROTOCOL] Loading latest 5.8-bit crystal for sector-alignment check...\n");
    
    // TODO: Implement crystal loading and integrity check
    // For now, start from default state
    
    printf("[PROTOCOL] Phase 2: Intermittent Forcing (16:00 - 17:15)\n");
    printf("[PROTOCOL] Metabolic pulses: 12s @ Aₙ=%.2f, 188s relaxation\n", INITIAL_NOISE_AMPLITUDE);
    printf("[PROTOCOL] Monitoring: Entropy rebound, inverse cascade, coherence recovery\n\n");
    
    float current_amplitude = INITIAL_NOISE_AMPLITUDE;
    int amplitude_ramp_counter = 0;
    
    for (int cycle = 0; cycle < MAX_CYCLES; cycle++) {
        printf("[CYCLE %02d/%02d] Starting at amplitude %.2f\n", 
               cycle + 1, MAX_CYCLES, current_amplitude);
        
        // Record start time
        auto cycle_start = std::chrono::steady_clock::now();
        
        // Phase A: Measure baseline (before pulse)
        printf("  Phase A: Baseline measurement...\n");
        // TODO: Capture spectrum and entropy
        
        // Phase B: Metabolic pulse (12 seconds)
        printf("  Phase B: Metabolic pulse (12s @ Aₙ=%.2f)...\n", current_amplitude);
        // TODO: Inject noise for PULSE_STEPS
        
        // Phase C: Relaxation (188 seconds)
        printf("  Phase C: Relaxation (188s, watching for inverse cascade)...\n");
        // TODO: Run pure LBM, monitor spectrum evolution
        
        // Phase D: Analytics and recording
        printf("  Phase D: Analytics capture...\n");
        // TODO: Calculate entropy rebound, coherence recovery, inverse cascade
        
        // Record end time
        auto cycle_end = std::chrono::steady_clock::now();
        double cycle_duration = std::chrono::duration<double>(cycle_end - cycle_start).count();
        
        printf("  Cycle complete: %.1f seconds (target: 200.0s)\n", cycle_duration);
        printf("  Entropy rebound: [TODO] bits/s\n");
        printf("  Inverse cascade strength: [TODO]\n");
        printf("  Coherence (Q): [TODO]\n\n");
        
        // Ramp amplitude every AMPLITUDE_RAMP_CYCLES cycles (20 minutes)
        amplitude_ramp_counter++;
        if (amplitude_ramp_counter >= AMPLITUDE_RAMP_CYCLES) {
            current_amplitude += NOISE_AMPLITUDE_INCREMENT;
            amplitude_ramp_counter = 0;
            printf("[AMPLITUDE RAMP] Increased to Aₙ=%.2f\n\n", current_amplitude);
            
            // Check for redline (coherence < 0.10)
            // TODO: Implement coherence check
        }
        
        // Check for system shatter (NaN/divergence)
        // TODO: Implement stability check
        
        // Crystallize state at key cycles
        if ((cycle + 1) % 6 == 0) {  // Every 20 minutes
            printf("[CRYSTALLIZATION] Saving state at cycle %d, Aₙ=%.2f\n", 
                   cycle + 1, current_amplitude);
            // TODO: Save crystal with pulse analytics
        }
    }
    
    printf("[PROTOCOL] Phase 3: Limit Determination (17:15 - 17:45)\n");
    printf("[PROTOCOL] Redline identified at Aₙ=[TODO]\n");
    printf("[PROTOCOL] Maximum sustainable entropy: [TODO] bits\n");
    printf("[PROTOCOL] Coherence breakdown point: Q < 0.10 at Aₙ=[TODO]\n\n");
    
    analytics_log.close();
    
    printf("=======================================================================\n");
    printf("  INTERMITTENT FORCING COMPLETE\n");
    printf("  Analytics saved: C:\\fractal_nvme_test\\metabolic_pulses_analytics.csv\n");
    printf("  Crystals saved: C:\\fractal_nvme_test\\metabolic_pulses_*.crys\n");
    printf("  Redline defined: [TODO]\n");
    printf("=======================================================================\n");
    
    return 0;
}