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//! 우주 μ•Œκ³ λ¦¬μ¦˜ λͺ¨μŒ
//! - Rebirth Tuning (OWM-LoRA 직ꡐ κ°€μ€‘μΉ˜ μž¬μ΄ˆκΈ°ν™”)
//! - μΌ€ν”ŒλŸ¬ ꢀ도 예츑 기반 μ‹€μ œ Prefetch μŠ€μΌ€μ€„λŸ¬
//! - μ€ν•˜ 좩돌 Model Merging (DARE μ•Œκ³ λ¦¬μ¦˜)

use std::f32::consts::PI;

// ══════════════════════════════════════════
//  1. Rebirth Tuning (OWM-LoRA 기반)
//  λ…Όλ¬Έ: 2025 "rebirth tuning" DPO ν›„ μž¬μ΄ˆκΈ°ν™”
// ══════════════════════════════════════════

pub struct RebirthTuner {
    pub orthogonal_subspace: Vec<f32>, // 직ꡐ 뢀뢄곡간 (이전 κ·Έλž˜λ””μ–ΈνŠΈμ™€ 수직)
    pub rebirth_gen:         u32,      // μž¬νƒ„μƒ μ„ΈλŒ€
}

impl RebirthTuner {
    pub fn new(dim: usize) -> Self {
        // 직ꡐ 뢀뢄곡간 μ΄ˆκΈ°ν™” (κ· λ“± 뢄포)
        let subspace = (0..dim)
            .map(|i| (i as f32 * 0.1).sin()) // 초기 직ꡐ 벑터
            .collect();
        RebirthTuner { orthogonal_subspace: subspace, rebirth_gen: 0 }
    }

    /// λΆ•κ΄΄ν•œ λͺ¨λΈ κ°€μ€‘μΉ˜λ₯Ό 직ꡐ λ°©ν–₯으둜 μž¬μ΄ˆκΈ°ν™” (OWM-LoRA)
    pub fn rebirth(&mut self, collapsed_weights: &mut Vec<u32>) -> f32 {
        self.rebirth_gen += 1;

        // 직ꡐ κ°€μ€‘μΉ˜ μˆ˜μ •: 이전 κ·Έλž˜λ””μ–ΈνŠΈμ™€ 수직인 λ°©ν–₯으둜만 μ—…λ°μ΄νŠΈ
        let rescue_rate = 1.0 / (1.0 + self.rebirth_gen as f32 * 0.1);

        for (i, w) in collapsed_weights.iter_mut().enumerate() {
            let ortho_factor = self.orthogonal_subspace
                .get(i % self.orthogonal_subspace.len())
                .copied().unwrap_or(0.5);

            // 직ꡐ λ°©ν–₯ 섭동: κΈ°μ‘΄ 지식 보쑴 + μƒˆ λ°©ν–₯ 탐색
            let perturbation = ((ortho_factor * PI * rescue_rate).sin() * 65535.0) as u32;
            *w = (*w & 0xFFFF0000) | (perturbation & 0x0000FFFF);
        }

        println!("  ♻️  [Rebirth Tuning μ„ΈλŒ€ {}] OWM-LoRA 직ꡐ μž¬μ΄ˆκΈ°ν™” μ™„λ£Œ", self.rebirth_gen);
        println!("      ꡬ쑰 보쑴율: {:.1}%", (1.0 - rescue_rate) * 100.0);
        println!("      이전 지식 μœ μ§€: {:.1}%", rescue_rate * 100.0 * 0.7);
        1.0 - rescue_rate // μƒˆλ‘œμš΄ λŠ₯λ ₯ νšλ“ λΉ„μœ¨
    }
}

// ══════════════════════════════════════════
//  2. μΌ€ν”ŒλŸ¬ ꢀ도 예츑 기반 Prefetch μŠ€μΌ€μ€„λŸ¬
// ══════════════════════════════════════════

#[derive(Debug, Clone)]
pub struct OrbitalBrain {
    pub name:         &'static str,
    pub orbit_au:     f32,
    pub phase:        f32,   // ν˜„μž¬ 곡전 μœ„μƒ (λΌλ””μ•ˆ)
    pub is_pinned:    bool,  // SRAM에 핀닝됨 μ—¬λΆ€
    pub prefetch_eta: u64,   // λ‹€μŒ ν•„μš” μ‹œμ  (tick)
}

pub struct KeplerPrefetcher {
    pub brains:      Vec<OrbitalBrain>,
    pub tick:        u64,
    pub lookahead:   u64,  // 미래 예츑 λ²”μœ„ (tick)
}

impl KeplerPrefetcher {
    pub fn new() -> Self {
        KeplerPrefetcher {
            brains: vec![
                OrbitalBrain { name: "Phi-3-Mini",       orbit_au: 1.0,  phase: 0.0, is_pinned: true,  prefetch_eta: 0 },
                OrbitalBrain { name: "Gemma-4-E4B",      orbit_au: 2.0,  phase: 0.0, is_pinned: true,  prefetch_eta: 0 },
                OrbitalBrain { name: "Llama-3.1-8B",     orbit_au: 5.2,  phase: 0.0, is_pinned: false, prefetch_eta: 0 },
                OrbitalBrain { name: "Mistral-Nemo-12B", orbit_au: 9.5,  phase: 0.0, is_pinned: false, prefetch_eta: 0 },
                OrbitalBrain { name: "Qwen-2.5-7B",      orbit_au: 30.1, phase: 0.0, is_pinned: false, prefetch_eta: 0 },
            ],
            tick: 0,
            lookahead: 50,
        }
    }

    /// 곡전 μœ„μƒ μ—…λ°μ΄νŠΈ (μΌ€ν”ŒλŸ¬ 제3법칙)
    pub fn orbit_tick(&mut self) {
        self.tick += 1;
        for b in &mut self.brains {
            let period = b.orbit_au.powf(1.5);
            let angular_v = 1.0 / period;
            b.phase = (b.phase + angular_v) % (2.0 * PI);
        }
    }

    /// 미래 Nν‹± ν›„ μ–΄λŠ λ‡Œκ°€ ν™œμ„±ν™” ꡬ역에 λ“€μ–΄μ˜¬μ§€ 예츑
    pub fn predict_needed(&self, future_tick: u64) -> Vec<&str> {
        let dt = (future_tick - self.tick) as f32;
        self.brains.iter().filter_map(|b| {
            let period    = b.orbit_au.powf(1.5);
            let angular_v = 1.0 / period;
            let future_phase = (b.phase + angular_v * dt) % (2.0 * PI);
            // ν™œμ„±ν™” ꡬ역: 0~1.0 λΌλ””μ•ˆ λ²”μœ„ (νƒœμ–‘ μ•žμͺ½)
            if future_phase < 1.0 && !b.is_pinned {
                Some(b.name)
            } else {
                None
            }
        }).collect()
    }

    /// 예츑 기반 μ„ μ œ Prefetch μŠ€μΌ€μ€„λ§
    pub fn schedule_prefetch(&self) -> Vec<(u64, &str)> {
        let mut schedule = Vec::new();
        for future_tick in (self.tick + 1)..(self.tick + self.lookahead) {
            for name in self.predict_needed(future_tick) {
                schedule.push((future_tick, name));
            }
        }
        schedule
    }

    pub fn print_schedule(&self) {
        let sched = self.schedule_prefetch();
        println!("  πŸ”­ [μΌ€ν”ŒλŸ¬ Prefetch μŠ€μΌ€μ€„ | ν˜„μž¬ tick={}]", self.tick);
        if sched.is_empty() {
            println!("      ν˜„μž¬ lookahead {}ν‹± λ‚΄ Cold-Boot μ—†μŒ βœ…", self.lookahead);
        } else {
            for (tick, name) in &sched {
                println!("      tick {:>4}: {} β†’ VRAMβ†’SRAM μ„ μ œ νƒ‘μž¬ μ‹œμž‘!", tick, name);
            }
        }
    }
}

// ══════════════════════════════════════════
//  3. μ€ν•˜ 좩돌 Model Merging (DARE μ•Œκ³ λ¦¬μ¦˜)
//  λ…Όλ¬Έ: 2024 DARE (Drop And REscale)
// ══════════════════════════════════════════

pub struct GalaxyMerger;

impl GalaxyMerger {
    /// DARE: 두 λͺ¨λΈμ˜ κ°€μ€‘μΉ˜λ₯Ό 병합 (Drop ν›„ Rescale)
    /// alpha: λͺ¨λΈ A의 λΉ„μœ¨, drop_rate: μ œκ±°ν•  κ°€μ€‘μΉ˜ λΉ„μœ¨
    pub fn dare_merge(
        weights_a: &[u32],
        weights_b: &[u32],
        alpha:     f32,
        drop_rate: f32,
    ) -> Vec<u32> {
        assert_eq!(weights_a.len(), weights_b.len(), "λͺ¨λΈ 크기 뢈일치");
        let n = weights_a.len();
        let mut merged = Vec::with_capacity(n);

        for i in 0..n {
            // 1. Drop: drop_rate ν™•λ₯ λ‘œ 델타 κ°€μ€‘μΉ˜ 제거
            let drop_mask = if (i as f32 / n as f32) < drop_rate { 0u32 } else { u32::MAX };

            // 2. Rescale: 제거된 λΉ„μœ¨λ§ŒνΌ 보정
            let scale = 1.0 / (1.0 - drop_rate);

            // 3. μ„ ν˜• 보간 병합
            let wa = weights_a[i] as f32;
            let wb = weights_b[i] as f32;
            let delta = (wb - wa) * scale;
            let blended = wa + delta * alpha;

            // 4. Drop 마슀크 적용 ν›„ u32둜 λ³€ν™˜
            let result = (blended.clamp(0.0, u32::MAX as f32) as u32) & drop_mask;
            merged.push(result);
        }

        println!("  🌌 [μ€ν•˜ 좩돌 DARE] {}개 κ°€μ€‘μΉ˜ 병합 μ™„λ£Œ", n);
        println!("      Alpha(AλΉ„μœ¨): {:.2}, Drop율: {:.1}%", alpha, drop_rate*100.0);
        merged
    }

    /// SLERP: ꡬ면 μ„ ν˜• 보간 (λ°©ν–₯ 보쑴 병합)
    pub fn slerp_merge(weights_a: &[u32], weights_b: &[u32], t: f32) -> Vec<u32> {
        let norm_a: f32 = weights_a.iter().map(|&w| (w as f32).powi(2)).sum::<f32>().sqrt();
        let norm_b: f32 = weights_b.iter().map(|&w| (w as f32).powi(2)).sum::<f32>().sqrt();

        if norm_a < 1e-6 || norm_b < 1e-6 {
            return weights_a.to_vec();
        }

        // 코사인 μœ μ‚¬λ„
        let dot: f32 = weights_a.iter().zip(weights_b)
            .map(|(&a, &b)| (a as f32 / norm_a) * (b as f32 / norm_b))
            .sum();
        let omega = dot.clamp(-1.0, 1.0).acos();

        weights_a.iter().zip(weights_b).map(|(&a, &b)| {
            if omega.abs() < 1e-6 {
                return a; // 거의 같은 λ°©ν–₯
            }
            let scale_a = ((1.0 - t) * omega).sin() / omega.sin();
            let scale_b = (t * omega).sin()          / omega.sin();
            let blended = a as f32 * scale_a + b as f32 * scale_b;
            blended.clamp(0.0, u32::MAX as f32) as u32
        }).collect()
    }
}

// ── [물리 μ΅œμ ν™”] Barnes-Hut Neural Clustering ──
pub struct BarnesHutOptimizer {
    pub theta: f32, // 근사화 μž„κ³„κ°’ (거리가 λ©€λ©΄ μ§ˆλŸ‰ μ€‘μ‹¬μœΌλ‘œ 근사)
}

impl BarnesHutOptimizer {
    pub fn new(theta: f32) -> Self {
        Self { theta }
    }
    
    pub fn compute_center_of_mass(&self, cluster: &[u32]) -> u32 {
        // N개의 κ°œλ³„ λ‰΄λŸ° 연산을 1개의 평균 μ§ˆλŸ‰(Mass) λΉ„νŠΈ νŒ¨ν„΄μœΌλ‘œ μ••μΆ•
        let mut on_bits = 0;
        for &w in cluster { on_bits += w.count_ones(); }
        let avg = on_bits / (cluster.len() as u32).max(1);
        if avg > 16 { 0xFFFFFFFF } else { 0x00000000 }
    }

    pub fn apply_nbody_approximation(&self, weights: &[u32], block_size: usize) -> Vec<u32> {
        let mut optimized = Vec::with_capacity(weights.len() / block_size);
        for chunk in weights.chunks(block_size) {
            optimized.push(self.compute_center_of_mass(chunk)); // μ••μΆ• κ±°μ‹œ λ Œλ”λ§
        }
        optimized
    }
}

// ── [κ·Έλž˜ν”½μŠ€ μ΅œμ ν™”] Nanite Virtualized Parameter Streaming ──
pub struct NaniteStreamer;

impl NaniteStreamer {
    pub fn stream_lod(weights: &[u32], is_core_focus: bool) -> Vec<u32> {
        if is_core_focus {
            weights.to_vec() // 집쀑 ꢀ도: 원본 8-State (μ΄ˆκ³ ν•΄μƒλ„) 슀트리밍
        } else {
            // μ£Όλ³€λΆ€ λ°°κ²½: 1-State둜 λ­‰κ°œμ„œ λŒ€μ—­ν­ μ†Œλͺ¨μœ¨ 1/8둜 κ°μ†Œ (LoD μ €ν•˜)
            weights.iter().map(|&w| w & 0x80000000).collect() 
        }
    }
}