#!/usr/bin/env python3
"""
v11: SinGLU + DISCIPLINED Phase

v10 problem: φ(x) = π·tanh(Wφ·x) is too powerful. Phase std ~0.3 rad
destroys frequency stability on high-freq, memorization, OOD.

Three surgical fixes (from critique):
  1. Scale phase DOWN:     φ = 0.1·π·tanh(Wφ·x)    not full π
  2. Tie phase to features: sin(ω·(Wg·x + φ))       not sin(ω·Wg·x + φ)
  3. That's it. No gate, no freq mod, no extra paths.
"""

import torch, torch.nn as nn, torch.nn.functional as F
import numpy as np, math, json

SEEDS = [0, 1, 2]
def set_seed(s): torch.manual_seed(s); np.random.seed(s)

# ── Baselines ──

class VanillaMLP(nn.Module):
    def __init__(self,di,do,h,n):
        super().__init__()
        L=[]; p=di
        for _ in range(n): L+=[nn.Linear(p,h),nn.ReLU()]; p=h
        L.append(nn.Linear(p,do)); self.net=nn.Sequential(*L)
    def forward(self,x): return self.net(x)

class SinGLULayer(nn.Module):
    def __init__(self,di,do,mid,w0=30.):
        super().__init__()
        self.Wg=nn.Linear(di,mid,bias=False); self.Wv=nn.Linear(di,mid,bias=False)
        self.Wo=nn.Linear(mid,do,bias=True); self.w0=w0; self.ln=nn.LayerNorm(do)
        with torch.no_grad():
            self.Wg.weight.uniform_(-math.sqrt(6/di)/w0,math.sqrt(6/di)/w0)
            nn.init.xavier_uniform_(self.Wv.weight); nn.init.xavier_uniform_(self.Wo.weight)
    def forward(self,x): return self.ln(self.Wo(torch.sin(self.w0*self.Wg(x))*self.Wv(x)))

class SinGLUNet(nn.Module):
    def __init__(self,di,do,h,n,w0=30.):
        super().__init__()
        mid=max(2,int(h*2/3)); L=[]; p=di
        for _ in range(n): L.append(SinGLULayer(p,h,mid,w0)); p=h
        L.append(nn.Linear(p,do)); self.layers=nn.ModuleList(L)
    def forward(self,x):
        for l in self.layers: x=l(x)
        return x

# ── v11: Disciplined Phase ──

class v11Layer(nn.Module):
    """
    FIX 1: Scale phase to 0.1·π (not full π)
    FIX 2: Phase tied to feature space: sin(ω·(Wg·x + α·φ(x)))
    
    core = sin( ω · (Wg·x + 0.1·tanh(Wφ·x)) )
    y = LN( Wo( core ⊙ Wv·x ) )
    """
    def __init__(self, di, do, mid, w0=30., phase_scale=0.1):
        super().__init__()
        self.Wg=nn.Linear(di,mid,bias=False)
        self.Wv=nn.Linear(di,mid,bias=False)
        self.Wo=nn.Linear(mid,do,bias=True)
        self.Wphi=nn.Linear(di,mid,bias=True)  # phase (tied to feature space)
        self.w0=w0; self.ps=phase_scale; self.ln=nn.LayerNorm(do)
        with torch.no_grad():
            self.Wg.weight.uniform_(-math.sqrt(6/di)/w0,math.sqrt(6/di)/w0)
            nn.init.xavier_uniform_(self.Wv.weight); nn.init.xavier_uniform_(self.Wo.weight)
            nn.init.zeros_(self.Wphi.weight); nn.init.zeros_(self.Wphi.bias)
    
    def forward(self,x):
        g = self.Wg(x)
        phi = self.ps * torch.tanh(self.Wphi(x))  # small, bounded
        core = torch.sin(self.w0 * (g + phi))       # phase IN feature space
        return self.ln(self.Wo(core * self.Wv(x)))
    
    def get_phi(self,x):
        with torch.no_grad():
            return self.ps * torch.tanh(self.Wphi(x))

class v11Net(nn.Module):
    def __init__(self,di,do,h,n,w0=30.):
        super().__init__()
        mid=max(2,int(h*2/3)); L=[]; p=di
        for _ in range(n): L.append(v11Layer(p,h,mid,w0)); p=h
        L.append(nn.Linear(p,do)); self.layers=nn.ModuleList(L)
    def forward(self,x):
        for l in self.layers: x=l(x)
        return x
    def get_all_phi(self,x):
        P=[]; h=x
        for l in self.layers:
            if isinstance(l,v11Layer): P.append(l.get_phi(h)); h=l(h)
            else: h=l(h)
        return P

# ── Utils ──

def np_(m): return sum(p.numel() for p in m.parameters() if p.requires_grad)
def fh(di,do,n,t,cls,**kw):
    lo,hi,b=2,512,2
    while lo<=hi:
        mid=(lo+hi)//2; p=np_(cls(di,do,mid,n,**kw))
        if abs(p-t)<abs(np_(cls(di,do,b,n,**kw))-t): b=mid
        if p<t: lo=mid+1
        else: hi=mid-1
    return b

def tr_r(m,xtr,ytr,xte,yte,ep,lr,bs=256):
    o=torch.optim.Adam(m.parameters(),lr=lr); s=torch.optim.lr_scheduler.CosineAnnealingLR(o,T_max=ep)
    best=float('inf'); n=len(xtr)
    for e in range(ep):
        m.train(); p=torch.randperm(n)
        for i in range(0,n,bs):
            idx=p[i:i+bs]; loss=F.mse_loss(m(xtr[idx]),ytr[idx])
            o.zero_grad(); loss.backward(); torch.nn.utils.clip_grad_norm_(m.parameters(),1.); o.step()
        s.step()
        if(e+1)%max(1,ep//10)==0:
            m.eval()
            with torch.no_grad(): best=min(best,F.mse_loss(m(xte),yte).item())
    m.eval()
    with torch.no_grad(): best=min(best,F.mse_loss(m(xte),yte).item())
    return best

def tr_c(m,xtr,ytr,xte,yte,ep,lr,bs=256):
    o=torch.optim.Adam(m.parameters(),lr=lr); s=torch.optim.lr_scheduler.CosineAnnealingLR(o,T_max=ep)
    best=0; n=len(xtr)
    for e in range(ep):
        m.train(); p=torch.randperm(n)
        for i in range(0,n,bs):
            idx=p[i:i+bs]; loss=F.cross_entropy(m(xtr[idx]),ytr[idx])
            o.zero_grad(); loss.backward(); torch.nn.utils.clip_grad_norm_(m.parameters(),1.); o.step()
        s.step()
        if(e+1)%max(1,ep//10)==0:
            m.eval()
            with torch.no_grad(): best=max(best,(m(xte).argmax(1)==yte).float().mean().item())
    m.eval()
    with torch.no_grad(): best=max(best,(m(xte).argmax(1)==yte).float().mean().item())
    return best

# ── Data ──

def d_cx(n=1000):
    x=torch.rand(n,4)*2-1; return x,torch.exp(torch.sin(x[:,0]**2+x[:,1]**2)+torch.sin(x[:,2]**2+x[:,3]**2)).unsqueeze(1)
def d_ne(n=1000):
    x=torch.rand(n,2)*2-1; return x,(torch.sin(math.pi*(x[:,0]**2+x[:,1]**2))*torch.cos(3*math.pi*x[:,0]*x[:,1])).unsqueeze(1)
def d_sp(n=1000):
    t=torch.linspace(0,4*np.pi,n//2); r=torch.linspace(.3,2,n//2)
    x=torch.cat([torch.stack([r*torch.cos(t),r*torch.sin(t)],1),torch.stack([r*torch.cos(t+np.pi),r*torch.sin(t+np.pi)],1)])+torch.randn(n,2)*.05
    y=torch.cat([torch.zeros(n//2),torch.ones(n//2)]).long(); p=torch.randperm(n); return x[p],y[p]
def d_ch(n=1000):
    x=torch.rand(n,2)*2-1; return x,((torch.sin(3*math.pi*x[:,0])*torch.sin(3*math.pi*x[:,1]))>0).long()
def d_hf(n=1000):
    x=torch.linspace(-1,1,n).unsqueeze(1); return x,torch.sin(20*x)+torch.sin(50*x)+.5*torch.sin(100*x)
def d_mm(n=200): return torch.randn(n,8),torch.randn(n,4)
def d_ot(n=800):
    x=torch.rand(n,2)*2-1; return x,(torch.sin(3*math.pi*x[:,0])*torch.cos(3*math.pi*x[:,1])+x[:,0]*x[:,1]).unsqueeze(1)
def d_oe(n=300):
    x=torch.rand(n,2)+1; return x,(torch.sin(3*math.pi*x[:,0])*torch.cos(3*math.pi*x[:,1])+x[:,0]*x[:,1]).unsqueeze(1)

# ── Main ──

def main():
    print("="*80)
    print("  v11: SinGLU + DISCIPLINED Phase")
    print("  φ scaled to 0.1, tied to feature space: sin(ω·(Wg·x + 0.1·tanh(Wφ·x)))")
    print("="*80)
    
    N=3; Ms={'Vanilla':(VanillaMLP,{}),'SinGLU':(SinGLUNet,{'w0':None}),'v11':(v11Net,{'w0':None})}
    tasks=[
        ("Complex Fn","r",d_cx,4,1,5000,300,1e-3,30.,750),
        ("Nested Fn","r",d_ne,2,1,3000,300,1e-3,20.,750),
        ("Spiral","c",d_sp,2,2,3000,250,1e-3,15.,700),
        ("Checker","c",d_ch,2,2,3000,250,1e-3,20.,700),
        ("High-Freq","r",d_hf,1,1,8000,300,1e-3,60.,700),
        ("Memorize","r",d_mm,8,4,5000,400,1e-3,10.,200),
    ]
    
    R={}; PH={}
    for tn,tt,df,di,do,bud,ep,lr,w0,sp in tasks:
        print(f"\n{'━'*80}\n  {tn}  |  ~{bud:,}p\n{'━'*80}")
        hs={mn:fh(di,do,N,bud,mc,**{k:(w0 if v is None else v) for k,v in mk.items()}) for mn,(mc,mk) in Ms.items()}
        tr={}
        for mn,(mc,mk) in Ms.items():
            kw={k:(w0 if v is None else v) for k,v in mk.items()}; h=hs[mn]; sc=[]
            for seed in SEEDS:
                set_seed(seed); x,y=df()
                if sp>=len(x): xt,yt,xe,ye=x,y,x,y
                else: xt,yt,xe,ye=x[:sp],y[:sp],x[sp:],y[sp:]
                set_seed(seed+100); mdl=mc(di,do,h,N,**kw)
                s=tr_r(mdl,xt,yt,xe,ye,ep,lr) if tt=='r' else tr_c(mdl,xt,yt,xe,ye,ep,lr)
                sc.append(s)
                if mn=='v11' and seed==SEEDS[-1]:
                    mdl.eval()
                    with torch.no_grad():
                        pp=mdl.get_all_phi(xe[:100]); ap=torch.cat([p.flatten() for p in pp])
                        PH[tn]={'m':ap.mean().item(),'s':ap.std().item(),'mn':ap.min().item(),'mx':ap.max().item()}
            p=np_(mc(di,do,h,N,**kw))
            tr[mn]={'mean':np.mean(sc),'std':np.std(sc),'scores':sc,'params':p,'hidden':h}
        
        ir=tt=='r'
        best=min(tr,key=lambda k:tr[k]['mean']) if ir else max(tr,key=lambda k:tr[k]['mean'])
        met="MSE ↓" if ir else "Acc ↑"
        print(f"\n  {'M':<8} {'H':>3} {'P':>6} {met+' (mean±std)':>26}")
        print(f"  {'─'*46}")
        for mn,r in tr.items():
            m,s=r['mean'],r['std']
            ms=f"{m:.2e}±{s:.1e}" if(ir and m<.001) else(f"{m:.4f}±{s:.4f}" if ir else f"{m:.1%}±{s:.3f}")
            print(f"  {mn:<8} {r['hidden']:>3} {r['params']:>6,} {ms:>26}{' ★' if mn==best else ''}")
        print(f"  → {best}")
        if tn in PH: d=PH[tn]; print(f"    φ: std={d['s']:.4f} range=[{d['mn']:.3f},{d['mx']:.3f}]")
        R[tn]=tr
    
    # OOD
    print(f"\n{'━'*80}\n  OOD: [-1,1] → [1,2]\n{'━'*80}")
    OD={}
    for mn,(mc,mk) in Ms.items():
        kw={k:(20. if v is None else v) for k,v in mk.items()}; h=fh(2,1,N,5000,mc,**kw); ids,ods=[],[]
        for seed in SEEDS:
            set_seed(seed); xtr,ytr=d_ot()
            set_seed(seed+50); xi=torch.rand(200,2)*2-1; yi=(torch.sin(3*math.pi*xi[:,0])*torch.cos(3*math.pi*xi[:,1])+xi[:,0]*xi[:,1]).unsqueeze(1)
            set_seed(seed+50); xo,yo=d_oe()
            set_seed(seed+100); mdl=mc(2,1,h,N,**kw)
            si=tr_r(mdl,xtr,ytr,xi,yi,300,1e-3); mdl.eval()
            with torch.no_grad(): so=F.mse_loss(mdl(xo),yo).item()
            ids.append(si); ods.append(so)
        OD[mn]={'id':np.mean(ids),'ood':np.mean(ods),'deg':np.mean(ods)/max(np.mean(ids),1e-10),'p':np_(mc(2,1,h,N,**kw)),'is':np.std(ids),'os':np.std(ods)}
    
    bo=min(OD,key=lambda k:OD[k]['ood'])
    print(f"\n  {'M':<8} {'ID':>12} {'OOD':>12} {'Deg':>7}")
    print(f"  {'─'*42}")
    for mn,r in OD.items():
        print(f"  {mn:<8} {r['id']:>8.4f}±{r['is']:.3f} {r['ood']:>8.4f}±{r['os']:.3f} {r['deg']:>6.1f}x{' ★' if mn==bo else ''}")
    print(f"  → {bo}")
    R['OOD']={mn:{'mean':r['ood'],'std':r['os']} for mn,r in OD.items()}
    
    # Summary
    print(f"\n{'='*80}\n  SUMMARY: v11 vs SinGLU vs Vanilla\n{'='*80}")
    wc={k:0 for k in Ms}
    print(f"\n  {'Task':<14}",end="")
    for mn in Ms: print(f" {mn:>12}",end="")
    print(f" {'W':>8}")
    print(f"  {'─'*50}")
    for tn,t in R.items():
        sc={k:v['mean'] for k,v in t.items()}; mx=max(sc.values())
        ic=mx>.5 and mx<=1 and min(sc.values())>=0
        if min(sc.values())<.001: ic=False
        w=min(sc,key=sc.get) if(tn=='OOD' or not ic) else max(sc,key=sc.get)
        wc[w]+=1
        row=f"  {tn:<14}"
        for mn in Ms:
            s=sc[mn]
            if ic: row+=f" {s:>11.1%}"
            elif s<.001: row+=f" {s:>11.2e}"
            else: row+=f" {s:>11.4f}"
        row+=f" ->{'':>1}{w}"; print(row)
    print(f"\n  {'─'*50}")
    for mn,c in sorted(wc.items(),key=lambda x:-x[1]):
        print(f"    {mn:<8} {c} {'█'*c*4}")
    
    # Compare v10 vs v11 φ
    print(f"\n  φ DISCIPLINE CHECK:")
    print(f"  {'Task':<14} {'v11 φ std':>10} {'v10 was':>10} {'Change':>10}")
    print(f"  {'─'*46}")
    v10_stds={'Complex Fn':.192,'Nested Fn':.142,'Spiral':.242,'Checker':.207,'High-Freq':.321,'Memorize':.206}
    for tn,d in PH.items():
        v10s=v10_stds.get(tn,0)
        change=f"{d['s']/v10s:.1%}" if v10s>0 else "N/A"
        print(f"  {tn:<14} {d['s']:>10.4f} {v10s:>10.3f} {change:>10}")
    
    sv={'tasks':{},'ood':{},'phi':PH}
    for tn,t in R.items():
        sv['tasks'][tn]={mn:{'mean':float(r['mean']),'std':float(r.get('std',0)),
            'scores':[float(s) for s in r.get('scores',[r['mean']])],
            'params':r.get('params',0),'hidden':r.get('hidden',0)} for mn,r in t.items()}
    sv['ood']={mn:{k:float(v) if isinstance(v,(float,np.floating)) else v for k,v in r.items()} for mn,r in OD.items()}
    with open('/app/results_v11.json','w') as f: json.dump(sv,f,indent=2,default=str)
    print(f"\n  Saved to /app/results_v11.json")

if __name__=="__main__": main()