import time, os, re, shutil
os.chdir("/home/yurenh2/ept/ep_run")
LOG, CK = "runs/ep_redx.log", "runs/ep_redx.pt"
os.makedirs("runs/redx_traj", exist_ok=True)
seen = set(); t0 = time.time()
while time.time() - t0 < 8 * 3600:
    time.sleep(15)
    try: ls = [l for l in open(LOG) if l.startswith("step")]
    except Exception: continue
    if not ls: continue
    m = re.search(r"step\s+(\d+)/.*res=([\d.eE+-]+)", ls[-1])   # \s+ : log right-aligns the step number
    if not m: continue
    step = int(m.group(1)); res = float(m.group(2))
    if step not in seen and os.path.exists(CK) and os.path.getsize(CK) > 1e6:
        try:
            shutil.copy2(CK, f"runs/redx_traj/s{step}.pt"); seen.add(step)
            print(f"froze s{step} res={res:.2e}", flush=True)
        except Exception: pass
    if res > 0.25:
        print(f"DIVERGED step {step} res={res:.2e}; frozen={sorted(seen)}", flush=True); break
print("freezer done; frozen:", sorted(seen))