"""Aggregate SEU campaign shards into per-cell statistics and sanity tables.

Catastrophe is defined as a non-finite render OR PSNR < 10 dB w.r.t. the clean
render at the same precision.
"""
import argparse
import glob
import json
import os

import numpy as np

FIELDS = ["means", "scales", "quats", "opacities", "sh0", "shN"]
BC = {0: "sign", 1: "exp", 2: "mantissa"}
CAT_PSNR = 10.0


def load_shards(campaign_dir, guard=False):
    rows = []
    for fp in sorted(glob.glob(os.path.join(campaign_dir, "shard_*.npz"))):
        is_guard = fp.endswith("_guard.npz")
        if is_guard != guard:
            continue
        d = np.load(fp, allow_pickle=True)
        a = d["data"]
        cols = list(d["cols"])
        meta = list(d["meta"])
        scene, prec = meta[0], meta[1]
        n = a.shape[0]
        rec = {c: a[:, i] for i, c in enumerate(cols)}
        rec["scene"] = np.array([scene] * n)
        rec["prec"] = np.array([prec] * n)
        rows.append(rec)
    if not rows:
        return None
    out = {}
    keys = list(rows[0].keys())
    for k in keys:
        out[k] = np.concatenate([r[k] for r in rows])
    return out


def catastrophe(rec):
    return (rec["cat"] > 0.5) | (rec["psnr"] < CAT_PSNR)


def aggregate(rec):
    """Per (scene,prec,field,bit) aggregate rows."""
    cat = catastrophe(rec).astype(float)
    out = []
    scenes = np.unique(rec["scene"])
    precs = np.unique(rec["prec"])
    for sc in scenes:
        for pr in precs:
            base = (rec["scene"] == sc) & (rec["prec"] == pr)
            if base.sum() == 0:
                continue
            for fid in range(6):
                for bit in sorted(set(rec["bit"][base].astype(int))):
                    m = base & (rec["field_id"] == fid) & (rec["bit"] == bit)
                    if m.sum() == 0:
                        continue
                    ps = rec["psnr"][m]
                    out.append({
                        "scene": str(sc), "prec": str(pr), "field": FIELDS[fid],
                        "bit": int(bit), "bitclass": BC[int(rec["bitclass"][m][0])],
                        "n": int(m.sum()),
                        "mean_psnr": float(ps.mean()), "median_psnr": float(np.median(ps)),
                        "mean_ssim": float(rec["ssim"][m].mean()),
                        "mean_lpips": float(rec["lpips"][m].mean()),
                        "median_lpips": float(np.median(rec["lpips"][m])),
                        "cat_rate": float(cat[m].mean()),
                        "mean_mse": float(rec["mse"][m].mean()),
                        "mean_fracchg": float(rec["fracchg"][m].mean()),
                    })
    return out


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--campaign", default="/root/seu/results/campaign")
    ap.add_argument("--out", default="/root/seu/results/agg")
    args = ap.parse_args()
    os.makedirs(args.out, exist_ok=True)

    rec = load_shards(args.campaign, guard=False)
    if rec is None:
        print("no shards found")
        return
    agg = aggregate(rec)
    with open(os.path.join(args.out, "aggregate.json"), "w") as f:
        json.dump(agg, f, indent=1)

    # sanity print: field x bitclass summary, fp32 only, averaged across scenes
    print(f"total rows: {len(rec['psnr'])}")
    print("\n=== fp32: local-impact metrics by field x bitclass (all scenes) ===")
    print("  maxerr = peak pixel error (L-inf); footprint = frac pixels changed >1/255")
    cat = catastrophe(rec).astype(float)
    fp32 = rec["prec"] == "fp32"
    hdr = (f"{'field':10s} {'class':9s} {'n':>6s} {'meanMaxErr':>10s} {'medMaxErr':>10s} "
           f"{'footprint%':>10s} {'p99foot%':>9s} {'meanLPIPS':>9s} {'catRate':>8s}")
    print(hdr)
    for fid in range(6):
        for bc in [0, 1, 2]:
            m = fp32 & (rec["field_id"] == fid) & (rec["bitclass"] == bc)
            if m.sum() == 0:
                continue
            fp = rec["fracchg"][m] * 100
            print(f"{FIELDS[fid]:10s} {BC[bc]:9s} {int(m.sum()):6d} "
                  f"{rec['maxerr'][m].mean():10.4f} {np.median(rec['maxerr'][m]):10.4f} "
                  f"{fp.mean():10.4f} {np.percentile(fp,99):9.4f} "
                  f"{rec['lpips'][m].mean():9.4f} {cat[m].mean():8.3f}")

    # mantissa bit-position scaling using LOCAL peak error (expect ~2^b -> log2 slope ~1/bit)
    print("\n=== fp32 scales mantissa: mean log2(maxerr) vs bit (expect ~+1/bit until saturation) ===")
    m0 = fp32 & (rec["field_id"] == 1) & (rec["bitclass"] == 2)
    bits = rec["bit"][m0].astype(int)
    for b in sorted(set(bits)):
        mm = m0 & (rec["bit"] == b)
        me = rec["maxerr"][mm]
        me = me[me > 0]
        if len(me) == 0:
            print(f"  bit {b:2d}: (all zero)")
            continue
        print(f"  bit {b:2d}: mean_log2(maxerr) {np.log2(me).mean():7.3f}  "
              f"meanMaxErr {rec['maxerr'][mm].mean():.5f}  footprint% {rec['fracchg'][mm].mean()*100:.4f}  n={mm.sum()}")
    print("\nSAVED", os.path.join(args.out, "aggregate.json"))


if __name__ == "__main__":
    main()