"""Compare P2P offload vs baseline."""
import json, csv, statistics, os

def lat(path):
    rows = [json.loads(l) for l in open(path)]
    ok = [r for r in rows if not r.get("error")]
    ttfts = sorted([r["ttft_s"] for r in ok if r.get("ttft_s")])
    tpots = sorted([r["tpot_s"] for r in ok if r.get("tpot_s") and r["tpot_s"]>0])
    lats = sorted([r["latency_s"] for r in ok])
    p = lambda v,q: v[min(int(q*len(v)),len(v)-1)] if v else 0
    return {"ok": len(ok), "n": len(rows),
            "t50": p(ttfts,.5), "t90": p(ttfts,.9),
            "p50": p(tpots,.5), "p90": p(tpots,.9),
            "e50": p(lats,.5)}

def gpu(path):
    if not os.path.exists(path): return 0
    rows = list(csv.DictReader(open(path)))
    vals = [float(r["util_pct"]) for r in rows]
    return statistics.fmean(vals) if vals else 0

print("P2P OFFLOAD vs BASELINE (both fresh restart, 200 req)")
print("=" * 75)
fmt = "%-30s %6s %8s %8s %8s %8s %8s %6s"
print(fmt % ("Config","OK/N","TTFT50","TTFT90","TPOT50","TPOT90","E2E50","GPU%"))
print("-" * 75)

configs = [
    ("baseline_dash1", "Baseline (8 combined)"),
    ("p2p_offload", "P2P offload (HEAVY on diff GPU)"),
]

results = {}
for d, label in configs:
    mp = "outputs/%s/metrics.jsonl" % d
    if not os.path.exists(mp):
        print("  %s: NOT FOUND" % mp)
        continue
    s = lat(mp)
    g = gpu("outputs/%s/gpu_util.csv" % d)
    results[d] = s
    print(fmt % (label, "%d/%d" % (s["ok"],s["n"]),
        "%.3f" % s["t50"], "%.3f" % s["t90"],
        "%.3f" % s["p50"], "%.3f" % s["p90"],
        "%.3f" % s["e50"], "%.1f" % g))

if "baseline_dash1" in results and "p2p_offload" in results:
    b = results["baseline_dash1"]
    a = results["p2p_offload"]
    print()
    print("DELTA (P2P vs Baseline):")
    for label, bv, av in [
        ("TTFT p50", b["t50"], a["t50"]),
        ("TTFT p90", b["t90"], a["t90"]),
        ("TPOT p90", b["p90"], a["p90"]),
        ("E2E p50", b["e50"], a["e50"]),
    ]:
        d = (av/bv-1)*100 if bv > 0 else 0
        print("  %s: %.3f -> %.3f (%+.1f%%)" % (label, bv, av, d))