# -*- coding: utf-8 -*-
"""Segment climb-rate analysis from test_events.log (2C buckets)."""
import re

rows = []
for ln in open("test_events.log", encoding="utf-8", errors="replace"):
    m = re.match(r"^([\d.]+) . ([\d.]+)  \[B5", ln)
    if m:
        rows.append((float(m.group(1)), float(m.group(2))))

if not rows:
    print("no frames")
    raise SystemExit

t0 = rows[0][0]
print(f"{len(rows)} frames, span {rows[-1][0]-t0:.0f}s")

segs = {}
for t, v in rows:
    segs.setdefault(int(v // 2) * 2, []).append((t, v))
for k in sorted(segs):
    seg = segs[k]
    dt = seg[-1][0] - seg[0][0]
    dv = seg[-1][1] - seg[0][1]
    rate = dv / dt if dt > 0 else 0
    print(f"  [{k:3d}-{k+2:3d}C] {dt:6.1f}s  rate={rate:+.3f} C/s  ({seg[0][1]:.1f}->{seg[-1][1]:.1f})")