# -*- coding: utf-8 -*-
"""Parse live temperature frames from test_events.log tail (test writes it live)."""
import re
import sys

n = int(sys.argv[1]) if len(sys.argv) > 1 else 60
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))))
print(f"{len(rows)} temp frames total")
if len(rows) > 10:
    t1, v1 = rows[8]
    t2, v2 = rows[-1]
    print(f"{v1:.1f}C@{t1:.0f}s -> {v2:.1f}C@{t2:.0f}s  slope={(v2-v1)/(t2-t1):.3f} C/s")
    for t, v in rows[-8:]:
        print(f"  t={t:7.1f}s {v:6.1f}C")