"""Find each segment boundary in the channel and check if errors reset there."""
from __future__ import annotations
import sys
from pathlib import Path

REPO = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(REPO))

from minimateplus.waveform_codec import decode_waveform_v2
from analysis_idf.recon import TARGET, TXT, load_sidecar_samples


def main():
    buf = TARGET.read_bytes()
    sc = load_sidecar_samples(TXT)
    decoded = decode_waveform_v2(buf[0x0f1f:])
    GEO_LSB = 0.0003

    for ch in ("Tran", "Vert", "Long"):
        sc_counts = [int(round(v / GEO_LSB)) for v in sc[ch]]
        dec = decoded[ch]
        # Find every transition where error becomes zero from nonzero (or grows from zero)
        # Print indices where dec resyncs back to exact match.
        n = min(len(sc_counts), len(dec))
        events = []
        prev_match = True
        for i in range(n):
            match = sc_counts[i] == dec[i]
            if match != prev_match:
                kind = "RESYNC" if match else "DIVERGE"
                events.append((i, kind, sc_counts[i], dec[i]))
                prev_match = match
        print(f"{ch}: {len(events)} transitions")
        for i, kind, sc_v, dec_v in events[:20]:
            print(f"  idx {i:4d}  {kind:8s}  sc={sc_v:6d}  dec={dec_v:6d}  diff={dec_v-sc_v:+d}")
        print()


if __name__ == "__main__":
    main()