#!/usr/bin/env python3
"""Record a scan session: scan mode + auto-exposure, saving every frame (fixed
640x296 colour PNG) and its embedded sensor record to records.csv.
Mouse mode is restored on exit (also on Ctrl-C)."""
import argparse
import csv
import os
import sys

sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))

from myscan import calib  # noqa: E402
from myscan.session import ScanSession, quiet_libjpeg  # noqa: E402

quiet_libjpeg()
import cv2  # noqa: E402


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("-d", "--duration", type=float, default=20)
    ap.add_argument("-o", "--out", default="scan")
    ap.add_argument("--video", default="/dev/video4")
    ap.add_argument("--target", type=float, default=200, help="auto-exposure target for paper (95th pct of brightest channel)")
    ap.add_argument("--exposure", type=int, help="fixed E6 value instead of auto-exposure")
    ap.add_argument("--gray", action="store_true", help="save grayscale frames")
    a = ap.parse_args()
    os.makedirs(a.out, exist_ok=True)

    rows = []
    s = ScanSession(a.video, a.target, a.exposure, gains=calib.load()["gains_rgb"])
    try:
        with s:
            print(f"scanning for {a.duration:.0f}s -> {a.out}/  (Ctrl-C to stop early)", flush=True)
            last = 0.0
            for t, n, im, rec in s.frames(color=not a.gray):
                if t >= a.duration:
                    break
                cv2.imwrite(f"{a.out}/f{n:05d}.png", im)
                mean = float(im.mean())
                rows.append([round(t, 4), n, rec.counter, *rec.v, rec.b14, rec.b15, rec.b16, rec.flags, s.e6,
                             round(mean, 1), rec.raw.hex()])
                if t - last >= 1:
                    print(f"t={t:5.1f}s frames={n:4d} E6={s.e6:3d} bright={mean:5.1f} "
                          f"l1=({rec.v[0]:#06x},{rec.v[1]:#06x}) l2=({rec.v[3]:#06x},{rec.v[4]:#06x}) "
                          f"sq={rec.b14},{rec.b15} flags={rec.flags:05b}", flush=True)
                    last = t
    except KeyboardInterrupt:
        pass
    finally:
        print("restore mouse mode:", getattr(s, "restored", None))
        with open(f"{a.out}/records.csv", "w", newline="") as fh:
            w = csv.writer(fh)
            w.writerow(["t", "frame", "counter", "v0", "v1", "v2", "v3", "v4", "v5",
                        "b14", "b15", "b16", "flags", "e6", "brightness", "raw"])
            w.writerows(rows)
        print(f"{len(rows)} frames saved to {a.out}/")


if __name__ == "__main__":
    main()