#!/usr/bin/env python3
"""
video_cycler.py — Toggle /video start/stop on the device every CYCLE_S seconds.

Pairs with sn65_monitor.py: this script provokes the flicker by cycling the
static-pink video stream, while sn65_monitor measures.  Press Ctrl+C to stop.
"""

import signal
import sys
import time
from datetime import datetime

import requests

DEVICE_BASE = "http://192.168.45.8:5000"
VIDEO_URL   = f"{DEVICE_BASE}/video"
CYCLE_S     = 10.0
HTTP_TIMEOUT_S = 3.0


def video_start() -> None:
    try:
        requests.put(VIDEO_URL,
                     json={"action": "start", "mode": "static-pink"},
                     timeout=HTTP_TIMEOUT_S)
    except requests.exceptions.RequestException as e:
        print(f"  video START failed: {e}")


def video_stop() -> None:
    try:
        requests.put(VIDEO_URL, json={"action": "stop"},
                     timeout=HTTP_TIMEOUT_S)
    except requests.exceptions.RequestException as e:
        print(f"  video STOP failed: {e}")


def main() -> None:
    # On Ctrl+C, make sure we leave video stopped.
    def _shutdown(*_):
        print("\nshutting down — video off")
        video_stop()
        sys.exit(0)
    signal.signal(signal.SIGINT,  _shutdown)
    signal.signal(signal.SIGTERM, _shutdown)

    print(f"VIDEO CYCLER — {CYCLE_S:.0f} s on / 0.5 s off (Ctrl+C to stop)\n")
    cycle = 0
    while True:
        cycle += 1
        ts = datetime.now().strftime("%H:%M:%S")
        print(f"[{ts}] cycle {cycle:04d}  video ON", flush=True)
        video_start()
        time.sleep(CYCLE_S)
        video_stop()
        time.sleep(0.5)


if __name__ == "__main__":
    main()