#!/usr/bin/env bash

set -eu

# $1: interval sec
# $2: repeat time

interval=$1 #sec
repeat_time=$2

HDMI_REGULATOR_PATH="/sys/class/regulator/regulator.18/state"
WAIT_TIME_SHORT=3s
WAIT_TIME_LONG=5s

# ==================== Check root ==================== #

if [ ${EUID:-${UID}} != 0 ] ; then
  echo "non-root. abort"
  exit
fi

for ((i=0; i < $repeat_time; i++)); do
  echo "======================================"
  echo "times:$i"
  echo "(1) HDMI toggle: disabling"

  echo "disabled" > ${HDMI_REGULATOR_PATH}

  sleep ${WAIT_TIME_SHORT}

  echo "======================================"
  echo "(2) HDMI toggle: enabling"

  echo "enabled" > ${HDMI_REGULATOR_PATH}

  sleepenh ${interval}

  echo "======================================"
  echo "(3) HDMI toggle: disabling"

  echo "disabled" > ${HDMI_REGULATOR_PATH}

  sleep ${WAIT_TIME_SHORT}

  echo "======================================"
  echo "(4) HDMI toggle: enabling"

  echo "enabled" > ${HDMI_REGULATOR_PATH}

  sleep ${WAIT_TIME_LONG}

  # hit the error around here
  
done