#!/bin/bash
# array with filter positions (0 - hole, 1 - B, 2 - V, 3 - R, 4 - r')
POSITIONS=( 1 2 3 )
# array with expositions (in milliseconds!!!) for each position from POSITIONS
EXPTIME=( 600000 300000 400000 )
# array with focus (mm*10000) for each position
FOCUS=( 45000 45500 45300 )

# array size
len=${#POSITIONS[*]}

__x=0
function chkweather(){
  local y=$__x
  __x=$((__x+1))
  return $y
}

function move_focuser(){
  echo "move focuser to $1"
}

function move_turret(){
  echo "move turret to $1"
}

function capture_frame(){
  echo "capture frame with exposition $1 to file prefix $2"
}

function take_image(){
  for (( i=0; i<$len; i++ )); do
    move_focuser ${FOCUS[i]}
    move_turret ${POSITIONS[i]}
    capture_frame ${EXPTIME[i]} filename
  done
}

while chkweather; do
  take_image
done

echo "stop_observations"