#!/usr/bin/env bash

brother_opts=()
scanner_mode='Black & White'
resolution='300'
source='Automatic Document Feeder(left aligned)'
duplex_source='Automatic Document Feeder(left aligned,Duplex)'

device="brother5:bus4;dev3"

valid_resolutions=("100" "150" "200" "300" "400" "600" "1200")

current_page=$(find "$PWD" -name "out*.pdf" | sort | tail -n 1);
read -r current_pageno <<<"${current_page//[^0-9]/ }"

current_pageno=${current_pageno:-0}

next_out_file="out$((current_pageno+1)).pdf"

scan() {
  while getopts "dr:" flag; do
    case ${flag} in
     d) 
       echo "Scanning duplex"
       source=$duplex_source
       ;;
     r)
       echo "Resolution=$OPTARG"
       if [[ ! " ${valid_resolutions[*]} " =~ [[:space:]]${OPTARG}[[:space:]] ]]; then
         echo "Resolution not supported"
         exit 1
       fi
       ;;
     b)
       echo "Black and white";
       ;;
     *)
       ;;
    esac
  done
}

case "$1" in
  scan)
    scan "${@:2}"
    exit 0

    if [ "$2" = "duplex" ]; then
      true
    fi

    # cat <<EOF 
    echo "Scanning to '$next_out_file'..."
    scanimage --device-name=$device --format=pdf --output-file="$next_out_file" \
      --mode="$scanner_mode" --resolution="$resolution" \
      --source="$source"
    ;;
  *)
    echo "Usage: scanbuddy"
    ;;
esac