#!/usr/bin/bash

set -e
cd "$(dirname "$0")/.."

echo
echo "-> Generating Thumbnails"

if ! command -v convert >/dev/null; then
  echo "Could not find ImageMagick."
  echo "Please install it with 'sudo apt install imagemagick' and"
  echo "enable PDF features in '/etc/ImageMagick-*/policy.xml'."
  exit 1
fi

pdfs=()

get_image_path () {
  echo "$1" | sed -r 's/(.+)\/pdf\/([^/]+)\.pdf/\1\/images\/\2.jpg/'
}

for file in assets/files/*/pdf/*.pdf; do
  image="$(get_image_path "$file")"
  if [ ! -f "$image" ]; then
    pdfs+=("$file")
  fi
done

i=1
n="${#pdfs[@]}"

if [ "$n" == "0" ]; then
  echo "(Nothing to do)"
else
  for file in "${pdfs[@]}"; do
    printf "Generating Thumbnail $i/$n for $file... "
    convert -resize 500x700! -colorspace RGB -density 96 -quality 85 "$file[0]" "$(get_image_path "$file")"
    printf "Done\n"
    i=$(( i + 1 ))
  done
fi