#!/bin/bash
#
# Generate thumbnail versions of puzzle images.
# Run from the assets/images/puzzles/ directory.
#
# Requires ImageMagick (convert command).
#   Ubuntu/Debian: sudo apt install imagemagick
#   macOS:         brew install imagemagick
#
# Thumbnails are 576x324 (16:9) and named thumb_<original_filename>.

THUMB_WIDTH=576
THUMB_HEIGHT=324

cd "$(dirname "$0")" || exit 1

if ! command -v convert &> /dev/null; then
  echo "Error: ImageMagick is not installed."
  echo "  Ubuntu/Debian: sudo apt install imagemagick"
  echo "  macOS:         brew install imagemagick"
  exit 1
fi

count=0
skipped=0

for file in *; do
  # Skip non-files, thumbnails, and this script
  [ -f "$file" ] || continue
  case "$file" in
    thumb_*|*.sh) continue ;;
  esac

  # Check it's actually an image
  mime=$(file --mime-type -b "$file")
  case "$mime" in
    image/*) ;;
    *) continue ;;
  esac

  thumb="thumb_${file}"

  if [ -f "$thumb" ]; then
    echo "SKIP  $thumb (already exists)"
    skipped=$((skipped + 1))
    continue
  fi

  convert "$file" -resize "${THUMB_WIDTH}x${THUMB_HEIGHT}!" -strip "$thumb"
  echo "MADE  $thumb"
  count=$((count + 1))
done

echo ""
echo "Done. Created: $count, Skipped: $skipped"