#!/bin/bash

# Check if a PDF file is provided as an argument
if [ -z "$1" ]; then
    echo "Usage: $0 <input_pdf_file>"
    exit 1
fi

# Set input PDF filename from the argument
input_pdf="$1"
b=$(basename $input_pdf .pdf)

# Output directory for PNG files
output_dir="./output/"

# Ensure the output directory exists
mkdir -p "$output_dir"

echo "Converting $input_pdf to PNG files..."

# Use ImageMagick's convert command to loop through PDF pages and save each as a separate PNG file
string=$(pdfinfo "$input_pdf" | grep "Pages")
echo $string
number_regex="[0-9]+"
if [[ $string =~ $number_regex ]]; then
#  echo ${BASH_REMATCH[0]}
  number=${BASH_REMATCH[0]}
  echo "number of pages $number"
fi

for page in $(seq -w 1 $number ); do
    echo "Processing page $page"
    proc_page=$(($page - 1))
    echo "$proc_page"
    magick convert -density 150 "$input_pdf[${proc_page}]" "$output_dir/${b}_page_${page}.png"
done

echo "Conversion complete."