#!/usr/bin/env bash

# Convert the first page of a PDF to a JPEG image.
# Usage: ./pdf_to_jpg.sh <file.pdf>

set -euo pipefail

if [[ $# -ne 1 ]]; then
    echo "Usage: $0 <file.pdf>"
    exit 1
fi

INPUT_PDF="$1"

if [[ ! -f "$INPUT_PDF" ]]; then
    echo "Error: '$INPUT_PDF' not found."
    exit 1
fi

# Remove .pdf extension and prepend IMG_
BASE_NAME="$(basename "$INPUT_PDF" .pdf)"
OUTPUT_JPG="IMG_${BASE_NAME}.jpg"

echo "Converting first page of '$INPUT_PDF' to '$OUTPUT_JPG'..."

pdftoppm -f 1 -l 1 "$INPUT_PDF" | pnmtojpeg > "$OUTPUT_JPG"

echo "Done: $OUTPUT_JPG created."