#!/usr/bin/env bash

set -eu -o pipefail

dir="$1"

if [ ! -d "$dir" ]; then
	echo "$dir not available or not a dir" 2>&1
	exit 1
fi

exec 3>&0

while IFS='' read -r -d '' file; do
	echo "Openning $file"
	mupdf "$file"
	read -u 3 -r -p "Rename to (without ext.) [empty does nothing]: " newname
	mupdf "$file"
	read -u 3 -r -p 'Trim to one page [yN]: ' onepage
	if [ "$onepage" = y -a ! -z "$newname" ]; then
		(set -x; paperjam 'select { 1 }' "$file" "$dir/$newname.pdf")
		rm -v "$file"
	elif [ "$onepage" = y ]; then
		tempname="$(mktemp -p "$dir")"
		(set -x; paperjam 'select { 1 }' "$file" "$tempname")
		mv -v "$tempname" "$file"
	elif [ ! -z "$newname" ]; then
		mv -v "$file" "$dir/$newname.pdf"
	fi
done < <(find "$dir" -maxdepth 1 -type f -iname '*.pdf' -print0)