#!/bin/bash

pdf="$1"

size=$(pdfinfo "$pdf" | awk '/^Page size:/{

	a = $3

	b = $5

	if (a >= 419  && a <= 421  && b >= 594  && b <= 596 ) print "a5 portrait"

	if (a >= 594  && a <= 596  && b >= 419  && b <= 421 ) print "a5 paysage"

	if (a >= 594  && a <= 596  && b >= 841  && b <= 843 ) print "a4 portrait"

	if (a >= 841  && a <= 843  && b >= 594  && b <= 596 ) print "a4 paysage"

	if (a >= 841  && a <= 843  && b >= 1189 && b <= 1191) print "a3 portrait"

	if (a >= 1189 && a <= 1191 && b >= 841  && b <= 843 ) print "a3 paysage"

}')

pages=$(pdfinfo "$pdf" | awk '/Pages:/{print $2}')

output=$(mktemp --dry-run /dev/shm/XXXXXXXX.pdf)

recto=$(mktemp --directory /dev/shm/XXXXXXXX)

verso=$(mktemp --directory /dev/shm/XXXXXXXX)

if test "${size% *}" != "a5"; then

    gs -o $output -sDEVICE=pdfwrite -sPAPERSIZE=a5 -dFIXEDMEDIA -dPDFFitPage -dCompatibilityLevel=1.6 "$pdf"

else

    cp "$pdf" $output

fi

if test "${size#* }" = "portrait"; then

    pdfjam --paper a4paper --nup '2x1' --landscape --outfile $recto -- "$output" 1 "$output" 1

else

    pdfjam --paper a4paper --nup '1x2' --no-landscape --outfile $recto -- "$output" 1 "$output" 1

fi

if test $pages -eq 2; then

    if test "${size#* }" = "portrait"; then

        pdfjam --paper a4paper --nup '2x1' --landscape --outfile $verso -- "$output" 2 "$output" 2

    else

        pdfjam --paper a4paper --nup '1x2' --no-landscape --outfile $verso -- "$output" 2 "$output" 2

    fi

    pdftk A=$(find $recto -name "*pdf") B=$(find $verso -name "*pdf") cat A B output "$output"

else

    mv $(find $recto -name "*pdf") $output

fi

mv $output "${pdf%/*}/massicotable-${pdf##*/}"

rm -fr $recto $verso $output