#!/bin/bash

fast_mode=false

set -- $(getopt fu "$@")
while [ $# -gt 0 ]; do
	case "$1" in
		-f)
			fast_mode=true
			;;
		--)
			shift
			break
			;;
		-*)
			echo "$0: error - unrecognized option $1" 1>&2
			exit 1
			;;
		*)
			break
	esac
	shift
done

PDFTEX_OPT="-shell-escape -halt-on-error"

set -ex

if ! $fast_mode; then
	! md5sum *.aux *.snm *.nav *.toc > autoloop.old
	make -C PRESENTATION_Intro
    sed -i 's#/CreationDate (D:[^)]\+)#/CreationDate ('${PDF_DATE}')#' PRESENTATION_Intro/*.pdf
	make -C PRESENTATION_ExSyn
    sed -i 's#/CreationDate (D:[^)]\+)#/CreationDate ('${PDF_DATE}')#' PRESENTATION_ExSyn/*.pdf
	make -C PRESENTATION_ExAdv
    sed -i 's#/CreationDate (D:[^)]\+)#/CreationDate ('${PDF_DATE}')#' PRESENTATION_ExAdv/*.pdf
	make -C PRESENTATION_ExOth
    sed -i 's#/CreationDate (D:[^)]\+)#/CreationDate ('${PDF_DATE}')#' PRESENTATION_ExOth/*.pdf
	make -C PRESENTATION_Prog
fi

set -ex

echo ${PDF_DATE}
pdflatex $PDFTEX_OPT '\pdfinfo{/CreationDate('${PDF_DATE}')/ModDate('${PDF_DATE}')}\input{presentation.tex}'

if ! $fast_mode; then
	while
		md5sum *.aux *.snm *.nav *.toc > autoloop.new
		! cmp autoloop.old autoloop.new
	do
		cp autoloop.new autoloop.old
        pdflatex $PDFTEX_OPT '\pdfinfo{/CreationDate('${PDF_DATE}')/ModDate('${PDF_DATE}')}\input{presentation.tex}'
	done

	rm -f autoloop.old
	rm -f autoloop.new
fi

grep -av '^/ID \[\(<[0-9A-F]\{32\}>\) \1]$' presentation.pdf > presentation.pdf.without_pdf_id
mv -f presentation.pdf.without_pdf_id presentation.pdf