#!/bin/bash -e

pd=$HOME/.schmierpapier
db=$pd/db
locf=$pd/loc
baseurlf=$pd/baseurl

# check env
fail() { echo "$1" >&2; exit -1; }
[ -e $baseurlf ] || fail "base URL undefined - $baseurlf not found"
[ -e $locf ] || fail "location undefined - $locf not found"
exec >$pd/log.std 2>$pd/log.err

# dynamic content
id=$(dd if=/dev/urandom bs=1 count=64 2>/dev/null | sha512sum | egrep -o '^.{32}')
hdate=$(date '+%d/%m/%Y')
cdate=$(date '+%s')
loc=$(cat $locf)
baseurl=$(cat $baseurlf)
url="$baseurl/$id?l=$loc&t=$cdate"
day=$(date '+%Y/%m/%Y/%d')
mkdir -p $db/$(dirname $day)
echo $url >> $db/$day
no=$(wc -l < $db/$day)

# scratch dir
dir=$(mktemp -d)

# template
echo '\documentclass{article}
\usepackage{color}
\usepackage{pst-barcode}
\usepackage{auto-pst-pdf}
\usepackage[top=0cm, right=1cm]{geometry}
\begin{document}
\pagestyle{empty}
\raggedleft
\begin{pspicture}(2in,2in)
  \psbarcode[linecolor=gray]{'"$url"'}{eclevel=M width=0.68 height=0.68}{qrcode}
\end{pspicture} \\
'"$hdate"' \\
\vspace{-3mm} \Huge '"$no'"'\hspace{4mm}
\end{document}' > $dir/page.tex

# render & print
(   cd $dir; 
    pdflatex --shell-escape page.tex
    pdftops page.pdf
    lp -o sides=one-sided -d lp45b page.ps
#    okular page.pdf
)
rm -r $dir