#!/usr/bin/env bash
scriptdir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
iid="$(basename "$scriptdir")"
tmptex="$(mktemp).tex"

function commanum {
	num="$1"
	whole="$(echo "$num" | cut -d'.' -f1)"
	decimal="$(echo "$num" | cut -d'.' -f2)"
	comma=`echo "$whole" | sed -e :a -e 's/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta'`
	echo "$comma.$decimal"
}


cd "$scriptdir"
inv="$(cat invoice.tex)"
echo "$inv" \
	| sed "s/%iid%/$iid/g" > "$tmptex"
inv="$(cat "$tmptex")"

itotal=0
while read -r line
do
	if [[ "$line" == "" ]]
	then
		continue
	fi
	
	itemdate="$(echo "$line" | awk -F'\t' '{print $1}')"
	itemdesc="$(echo "$line" | awk -F'\t' '{print $2}')"
	itemqty="$(echo "$line" | awk -F'\t' '{print $3}')"
	itemunit="$(echo "$line" | awk -F'\t' '{print $4}')"
	itemprice="$(echo "$line" | awk -F'\t' '{print $5}')"
	itemtotal="$(echo "scale=2; $itemqty * $itemprice" | bc -l)"
	
	itempricecomma="$(commanum "$itemprice")"
	itemtotalcomma="$(commanum "$itemtotal")"
	
	itemunitsingular="$(echo "$itemunit" | cut -d'/' -f1)"
	itemunitplural="$(echo "$itemunit" | cut -d'/' -f2)"
	
	itemunit="$itemunitplural"
	if [[ "$itemqty" == "1" ]]
	then
		itemunit="$itemunitsingular"
	fi
	
	texitem="{{\\\it %itemdate%, %itemdesc%\\\\\\\(%itemqty% %itemunit% $\\\times$ \\\\$%itemprice%/%itemunitsingular%)\\\dotfill \\\\$%itemtotal%}}"
	texitem="$(echo "$texitem" | sed "s/%itemdate%/$itemdate/g")"
	texitem="$(echo "$texitem" | sed "s/%itemdesc%/$itemdesc/g")"
	texitem="$(echo "$texitem" | sed "s/%itemqty%/$itemqty/g")"
	texitem="$(echo "$texitem" | sed "s/%itemprice%/$itempricecomma/g")"
	texitem="$(echo "$texitem" | sed "s/%itemtotal%/$itemtotalcomma/g")"
	texitem="$(echo "$texitem" | sed "s/%itemunit%/$itemunit/g")"
	texitem="$(echo "$texitem" | sed "s/%itemunitsingular%/$itemunitsingular/g")"
	texitem="$texitem\\"$'\n'"\\"$'\n'"%iitems%" # newlines parsed with sed
	
	inv="$(echo "$inv" | sed "s#%iitems%#$texitem%#")"
	
	itotal="$(echo "scale=2; $itotal + $itemtotal" | bc -l)"
	
done < items.txt

itotalcomma="$(commanum "$itotal")"

echo "$inv" \
	| sed "s/%itotal%/$itotalcomma/g" > "$tmptex"
inv="$(cat "$tmptex")"

pdflatex -output-directory="$scriptdir" -jobname="$iid" "$tmptex"
latexmk -c

rm *.aux *.log *.out
cd -