#!/bin/bash

me="$(basename $0)"

textToDate ()
{
	if [ ! "$(grep -P "(\d\d\.?){3}" <<< "$1")" ]
	then
		d=$(sed 's/^\(next\|n\)$/tomorrow/' <<< "$1")
		date --date="$d" +"%Y-%m-%d" || exit 1
	else
		echo "$1";
	fi
}

if [ "$1" = "usage" ]
then
	echo "    hw"
	echo "      list homework"
	echo "    hw add"
	echo "      prompt for adding an assignment"
	echo "    hw [due date] [class] [description]"
	echo "      add an assignment without a prompt"
	echo "    hw [date]"
	echo "      list assignments due on [date]"
	echo "    hw rel"
	echo "      list assignments with the dates in days relative to today"
	exit 0
fi
shift
	
if [ "$1" = "add" ]
then
	read -p "Due: " due
	due="$(textToDate "$date")"
	read -p "Class: " class
	read -p "Description: " desc
	"$TODO_FULL_SH" add "(B) +hw" "class:$class $due $desc"
elif [ "$1" = "rel" ]
then
	"$TODO_FULL_SH" "$me" | sed -e "s/.*/echo \'&\'/g;s/due:\([0-9-]*\)/due:\'"'$(( ($(date --date="\1" +%s) - $(date --date="00:00" +%s)) \/ 86400 ))'"\'d/ge"
elif [ -n "$1" -a -n "$2" -a -n "$3" ]
then
	due="due:$(textToDate "$1")" || { echo "invalid date" ; exit 1; }
	shift
	class="class:$1"
	shift
	"$TODO_FULL_SH" add "(B) +hw $due $class $@"
else
	IFS=$'\n'
	today=$(textToDate "today" | tr -d '-')
	if [ -n "$1" ]
	then
		inDate="$(textToDate "$1" | tr -d '-' | cut -f1)"
	fi
	x=0
	for i in $("$TODO_FULL_SH" list | grep "+hw")
	do
		x=$(($x+1))
		date=$(grep -oP "due:\K[0-9-]*" <<< "$i"| tr -d '-' | cut -f1)
		if [ "$date" -le "$today" ]
		then
			echo "$i" | sed "s/\(due:[0-9-]*\)/$(tput bold)\1$(tput sgr0)/g"
		elif [ -n "$inDate" ]
		then
			if [ "$date" -eq "$inDate" ]
			then
				echo "$i"
			fi
		else
			echo "$i"
		fi
	done
fi