#!/bin/bash

if [ -f $HOME/.dmenurc ]
then
	source $HOME/.dmenurc
else
	DMENU='dmenu -i'
fi

TERMINAL=st

if [ -e ~/.when/preferences ]
then
	calendar="$(head -n 1 ~/.when/preferences | awk '{print $3}' )"
else
	$TERMINAL -e when
	exit
fi

options="--noheader --wrap=0 --noampm" # the first two are important, please don't remove them

choice=$(echo -e "show\nadd\nspecial\nedit" | $DMENU -p 'choose an action:')
case $choice in
	show)
		wmy=$(echo -e "week\nmonth\nyear" | $DMENU -p 'show events of coming')
		case $wmy in
			week)
				when $options w | $DMENU -p 'events of coming week:'
				;;
			month)
				when $options m | $DMENU -p 'events of coming month:'
				;;
			year)
				when $options y | $DMENU -p 'events of coming year'
				;;
		esac
		;;
	add)
		year=$(date +%Y | $DMENU -p 'year:')
		if [ ! "$year" ];then exit;fi
		month=$(echo -e "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug\nSep\nOct\nNov\nDec" | $DMENU -p 'month:')
		if [ ! "$month" ];then exit;fi
		case $month in
			Jan|Mar|May|Jul|Aug|Oct|Dec)
				day=$(echo {01..31} | sed 's/\ /\n/g' | $DMENU -p 'month:')
				;;
			Feb)
				if [ $[$year % 400] -eq "0" ]
				then
					day=$(echo {01..29} | sed 's/\ /\n/g' | $DMENU -p 'month:')
				elif [ $[$year % 4] -eq 0 ]
				then
					if [ $[$year % 100] -ne 0 ]
					then
						day=$(echo {01..29} | sed 's/\ /\n/g' | $DMENU -p 'month:')
					else
						day=$(echo {01..28} | sed 's/\ /\n/g' | $DMENU -p 'month:')
					fi
				else day=$(echo {01..28} | sed 's/\ /\n/g' | $DMENU -p 'month:')
				fi
				;;
			Apr|Jun|Sep|Nov)
				day=$(echo {01..30} | sed 's/\ /\n/g' | $DMENU -p 'month:')
				;;
		esac
		if [ ! "$day" ];then exit;fi
		time=$(date +%H:%M | $DMENU -p 'time (can be left blank):')
		event=$(xsel -o | $DMENU -p 'event:')
		if [ ! "$event" ];then exit;fi
		echo "$year $month $day , $time $event" >> $calendar
		;;
	special)
		specialcase=$(echo -e "birthday\nyearly\nmonthly\nweekly\ncustom" | $DMENU -p 'choose a special case:')
		case $specialcase in
			birthday)
				who="$(xsel -o | $DMENU -p 'who is the birthday kid?')"
				if [ ! "$who" ];then exit;fi
				year=$(xsel -o | $DMENU -p "what year was $who born?")
				if [ ! "$year" ];then exit;fi
				month=$(echo -e "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug\nSep\nOct\nNov\nDec" | $DMENU -p "what month was $who born?")
				if [ ! "$month" ];then exit;fi
				case $month in
					Jan|Mar|May|Jul|Aug|Oct|Dec)
						day=$(echo {01..31} | sed 's/\ /\n/g' | $DMENU -p 'month:')
						;;
					Feb)
						if [ $[$year % 400] -eq "0" ]
						then
							day=$(echo {01..29} | sed 's/\ /\n/g' | $DMENU -p 'month:')
						elif [ $[$year % 4] -eq 0 ]
						then
							if [ $[$year % 100] -ne 0 ]
							then
								day=$(echo {01..29} | sed 's/\ /\n/g' | $DMENU -p 'month:')
							else
								day=$(echo {01..28} | sed 's/\ /\n/g' | $DMENU -p 'month:')
							fi
						else day=$(echo {01..28} | sed 's/\ /\n/g' | $DMENU -p 'month:')
						fi
						;;
					Apr|Jun|Sep|Nov)
						day=$(echo {01..30} | sed 's/\ /\n/g' | $DMENU -p 'month:')
						;;
				esac
				echo "${year}* $month $day , BIRTHDAY: ${who}s \a. birthday (\y)" >> $calendar
				;;
			yearly)
				month=$(echo -e "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug\nSep\nOct\nNov\nDec" | $DMENU -p 'month:')
				if [ ! "$month" ];then exit;fi
				case $month in
					Jan|Mar|May|Jul|Aug|Oct|Dec)
						day=$(echo {01..31} | sed 's/\ /\n/g' | $DMENU -p 'month:')
						;;
					Feb)
						if [ $[$year % 400] -eq "0" ]
						then
							day=$(echo {01..29} | sed 's/\ /\n/g' | $DMENU -p 'month:')
						elif [ $[$year % 4] -eq 0 ]
						then
							if [ $[$year % 100] -ne 0 ]
							then
								day=$(echo {01..29} | sed 's/\ /\n/g' | $DMENU -p 'month:')
							else
								day=$(echo {01..28} | sed 's/\ /\n/g' | $DMENU -p 'month:')
							fi
						else day=$(echo {01..28} | sed 's/\ /\n/g' | $DMENU -p 'month:')
						fi
						;;
					Apr|Jun|Sep|Nov)
						day=$(echo {01..30} | sed 's/\ /\n/g' | $DMENU -p 'month:')
						;;
				esac
				if [ ! "$day" ];then exit;fi
				time=$(date +%H:%M | $DMENU -p 'time (can be left blank):')
				event=$(xsel -o | $DMENU -p 'event:')
				if [ ! "$event" ];then exit;fi
				echo "m=$month & d=$day , $time $event" >> $calendar
				;;
			monthly)
				day=$(echo {01..31} | sed 's/\ /\n/g' | $DMENU -p 'day of the month:')
				if [ ! "$day" ];then exit;fi
				time=$(date +%H:%M | $DMENU -p 'time (can be left blank):')
				event=$(xsel -o | $DMENU -p 'event:')
				if [ ! "$event" ];then exit;fi
				echo "d=$day , $time $event" >> $calendar
				;;
			weekly)
				day=$(echo -e "Mon\nTue\nWed\nThu\nFri\nSat\nSun" | $DMENU -p 'weekday:')
				if [ ! "$day" ];then exit;fi
				time=$(date +%H:%M | $DMENU -p 'time (can be left blank):')
				event=$(xsel -o | $DMENU -p 'event:')
				if [ ! "$event" ];then exit;fi
				echo "w=$day , $time $event" >> $calendar
				;;
			custom)
				fancycustominput="$(xsel -o | $DMENU -p 'fancy custom input:')"
				if [ ! "$fancycustominput" ];then exit;fi
				echo "$fancycustominput" >> $calendar
		esac
		;;
	edit)
		$TERMINAL -e when e
esac