#!/bin/bash

weekday='$dow -ge 1 -a $dow -le 5'

while true
do	clear
	echo -e "\t\t\t\t\t\t@ $(date)\n"
	tod=$(date +%k%M,%w)
	dow=${tod#*,}
	tod=${tod%,*}
	stockcheck
	if [ $tod -lt 900 ]		# 00:00-08:59, wait until 09:30
	then	st=$(( (8 - $tod / 100) * 3600 + (60 - $tod % 100) * 60 ))
	elif [ $tod -lt 930 ]		# 09:00-09:29, wait until 9:30
	then	st=$(( (930 - $tod) * 60 ))
	elif eval [ $weekday -a $tod -lt 1600 ]	# 09:30-15:59
	then	# run every 2 mins
		# st=$(( (1 - 1$(date +%M) % 2) * 60 + 160 - 1$(date +%S) ))
		# run every 3 mins
		st=$(( (2 - 3$(date +%M) % 3) * 60 + 160 - 1$(date +%S) ))
		# run every 4 mins
		# st=$(( (3 - 1$(date +%M) % 4) * 60 + 160 - 1$(date +%S) ))
		# run every 5 mins
		# st=$(( (4 - 1$(date +%M) % 5) * 60 + 160 - 1$(date +%S) ))
	elif eval [ $weekday -a $tod -lt 1830 ]	# 16:00-18:29, run every 30 mins
	then	st=1800
	else				# 18:30-23:59, wait until 09:30
		st=$(( (9 + 23 - $tod / 100) * 3600 + (90 - $tod % 100) * 60 ))
	fi
	printf "\n"
	while [ $st -gt 0 ]
	do
		if [ $st -lt 3600 ]
		then	printf "\r\t\t\t\t\t\tnext update in %d:%02d minutes " \
			      $(( $st / 60 )) $(( $st % 60 ))
		else	printf "\r\t\t\t\t\t\tnext update in %d:%02d:%02d " \
		      $(( $st / 3600 )) $(( ($st % 3600) / 60 )) $(( $st % 60 ))
		fi
		sd=0
		if [ $st -gt 30 ]
		then sd=$(( $st / 10 ))
		elif [ $st -gt 3 ]
		then sd=3
		else sd=$st
		fi
		sleep $sd
		st=$(( $st - $sd ))
	done
done