printf "Content-Type: text/plain\n\n"

input=$(cat /dev/stdin)
token=1493641835:AAGR7kLksUIjcrM-PXiVEM_yxLGqLGRWKZA

cmd=($(jq -r '.message.text' <<< $input))
chat=$(jq -r '.message.chat.id' <<< $input)
user=$(jq -r '.message.from.username' <<< $input)

sendmsg(){
	# Escape any special characters first, see https://0x0.st/NO7J.
	fmt=$(sed 's/[][`~!@#$%^&*()-_=+{}\|;:",<.>/?'"'"']/\\&/g' <<< $1 | sed 's/\t//g')
	curl -X POST "https://api.telegram.org/bot$token/sendMessage" \
		-d "chat_id=$chat" -d "parse_mode=markdownv2" -d "text=$fmt"
}

alive(){
	sendmsg "Alive and well!"
}

hiya(){
	sendmsg "Hiya! :3"
}

stat(){
	admin
	total=$(grep MemTotal /proc/meminfo | awk '{print $2}')
	avail=$(grep MemAvailable /proc/meminfo | awk '{print $2}')
	used=$(bc <<< "$total-$avail")
	sendmsg "$(uptime | cut -c2-)
	I am using ${used}K of memory and \
	$(df -h / | tail -n1 | awk '{print $3}') of storage."
}

cv(){
	stats=$(curl -sL corona.lmao.ninja/v2/countries/${cmd[1]})
	country=$(jq -r '.country' <<< $stats)
	cases=$(jq -r '.todayCases' <<< $stats)
	sendmsg "Today's COVID-19 cases for $country: $cases. Stay safe!"
}

id(){
	sendmsg "Chat ID: $chat"
}

fail(){
	sendmsg "Sorry, you are not allowed to use this command!"
	exit 1
}

admin(){
	case $user in
		ghnou)	continue ;;
		*)	fail ;;
	esac
}

case "$cmd" in
	/alive*)	alive ;;
	/stat*)		stat ;;
	/cv*|/corona*)	cv ;;
	/id*)		id ;;
	@konatasanbot*)	hiya ;;
esac