#!/bin/sh
# require: grep, sed, curl
UA="Opera/9.80 (Android; Opera Mini/12.0.1987/37.7327; U; pl) Presto/2.12.423 Version/12.16"
ENC="UTF-8"

SL=$(echo $1|awk -F= '{print $1}')
TL=$(echo $1|awk -F= '{print $2}')

RETRY_NUMBER=0
while true
do
	res=$(curl -G -s https://translate.google.com/m \
	 -d "hl=en" \
	 -d "sl=$SL" \
	 -d "tl=$TL" \
	 -d "ie=$ENC" \
	 -d "prev=_m" \
	 --data-urlencode "q=$2" \
	 -A "$UA")

	if ! echo "$res"|grep -F '<title>Error 502' >/dev/null
	then
		echo "$res"|grep '"result-container"'|sed 's/.*class="result-container">\([^<]*\)<.*/\1/'
		exit 0
	fi

	RETRY_NUMBER=$(( $RETRY_NUMBER + 1 ))

	if [ $RETRY_NUMBER -gt 5 ]
	then
		echo 'Failure' >/dev/stderr
		exit 1
	fi

	echo $(( 2 ** $RETRY_NUMBER ))
	sleep $(( 2 ** $RETRY_NUMBER ))
done