#!/bin/sh

# DEFAULT OPTIONS
INSTANCE="https://translate.bus-hit.me"
ENGINE="google"
FLANG="auto"
TLANG="en"

BN="${0##*/}"

errecho() {
	>&2 echo "$@"
}

fail() {
	errecho "error: $BN: $*"
	exit 1
}

usage() {
	errecho \
"usage: $BN [-h] [-i INSTANCE] [-e ENGINE] [-f LANG] [-t LANG] TEXT
translate text using simplytranslate

 -h            show this help
 -i <INSTANCE> choose simplytranslate instance
               default: \"$INSTANCE\"
 -e <ENGINE>   use ENGINE to translate
               default: \"$ENGINE\"
 -f <LANG>     translate from LANG
               default: \"$FLANG\"
 -t <LANG>     translate to LANG
               default: \"$TLANG\""
	exit 0
}

# Read options
while getopts :hi:f:t: OPT; do
	case "$OPT" in
		h) usage ;;
		i) INSTANCE="$OPTARG" ;;
		e) ENGINE="$OPTARG" ;;
		f) FLANG="$OPTARG" ;;
		t) TLANG="$OPTARG" ;;
		*) fail "unknown option: -$OPTARG. run $BN -h to see all options" ;;
	esac
done
shift $((OPTIND - 1))

[ -n "$*" ] || set -- "$(cat /dev/stdin)"
[ -n "$*" ] || usage

curl -s "${INSTANCE}/api/translate?engine=${ENGINE}&from=${FLANG}&to=${TLANG}&text=$(jq -rn --arg x "$*" '$x|@uri')" | jq -r '."translated-text"'