#!/bin/bash

# Configuration
# You need an API key. You can get it for free from https://www.deepl.com/pro-api
key=""
usage="usage: $0 [-h] [-l] target language [-t] text"
lang="IT" # Target language (EN, FR, ES, RU...)

# API request
request () {
    response=$(curl -s https://api-free.deepl.com/v2/translate -d auth_key="$key" -d "text=$2" -d "target_lang=$1")
    echo $response
}

# Main
while getopts ":hl:t:" option; do
    case $option in
        h) 
            echo $usage; 
            exit
            ;;
        l) 
            lang=${OPTARG^^} # Uppercase 
            ;; 
        t)
            text=${OPTARG} # Text to translate 
            ;;
        \?) 
            echo "error: option -$OPTARG is not implemented"; 
            exit 
            ;;
    esac
done

# Get stdin
if [ -z "$text" ] && [ -p /dev/stdin ]; then
    text=$(cat /dev/stdin)
fi

if [ -z "$text" ]; then
    echo "error: text not provided or empty"
    echo $usage
    exit
fi

if [ -z "$key" ]; then
    echo "error: you need an API key. You can get it for free from https://www.deepl.com/pro-api"
    echo $usage
    exit
fi

response=$(request $lang "$text")
# You can use jq, alternatively
echo $response | cut -d: -f4 | cut -d'"' -f2