#!/usr/bin/env bash

usage() {
  echo "Usage: $(basename $0) offset"
}

if [ ! $# -eq 1 ]; then
    usage
    exit 1
fi

OFFSET=$1

if [ -z $TELEGRAM_BOT_TOKEN ]; then
  echo "TELEGRAM_BOT_TOKEN must be set with OpenAI authorization bearer token (without Bearer prefix)"
  exit 1
fi

TIMEOUT=5

while true
do
    echo "Long polling for telegram updates with offset $OFFSET ..."
    R=$(curl --silent "https://api.telegram.org/bot$TELEGRAM_BOT_TOKEN/getUpdates?timeout=$TIMEOUT&offset=$OFFSET")
    echo "$R" | jq
    update_id="$(echo "$R" | jq -e '.result[0].update_id')"
    if [ ! $? -eq 0 ]; then
        echo "Timeout"
        continue
    fi
    text=$(echo "$R" | jq -e '.result[0].message.text')
    if [ $? -eq 0 ]; then
        text=$(echo "$text" | sed -e 's/^"//' -e 's/"$//')
        if [[ $text = /prompt* ]]; then
            prompt="${text:8}"
            chat_id="$(echo "$R" | jq -e '.result[0].message.chat.id')"
            echo "Received prompt "$prompt" in chat $chat_id"
            # TODO: send prompt to OpenAI and stream response back to chat
        fi
    fi
    OFFSET=$(( update_id + 1))
done