#!/bin/bash

url='https://hooks.slack.com/services/xxxxxxxx/xxxxxxx/xxxxxxxxxxxx'
username='Zabbix'

to="$1"
subject="$2"
message="$3"

recoversub='^RECOVER(Y|ED)?$|^OK$|^Resolved.*'
problemsub='^PROBLEM.*|^Problem.*'

if [[ "$subject" =~ $recoversub ]]; then
    emoji=':white_check_mark:'
    color='#00ff40'
elif [[ "$subject" =~ $problemsub ]]; then
    emoji=':exclamation:'
    color='#ff0a0a'
else
    emoji=':question:'
    color='#0ac2ff'
fi

payload="payload={\"channel\": \"${to}\", \"username\": \"${username}\", \"attachments\": [{\"fallback\": \"${subject}\", \"title\": \"${subject}\", \"text\": \"${message}\", \"color\": \"${color}\"}], \"icon_emoji\": \"${emoji}\"}"

return=$(curl -s -m 5 --data-urlencode "${payload}" "$url")

if [[ "$return" != 'ok' ]]; then
    >&2 echo "$return"
    exit 1
fi