#!/bin/sh
if  [ -z "$MATRIX_PROVIDER" ] || 
    [ -z "$MATRIX_ACCESS_TOKEN" ] || 
    [ -z "$MATRIX_ROOM_ID" ] || 
    [ -z "$SERVER_ADDRESS" ]
then
    echo 'env vars $MATRIX_PROVIDER/$MATRIX_ACCESS_TOKEN/$MATRIX_ROOM_ID/$SERVER_ADDRESS not set'
    exit -1
fi

provider="$MATRIX_PROVIDER"
token="$MATRIX_ACCESS_TOKEN"
room="$MATRIX_ROOM_ID"
server="$SERVER_ADDRESS"

status=false

while true
do 
    update="$(curl -s https://api.mcstatus.io/v2/status/java/$server | jq -r '.players | "Online: \(.online) (\(.list | map(.name_clean) | sort | join(", ")))"')"
    if [ "$update" != "$status" ]
    then 
        status="$update"
        curl -X PUT -d "{\"topic\": \"$update\"}" \
            "$provider/_matrix/client/r0/rooms/$room/state/m.room.topic?access_token=$token"
        echo ""
    fi
    sleep 300
done