#!/usr/bin/env bash

# Actual script directory path
DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"

DATE=$1

if [ "$DATE" = "" ]; then
    YEAR=$(date +%Y)
    MONTH=$(date +%m)
    LAST_MONTH=$(expr $MONTH - 1)
    DATE=$(echo $YEAR-$MONTH)
fi

CHATS=$(cat $DIR/../output.log | grep -e "${DATE}" | grep -e "New join detected" | grep -o -P '(?<= \[-).*(?=] )' | sort -u)

NUM_ACTIVE_GROUPS=$(echo "$CHATS" | sort -u | wc -l)

echo ""
echo "Active Groups:"
echo "$CHATS"
echo ""
echo "Active Groups in last and current months: $NUM_ACTIVE_GROUPS"
echo ""

exit 0