#!/bin/bash

################
### LOG MAIL ###
################

env > /tmp/env_login.txt

USERIP=$(echo ${SSH_CONNECTION%% *})

# On ne check la géo que si l'IP n'est pas locale (RFC1918)
if [[ $USERIP =~ ^192\.168\. || $USERIP =~ ^10\. || $USERIP =~ ^172\. ]]; then
    LOC_INFO="Local Network (LAN)"
else
    # On récupère tout en un seul appel JSON pour économiser l'API et éviter les erreurs
    GEO=$(curl -s ipinfo.io/$USERIP/json)
    CITY=$(echo "$GEO" | grep '"city"' | cut -d'"' -f4)
    COUNTRY=$(echo "$GEO" | grep '"country"' | cut -d'"' -f4)
    ORG=$(echo "$GEO" | grep '"org"' | cut -d'"' -f4)
    LOC_INFO="$CITY, $COUNTRY (ISP: $ORG)"
fi


# Détection du backend mail (une seule fois)
if command -v mail >/dev/null 2>&1; then
    MAIL_BACKEND="mail"

elif command -v sendmail >/dev/null 2>&1; then
    MAIL_BACKEND="sendmail"

elif command -v msmtp >/dev/null 2>&1; then
    MAIL_BACKEND="msmtp"

else
    echo "ERROR: No mail system available" >&2
    MAIL_BACKEND="none"
fi


send_mail() {
    local to="$1"
    local subject="$2"
    local body="$3"

    case "$MAIL_BACKEND" in
        mail)
            echo "$body" | mail -v -s "$subject" "$to"
            ;;

        sendmail)
            {
                echo "To: $to"
                echo "Subject: $subject"
                echo ""
                echo "$body"
            } | sendmail -t
            ;;

        msmtp)
            {
                echo "To: $to"
                echo "Subject: $subject"
                echo ""
                echo "$body"
            } | msmtp "$to"
            ;;

        *)
            echo "No mail backend available" >&2
            return 1
            ;;
    esac
}


SUBJECT="[INFO] $USER connected on $FULLNAME"
BODY="$USER connected on $FULLNAME from $USERIP - $LOC_INFO"

send_mail "$ADMIN_MAIL" "$SUBJECT" "$BODY"