#!/usr/bin/env sh

set -e

: << =cut

=head1 NAME

jellyfin_sessions - Monitor active sessions on a jellyfin media system

=head1 APPLICABLE SYSTEMS

Jellyfin media system

=head1 CONFIGURATION

Requires a api key for the plugin and an installed jq, a command-line json 
processor.

You may specify the URL where to get the statistics.

 url      - URL of jellyfin
 max_time - Timeout curl - defaults to 3 seconds
 interval - Interval in seconds to check
 api_key  - API key from jellyfin

 [jellyfin_sessions]
 env.url http://127.0.0.1:8096
 env.max_time 3
 env.interval 600
 env.api_key <API_KEY>

=head1 AUTHOR

Copyright (C) 2025 Sebastian L. (https://momou.ch)

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=manual
 #%# capabilities=autoconf

=cut

. "$MUNIN_LIBDIR/plugins/plugin.sh"

url=${url:-"http://127.0.0.1:8096"}
url_sessions="$url/Sessions"
max_time=${max_time:-3}
interval=${interval:-600}
api_key=${api_key:-}

case $1 in
	autoconf)
		if [ -x "$(command -v curl)" ]; then
			if [ -x "$(command -v jq)" ]; then
				if [ -z "$api_key" ]; then
					echo "no (api_key not set)" && exit 1
				else
					curl -s -f -m "$max_time" -H "Authorization: MediaBrowser Token=$api_key" -I -X GET "$url_sessions" | grep -iq "Content-Type: application/json" && echo "yes" && exit 0 || echo "no (invalid or empty response from api endpoint ($url_sessions))" && exit 1
				fi
			else
				echo "no (jq not found)" && exit 1
			fi
		else
			echo "no (curl not found)" && exit 0
		fi
	;;

    config)
        echo "graph_title Sessions on Jellyfin"
        echo "graph_category appserver"
        echo "graph_vlabel jellyfin sessions"
        echo "graph_info Currently active sessions on jellyfin"
        echo "graph_args --base 1000 --lower-limit 0"
        echo "sessions.label sessions"
        echo "sessions.info Active sessions on jellyfin"
        echo "sessions.min 0"
        exit 0
    ;;
esac

if active_sessions=$(curl -s -f -m "$max_time" -H "Authorization: MediaBrowser Token=$api_key" -X GET "$url_sessions"?activeWithinSeconds="$interval" | jq '. | length' | grep -E "[0-9]+"); then
	echo "sessions.value $active_sessions"
else
	echo "sessions.value U"
fi