#!/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"
        echo "plays.label plays"
        echo "plays.info Active plays on jellyfin"
        echo "plays.min 0"
        echo "transcodes.label transcodes"
        echo "transcodes.info Active transcodes on jellyfin"
        echo "transcodes.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"); then
	echo "sessions.value $(echo "$active_sessions" | jq -r '. | length')"
	echo "plays.value $(echo "$active_sessions" | grep -o '"PlayMethod":' | wc -l)"

	echo "transcodes.value $(echo "$active_sessions" | grep -o '"PlayMethod":"Transcode"' | wc -l)"
else
	echo "sessions.value U"
	echo "plays.value U"
	echo "transcodes.value U"
fi