#!/bin/bash 
# GNU AGPLv3+
# Nagios plugin to check Gitea version

function usage()
{
 echo "Usage : $0"
}


function getCurrentVersion
{
    local result

    local json=$(curl -s -X GET "https://forge.chalec.org/api/v1/version" -H  "accept: application/json")
    #echo "[$json]"
    
    # {"version":"1.11.1"}
    local regexp='\{"version":"(.*)"}'
    if [[ $json =~ $regexp ]]; then
        result=${BASH_REMATCH[1]}
    else
        result=
    fi

    echo "$result"
}   

function getLastVersionFromGithub
{
    local result
    
    local owner="$1"
    local repo="$2"

    local json=$(curl -s -X GET https://api.github.com/repos/$owner/$repo/releases/latest |grep tag_name)
    #echo "[$json]"

    # [  "tag_name": "v1.11.1",]
    local regexp='.*"tag_name": "v(.+)".*'

    if [[ $json =~ $regexp ]]; then
        result=${BASH_REMATCH[1]}
    else
        result=
    fi
   
    echo "$result"
}


#
if [ "$#" -ne 0 ]; then
    usage
else
    currentVersion=$(getCurrentVersion)
    #echo "Current version = $currentVersion"
    
    lastVersion=$(getLastVersionFromGithub "go-gitea" "gitea")
    #echo "Last version    = $lastVersion"

    if [ $currentVersion = $lastVersion ]; then
        echo "OK"
        result=0
    else
        echo "WARNING : new version available, current is $currentVersion, last is $lastVersion."
        result=1
    fi    
fi
exit $result