#! /usr/bin/env bash

# all executed commands are printed to stdout
set -x

# redirect stdout (and stderr to stdout) to a file
exec 1> /var/log/updater/gitea-updater/gitea-$(date +%F).log 2>&1

# abort on nonzero exitstatus
set -o errexit

# abort on unbound variable
set -o nounset

# don't hide errors within pipes
set -o pipefail

# set your API key here
key=

# set your chat id here
chat_id=

function send_message() {
	if [ $# -eq 0 ]
	then
		echo "No argument supplied. Please specify the message to send."
	else
		curl --silent --show-error --fail --request POST https://api.telegram.org/${key}/sendMessage --data chat_id=${chat_id} --data text="${1}" --output /dev/null
	fi
}

function update_gitea() {
	systemctl stop gitea.service

	# download the latest version
	curl --location --output /usr/local/bin/gitea --silent --show-error --fail https://dl.gitea.io/gitea/${1}/gitea-${1}-linux-amd64

	# set the correct permissions
	chmod +x /usr/local/bin/gitea
	/usr/sbin/restorecon /usr/local/bin/gitea
	/usr/sbin/restorecon /var/lib/gitea/log/gitea.log

	if systemctl start gitea.service
	then
		send_message "[Gitea] - Gitea has just been updated."
	else
		send_message "[Gitea] - Gitea service did not start correctly. Please log in as soon as possible and see what went wrong."
	fi
}

# retrieve local release
local_release=$(/usr/local/bin/gitea --version | awk '{print $3}')

# retrieve the latest release
latest_release=$(curl -sSf "https://api.github.com/repos/go-gitea/gitea/releases/latest" | grep '"tag_name":' | sed --regexp-extended 's/.*"([^"]+)".*/\1/' | cut --characters=2-)

# compare these two versions
if [ ${latest_release} == ${local_release} ]
then
	send_message "[Gitea] - Gitea is up to date."
else
	send_message "[Gitea] - Gitea is not up to date (https://github.com/go-gitea/gitea/releases/tag/v${latest_release})."
	update_gitea ${latest_release}
fi