#!/bin/bash

#=================================================
# GENERIC START
#=================================================
# IMPORT GENERIC HELPERS
#=================================================

source _common.sh
source /usr/share/yunohost/helpers

#=================================================
# LOAD SETTINGS
#=================================================
ynh_script_progression --message="Loading installation settings..." --weight=1

app=$YNH_APP_INSTANCE_NAME

domain=$(ynh_app_setting_get --app=$app --key=domain)
path_url=$(ynh_app_setting_get --app=$app --key=path)
port=$(ynh_app_setting_get --app=$app --key=port)
port_wg=$(ynh_app_setting_get --app=$app --key=port_wg)
final_path=$(ynh_app_setting_get --app=$app --key=final_path)

#=================================================
# CHECK VERSION
#=================================================

### This helper will compare the version of the currently installed app and the version of the upstream package.
### $upgrade_type can have 2 different values
### - UPGRADE_APP if the upstream app version has changed
### - UPGRADE_PACKAGE if only the YunoHost package has changed
### ynh_check_app_version_changed will stop the upgrade if the app is up to date.
### UPGRADE_APP should be used to upgrade the core app only if there's an upgrade to do.
upgrade_type=$(ynh_check_app_version_changed)

#=================================================
# ENSURE DOWNWARD COMPATIBILITY
#=================================================
ynh_script_progression --message="Ensuring downward compatibility..." --weight=1

# If final_path doesn't exist, create it
if [ -z "$final_path" ]; then
	final_path=/opt/yunohost/$app
	ynh_app_setting_set --app=$app --key=final_path --value=$final_path
fi

# Change port for WireGuard UI because 8095 is default port for WireGuard VPN
if [ $port -eq 8095 ]
then
	ynh_app_setting_delete --app=$app --key=port
	port=$(ynh_find_port --port=8096)
	ynh_app_setting_set --app=$app --key=port --value=$port
	ynh_app_setting_set --app=$app --key=is_public --value=0
fi

# Downgrade linux-image-$arch if updated to the buster-backports version
arch=$(ynh_detect_arch)
linuximage_version=$(ynh_package_version --package=linux-image-$arch)
if [[ $linuximage_version == *"bpo10"* ]]
then
	# Downgrading using ynh_package_install apt command without "--no-remove" and with "--allow-downgrades"
	# It will remove wireguard-ynh-deps and wireguard but they will be reinstalled throught upgrade process
	ynh_apt --allow-downgrades --option Dpkg::Options::=--force-confdef \
        --option Dpkg::Options::=--force-confold install linux-image-$arch/stable

	#Remove backports kernel if running on it and send a mail to the admin to ask him to reboot
	linuxkernel_version = $(uname -r)
	if [[ $linuxkernel_version == *"bpo"* ]]
	then
		ynh_package_remove "linux-image-$linuxkernel_version"

		echo "You've been using an experimental version of wireguard_ynh, which was using the backports version of the linux kernel.
Now wireguard_ynh use a DKMS module allowing itself to be used with the stable kernel, then the backports one was removed and a reboot is needed to go back to the stable one." > mail_to_send

		ynh_send_readme_to_admin --app_message="mail_to_send" --recipients="admin" --type=upgrade
	fi
fi

#=================================================
# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
#=================================================
ynh_script_progression --message="Backing up the app before upgrading (may take a while)..." --weight=1

# Backup the current version of the app
ynh_backup_before_upgrade
ynh_clean_setup () {
	# restore it if the upgrade fails
	ynh_restore_upgradebackup
}
# Exit if an error occurs during the execution of the script
ynh_abort_if_errors

#=================================================
# STANDARD UPGRADE STEPS
#=================================================
# STOP SYSTEMD SERVICE
#=================================================
ynh_script_progression --message="Stopping a systemd service..." --weight=1

ynh_systemd_action --service_name=wireguard_ui --action="stop" --log_path="/var/log/$app/ui.log"
systemctl disable --now --quiet wireguard.path
ynh_systemd_action --service_name=wireguard --action="stop"

#=================================================
# DOWNLOAD, CHECK AND UNPACK SOURCE
#=================================================

if [ "$upgrade_type" == "UPGRADE_APP" ]
then
	ynh_script_progression --message="Upgrading source files..." --weight=1

	# Download, check integrity, uncompress and patch the source from app.src
	ynh_setup_source --dest_dir="$final_path" --source_id="$(ynh_detect_arch)"
fi

#=================================================
# NGINX CONFIGURATION
#=================================================
ynh_script_progression --message="Upgrading nginx web server configuration..." --weight=1

# Create a dedicated nginx config
ynh_add_nginx_config

#=================================================
# UPGRADE DEPENDENCIES
#=================================================
ynh_script_progression --message="Upgrading dependencies..." --weight=7

#TODO: remove buster-backports kernel

#Add buster-backports repo
ynh_add_repo --uri="http://deb.debian.org/debian" --suite="buster-backports" --component="main" --name="$app"

#Add pin-priority for wireguard packages
ynh_pin_repo --package="wireguard*" --pin="origin deb http://deb.debian.org/debian buster-backports main" --priority=995 --name="$app"

# Update the list of package with the new repo
ynh_package_update

ynh_add_app_dependencies --package="$pkg_dependencies"

#Remove buster-backports repo and pin-priority
ynh_remove_extra_repo --name=$app

#=================================================
# CREATE DEDICATED USER
#=================================================
ynh_script_progression --message="Making sure dedicated system user exists..." --weight=1

# Create a dedicated user (if not existing)
ynh_system_user_create --username=$app

#=================================================
# SETUP SYSTEMD
#=================================================
ynh_script_progression --message="Upgrading systemd configuration..." --weight=1

# Create a dedicated systemd config for the web UI
ynh_add_systemd_config --service=wireguard_ui --template=wireguard_ui.service --others_var="port"

# Create a dedicated systemd config for monitoring WireGuard's configuration
cp ../conf/wireguard.path /etc/systemd/system/wireguard.path
systemctl enable --quiet wireguard.path

# Create a dedicated systemd config for restarting WireGuard
ynh_add_systemd_config --service=wireguard --template=wireguard.service --others_var="port_wg"

#=================================================
# CONFIGURING WIREGUARD
#=================================================

# Create db directory for securing it later
mkdir -p $final_path/db/server

# Add interface configuration file
cp ../conf/interfaces.json $final_path/db/server/interfaces.json
ynh_replace_string --match_string="__PORT_WG__" --replace_string="$port_wg" --target_file="$final_path/db/server/interfaces.json"

#=================================================
# GENERIC FINALIZATION
#=================================================
# SECURE FILES AND DIRECTORIES
#=================================================

# Set permissions on app files
chown -R root: $final_path
chown -R $app: $final_path/db
chmod -R 750 $final_path/db

#=================================================
# SETUP LOGROTATE
#=================================================
ynh_script_progression --message="Upgrading logrotate configuration..." --weight=1

# Use logrotate to manage app-specific logfile(s)
ynh_use_logrotate --non-append

#=================================================
# INTEGRATE SERVICE IN YUNOHOST
#=================================================
ynh_script_progression --message="Integrating service in YunoHost..." --weight=1

yunohost service add wireguard --description "WireGuard" --needs_exposed_ports "$port_wg" --test_status "wg show | grep wg0"
yunohost service add wireguard_ui --description "WireGuard UI" --log "/var/log/$app/ui.log"

#=================================================
# START SYSTEMD SERVICE
#=================================================
ynh_script_progression --message="Starting a systemd service..." --weight=1

# Start a systemd service
ynh_systemd_action --service_name=wireguard_ui --action="start" --log_path="/var/log/$app/ui.log"

#=================================================
# RELOAD NGINX
#=================================================
ynh_script_progression --message="Reloading nginx web server..." --weight=1

ynh_systemd_action --service_name=nginx --action=reload

#=================================================
# END OF SCRIPT
#=================================================

ynh_script_progression --message="Upgrade of $app completed" --last