#!/bin/bash

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

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

#=================================================
# LOAD SETTINGS
#=================================================

export app=$YNH_APP_INSTANCE_NAME

export repository="$(ynh_app_setting_get $app repository)"
export server="$(ynh_app_setting_get $app server)"
export ssh_user="$(ynh_app_setting_get $app ssh_user)"
export passphrase="$(ynh_app_setting_get $app passphrase)"
export on_calendar="$(ynh_app_setting_get $app on_calendar)"
export conf="$(ynh_app_setting_get $app conf)"
export data="$(ynh_app_setting_get $app data)"
export apps="$(ynh_app_setting_get $app apps)"
export mailalert="$(ynh_app_setting_get $app mailalert)"
if [[ $mailalert != "always" && $mailalert != "errors_only" && $mailalert != "never" ]]; then
	ynh_app_setting_set --app=$app --key="mailalert" --value="errors_only"
	export mailalert="errors_only"
fi
ynh_app_setting_set --app=$app --key="state" --value="not run since last update"
ynh_app_setting_set --app=$app --key="last_run" --value="-"

#=================================================
# CHECK IF AN UPGRADE IS NEEDED
#=================================================
ynh_check_app_version_changed

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

# 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

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

if [ -z "$repository" ]; then
    repository="ssh://$ssh_user@$server/~/backup"
    server=$(echo "$repository" | cut -d"@" -f2 | cut -d"/" -f1)
    if [[ $server == *":"* ]]; then
        server="[$(echo "$server" | cut -d":" -f1)]:$(echo "$server" | cut -d":" -f2)"
    fi
    ynh_app_setting_set $app repository "$repository"
    ynh_app_setting_set $app server "$server"
    ynh_app_setting_delete $app ssh_user
fi

if grep "borg.timer" /etc/yunohost/services.yml > /dev/null ; then
    yunohost service remove $app.timer
    systemctl enable $app.timer --quiet
    systemctl start $app.timer
fi

# Replace backports with pip
[ ! -e " /etc/apt/sources.list.d/$app-stretch-backports.list" ] || rm -f /etc/apt/sources.list.d/$app-stretch-backports.list

# Reinstall borg if debian change of major version
if [ ! -f "/opt/borg-env/$(ynh_get_debian_release)" ] ; then
    ynh_secure_remove /opt/borg-env
fi

#=================================================
# UPGRADE DEPENDENCIES
#=================================================
ynh_script_progression --message="Upgrading dependencies..." --weight=1

ynh_install_app_dependencies $pkg_dependencies

#=================================================
# CREATE DEDICATED USER
#=================================================
ynh_script_progression --message="Configuring system user..." --weight=1

# Create a system user
ynh_system_user_create --username=$app


#=================================================
# SPECIFIC UPGRADE
#=================================================
# Upgrade borgbackup
#=================================================
ynh_script_progression --message="Upgrading borgbackup..." --weight=1

install_borg_with_pip

#=================================================
# SETUP THE BACKUP METHOD
#=================================================
ynh_script_progression --message="Setting up backup method..." --weight=1
ynh_add_config --template="backup_method" --destination="/etc/yunohost/hooks.d/backup_method/05-${app}_app"
chmod go=--- "/etc/yunohost/hooks.d/backup_method/05-${app}_app"

ynh_add_config --template="backup-with-borg" --destination="/usr/local/bin/backup-with-$app"
chmod u+x "/usr/local/bin/backup-with-$app"
chown $app:$app "/usr/local/bin/backup-with-$app"

ynh_add_config --template="sudoer" --destination="/etc/sudoers.d/$app"
chown root:root "/etc/sudoers.d/$app"

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

# Create a dedicated systemd config
ynh_add_systemd_config
# Disable the service, this is to prevent the service from being triggered at boot time
systemctl disable $app.service --quiet

#=================================================
# CONFIGURE SYSTEMD TIMER
#=================================================
ynh_add_config --template="systemd.timer" --destination="/etc/systemd/system/$app.timer"
systemctl enable $app.timer --quiet
systemctl start $app.timer

mkdir -p /etc/yunohost/hooks.d/backup
mkdir -p /var/log/${app}
chown -R $app:$app /var/log/${app}
chmod u+w /var/log/${app}

#=================================================
# GENERIC FINALIZATION
#=================================================

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

# Inactive services are ignored cause it's a timer
yunohost service add $app --description="Deduplicating backup program" --test_status="systemctl show $app.service  -p ActiveState --value | grep -v failed"


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

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