#!/bin/bash

# We don't stop the script on errors cause we want to backup all data we could backuped
#set -eu

borg_id=$1
errors=""
current_date=$(date +"%y%m%d_%H%M")
log_file="/var/log/${borg_id}/${current_date}.log"
err_file="/var/log/${borg_id}/${current_date}.err"
mkdir -p "/var/log/${borg_id}"
if [ -z "$borg_id" ]
then
    echo "This script expects a borg app id as first argument" >&2
    exit 1
fi

filter_hooks() {
    sudo ls /usr/share/yunohost/hooks/backup/ /etc/yunohost/hooks.d/backup/ | grep "\-$1_" | cut -d"-" -f2 | uniq 2>> $err_file
}

fail_if_partially_failed() {
    grep Skipped|Error
}
sudo yunohost app setting ${borg_id} last_run -v "${current_date}"
sudo yunohost app setting ${borg_id} state -v "ongoing"

# Backup system part conf
conf=$(sudo yunohost app setting ${borg_id} conf)
if [[ "$conf" = "1" ]]
then
    if ! sudo yunohost backup create -n auto_conf --method ${borg_id}_app --system $(filter_hooks conf) 2>> $err_file >> $log_file ; then
        errors+="\nThe backup miserably failed to backup system configurations."
    fi
fi

# Backup system data
data=$(sudo yunohost app setting ${borg_id} data)
if [[ "$data" = "1" ]]
then
    if ! sudo yunohost backup create -n auto_data --method ${borg_id}_app --system $(filter_hooks data) 2>> $err_file >> $log_file ; then
        errors+="\nThe backup miserably failed to backup system data."
    fi
fi

# Backup all apps independently
apps=$(sudo yunohost app setting ${borg_id} apps | tr -d ' ')
for application in $(sudo ls /etc/yunohost/apps/); do
    
    if ( [[ "$apps" =~ ^exclude: ]] && grep -wq "$application" <<< "$apps" ) ||
       ( [[ "$apps" != "all" ]] && [[ ! "$apps" =~ ^exclude: ]]  && ! grep -wq "$application" <<< "$apps" ); 
    then
        continue
    fi
    
    if sudo test ! -f /etc/yunohost/apps/$application/scripts/backup ; then
        errors+="\nWarning: The application $application has no backup script. This app won't be backuped."
        continue
    fi

    if ! sudo yunohost backup create -n auto_$application --method ${borg_id}_app --apps $application 2>> $err_file >> $log_file ; then
        errors+="\nThe backup miserably failed to backup $application application."
    fi
done

#=========================================================
# SEND MAIL TO NOTIFY SUCCED OR FAILED OPERATIONS
#=========================================================

partial_errors="$(cat $log_file | grep -E "Error|Skipped")"
if [ ! -z "$partial_errors" ]; then
    errors+="\nSome backup partially failed:\n$partial_errors"
fi

# Send mail on backup (partially) failed
domain=$(hostname)
repository="$(sudo yunohost app setting ${borg_id} repository)"
mailalert="$(sudo yunohost app setting ${borg_id} mailalert)"
if [[ ! -z "$errors" ]]; then
    sudo yunohost app setting ${borg_id} state -v "failed"
else
    sudo yunohost app setting ${borg_id} state -v "successful"
fi

if [[ ! -z "$errors" && $mailalert != "never" ]]; then
    cat <(echo -e "$errors\n\n\n") "$log_file" "$err_file" | mail -s "[borg] Backup failed from $domain onto $repository" root
    exit 1
elif [ $mailalert == "always" ]; then
    cat $log_file | mail -s "[borg] Backup succeed from $domain onto $repository" root
    exit 0
fi