#!/bin/bash
set_snapper_defaults () {
    # Set the config to 0 retention, has to be changed by user
    sudo snapper set-config "TIMELINE_MIN_AGE=1800"
    sudo snapper set-config "TIMELINE_LIMIT_DAILY=0"
    sudo snapper set-config "TIMELINE_LIMIT_HOURLY=0"
    sudo snapper set-config "TIMELINE_LIMIT_MONTHLY=0"
    sudo snapper set-config "TIMELINE_LIMIT_WEEKLY=0"
    sudo snapper set-config "TIMELINE_LIMIT_QUARTERLY=0"
    sudo snapper set-config "TIMELINE_LIMIT_YEARLY=0"

    # Set manual/boot retention to 0
    sudo snapper set-config "NUMBER_MIN_AGE=1800"
    sudo snapper set-config "NUMBER_LIMIT=0"
    sudo snapper set-config "NUMBER_LIMIT_IMPORTANT=0"

    # Enable cleanup
    sudo systemctl enable --now snapper-cleanup.timer
}

cleanup_snapper () {
    sudo snapper cleanup number
    sudo snapper cleanup timeline 
}

disable_snapper () {
    # Make a config for /var/home as /home will not work
    sudo snapper -c root delete-config 

    # Disable the timeline and boot timers
    sudo systemctl disable --now snapper-timeline.timer
    sudo systemctl disable --now snapper-boot.timer 
}

if [ -z "$1" ] || [ "$1" == "enable" ]; then
    # Create an empty config for the home subvolume if a root config does not exist
    if ! sudo snapper get-config >/dev/null 2>&1; then
        # Make a config for /var/home as /home will not work
        sudo snapper create-config /var/home

        # Set the snapper config settings
        set_snapper_defaults

        # Disable the timeline and boot timers
        sudo systemctl disable --now snapper-timeline.timer
        sudo systemctl disable --now snapper-boot.timer

        # Launch btrfs assistant so people can change the settings
        zenity --info --text="Please change retention settings to what you want in the Snapper Settings tab in btrfs-assistant. Deleted data that still exist in a snapshot will still use disk space!"
        btrfs-assistant-launcher &
    fi
elif [ "$1" == "clean" ]; then
    cleanup_snapper
elif [ "$1" == "wipe" ]; then
    set_snapper_defaults
    cleanup_snapper
    disable_snapper
    sudo systemctl disable --now snapper-cleanup.timer
else
    disable_snapper
fi