#!/usr/bin/env bash
# Remove everything install.sh set up: the service, firewall rule, udev rule,
# the commands and the virtualenv. Mic settings are left as they are.
set -euo pipefail

APP=dgm20-linux
DATA=${XDG_DATA_HOME:-$HOME/.local/share}/$APP
BIN=$HOME/.local/bin
UNIT=${XDG_CONFIG_HOME:-$HOME/.config}/systemd/user/dgm20-web.service
STATE=$DATA/install.state
DRY=0

case ${1:-} in
    --dry-run) DRY=1 ;;
    -h|--help) echo "Usage: ./uninstall.sh [--dry-run]"; exit 0 ;;
    "") ;;
    *) echo "unknown option: $1" >&2; exit 2 ;;
esac

say() { printf '\033[1m==>\033[0m %s\n' "$*"; }
run() { if [ $DRY = 1 ]; then printf '    [dry-run] %s\n' "$*"; else "$@"; fi; }

[ "$(id -u)" != 0 ] || { echo "run this as your normal user, not root" >&2; exit 1; }

if [ -f "$STATE" ]; then
    while IFS= read -r entry; do
        kind=${entry%% *}
        arg=${entry#* }
        case $kind in
            service)
                say "Stopping the background service"
                run systemctl --user disable --now "$arg" || true
                run rm -f "$UNIT"
                run systemctl --user daemon-reload
                ;;
            firewalld)
                say "Removing the firewalld rule"
                run sudo firewall-cmd --permanent --remove-rich-rule="$arg" || true
                run sudo firewall-cmd --reload
                ;;
            ufw)
                read -r subnet port <<<"$arg"
                say "Removing the ufw rule"
                run sudo ufw delete allow from "$subnet" to any port "$port" proto tcp || true
                ;;
            udev)
                say "Removing the udev rule, sudo needed"
                run sudo rm -f "$arg"
                run sudo udevadm control --reload
                ;;
        esac
    done < <(tac "$STATE")
else
    echo "No install record found in $STATE; removing the program files only."
fi

say "Removing the program"
for cmd in dgm20ctl dgm20-web; do
    if [ -L "$BIN/$cmd" ] && [[ $(readlink "$BIN/$cmd") == "$DATA"/* ]]; then
        run rm -f "$BIN/$cmd"
    fi
done
run rm -rf "$DATA"
say "Done."