#!/usr/bin/env bash
# backuper installer
#
#   curl -fsSL https://git.arabianq.ru/arabianq/backuper/raw/branch/main/install.sh | bash
#   BACKUPER_REPO=https://git.arabianq.ru/arabianq/backuper.git ./install.sh
#
# Env:
#   BACKUPER_REPO   git URL of this repo (required unless edited below)
#   BACKUPER_DIR    install directory (default /opt/backuper)
#   BACKUPER_TIMER  1 = enable the daily systemd timer (default 1)
set -euo pipefail

REPO_URL="${BACKUPER_REPO:-https://git.arabianq.ru/arabianq/backuper.git}"
DIR="${BACKUPER_DIR:-/opt/backuper}"
ENABLE_TIMER="${BACKUPER_TIMER:-1}"

log()  { printf '\033[32m[INFO]\033[0m %s\n' "$*"; }
die()  { printf '\033[31m[ERR ]\033[0m %s\n' "$*" >&2; exit 1; }

[ "$(id -u)" = 0 ] || die "run as root (sudo)"
[ -n "$REPO_URL" ] || die "set the repo URL: BACKUPER_REPO=https://git.arabianq.ru/arabianq/backuper.git"

command -v git >/dev/null 2>&1 || die "git is required"

if [ ! -d "$DIR/.git" ] && [ -f /etc/systemd/system/backuper.service ]; then
  detected=$(awk '$1 ~ /^ExecStart=/ {sub(/^ExecStart=/, "", $1); print $1; exit}' /etc/systemd/system/backuper.service)
  detected=$(dirname "$(dirname "$detected")")
  if [ -x "$detected/bin/backuper" ]; then
    DIR=$detected
    log "existing installation detected: $DIR"
  fi
fi

if [ -d "$DIR/.git" ]; then
  log "updating existing installation in $DIR"
  git -C "$DIR" pull --ff-only
elif [ -d "$DIR" ]; then
  die "$DIR already exists and is not a git clone (remove it or set BACKUPER_DIR)"
else
  [ -n "$REPO_URL" ] || die "set the repo URL: BACKUPER_REPO=https://git.arabianq.ru/arabianq/backuper.git"
  log "cloning into $DIR"
  git clone --depth 1 "$REPO_URL" "$DIR"
fi

[ -f "$DIR/backup.conf" ] || cp "$DIR/backup.conf.example" "$DIR/backup.conf"
mkdir -p "$DIR/conf.d"
chmod +x "$DIR/bin/backuper"
chown -R root:root "$DIR"

log "checking dependencies (installs what is missing)"
"$DIR/bin/backuper" check

cp "$DIR"/systemd/backuper.service "$DIR"/systemd/backuper@.service "$DIR"/systemd/backuper.timer /etc/systemd/system/
systemctl daemon-reload
if [ "$ENABLE_TIMER" = 1 ]; then
  systemctl enable --now backuper.timer
  log "daily timer enabled (04:00 + jitter)"
fi

log "installed into $DIR"
log "next steps:"
log "  1) edit $DIR/backup.conf            # cloud remote, retention, webhook"
log "  2) cp $DIR/examples/node.conf.example $DIR/conf.d/<node>.conf && edit it"
log "  3) rclone config                    # create the remote named in backup.conf"
log "  4) $DIR/bin/backuper run --dry && $DIR/bin/backuper run"