#!/usr/bin/env bash
# =============================================================================
#  NixPanel Installer — Ubuntu 24.04 LTS only
#  Usage: bash install.sh [--admin-user NAME] [--admin-pass PASS] [--admin-email EMAIL]
# =============================================================================
set -euo pipefail

RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'
CYAN='\033[0;36m'; BOLD='\033[1m'; RESET='\033[0m'

info()    { echo -e "${CYAN}[INFO]${RESET}  $*"; }
success() { echo -e "${GREEN}[OK]${RESET}    $*"; }
warn()    { echo -e "${YELLOW}[WARN]${RESET}  $*"; }
error()   { echo -e "${RED}[ERROR]${RESET} $*" >&2; exit 1; }
step()    { echo -e "\n${BOLD}${CYAN}━━━  $*  ━━━${RESET}"; }

# ── Banner ────────────────────────────────────────────────────────────────────
echo -e "${BOLD}${CYAN}"
cat <<'EOF'
  _   _ _      ____                  _
 | \ | (_)_  _|  _ \ __ _ _ __   ___| |
 |  \| | \ \/ / |_) / _` | '_ \ / _ \ |
 | |\  | |>  <|  __/ (_| | | | |  __/ |
 |_| \_|_/_/\_\_|   \__,_|_| |_|\___|_|

 Web Hosting Control Panel
EOF
echo -e "${RESET}"

# ── Root check ────────────────────────────────────────────────────────────────
[[ $EUID -ne 0 ]] && error "Must be run as root. Try: sudo bash install.sh"

# ── OS check — Ubuntu 24.04 only ─────────────────────────────────────────────
step "Checking OS"

if [[ ! -f /etc/os-release ]]; then
  error "Cannot detect OS — /etc/os-release not found"
fi

. /etc/os-release

if [[ "${ID:-}" != "ubuntu" ]]; then
  error "NixPanel requires Ubuntu. Detected: ${PRETTY_NAME:-unknown}"
fi

UBUNTU_MAJOR=$(echo "${VERSION_ID:-0}" | cut -d. -f1)
if [[ "$UBUNTU_MAJOR" -lt 24 ]]; then
  error "NixPanel requires Ubuntu 24.04 LTS. Detected: ${PRETTY_NAME:-unknown}"
fi

ARCH=$(uname -m)
[[ "$ARCH" != "x86_64" && "$ARCH" != "aarch64" ]] && error "Unsupported architecture: $ARCH (x86_64 and aarch64 only)"

success "Ubuntu ${VERSION_ID} on ${ARCH} — OK"

# ── Argument parsing ──────────────────────────────────────────────────────────
ADMIN_USER="admin"
ADMIN_PASS=""
ADMIN_EMAIL=""
INSTALL_DIR="/opt/nixpanel"

while [[ $# -gt 0 ]]; do
  case $1 in
    --admin-user)  ADMIN_USER="$2";  shift 2 ;;
    --admin-pass)  ADMIN_PASS="$2";  shift 2 ;;
    --admin-email) ADMIN_EMAIL="$2"; shift 2 ;;
    --install-dir) INSTALL_DIR="$2"; shift 2 ;;
    *) warn "Unknown argument: $1"; shift ;;
  esac
done

# ── Generate secrets ──────────────────────────────────────────────────────────
gen_secret() { openssl rand -hex 32; }

GENERATED_PASS=false
if [[ -z "$ADMIN_PASS" ]]; then
  ADMIN_PASS=$(openssl rand -base64 16 | tr -dc 'a-zA-Z0-9' | head -c 16)
  GENERATED_PASS=true
fi

if [[ -z "$ADMIN_EMAIL" ]]; then
  ADMIN_EMAIL="admin@$(hostname -f 2>/dev/null || echo localhost)"
fi

MARIADB_ROOT_PASS=$(openssl rand -base64 24 | tr -dc 'a-zA-Z0-9' | head -c 24)
JWT_SECRET=$(gen_secret)
JWT_REFRESH_SECRET=$(gen_secret)

# ── Confirm ───────────────────────────────────────────────────────────────────
echo -e "${BOLD}Installation summary:${RESET}"
echo "  Install directory : $INSTALL_DIR"
echo "  Admin username    : $ADMIN_USER"
echo "  Admin email       : $ADMIN_EMAIL"
echo "  Admin password    : $([ "$GENERATED_PASS" = "true" ] && echo "<auto-generated>" || echo "$ADMIN_PASS")"
echo ""
read -r -p "Continue? [Y/n] " CONFIRM
CONFIRM="${CONFIRM:-Y}"
[[ "$CONFIRM" =~ ^[Yy]$ ]] || { echo "Aborted."; exit 0; }

# ── Logging ───────────────────────────────────────────────────────────────────
mkdir -p /var/log/nixpanel
LOG_FILE="/var/log/nixpanel/install.log"
exec > >(tee -a "$LOG_FILE") 2>&1
echo "======================================================"
echo " NixPanel Install Log — $(date -u '+%Y-%m-%d %H:%M:%S UTC')"
echo " OS: ${PRETTY_NAME}  Arch: ${ARCH}"
echo "======================================================"

# ── Idempotent step tracker ───────────────────────────────────────────────────
STATE_DIR="/var/lib/nixpanel/install"
mkdir -p "$STATE_DIR"

step_done() { [[ -f "$STATE_DIR/$1.done" ]]; }
mark_done() { touch "$STATE_DIR/$1.done"; }

# ── Update package index ──────────────────────────────────────────────────────
step "Updating package index"
apt-get update -qq
success "Package index updated"

# ── Base dependencies ─────────────────────────────────────────────────────────
step "Installing base dependencies"
if ! step_done "base_deps"; then
  apt-get install -y -qq \
    curl wget gnupg2 ca-certificates lsb-release software-properties-common \
    git build-essential openssl logrotate
  mark_done "base_deps"
fi
success "Base dependencies ready"

# ── Add ondrej/php PPA ────────────────────────────────────────────────────────
step "Adding PHP PPA"
if ! step_done "php_ppa"; then
  add-apt-repository -y ppa:ondrej/php >/dev/null 2>&1
  apt-get update -qq
  mark_done "php_ppa"
fi
success "PHP PPA ready"

# ── Node.js 22 via NodeSource ─────────────────────────────────────────────────
step "Installing Node.js 22 LTS"
if ! step_done "nodejs"; then
  curl -fsSL https://deb.nodesource.com/setup_22.x | bash - >/dev/null 2>&1
  apt-get install -y -qq nodejs
  mark_done "nodejs"
fi
success "Node.js $(node --version) ready"

# ── Disable systemd-resolved stub listener (frees port 53 for PowerDNS) ─────
step "Freeing port 53 for PowerDNS"
if ! step_done "resolved_stub"; then
  # Ubuntu 24.04 runs systemd-resolved with a stub listener on 127.0.0.53:53.
  # PowerDNS's apt post-install restart fails if this is still active.
  sed -i 's/#DNSStubListener=yes/DNSStubListener=no/' /etc/systemd/resolved.conf 2>/dev/null || true
  sed -i 's/^DNSStubListener=yes/DNSStubListener=no/' /etc/systemd/resolved.conf 2>/dev/null || true
  systemctl restart systemd-resolved 2>/dev/null || true
  mark_done "resolved_stub"
fi
success "Port 53 freed"

# ── Install all services in one pass ─────────────────────────────────────────
step "Installing web stack (Apache, PHP, Exim, Dovecot, PowerDNS, MariaDB)"
if ! step_done "packages"; then
  DEBIAN_FRONTEND=noninteractive apt-get install -y -qq \
    `# Web server` \
    apache2 apache2-utils \
    `# PHP 8.2` \
    php8.2-fpm php8.2-cli php8.2-mysql php8.2-curl php8.2-gd \
    php8.2-mbstring php8.2-xml php8.2-zip php8.2-bcmath php8.2-intl \
    php8.2-opcache php8.2-imagick \
    `# PHP 8.3` \
    php8.3-fpm php8.3-cli php8.3-mysql php8.3-curl php8.3-gd \
    php8.3-mbstring php8.3-xml php8.3-zip php8.3-bcmath php8.3-intl \
    php8.3-opcache php8.3-imagick \
    `# DNS` \
    pdns-server pdns-backend-bind \
    `# Mail` \
    exim4 exim4-daemon-heavy \
    dovecot-core dovecot-imapd dovecot-pop3d dovecot-lmtpd dovecot-managesieved \
    spamassassin spamc \
    `# Database (user data)` \
    mariadb-server mariadb-client \
    `# SSL` \
    certbot python3-certbot-apache \
    `# Security` \
    fail2ban iptables iptables-persistent \
    `# Utils` \
    sqlite3
  mark_done "packages"
fi
success "All packages installed"

# ── Pin packages to prevent apt from overriding NixPanel-managed versions ─────
step "Pinning managed packages"
if ! step_done "apt_pins"; then
  cat > /etc/apt/preferences.d/nixpanel-pins <<'PINS'
Package: apache2 apache2-*
Pin: release *
Pin-Priority: 1001

Package: php8.2-* php8.3-*
Pin: release *
Pin-Priority: 1001

Package: pdns-server pdns-backend-*
Pin: release *
Pin-Priority: 1001

Package: exim4 exim4-*
Pin: release *
Pin-Priority: 1001

Package: dovecot-*
Pin: release *
Pin-Priority: 1001

Package: mariadb-server mariadb-client
Pin: release *
Pin-Priority: 1001
PINS
  # Disable unattended upgrades (same as cPanel)
  systemctl disable --now unattended-upgrades 2>/dev/null || true
  mark_done "apt_pins"
fi
success "Package pins set"

# ── Create nixpanel system user ────────────────────────────────────────────────
step "Creating nixpanel system user"
if ! id nixpanel &>/dev/null; then
  useradd -r -s /usr/sbin/nologin -M -d "$INSTALL_DIR" nixpanel
fi
success "nixpanel user ready"

# ── Directory structure ────────────────────────────────────────────────────────
step "Creating directory structure"
mkdir -p "$INSTALL_DIR/data"
mkdir -p "$INSTALL_DIR/logs"
mkdir -p /etc/nixpanel
mkdir -p /var/www/letsencrypt/.well-known/acme-challenge
mkdir -p /etc/pdns/zones
success "Directories created"

# ── Configure Apache ──────────────────────────────────────────────────────────
step "Configuring Apache"
if ! step_done "apache"; then
  # Enable required modules
  a2enmod rewrite ssl proxy proxy_fcgi headers expires deflate 2>/dev/null || true

  # Disable default vhost
  a2dissite 000-default 2>/dev/null || true

  # Add panel ports to ports.conf
  if ! grep -q "Listen 2087" /etc/apache2/ports.conf 2>/dev/null; then
    cat >> /etc/apache2/ports.conf <<'PORTS'

# NixPanel ports
Listen 2087
Listen 2083
PORTS
  fi

  # Panel reverse proxy vhost — proxies 2087/2083 → Node.js on 127.0.0.1:4000
  cat > /etc/apache2/sites-available/nixpanel-panels.conf <<APACHE
# NixPanel admin/user panels — managed by NixPanel installer

<VirtualHost *:2087>
    ServerName nixserver

    ProxyPreserveHost On
    ProxyPass /api/ http://127.0.0.1:4000/api/ retry=0
    ProxyPassReverse /api/ http://127.0.0.1:4000/api/

    # WebSocket for live stats
    RewriteEngine On
    RewriteCond %{HTTP:Upgrade} websocket [NC]
    RewriteRule /ws/(.*) ws://127.0.0.1:4000/ws/\$1 [P,L]

    DocumentRoot ${INSTALL_DIR}/nixserver/dist
    <Directory ${INSTALL_DIR}/nixserver/dist>
        Options -Indexes
        AllowOverride None
        Require all granted
        FallbackResource /index.html
    </Directory>

    ErrorLog /var/log/apache2/nixserver-error.log
    CustomLog /var/log/apache2/nixserver-access.log combined
</VirtualHost>

<VirtualHost *:2083>
    ServerName nixclient

    ProxyPreserveHost On
    ProxyPass /api/ http://127.0.0.1:4000/api/ retry=0
    ProxyPassReverse /api/ http://127.0.0.1:4000/api/

    RewriteEngine On
    RewriteCond %{HTTP:Upgrade} websocket [NC]
    RewriteRule /ws/(.*) ws://127.0.0.1:4000/ws/\$1 [P,L]

    DocumentRoot ${INSTALL_DIR}/nixclient/dist
    <Directory ${INSTALL_DIR}/nixclient/dist>
        Options -Indexes
        AllowOverride None
        Require all granted
        FallbackResource /index.html
    </Directory>

    ErrorLog /var/log/apache2/nixclient-error.log
    CustomLog /var/log/apache2/nixclient-access.log combined
</VirtualHost>
APACHE

  a2ensite nixpanel-panels
  systemctl enable apache2
  systemctl restart apache2

  # Certbot deploy hook to reload Apache on certificate renewal
  mkdir -p /etc/letsencrypt/renewal-hooks/deploy
  cat > /etc/letsencrypt/renewal-hooks/deploy/nixpanel-reload-apache.sh <<'HOOK'
#!/bin/bash
systemctl reload apache2
HOOK
  chmod +x /etc/letsencrypt/renewal-hooks/deploy/nixpanel-reload-apache.sh

  mark_done "apache"
fi
success "Apache configured"

# ── Configure PowerDNS ────────────────────────────────────────────────────────
step "Configuring PowerDNS"
if ! step_done "pdns"; then
  # Stop any running instance first
  systemctl stop pdns 2>/dev/null || true

  # Create empty bindbackend config
  touch /etc/pdns/bindbackend.conf
  chmod 640 /etc/pdns/bindbackend.conf

  # Write PowerDNS config using bind backend
  cat > /etc/pdns/pdns.conf <<'PDNS'
# NixPanel-managed PowerDNS configuration
launch=bind
bind-config=/etc/pdns/bindbackend.conf
bind-check-interval=60

local-address=0.0.0.0
local-port=53
allow-recursion=0.0.0.0/0

log-dns-queries=no
loglevel=3

# Security
setuid=pdns
setgid=pdns
PDNS

  systemctl enable pdns
  systemctl start pdns

  mark_done "pdns"
fi
success "PowerDNS configured"

# ── Configure Exim4 ───────────────────────────────────────────────────────────
step "Configuring Exim4"
if ! step_done "exim"; then
  # Create virtual mail flat files (NixPanel manages these)
  touch /etc/exim4/virtual_domains
  touch /etc/exim4/virtual_mailboxes
  touch /etc/exim4/virtual_aliases
  chmod 640 /etc/exim4/virtual_domains /etc/exim4/virtual_mailboxes /etc/exim4/virtual_aliases

  # Set Exim to internet site mode via debconf
  debconf-set-selections <<'DEBCONF'
exim4-config exim4/dc_eximconfig_configtype select internet site
exim4-config exim4/dc_other_hostnames string localhost
exim4-config exim4/dc_local_interfaces string
exim4-config exim4/dc_readhost string
exim4-config exim4/dc_relay_domains string
exim4-config exim4/dc_minimaldns boolean false
exim4-config exim4/dc_relay_nets string
exim4-config exim4/dc_smarthost string
exim4-config exim4/hide_mailname boolean true
exim4-config exim4/mailname-file string /etc/mailname
DEBCONF

  dpkg-reconfigure -f noninteractive exim4-config 2>/dev/null || true

  systemctl enable exim4
  systemctl restart exim4

  mark_done "exim"
fi
success "Exim4 configured"

# ── Configure Dovecot ─────────────────────────────────────────────────────────
step "Configuring Dovecot"
if ! step_done "dovecot"; then
  # Create passwd file for virtual mailboxes
  touch /etc/dovecot/passwd
  chmod 640 /etc/dovecot/passwd
  chown root:dovecot /etc/dovecot/passwd

  # Configure Dovecot for passwd-file authentication
  cat > /etc/dovecot/conf.d/10-auth.conf <<'DOVEAUTH'
disable_plaintext_auth = yes
auth_mechanisms = plain login

!include auth-passwdfile.conf.ext
DOVEAUTH

  cat > /etc/dovecot/conf.d/auth-passwdfile.conf.ext <<'DOVEPF'
passdb {
  driver = passwd-file
  args = scheme=SHA512-CRYPT /etc/dovecot/passwd
}

userdb {
  driver = passwd-file
  args = /etc/dovecot/passwd
  default_fields = uid=vmail gid=vmail home=/home/%d/%n
}
DOVEPF

  cat > /etc/dovecot/conf.d/10-mail.conf <<'DOVEMAIL'
mail_location = maildir:/home/%d/%n/Maildir
mail_privileged_group = mail
DOVEMAIL

  systemctl enable dovecot
  systemctl restart dovecot

  mark_done "dovecot"
fi
success "Dovecot configured"

# ── Configure SpamAssassin ────────────────────────────────────────────────────
step "Configuring SpamAssassin"
if ! step_done "spamassassin"; then
  # Ubuntu 24.04: service unit is 'spamd', not 'spamassassin'
  systemctl enable spamd
  systemctl start spamd
  mark_done "spamassassin"
fi
success "SpamAssassin configured"

# ── Configure MariaDB ─────────────────────────────────────────────────────────
step "Configuring MariaDB"
if ! step_done "mariadb"; then
  systemctl enable --now mariadb

  # Secure MariaDB (remove anonymous users, test db, set root password)
  mariadb -u root <<SQL
  ALTER USER 'root'@'localhost' IDENTIFIED BY '${MARIADB_ROOT_PASS}';
  DELETE FROM mysql.user WHERE User='';
  DELETE FROM mysql.user WHERE User='root' AND Host NOT IN ('localhost','127.0.0.1','::1');
  DROP DATABASE IF EXISTS test;
  DELETE FROM mysql.db WHERE Db='test' OR Db='test\\_%';
  FLUSH PRIVILEGES;
SQL

  # Write MariaDB root credentials file for NixPanel to use
  cat > /etc/nixpanel/mariadb.conf <<MYCNF
[client]
host=127.0.0.1
port=3306
user=root
password=${MARIADB_ROOT_PASS}
MYCNF
  chmod 600 /etc/nixpanel/mariadb.conf

  mark_done "mariadb"
fi
success "MariaDB configured"

# ── Clone / update NixPanel ───────────────────────────────────────────────────
step "Installing NixPanel"
if [[ -d "$INSTALL_DIR/.git" ]]; then
  info "Existing installation found — pulling latest..."
  git -C "$INSTALL_DIR" pull --ff-only
else
  info "Cloning repository into $INSTALL_DIR..."
  git clone https://github.com/NixReaper/nixpanel-server.git "$INSTALL_DIR"
fi
success "NixPanel source ready at $INSTALL_DIR"

# ── Write .env ────────────────────────────────────────────────────────────────
step "Writing environment config"
SERVER_IP=$(hostname -I | awk '{print $1}')

cat > "$INSTALL_DIR/server/.env" <<ENV
# Generated by NixPanel installer — $(date -u '+%Y-%m-%d %H:%M:%S UTC')

# Panel database (SQLite)
DATABASE_URL="file:${INSTALL_DIR}/data/nixpanel.db"

# JWT
JWT_SECRET="${JWT_SECRET}"
JWT_EXPIRES_IN="15m"
JWT_REFRESH_SECRET="${JWT_REFRESH_SECRET}"
JWT_REFRESH_EXPIRES_IN="7d"

# Server
NODE_ENV="production"
PORT=4000
HOST="127.0.0.1"

# Admin credentials (used during initial seed only — change after first login)
ADMIN_USERNAME="${ADMIN_USER}"
ADMIN_PASSWORD="${ADMIN_PASS}"
ADMIN_EMAIL="${ADMIN_EMAIL}"

# MariaDB (for hosting account databases)
MARIADB_HOST=127.0.0.1
MARIADB_PORT=3306
MARIADB_USER=root
MARIADB_PASSWORD=${MARIADB_ROOT_PASS}

# Licensing
LICENSING_SERVER_URL="https://license.nixpanel.io"
LICENSE_KEY=""

# Paths
HOME_DIR="/home"
APACHE_SITES_DIR="/etc/apache2/sites-available"
APACHE_ENABLED_DIR="/etc/apache2/sites-enabled"
PDNS_ZONES_DIR="/etc/pdns/zones"
PDNS_BIND_BACKEND="/etc/pdns/bindbackend.conf"
EXIM_VIRTUAL_DOMAINS="/etc/exim4/virtual_domains"
EXIM_VIRTUAL_MAILBOXES="/etc/exim4/virtual_mailboxes"
EXIM_VIRTUAL_ALIASES="/etc/exim4/virtual_aliases"
DOVECOT_PASSWD="/etc/dovecot/passwd"
CERTBOT_WEBROOT="/var/www/letsencrypt"
LETSENCRYPT_LIVE="/etc/letsencrypt/live"
ENV

chmod 600 "$INSTALL_DIR/server/.env"
success ".env written"

# ── npm install ───────────────────────────────────────────────────────────────
step "Installing Node.js dependencies"
cd "$INSTALL_DIR"
npm install --silent
success "npm dependencies installed"

# ── Prisma generate + db push ─────────────────────────────────────────────────
step "Initialising panel database"
cd "$INSTALL_DIR/server"
npx prisma generate
DATABASE_URL="file:${INSTALL_DIR}/data/nixpanel.db" npx prisma db push
chown root:nixpanel "${INSTALL_DIR}/data/nixpanel.db"
chmod 640 "${INSTALL_DIR}/data/nixpanel.db"
success "Panel database (SQLite) ready"

# ── Seed ─────────────────────────────────────────────────────────────────────
step "Seeding initial admin and default packages"
DATABASE_URL="file:${INSTALL_DIR}/data/nixpanel.db" \
ADMIN_USERNAME="${ADMIN_USER}" \
ADMIN_PASSWORD="${ADMIN_PASS}" \
ADMIN_EMAIL="${ADMIN_EMAIL}" \
  npx tsx src/db/seed.ts
success "Admin account and default packages seeded"

# ── Build ─────────────────────────────────────────────────────────────────────
step "Building frontends and server"
cd "$INSTALL_DIR"
npm run build --workspace=nixserver --silent
npm run build --workspace=nixclient --silent
cd "$INSTALL_DIR/server"
npm run build --silent
success "Build complete"

# ── systemd service ───────────────────────────────────────────────────────────
step "Creating systemd service"
cat > /etc/systemd/system/nixpanel.service <<UNIT
[Unit]
Description=NixPanel Web Hosting Control Panel
After=network.target mariadb.service apache2.service pdns.service

[Service]
Type=simple
User=root
WorkingDirectory=${INSTALL_DIR}/server
EnvironmentFile=${INSTALL_DIR}/server/.env
ExecStart=$(which node) --enable-source-maps dist/index.js
Restart=always
RestartSec=5
StandardOutput=journal
StandardError=journal
SyslogIdentifier=nixpanel
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
UNIT

systemctl daemon-reload
systemctl enable nixpanel
systemctl start nixpanel
success "nixpanel.service started"

# ── Firewall ──────────────────────────────────────────────────────────────────
step "Configuring firewall (iptables)"
if ! step_done "firewall"; then
  # Flush existing rules
  iptables -F INPUT
  iptables -F FORWARD
  iptables -F OUTPUT

  # Default policies
  iptables -P INPUT DROP
  iptables -P FORWARD DROP
  iptables -P OUTPUT ACCEPT

  # Allow established connections and loopback
  iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
  iptables -A INPUT -i lo -j ACCEPT

  # Standard ports
  for PORT in 22 80 443 25 465 587 110 143 993 995 4190 2082 2083 2086 2087; do
    iptables -A INPUT -p tcp --dport "$PORT" -j ACCEPT
  done

  # DNS
  iptables -A INPUT -p tcp --dport 53 -j ACCEPT
  iptables -A INPUT -p udp --dport 53 -j ACCEPT

  # Save rules so they persist across reboots
  netfilter-persistent save

  mark_done "firewall"
fi
success "Firewall rules applied"

# ── Fail2ban ──────────────────────────────────────────────────────────────────
step "Configuring Fail2ban"
if ! step_done "fail2ban"; then
  cat > /etc/fail2ban/jail.d/nixpanel.conf <<'F2B'
[sshd]
enabled  = true
maxretry = 5
bantime  = 3600
findtime = 600

[apache-auth]
enabled  = true
maxretry = 10
bantime  = 600

[exim]
enabled  = true

[dovecot]
enabled  = true
F2B

  systemctl enable --now fail2ban
  mark_done "fail2ban"
fi
success "Fail2ban configured"

# ── logrotate ─────────────────────────────────────────────────────────────────
step "Configuring log rotation"
cat > /etc/logrotate.d/nixpanel <<'LR'
/var/log/nixpanel/*.log
/opt/nixpanel/logs/*.log {
    daily
    rotate 14
    compress
    delaycompress
    missingok
    notifempty
    sharedscripts
    postrotate
        systemctl reload nixpanel > /dev/null 2>&1 || true
    endscript
}
LR
success "Log rotation configured"

# ── Health check ──────────────────────────────────────────────────────────────
step "Waiting for NixPanel to start"

MAX_WAIT=30
WAITED=0
until curl -sf http://127.0.0.1:4000/api/health >/dev/null 2>&1; do
  sleep 2
  WAITED=$((WAITED + 2))
  if [[ $WAITED -ge $MAX_WAIT ]]; then
    warn "Health check timed out. Check: journalctl -u nixpanel -n 50"
    break
  fi
done

if curl -sf http://127.0.0.1:4000/api/health >/dev/null 2>&1; then
  success "NixPanel API is responding"
fi

# ── Save credentials ──────────────────────────────────────────────────────────
CRED_FILE="/root/.nixpanel_credentials"
cat > "$CRED_FILE" <<CREDS
NixPanel Credentials — $(date -u '+%Y-%m-%d %H:%M:%S UTC')
============================================================
NixServer (Admin) : http://${SERVER_IP}:2087
NixClient (User)  : http://${SERVER_IP}:2083
Admin User        : ${ADMIN_USER}
Admin Password    : ${ADMIN_PASS}
Admin Email       : ${ADMIN_EMAIL}
MariaDB Root Pass : ${MARIADB_ROOT_PASS}
Install Dir       : ${INSTALL_DIR}
Install Log       : ${LOG_FILE}
CREDS
chmod 600 "$CRED_FILE"

# ── Summary ───────────────────────────────────────────────────────────────────
echo ""
echo -e "${BOLD}${GREEN}╔══════════════════════════════════════════════════════╗${RESET}"
echo -e "${BOLD}${GREEN}║           NixPanel Installation Complete!            ║${RESET}"
echo -e "${BOLD}${GREEN}╚══════════════════════════════════════════════════════╝${RESET}"
echo ""
echo -e "  ${BOLD}NixServer (Admin Panel)${RESET}   http://${SERVER_IP}:2087"
echo -e "  ${BOLD}NixClient (User Panel)${RESET}    http://${SERVER_IP}:2083"
echo ""
echo -e "  ${BOLD}Admin username:${RESET} ${ADMIN_USER}"
echo -e "  ${BOLD}Admin password:${RESET} ${ADMIN_PASS}"
echo ""
echo -e "  ${BOLD}Useful commands:${RESET}"
echo -e "  systemctl status nixpanel      # panel status"
echo -e "  journalctl -u nixpanel -f      # live logs"
echo -e "  systemctl restart nixpanel     # restart panel"
echo ""
echo -e "  Credentials saved to: ${BOLD}${CRED_FILE}${RESET}"
echo ""
if [[ "$GENERATED_PASS" == "true" ]]; then
  echo -e "  ${YELLOW}${BOLD}Save your admin password — it will not be shown again!${RESET}"
  echo ""
fi