#!/bin/bash
# pct-create.sh
# One-command LXC container provisioner for Proxmox VE.
# Creates a container with sane defaults — no GUI needed.
#
# Usage: bash pct-create.sh <id> <hostname> <ip>
# Example: bash pct-create.sh 105 grafana 192.168.1.105
#
# Run on the Proxmox host as root.

set -euo pipefail

# ── Config — edit these defaults ────────────────────────────────
TEMPLATE="local:vztmpl/ubuntu-22.04-standard_22.04-1_amd64.tar.zst"
STORAGE="local-lvm"
BRIDGE="vmbr0"
GATEWAY="192.168.1.1"
NAMESERVER="1.1.1.1"
CORES=2
MEMORY=1024          # MB
SWAP=512             # MB
DISK=8               # GB
SSH_KEY_FILE="/root/.ssh/id_ed25519.pub"

# ── Parse args ───────────────────────────────────────────────────
if [[ $# -lt 3 ]]; then
  echo "Usage: $0 <vmid> <hostname> <ip-without-cidr>"
  echo "Example: $0 105 grafana 192.168.1.105"
  exit 1
fi

VMID="$1"
HOSTNAME="$2"
IP="$3"

# ── Validate ─────────────────────────────────────────────────────
if pct status "$VMID" &>/dev/null; then
  echo "ERROR: Container $VMID already exists"
  exit 1
fi

if [[ ! -f "$SSH_KEY_FILE" ]]; then
  echo "WARNING: SSH key not found at $SSH_KEY_FILE — container will have no SSH key"
  SSH_KEY_ARG=""
else
  SSH_KEY_ARG="--ssh-public-keys $SSH_KEY_FILE"
fi

echo "Creating container:"
echo "  ID:       $VMID"
echo "  Hostname: $HOSTNAME"
echo "  IP:       ${IP}/24"
echo "  Gateway:  $GATEWAY"
echo "  RAM:      ${MEMORY}MB"
echo "  Disk:     ${DISK}GB on $STORAGE"
echo ""
read -rp "Continue? [y/N] " confirm
[[ "$confirm" =~ ^[Yy]$ ]] || exit 0

# ── Create container ─────────────────────────────────────────────
pct create "$VMID" "$TEMPLATE" \
  --hostname "$HOSTNAME" \
  --cores "$CORES" \
  --memory "$MEMORY" \
  --swap "$SWAP" \
  --net0 "name=eth0,bridge=${BRIDGE},ip=${IP}/24,gw=${GATEWAY}" \
  --nameserver "$NAMESERVER" \
  --rootfs "${STORAGE}:${DISK}" \
  --unprivileged 1 \
  --features nesting=1 \
  --onboot 1 \
  $SSH_KEY_ARG

# ── Start and configure ──────────────────────────────────────────
pct start "$VMID"
sleep 3

# Update packages inside the container
pct exec "$VMID" -- bash -c "apt update -qq && apt install -y -qq curl wget git htop"

echo ""
echo "✓ Container $VMID ($HOSTNAME) created and running"
echo "  Connect: pct enter $VMID"
echo "  SSH:     ssh root@${IP}"