#!/bin/bash
# ==============================================================================
# OnEver Drive — Proxmox VE Host Provisioning Script
# Executed directly on the Proxmox VE Host Shell (pve)
# Creates native Debian 12 / 13 LXC Container and mounts persistent storage
# ==============================================================================

set -e

# Configuration variables
CT_ID=100
HOSTNAME="onever-backend"
MEMORY=2048
SWAP=1024
CORES=2
DISK_SIZE="20G"
STORAGE_POOL="local-lvm"
HOST_BACKUP_STORAGE="/mnt/pve/backup-pool" # Adjust to your Proxmox ZFS/LVM path
BRIDGE="vmbr0"
IP_CONFIG="dhcp" # Or: "192.168.1.100/24,gw=192.168.1.1"

echo "========================================================================"
echo "          ONEVER DRIVE — PROXMOX VE LXC CREATION SCRIPT                 "
echo "========================================================================"

# 1. Check Proxmox environment
if ! command -v pct &> /dev/null; then
    echo "[!] Error: 'pct' command not found. This script must be executed on a Proxmox VE node."
    exit 1
fi

# 2. Check if CT ID already exists
if pct status "$CT_ID" &> /dev/null; then
    echo "[!] Error: Container ID $CT_ID already exists. Please choose a different CT_ID."
    exit 1
fi

# 3. Locate or download Debian 12 / 13 standard template
echo "[*] Searching for Debian 12 / 13 template..."
pveam update
TEMPLATE=$(pveam available | grep -E "debian-(12|13)-standard" | tail -n 1 | awk '{print $2}')

if [ -z "$TEMPLATE" ]; then
    echo "[!] Could not automatically find Debian template. Using default debian-12-standard."
    TEMPLATE="debian-12-standard_12.2-1_amd64.tar.zst"
fi

if ! pveam list local | grep -q "$TEMPLATE"; then
    echo "[*] Downloading template: $TEMPLATE..."
    pveam download local "$TEMPLATE"
fi

TEMPLATE_PATH="local:vztmpl/$TEMPLATE"

# 4. Create persistent host directories if not present
echo "[*] Preparing host persistent backup storage at: $HOST_BACKUP_STORAGE..."
mkdir -p "$HOST_BACKUP_STORAGE/backups"
mkdir -p "$HOST_BACKUP_STORAGE/temp"
chmod 775 "$HOST_BACKUP_STORAGE/backups"
chmod 777 "$HOST_BACKUP_STORAGE/temp"

# 5. Create native LXC Container
echo "[*] Creating LXC container CT $CT_ID ($HOSTNAME)..."
pct create "$CT_ID" "$TEMPLATE_PATH" \
    --hostname "$HOSTNAME" \
    --memory "$MEMORY" \
    --swap "$SWAP" \
    --cores "$CORES" \
    --ostype debian \
    --storage "$STORAGE_POOL" \
    --rootfs "$STORAGE_POOL:$DISK_SIZE" \
    --net0 "name=eth0,bridge=$BRIDGE,ip=$IP_CONFIG" \
    --unprivileged 1 \
    --onboot 1 \
    --start 0

# 6. Mount persistent storage volumes directly to the LXC
echo "[*] Mounting host persistent storage pool into CT $CT_ID..."
pct set "$CT_ID" -mp0 "$HOST_BACKUP_STORAGE/backups,mp=/storage/backups"
pct set "$CT_ID" -mp1 "$HOST_BACKUP_STORAGE/temp,mp=/storage/temp"

# 7. Start container
echo "[*] Starting CT $CT_ID..."
pct start "$CT_ID"

echo ""
echo "========================================================================"
echo "[+] Container CT $CT_ID ($HOSTNAME) successfully created and started!"
echo "========================================================================"
echo ""
echo "Next step: Enter container and run the Debian native installer:"
echo "    pct enter $CT_ID"
echo "    git clone <REPO_URL> /opt/onever_drive"
echo "    bash /opt/onever_drive/deployment/proxmox/02-install-backend-debian.sh"
echo ""