#!/bin/bash

# Enhanced script to list available backup sources and targets
# Shows options for all three backup modes

echo "=== Enhanced Simple LVM Backup with Borg Support - Available Options ==="
echo ""

echo "=== SOURCES ==="
echo ""
echo "Logical Volumes (for lv-to-lv and lv-to-raw modes):"
echo "---------------------------------------------------"
if command -v lvs >/dev/null 2>&1; then
    echo "Path                     Size     VG Name"
    echo "----------------------------------------"
    lvs --noheadings -o lv_path,lv_size,vg_name | while read lv_path lv_size vg_name; do
        printf "%-24s %-8s %s\n" "$lv_path" "$lv_size" "$vg_name"
    done
else
    echo "LVM not available"
fi

echo ""
echo "Volume Groups (for vg-to-raw mode):"
echo "-----------------------------------"
if command -v vgs >/dev/null 2>&1; then
    echo "VG Name          Size     PV Count"
    echo "----------------------------------"
    vgs --noheadings -o vg_name,vg_size,pv_count | while read vg_name vg_size pv_count; do
        printf "%-16s %-8s %s PVs\n" "$vg_name" "$vg_size" "$pv_count"
    done
else
    echo "LVM not available"
fi

echo ""
echo "=== TARGETS ==="
echo ""
echo "Existing Logical Volumes (for lv-to-lv mode):"
echo "---------------------------------------------"
if command -v lvs >/dev/null 2>&1; then
    echo "Path                     Size     VG Name"
    echo "----------------------------------------"
    lvs --noheadings -o lv_path,lv_size,vg_name | while read lv_path lv_size vg_name; do
        # Highlight external/backup VGs
        if [[ "$vg_name" == *"migration"* ]] || [[ "$vg_name" == *"external"* ]] || [[ "$vg_name" == *"backup"* ]]; then
            printf "%-24s %-8s %s (backup VG)\n" "$lv_path" "$lv_size" "$vg_name"
        else
            printf "%-24s %-8s %s\n" "$lv_path" "$lv_size" "$vg_name"
        fi
    done
else
    echo "LVM not available"
fi

echo ""
echo "Raw Block Devices (for lv-to-raw and vg-to-raw modes):"
echo "------------------------------------------------------"
echo "Device     Size     Model"
echo "-------------------------"
lsblk -dno NAME,SIZE,MODEL | grep -E '^sd|^nvme' | while read name size model; do
    printf "/dev/%-6s %-8s %s\n" "$name" "$size" "$model"
done

echo ""
echo "=== USAGE EXAMPLES ==="
echo ""
echo "1. LV to LV (update existing backup):"
echo "   sudo ./enhanced_simple_backup.sh lv-to-lv /dev/internal-vg/root /dev/backup-vg/root"
echo ""
echo "2. LV to Raw Device (fresh backup):"
echo "   sudo ./enhanced_simple_backup.sh lv-to-raw /dev/internal-vg/root /dev/sdb"
echo ""
echo "3. Entire VG to Raw Device (complete clone):"
echo "   sudo ./enhanced_simple_backup.sh vg-to-raw internal-vg /dev/sdb"
echo ""
echo "4. LV to Borg Repository (block-level backup):"
echo "   sudo ./enhanced_simple_backup.sh lv-to-borg /dev/internal-vg/root /path/to/borg/repo --new-repo"
echo "   → Stores raw snapshot as 'root.img' in Borg repo"
echo ""
echo "5. Entire VG to Borg Repository (all LVs as block devices):"
echo "   sudo ./enhanced_simple_backup.sh vg-to-borg internal-vg /path/to/borg/repo --encryption repokey"
echo "   → Creates separate archives for each LV (space-efficient, one LV at a time)"
echo ""
echo "=== GUI VERSION ==="
echo "   sudo python3 simple_backup_gui.py"
echo ""
echo "=== IMPORTANT NOTES ==="
echo "- Always run as root (sudo)"
echo "- lv-to-lv: Updates existing backup LV"
echo "- lv-to-raw: Creates fresh backup, overwrites target device"
echo "- vg-to-raw: Clones entire VG including LVM metadata"
echo "- lv-to-borg/vg-to-borg: Creates block-level backups in Borg (preserves exact LV state)"
echo "- LV→Borg: Single archive with one .img file, VG→Borg: Separate archives per LV"
echo "- VG→Borg processes one LV at a time to avoid space issues"
echo "- Borg backups are deduplicated, compressed, and encrypted"
echo "- Borg backups require: sudo apt install borgbackup"
echo "- Make sure target devices are unmounted before backup"
echo ""