#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=backup.env
source "$SCRIPT_DIR/backup.env"

# ==============================================================================
# BACKUP-SPECIFIC CONFIGURATION
# ==============================================================================
BACKUP_LABEL="${HOSTNAME}-root"
EXCLUDE_FILE="/opt/backup/exclude"
LOG_FILE="${SCRIPT_DIR}/backup.log"

# ==============================================================================
# EXECUTION
# ==============================================================================
if [ ! -f "$EXCLUDE_FILE" ]; then
    echo "error: exclude list not found at $EXCLUDE_FILE — run setup.sh first" >&2
    exit 1
fi

echo "Starting Proxmox Backup for ${HOSTNAME}..."

EXCLUDE_ARGS=()
while IFS= read -r line; do
    [ -z "$line" ] && continue
    EXCLUDE_ARGS+=(--exclude "$line")
done < "$EXCLUDE_FILE"

if proxmox-backup-client backup "${BACKUP_LABEL}.pxar:/" \
    --keyfile "$ENCRYPTION_KEY_FILE" \
    --ns "$BACKUP_NS" \
    "${EXCLUDE_ARGS[@]}" 2>&1 | tee "$LOG_FILE"; then
    echo "Backup completed successfully!"
else
    echo "Backup FAILED — see $LOG_FILE" >&2
    if [ -n "${NOTIFY_EMAIL:-}" ]; then
        {
            echo "To: $NOTIFY_EMAIL"
            echo "From: root@${HOSTNAME}"
            echo "Subject: [pbs-backup] FAILED on ${HOSTNAME}"
            echo
            echo "The Proxmox backup on ${HOSTNAME} failed at $(date -R)."
            echo
            echo "--- backup log ---"
            cat "$LOG_FILE"
        } | sendmail -t
    fi
    exit 1
fi