#!/bin/bash

# RinCoin Wallet Backup Script
# Dumps all private keys to a secure text file for backup.
# WARNING: This file contains sensitive private keys. Store it securely (encrypted, offline).
# Do not share or email it. Anyone with this file can spend your coins.

set -euo pipefail

# Configuration
CONTAINER="rincoin-node"
WALLET="main"
BACKUP_DIR="${HOME}/rin_wallet_backups"
TIMESTAMP=$(date +%Y%m%d_%H%M%S)
BACKUP_FILE="${BACKUP_DIR}/rin_wallet_backup_${TIMESTAMP}.txt"

# Ensure backup directory exists
mkdir -p "$BACKUP_DIR"

# Check if container is running
if ! sudo docker ps --format '{{.Names}}' | grep -q "^${CONTAINER}$"; then
    echo "Error: ${CONTAINER} container is not running. Start it with 'sudo docker start ${CONTAINER}'."
    exit 1
fi

# Ensure wallet is loaded
CLI_CMD=(sudo docker exec "$CONTAINER" rincoin-cli -datadir=/data -conf=/data/rincoin.conf -rpcwallet="$WALLET")
if ! "${CLI_CMD[@]//-rpcwallet=$WALLET/}" listwallets | grep -q '"main"'; then
    echo "Wallet '${WALLET}' not loaded. Attempting to load..."
    "${CLI_CMD[@]//-rpcwallet=$WALLET/}" loadwallet "$WALLET" >/dev/null 2>&1 || {
        echo "Failed to load wallet. Ensure it exists."
        exit 1
    }
fi

echo "Dumping wallet to: $BACKUP_FILE"
echo "This may take a moment..."

# Dump wallet
"${CLI_CMD[@]}" dumpwallet "$BACKUP_FILE"

# Verify the file was created and has content
if [[ ! -f "$BACKUP_FILE" ]]; then
    echo "Error: Backup file was not created."
    exit 1
fi

LINE_COUNT=$(wc -l < "$BACKUP_FILE")
if [[ $LINE_COUNT -lt 10 ]]; then
    echo "Warning: Backup file seems too small (${LINE_COUNT} lines). Check for errors."
    exit 1
fi

echo "✅ Wallet successfully backed up to: $BACKUP_FILE"
echo ""
echo "🔐 SECURITY REMINDERS:"
echo "  - This file contains private keys for ALL addresses in the wallet."
echo "  - Encrypt it immediately: gpg -c $BACKUP_FILE"
echo "  - Store on encrypted media (e.g., USB drive in safe)."
echo "  - Delete the unencrypted file after encryption."
echo "  - Test restoration on a testnet node before relying on it."
echo ""
echo "File size: $(du -h "$BACKUP_FILE" | cut -f1)"
echo "Lines: $LINE_COUNT"