#!/bin/bash
set -euo pipefail

## Restore a Discourse backup from an existing instance
## Usage: bash scripts/restore-backup.sh <path-to-backup.tar.gz>

DISCOURSE_DIR="/opt/discourse"
BACKUP_DIR="/opt/discourse/shared/standalone/backups/default"

if [ $# -eq 0 ]; then
    echo "Usage: $0 <path-to-backup.tar.gz>"
    echo ""
    echo "Steps to get a backup from the existing community.cadcad.org:"
    echo "  1. Log into the existing Discourse as admin"
    echo "  2. Go to /admin/backups"
    echo "  3. Click 'Backup' to create a new backup"
    echo "  4. Download the .tar.gz file"
    echo "  5. Upload to Netcup: scp backup.tar.gz netcup:/tmp/"
    echo "  6. Run: bash $0 /tmp/backup.tar.gz"
    exit 1
fi

BACKUP_FILE="$1"

if [ ! -f "$BACKUP_FILE" ]; then
    echo "ERROR: Backup file not found: $BACKUP_FILE"
    exit 1
fi

echo "=== Discourse Backup Restore ==="
echo "Backup file: $BACKUP_FILE"
echo ""

# Copy backup to Discourse backup directory
echo "[1/4] Copying backup to Discourse backup directory..."
mkdir -p "$BACKUP_DIR"
cp "$BACKUP_FILE" "$BACKUP_DIR/"
BACKUP_FILENAME=$(basename "$BACKUP_FILE")
echo "  Copied to $BACKUP_DIR/$BACKUP_FILENAME"

# Enable restore mode
echo ""
echo "[2/4] Enabling restore mode..."
cd "$DISCOURSE_DIR"
./launcher enter app <<EOF
discourse enable_restore
EOF

# Restore the backup
echo ""
echo "[3/4] Restoring backup (this may take several minutes)..."
./launcher enter app <<EOF
discourse restore $BACKUP_FILENAME
EOF

# Rebuild to ensure everything is clean
echo ""
echo "[4/4] Rebuilding container to finalize restore..."
./launcher rebuild app

# Reconnect to traefik network after rebuild
CONTAINER_ID=$(docker ps -q -f name=app)
if [ -n "$CONTAINER_ID" ]; then
    docker network connect traefik-public "$CONTAINER_ID" 2>/dev/null || true
fi

echo ""
echo "=== Restore Complete ==="
echo ""
echo "The forum should now contain all data from the backup."
echo "Visit https://cadcad-forum.jeffemmett.com to verify."
echo ""
echo "If switching to community.cadcad.org:"
echo "  1. Update DISCOURSE_HOSTNAME in containers/app.yml"
echo "  2. Update Traefik router rule in containers/app.yml"
echo "  3. ./launcher rebuild app"
echo "  4. Update Cloudflare tunnel + DNS"