#!/bin/bash
# AOS Restore Script (PRD §5.7: restore drill)
# Usage: ./deploy/restore.sh <backup_file>
# Restores SQLite from a backup file, verifies SHA-256 checksum.
set -eu

BACKUP_FILE="${1:-}"
DB_PATH="${DATABASE_URL:-file:/home/z/my-project/db/custom.db}"
DB_FILE="${DB_PATH#file:}"

if [ -z "$BACKUP_FILE" ]; then
    echo "Usage: $0 <backup_file>"
    echo ""
    echo "Available backups:"
    ls -lh /home/z/my-project/db/backups/aos_*.db 2>/dev/null || echo "  (none)"
    exit 1
fi

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

echo "=== AOS Restore ==="
echo "  Backup: $BACKUP_FILE"
echo "  Target: $DB_FILE"

# Verify checksum if .sha256 exists
SHA_FILE="${BACKUP_FILE}.sha256"
if [ -f "$SHA_FILE" ]; then
    echo ""
    echo "=== Verifying SHA-256 checksum ==="
    if sha256sum -c "$SHA_FILE" --quiet 2>/dev/null; then
        echo "  ✓ Checksum verified"
    else
        echo "  ✗ Checksum FAILED — file may be corrupted"
        read -p "  Continue anyway? (y/N) " -n 1 -r
        echo
        [[ ! $REPLY =~ ^[Yy]$ ]] && exit 1
    fi
fi

# Stop app if running
echo ""
echo "=== Stopping app... ==="
pkill -f "next dev" 2>/dev/null || true
pkill -f "node server.js" 2>/dev/null || true
sleep 2

# Backup current DB
if [ -f "$DB_FILE" ]; then
    CURRENT_BACKUP="${DB_FILE}.pre-restore.$(date +%Y%m%d_%H%M%S)"
    echo "=== Backing up current DB to $CURRENT_BACKUP ==="
    cp "$DB_FILE" "$CURRENT_BACKUP"
fi

# Restore
echo ""
echo "=== Restoring... ==="
cp "$BACKUP_FILE" "$DB_FILE"
echo "  ✓ Database restored"

# Verify
echo ""
echo "=== Verification ==="
if [ -f "$DB_FILE" ]; then
    SIZE=$(wc -c < "$DB_FILE")
    echo "  File size: $SIZE bytes"
    echo "  ✓ Restore complete. Run 'bun run dev' to start."
else
    echo "  ✗ ERROR: DB file not found after restore"
    exit 1
fi