using System.Collections.Generic;

namespace ExcelKv.Core;

// --- Schema Middleware ---
public class SchemaRegistry
{
    private Dictionary<string, HashSet<string>> _knownSchemas = new();

    public void RegisterSchema(string namespaceKey, List<string> newColumns)
    {
        if (!_knownSchemas.ContainsKey(namespaceKey))
        {
            _knownSchemas[namespaceKey] = new HashSet<string>();
            foreach (var col in newColumns) _knownSchemas[namespaceKey].Add(col);
        }
        else
        {
            var existing = _knownSchemas[namespaceKey];
            foreach (var col in newColumns) if (!existing.Contains(col)) existing.Add(col);
        }
    }
}