using System.Collections.Concurrent;
using System.Reflection;
using Sbroenne.ExcelMcp.Core.Models.Actions;
namespace Sbroenne.ExcelMcp.CLI.Infrastructure;
internal static class ActionValidator
{
private static readonly ConcurrentDictionary<Type, IReadOnlyCollection<string>> ActionCache = new();
public static IReadOnlyCollection<string> GetValidActions<TEnum>() where TEnum : struct, Enum
{
return ActionCache.GetOrAdd(typeof(TEnum), BuildActionsForEnum);
}
public static bool TryNormalizeAction<TEnum>(string actionInput, out string normalizedAction, out string errorMessage)
where TEnum : struct, Enum
{
return TryNormalizeAction(actionInput, GetValidActions<TEnum>(), out normalizedAction, out errorMessage);
}
public static bool TryNormalizeAction(string actionInput, IEnumerable<string> validActions, out string normalizedAction, out string errorMessage)
{
normalizedAction = actionInput.Trim().ToLowerInvariant();
var validSet = validActions.ToHashSet(StringComparer.OrdinalIgnoreCase);
if (validSet.Contains(normalizedAction))
{
errorMessage = string.Empty;
return true;
}
errorMessage = $"Invalid action '{normalizedAction}'. Valid actions: {string.Join(", ", validSet.OrderBy(a => a, StringComparer.OrdinalIgnoreCase))}";
return false;
}
private static IReadOnlyCollection<string> BuildActionsForEnum(Type enumType)
{
var toActionString = typeof(ActionExtensions)
.GetMethods(BindingFlags.Public | BindingFlags.Static)
.FirstOrDefault(m => m.Name == "ToActionString" && m.GetParameters().Length == 1 && m.GetParameters()[0].ParameterType == enumType);
if (toActionString == null)
{
throw new InvalidOperationException($"Missing ToActionString() for enum {enumType.Name}");
}
var values = Enum.GetValues(enumType);
var results = new List<string>(values.Length);
foreach (var value in values)
{
var result = toActionString.Invoke(null, [value]) as string;
if (string.IsNullOrWhiteSpace(result))
{
throw new InvalidOperationException($"Action mapping missing for {enumType.Name}.{value}");
}
results.Add(result);
}
return results;
}
}
