namespace DealerSelection.Common.Helpers;

public class SwashbuckleSchemaHelper
{
    private readonly Dictionary<string, int> _schemaNameRepetition = new ();

    /// <summary>
    /// Eliminate the case where more than one method returns the same type in different controllers
    /// swagger documentation to fail
    /// </summary>
    /// <param name="modelType"></param>
    /// <returns></returns>
    public string GetSchemaId(Type modelType)
    {
        string id = DefaultSchemaIdSelector (modelType);

        if(!_schemaNameRepetition.ContainsKey(id))
            _schemaNameRepetition.Add(id, 0);

        int count = _schemaNameRepetition[id] + 1;
        _schemaNameRepetition[id] = count;

        return $"{id}{(count > 1 ? count.ToString() : "")}";
    }

    private string DefaultSchemaIdSelector(Type modelType)
    {
        if (!modelType.IsConstructedGenericType)
            return modelType.Name.Replace("[]", "Array");

        string prefix = modelType.GetGenericArguments()
            .Select(genericArg => DefaultSchemaIdSelector(genericArg))
            .Aggregate((previous, current) => previous + current);

        return prefix + modelType.Name.Split('`').First();
    }

}