namespace SimpleHttpServer.Types;

/// <summary>
/// Specifies the name of a http endpoint path parameter. Path parameter names must be in the format $1, $2, $3, ..., and the end of the path may be $*
/// </summary>
[AttributeUsage(AttributeTargets.Parameter, Inherited = false, AllowMultiple = false)]
public sealed class PathParameterAttribute : Attribute {
    public string Name { get; }
    public PathParameterAttribute(string name) {
        if (string.IsNullOrWhiteSpace(name)) {
            throw new ArgumentException($"'{nameof(name)}' cannot be null or whitespace.", nameof(name));
        }

        if (!name.StartsWith('$')) {
            throw new ArgumentException($"'{nameof(name)}' must start with $.", nameof(name));
        }

        if (name.Contains(' ')) {
            throw new ArgumentException($"'{nameof(name)}' must not contain spaces.", nameof(name));
        }

        Name = name;
    }
}