using System.Net;

namespace SimpleHttpServer.Types;

public abstract class InternalEndpointCheckAttribute : Attribute {
    /// <summary>
    /// Executed when the endpoint is invoked. The endpoint invocation is skipped if any of the checks fail.
    /// </summary>
    /// <returns>True to allow invocation, false to prevent.</returns>
    public abstract bool Check(HttpListenerRequest req);
    internal abstract void SetInstance(object? instance);
}

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, AllowMultiple = true)]
public abstract class BaseEndpointCheckAttribute<T> : InternalEndpointCheckAttribute {
    /// <summary>
    /// A reference to the instance of the class that this attribute is attached to. 
    /// Will be null iff an class factory was passed in <see cref="HttpServer.RegisterEndpointsFromType{T}(Func{T}?)"/>.
    /// </summary>
    protected internal T? EndpointClassInstance { get; internal set; } = default;
    public BaseEndpointCheckAttribute() { }
    internal override void SetInstance(object? instance) {
        if (instance != null)
            EndpointClassInstance = (T?) instance;
    }
}