using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.ActionConstraints;
using Microsoft.AspNetCore.Mvc.ApplicationModels;
using Microsoft.AspNetCore.Routing;

namespace MAX.Framework.Conventions;

/// <summary>
/// 控制器内未声明 HTTP 方法的操作默认只接受 GET，供各模块复用。
/// 显式 HTTP 方法声明优先；同时补充路由约束和端点元数据，保证接口文档一致。
/// </summary>
[AttributeUsage(AttributeTargets.Class, Inherited = true)]
public sealed class DefaultHttpGetAttribute : Attribute, IControllerModelConvention
{
    public void Apply(ControllerModel controller)
    {
        foreach (var action in controller.Actions)
        foreach (var selector in action.Selectors)
        {
            if (selector.ActionConstraints.OfType<HttpMethodActionConstraint>().Any()
                || selector.EndpointMetadata.OfType<IHttpMethodMetadata>().Any())
                continue;

            selector.ActionConstraints.Add(new HttpMethodActionConstraint([HttpMethods.Get]));
            selector.EndpointMetadata.Add(new HttpMethodMetadata([HttpMethods.Get]));
        }
    }
}