using System.Collections.Generic;
using System.Reflection;

namespace CommonTool
{
	public class MvcActionHelper
	{
		// ReSharper disable once StaticMemberInitializerReferesToMemberBelow
		public static MvcActionHelper Instance { get; } = new MvcActionHelper(AssemblyName);

		public MvcActionHelper(string assemblyName)
		{
			AssemblyName = assemblyName;
			ActionPermissions = GetAllActionByAssembly(assemblyName);
		}
		public static string AssemblyName { get; set; }
		public IList<ActionPermission> ActionPermissions { get; set; }

		public IList<ActionPermission> GetAllActionByAssembly(string assemblyName)
		{
			var result = new List<ActionPermission>();

			var types = Assembly.Load(assemblyName).GetTypes();

			foreach (var type in types)
			{
				if (type.BaseType != null && type.BaseType.Name == "BaseController")//如果是Controller
				{
					var members = type.GetMethods();
					foreach (var member in members)
					{
						if (member.ReturnType.Name == "ActionResult")//如果是Action
						{
							if (member.DeclaringType != null)
							{
								ActionPermission ap = new ActionPermission
								{
									ActionName = member.Name,
									ControllerName = member.DeclaringType.Name.Substring(0, member.DeclaringType.Name.Length - 10)
								};

								// 去掉“Controller”后缀

								object[] attrs = member.GetCustomAttributes(typeof(System.ComponentModel.DescriptionAttribute), true);
								if (attrs.Length > 0)
								{
									var descriptionAttribute = attrs[0] as System.ComponentModel.DescriptionAttribute;
									if (descriptionAttribute != null)
										ap.Description = descriptionAttribute.Description;
								}

								result.Add(ap);
							}
						}
					}
				}
			}
			return result;
		}

		/// <summary>
		/// 针对MVC的Action的权限
		/// </summary>
		public class ActionPermission
		{
			/// <summary>
			/// 请求地址
			/// </summary>
			public virtual string ActionName { get; set; }

			/// <summary>
			/// 请求地址
			/// </summary>
			public virtual string ControllerName { get; set; }

			/// <summary>
			/// 描述
			/// </summary>
			public virtual string Description { get; set; }

			///// <summary>
			///// 角色列表
			///// </summary>
			//public virtual ISet<Role> Roles { get; set; }
		}

	}
}