using System;
using System.Reflection;
using Luticate2.Auth.Attributes;
using Luticate2.Auth.Interfaces.Permissions;
using Luticate2.Auth.Interfaces.Users;
using Luticate2.Utils.Controllers;
using Luticate2.Utils.Dbo.Result;
using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.Extensions.DependencyInjection;

namespace Luticate2.Auth.Middlewares
{
    public class LuPermissionMiddleware : IActionFilter
    {
        private readonly IServiceProvider _serviceProvider;
        private readonly ILuPermissionsBusiness _luPermissionsBusiness;

        public LuPermissionMiddleware(IServiceProvider serviceProvider, ILuPermissionsBusiness luPermissionsBusiness)
        {
            _serviceProvider = serviceProvider;
            _luPermissionsBusiness = luPermissionsBusiness;
        }

        public void OnActionExecuting(ActionExecutingContext context)
        {
            var actionDescriptor = context.ActionDescriptor as ControllerActionDescriptor;
            if (actionDescriptor != null)
            {
                var attributes = actionDescriptor.MethodInfo.GetCustomAttributes<LuPermissionAttribute>();
                foreach (var attribute in attributes)
                {
                    var srcAccessor = _serviceProvider.GetService(attribute.SrcEntityAccessor) as ILuAttrEntityAccessor;
                    var dstAccessor = _serviceProvider.GetService(attribute.DstEntityAccessor) as ILuAttrEntityAccessor;
                    var srcEntity = srcAccessor?.GetEntity(context, attribute.Id);
                    var dstEntity = dstAccessor?.GetEntity(context, attribute.Id);
                    var permissionValue = _luPermissionsBusiness.GetPermissionEffectiveValue(attribute.PermissionName,
                        attribute.SrcEntityType, srcEntity, attribute.DstEntityType, dstEntity).ThrowIfNotSuccess();
                    if (!permissionValue.Data)
                    {
                        var user = _serviceProvider.GetService<ILuLoggedUserAccessor>().GetLoggedUser();
                        LuResult<object>.Error(LuStatus.PermissionError,$"user: {user?.Id} {user?.Username}",
                            "Permission denied").Throw();
                    }
                }
            }
        }

        public void OnActionExecuted(ActionExecutedContext context)
        {
        }
    }
}