docs: #302 UI for transfering a category

GanjooRazor/Areas/Admin/Pages/CatTrans.cshtml

@@ -0,0 +1,39 @@
+@page
+@model GanjooRazor.Areas.Admin.Pages.CatTransModel
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
+@{
+    Layout = "_AdminLayout";
+    ViewData["Title"] = "انتقال بخش";
+}
+
+<h1>@ViewData["Title"]</h1>
+
+@if (!string.IsNullOrEmpty(Model.LastMessage))
+{
+    @Html.Raw(Model.LastMessage)
+}
+else
+{
+    <table>
+        <tr>
+            <th>مبدأ</th>
+            <th>مقصد</th>
+        </tr>
+
+        @foreach (var poem in Model.Poems)
+       {
+           <tr>
+               <td>
+                   <a href="@poem.SrcPoemFullUrl">@poem.SrcPoemFullTitle</a>
+               </td>
+               <td>
+                   @if(!string.IsNullOrEmpty(poem.DestPoemFullUrl))
+                    {
+                        <a href="@poem.DestPoemFullUrl">@poem.DestPoemFullTitle</a>
+                    }
+                </td>
+           </tr>
+       }
+    </table>
+}
+

GanjooRazor/Areas/Admin/Pages/CatTrans.cshtml.cs

@@ -0,0 +1,71 @@
+using System.IO;
+using System.Net.Http;
+using System.Text;
+using System.Threading.Tasks;
+using GanjooRazor.Utils;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.Extensions.Caching.Memory;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using RMuseum.Models.Ganjoor;
+using RMuseum.Models.Ganjoor.ViewModels;
+
+namespace GanjooRazor.Areas.Admin.Pages
+{
+    [IgnoreAntiforgeryToken(Order = 1001)]
+    public class CatTransModel : PageModel
+    {
+        /// <summary>
+        /// last message
+        /// </summary>
+        public string LastMessage { get; set; }
+
+        /// <summary>
+        /// poems
+        /// </summary>
+        public GanjoorDuplicateViewModel[] Poems { get; set; }
+
+        private async Task<bool> _GetCatDuplicatesAsync()
+        {
+            if (string.IsNullOrEmpty(Request.Query["id"]))
+            {
+                LastMessage = "شناسهٔ بخش مشخص نیست.";
+                return false;
+            }
+            var id = Request.Query["id"];
+            using (HttpClient secureClient = new HttpClient())
+            {
+                if(await GanjoorSessionChecker.PrepareClient(secureClient, Request, Response))
+                {
+                    HttpResponseMessage response = await secureClient.GetAsync($"{APIRoot.Url}/api/ganjoor/duplicates/{id}");
+                    if (!response.IsSuccessStatusCode)
+                    {
+                        LastMessage = JsonConvert.DeserializeObject<string>(await response.Content.ReadAsStringAsync());
+                        return false;
+                    }
+                    else
+                    {
+                        Poems = JsonConvert.DeserializeObject<GanjoorDuplicateViewModel[]>(await response.Content.ReadAsStringAsync());
+                    }
+                }
+                else
+                {
+                    LastMessage = "لطفا از گنجور خارج و مجددا به آن وارد شوید.";
+                    return false;
+                }
+            }
+            return true;
+        }
+        public async Task<IActionResult> OnGetAsync()
+        {
+            if (string.IsNullOrEmpty(Request.Cookies["Token"]))
+                return Redirect("/");
+
+            await _GetCatDuplicatesAsync();
+
+            return Page();
+        }
+    }
+}

GanjooRazor/Areas/Admin/Pages/CatUtils.cshtml

@@ -505,6 +505,8 @@
     </tr>
 </table>
 
+<p><a href="/Admin/CatTrans?id=@Model.Cat.Cat.Id">انتقال بخش</a></p>
+