Save the latest search on invoices

BTCPayServer/Controllers/InvoiceController.UI.cs

@@ -29,6 +29,7 @@ using Microsoft.EntityFrameworkCore;
 using NBitcoin;
 using NBitpayClient;
 using NBXplorer;
+using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using StoreData = BTCPayServer.Data.StoreData;
 
@@ -597,12 +598,40 @@ namespace BTCPayServer.Controllers
             return Ok("{}");
         }
 
+        public class InvoicePreference
+        {
+            public int? TimezoneOffset { get; set; }
+            public string SearchTerm { get; set; }
+        }
+
         [HttpGet]
         [Route("invoices")]
         [Authorize(AuthenticationSchemes = AuthenticationSchemes.Cookie)]
         [BitpayAPIConstraint(false)]
-        public async Task<IActionResult> ListInvoices(string searchTerm = null, int skip = 0, int count = 50, int timezoneOffset = 0)
+        public async Task<IActionResult> ListInvoices(string searchTerm = null, int skip = 0, int count = 50, int? timezoneOffset = null)
         {
+            // If the user enter an empty searchTerm, then the variable will be null and not empty string
+            // but we want searchTerm to be null only if the user is browsing the page via some link
+            // NOT if the user entered some empty search
+            searchTerm = searchTerm is string ? searchTerm :
+                         this.Request.Query.ContainsKey(nameof(searchTerm)) ? string.Empty :
+                         null;
+            if (searchTerm is null)
+            {
+                if (this.Request.Cookies.TryGetValue("ListInvoicePreferences", out var str))
+                {
+                    var preferences = JsonConvert.DeserializeObject<InvoicePreference>(str);
+                    searchTerm = preferences.SearchTerm;
+                    timezoneOffset = timezoneOffset is int v ? v : preferences.TimezoneOffset;
+                }
+            }
+            else
+            {
+                var preferences = new InvoicePreference();
+                preferences.SearchTerm = searchTerm;
+                preferences.TimezoneOffset = timezoneOffset;
+                this.Response.Cookies.Append("ListInvoicePreferences", JsonConvert.SerializeObject(preferences));
+            }
             var fs = new SearchString(searchTerm);
             var storeIds = fs.GetFilterArray("storeid") != null ? fs.GetFilterArray("storeid") : new List<string>().ToArray();
 
@@ -614,7 +643,7 @@ namespace BTCPayServer.Controllers
                 StoreIds = storeIds,
                 TimezoneOffset = timezoneOffset
             };
-            InvoiceQuery invoiceQuery = GetInvoiceQuery(searchTerm, timezoneOffset);
+            InvoiceQuery invoiceQuery = GetInvoiceQuery(searchTerm, timezoneOffset ?? 0);
             var counting = _InvoiceRepository.GetInvoicesTotal(invoiceQuery);
             invoiceQuery.Count = count;
             invoiceQuery.Skip = skip;

BTCPayServer/Views/Invoice/ListInvoices.cshtml

@@ -1,4 +1,4 @@
-@model InvoicesModel
+@model InvoicesModel
 @{
     ViewData["Title"] = "Invoices";
 }