save channels table page size (#244)

* save channel table page size

* update changelog

CHANGELOG.md

@@ -7,6 +7,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Added
 - Support `(Part #)` name suffixes for multi-part episode grouping
 - Support multi-episode files in local libraries
+- Save Channels table page size
 
 ### Fixed
 - Fix search result crashes due to missing season metadata

ErsatzTV.Core/Domain/ConfigElementKey.cs

@@ -14,6 +14,7 @@
         public static ConfigElementKey FFmpegPreferredLanguageCode => new("ffmpeg.preferred_language_code");
         public static ConfigElementKey SearchIndexVersion => new("search_index.version");
         public static ConfigElementKey HDHRTunerCount => new("hdhr.tuner_count");
+        public static ConfigElementKey ChannelsPageSize => new("pages.channels.page_size");
         public static ConfigElementKey CollectionsPageSize => new("pages.collections.page_size");
         public static ConfigElementKey LibraryRefreshInterval => new("scanner.library_refresh_interval");
     }

ErsatzTV/Pages/Channels.razor

@@ -2,6 +2,8 @@
 @using ErsatzTV.Application.Channels
 @using ErsatzTV.Application.Channels.Commands
 @using ErsatzTV.Application.Channels.Queries
+@using ErsatzTV.Application.Configuration.Commands
+@using ErsatzTV.Application.Configuration.Queries
 @using ErsatzTV.Application.FFmpegProfiles
 @using ErsatzTV.Application.FFmpegProfiles.Queries
 @using System.Globalization
@@ -9,7 +11,10 @@
 @inject IMediator _mediator
 
 <MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
-    <MudTable Hover="true" Items="_channels">
+    <MudTable Hover="true"
+              @bind-RowsPerPage="@_rowsPerPage"
+              ServerData="@(new Func<TableState, Task<TableData<ChannelViewModel>>>(ServerReload))"
+              @ref="_table">
         <ToolBarContent>
             <MudText Typo="Typo.h6">Channels</MudText>
         </ToolBarContent>
@@ -77,13 +82,16 @@
 </MudContainer>
 
 @code {
-    private List<ChannelViewModel> _channels;
+    private MudTable<ChannelViewModel> _table;
     private List<FFmpegProfileViewModel> _ffmpegProfiles;
 
+    private int _rowsPerPage;
+
     protected override async Task OnParametersSetAsync()
     {
         _ffmpegProfiles = await _mediator.Send(new GetAllFFmpegProfiles());
-        await LoadChannelsAsync();
+        _rowsPerPage = await _mediator.Send(new GetConfigElementByKey(ConfigElementKey.ChannelsPageSize))
+            .Map(maybeRows => maybeRows.Match(ce => int.TryParse(ce.Value, out int rows) ? rows : 10, () => 10));
     }
 
     private async Task DeleteChannelAsync(ChannelViewModel channel)
@@ -96,17 +104,19 @@
         if (!result.Cancelled)
         {
             await _mediator.Send(new DeleteChannel(channel.Id));
-            await LoadChannelsAsync();
+            await _table.ReloadServerData();
         }
     }
 
-    private async Task LoadChannelsAsync()
+    private async Task<TableData<ChannelViewModel>> ServerReload(TableState state)
     {
+        await _mediator.Send(new SaveConfigElementByKey(ConfigElementKey.ChannelsPageSize, state.PageSize.ToString()));
+
         List<ChannelViewModel> channels = await _mediator.Send(new GetAllChannels());
         IOrderedEnumerable<ChannelViewModel> sorted = channels.OrderBy(c => decimal.Parse(c.Number));
 
         CultureInfo[] allCultures = CultureInfo.GetCultures(CultureTypes.NeutralCultures);
-        _channels = new List<ChannelViewModel>();
+        var processedChannels = new List<ChannelViewModel>();
         foreach (ChannelViewModel channel in sorted)
         {
             Option<CultureInfo> maybeCultureInfo = allCultures.Find(
@@ -116,9 +126,16 @@
                     StringComparison.OrdinalIgnoreCase));
 
             maybeCultureInfo.Match(
-                cultureInfo => _channels.Add(channel with { PreferredLanguageCode = cultureInfo.EnglishName }),
-                () => _channels.Add(channel));
+                cultureInfo => processedChannels.Add(channel with { PreferredLanguageCode = cultureInfo.EnglishName }),
+                () => processedChannels.Add(channel));
         }
+
+    // TODO: properly page this data
+        return new TableData<ChannelViewModel>
+        {
+            TotalItems = channels.Count,
+            Items = processedChannels.Skip(state.Page * state.PageSize).Take(state.PageSize)
+        };
     }
 
 }