Colorscape Love (#3326)

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API/Data/ManualMigrations/MigrateDuplicateDarkTheme.cs

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+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using API.Entities;
+using API.Services.Tasks.Scanner.Parser;
+using Kavita.Common.EnvironmentInfo;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+
+namespace API.Data.ManualMigrations;
+
+/// <summary>
+/// v0.8.0 ensured that MangaFile Path is normalized. This will normalize existing data to avoid churn.
+/// </summary>
+public static class MigrateDuplicateDarkTheme
+{
+    public static async Task Migrate(DataContext dataContext, ILogger<Program> logger)
+    {
+        if (await dataContext.ManualMigrationHistory.AnyAsync(m => m.Name == "MigrateDuplicateDarkTheme"))
+        {
+            return;
+        }
+
+        logger.LogCritical(
+            "Running MigrateDuplicateDarkTheme migration - Please be patient, this may take some time. This is not an error");
+
+        var darkThemes = await dataContext.SiteTheme.Where(t => t.Name == "Dark").ToListAsync();
+
+        if (darkThemes.Count > 1)
+        {
+            var correctDarkTheme = darkThemes.First(d => !string.IsNullOrEmpty(d.Description));
+
+            // Get users
+            var users = await dataContext.AppUser
+                .Include(u => u.UserPreferences)
+                .ThenInclude(p => p.Theme)
+                .Where(u => u.UserPreferences.Theme.Name == "Dark")
+                .ToListAsync();
+
+            // Find any users that have a duplicate Dark theme as default and switch to the correct one
+            foreach (var user in users)
+            {
+                if (string.IsNullOrEmpty(user.UserPreferences.Theme.Description))
+                {
+                    user.UserPreferences.Theme = correctDarkTheme;
+                }
+            }
+            await dataContext.SaveChangesAsync();
+
+            // Now remove the bad themes
+            dataContext.SiteTheme.RemoveRange(darkThemes.Where(d => string.IsNullOrEmpty(d.Description)));
+
+            await dataContext.SaveChangesAsync();
+        }
+
+        dataContext.ManualMigrationHistory.Add(new ManualMigrationHistory()
+        {
+            Name = "MigrateDuplicateDarkTheme",
+            ProductVersion = BuildInfo.Version.ToString(),
+            RanAt = DateTime.UtcNow
+        });
+        await dataContext.SaveChangesAsync();
+
+        logger.LogCritical(
+            "Running MigrateDuplicateDarkTheme migration - Completed. This is not an error");
+    }
+}