refactor: organize services by provider and standardize settings pattern

octo-fiesta.Tests/DeezerDownloadServiceTests.cs

@@ -1,4 +1,6 @@
 using octo_fiesta.Services;
+using octo_fiesta.Services.Deezer;
+using octo_fiesta.Services.Local;
 using octo_fiesta.Models;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Logging;
@@ -68,6 +70,13 @@ public class DeezerDownloadServiceTests : IDisposable
         { 
             DownloadMode = downloadMode 
         });
+        
+        var deezerSettings = Options.Create(new DeezerSettings
+        {
+            Arl = arl,
+            ArlFallback = null,
+            Quality = null
+        });
 
         return new DeezerDownloadService(
             _httpClientFactoryMock.Object,
@@ -75,6 +84,7 @@ public class DeezerDownloadServiceTests : IDisposable
             _localLibraryServiceMock.Object,
             _metadataServiceMock.Object,
             subsonicSettings,
+            deezerSettings,
             _loggerMock.Object);
     }
 

octo-fiesta.Tests/DeezerMetadataServiceTests.cs

@@ -1,4 +1,4 @@
-using octo_fiesta.Services;
+using octo_fiesta.Services.Deezer;
 using octo_fiesta.Models;
 using Moq;
 using Moq.Protected;

octo-fiesta.Tests/LocalLibraryServiceTests.cs

@@ -1,4 +1,4 @@
-using octo_fiesta.Services;
+using octo_fiesta.Services.Local;
 using octo_fiesta.Models;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Logging;

octo-fiesta/Controllers/SubSonicController.cs

@@ -5,6 +5,7 @@ using System.Text.Json;
 using Microsoft.Extensions.Options;
 using octo_fiesta.Models;
 using octo_fiesta.Services;
+using octo_fiesta.Services.Local;
 
 namespace octo_fiesta.Controllers;
 

octo-fiesta/Models/DeezerSettings.cs

@@ -0,0 +1,25 @@
+namespace octo_fiesta.Models;
+
+/// <summary>
+/// Configuration for the Deezer downloader and metadata service
+/// </summary>
+public class DeezerSettings
+{
+    /// <summary>
+    /// Deezer ARL token (required for downloading)
+    /// Obtained from browser cookies after logging into deezer.com
+    /// </summary>
+    public string? Arl { get; set; }
+    
+    /// <summary>
+    /// Fallback ARL token (optional)
+    /// Used if the primary ARL token fails
+    /// </summary>
+    public string? ArlFallback { get; set; }
+    
+    /// <summary>
+    /// Preferred audio quality: FLAC, MP3_320, MP3_128
+    /// If not specified or unavailable, the highest available quality will be used.
+    /// </summary>
+    public string? Quality { get; set; }
+}

octo-fiesta/Program.cs

@@ -1,5 +1,8 @@
 using octo_fiesta.Models;
 using octo_fiesta.Services;
+using octo_fiesta.Services.Deezer;
+using octo_fiesta.Services.Qobuz;
+using octo_fiesta.Services.Local;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -13,6 +16,8 @@ builder.Services.AddSwaggerGen();
 // Configuration
 builder.Services.Configure<SubsonicSettings>(
     builder.Configuration.GetSection("Subsonic"));
+builder.Services.Configure<DeezerSettings>(
+    builder.Configuration.GetSection("Deezer"));
 builder.Services.Configure<QobuzSettings>(
     builder.Configuration.GetSection("Qobuz"));
 

octo-fiesta/Services/Deezer/DeezerDownloadService.cs

@@ -5,26 +5,13 @@ using Org.BouncyCastle.Crypto.Engines;
 using Org.BouncyCastle.Crypto.Modes;
 using Org.BouncyCastle.Crypto.Parameters;
 using octo_fiesta.Models;
+using octo_fiesta.Services;
+using octo_fiesta.Services.Local;
 using Microsoft.Extensions.Options;
 using TagLib;
 using IOFile = System.IO.File;
 
-namespace octo_fiesta.Services;
+namespace octo_fiesta.Services.Deezer;
-
-/// <summary>
-/// Configuration for the Deezer downloader
-/// </summary>
-public class DeezerDownloaderSettings
-{
-    public string? Arl { get; set; }
-    public string? ArlFallback { get; set; }
-    public string DownloadPath { get; set; } = "./downloads";
-    /// <summary>
-    /// Preferred audio quality: FLAC, MP3_320, MP3_128
-    /// If not specified or unavailable, the highest available quality will be used.
-    /// </summary>
-    public string? Quality { get; set; }
-}
 
 /// <summary>
 /// C# port of the DeezerDownloader JavaScript
@@ -66,6 +53,7 @@ public class DeezerDownloadService : IDownloadService
         ILocalLibraryService localLibraryService,
         IMusicMetadataService metadataService,
         IOptions<SubsonicSettings> subsonicSettings,
+        IOptions<DeezerSettings> deezerSettings,
         ILogger<DeezerDownloadService> logger)
     {
         _httpClient = httpClientFactory.CreateClient();
@@ -75,10 +63,11 @@ public class DeezerDownloadService : IDownloadService
         _subsonicSettings = subsonicSettings.Value;
         _logger = logger;
         
+        var deezer = deezerSettings.Value;
         _downloadPath = configuration["Library:DownloadPath"] ?? "./downloads";
-        _arl = configuration["Deezer:Arl"];
+        _arl = deezer.Arl;
-        _arlFallback = configuration["Deezer:ArlFallback"];
+        _arlFallback = deezer.ArlFallback;
-        _preferredQuality = configuration["Deezer:Quality"];
+        _preferredQuality = deezer.Quality;
         
         if (!Directory.Exists(_downloadPath))
         {

octo-fiesta/Services/Deezer/DeezerMetadataService.cs

@@ -2,7 +2,7 @@ using octo_fiesta.Models;
 using System.Text.Json;
 using Microsoft.Extensions.Options;
 
-namespace octo_fiesta.Services;
+namespace octo_fiesta.Services.Deezer;
 
 /// <summary>
 /// Metadata service implementation using the Deezer API (free, no key required)

octo-fiesta/Services/Deezer/DeezerStartupValidator.cs

@@ -0,0 +1,186 @@
+using System.Text;
+using System.Text.Json;
+using Microsoft.Extensions.Options;
+using octo_fiesta.Models;
+
+namespace octo_fiesta.Services.Deezer;
+
+/// <summary>
+/// Validates Deezer ARL credentials at startup
+/// </summary>
+public class DeezerStartupValidator
+{
+    private readonly DeezerSettings _settings;
+    private readonly HttpClient _httpClient;
+
+    public DeezerStartupValidator(IOptions<DeezerSettings> settings, HttpClient httpClient)
+    {
+        _settings = settings.Value;
+        _httpClient = httpClient;
+    }
+
+    public async Task ValidateAsync(CancellationToken cancellationToken)
+    {
+        var arl = _settings.Arl;
+        var arlFallback = _settings.ArlFallback;
+        var quality = _settings.Quality;
+
+        Console.WriteLine();
+
+        if (string.IsNullOrWhiteSpace(arl))
+        {
+            WriteStatus("Deezer ARL", "NOT CONFIGURED", ConsoleColor.Red);
+            WriteDetail("Set the Deezer__Arl environment variable");
+            return;
+        }
+
+        WriteStatus("Deezer ARL", MaskSecret(arl), ConsoleColor.Cyan);
+        
+        if (!string.IsNullOrWhiteSpace(arlFallback))
+        {
+            WriteStatus("Deezer ARL Fallback", MaskSecret(arlFallback), ConsoleColor.Cyan);
+        }
+
+        WriteStatus("Deezer Quality", string.IsNullOrWhiteSpace(quality) ? "auto (highest available)" : quality, ConsoleColor.Cyan);
+
+        // Validate ARL by calling Deezer API
+        await ValidateArlTokenAsync(arl, "primary", cancellationToken);
+        
+        if (!string.IsNullOrWhiteSpace(arlFallback))
+        {
+            await ValidateArlTokenAsync(arlFallback, "fallback", cancellationToken);
+        }
+    }
+
+    private async Task ValidateArlTokenAsync(string arl, string label, CancellationToken cancellationToken)
+    {
+        var fieldName = $"Deezer ARL ({label})";
+        
+        try
+        {
+            using var request = new HttpRequestMessage(HttpMethod.Post,
+                "https://www.deezer.com/ajax/gw-light.php?method=deezer.getUserData&input=3&api_version=1.0&api_token=null");
+            
+            request.Headers.Add("Cookie", $"arl={arl}");
+            request.Content = new StringContent("{}", Encoding.UTF8, "application/json");
+
+            var response = await _httpClient.SendAsync(request, cancellationToken);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                WriteStatus(fieldName, $"HTTP {(int)response.StatusCode}", ConsoleColor.Red);
+                return;
+            }
+
+            var json = await response.Content.ReadAsStringAsync(cancellationToken);
+            var doc = JsonDocument.Parse(json);
+
+            if (doc.RootElement.TryGetProperty("results", out var results) &&
+                results.TryGetProperty("USER", out var user))
+            {
+                if (user.TryGetProperty("USER_ID", out var userId))
+                {
+                    var userIdValue = userId.ValueKind == JsonValueKind.Number 
+                        ? userId.GetInt64() 
+                        : long.TryParse(userId.GetString(), out var parsed) ? parsed : 0;
+
+                    if (userIdValue > 0)
+                    {
+                        // BLOG_NAME is the username displayed on Deezer
+                        var userName = user.TryGetProperty("BLOG_NAME", out var blogName) && blogName.GetString() is string bn && !string.IsNullOrEmpty(bn)
+                            ? bn
+                            : user.TryGetProperty("NAME", out var name) && name.GetString() is string n && !string.IsNullOrEmpty(n)
+                                ? n
+                                : "Unknown";
+                        
+                        var offerName = GetOfferName(user);
+                        
+                        WriteStatus(fieldName, "VALID", ConsoleColor.Green);
+                        WriteDetail($"Logged in as {userName} ({offerName})");
+                        return;
+                    }
+                }
+                
+                WriteStatus(fieldName, "INVALID", ConsoleColor.Red);
+                WriteDetail("Token is expired or invalid");
+            }
+            else
+            {
+                WriteStatus(fieldName, "INVALID", ConsoleColor.Red);
+                WriteDetail("Unexpected response from Deezer");
+            }
+        }
+        catch (TaskCanceledException)
+        {
+            WriteStatus(fieldName, "TIMEOUT", ConsoleColor.Yellow);
+            WriteDetail("Could not reach Deezer within 10 seconds");
+        }
+        catch (HttpRequestException ex)
+        {
+            WriteStatus(fieldName, "UNREACHABLE", ConsoleColor.Yellow);
+            WriteDetail(ex.Message);
+        }
+        catch (Exception ex)
+        {
+            WriteStatus(fieldName, "ERROR", ConsoleColor.Red);
+            WriteDetail(ex.Message);
+        }
+    }
+
+    private static string GetOfferName(JsonElement user)
+    {
+        if (!user.TryGetProperty("OPTIONS", out var options))
+        {
+            return "Free";
+        }
+
+        // Check actual streaming capabilities, not just license_token presence
+        var hasLossless = options.TryGetProperty("web_lossless", out var webLossless) && webLossless.GetBoolean();
+        var hasHq = options.TryGetProperty("web_hq", out var webHq) && webHq.GetBoolean();
+
+        if (hasLossless)
+        {
+            return "Premium+ (Lossless)";
+        }
+        
+        if (hasHq)
+        {
+            return "Premium (HQ)";
+        }
+        
+        return "Free";
+    }
+
+    private static void WriteStatus(string label, string value, ConsoleColor valueColor)
+    {
+        Console.Write($"  {label}: ");
+        var originalColor = Console.ForegroundColor;
+        Console.ForegroundColor = valueColor;
+        Console.WriteLine(value);
+        Console.ForegroundColor = originalColor;
+    }
+
+    private static void WriteDetail(string message)
+    {
+        var originalColor = Console.ForegroundColor;
+        Console.ForegroundColor = ConsoleColor.DarkGray;
+        Console.WriteLine($"    -> {message}");
+        Console.ForegroundColor = originalColor;
+    }
+
+    private static string MaskSecret(string secret)
+    {
+        if (string.IsNullOrEmpty(secret))
+        {
+            return "(empty)";
+        }
+
+        const int visibleChars = 4;
+        if (secret.Length <= visibleChars)
+        {
+            return new string('*', secret.Length);
+        }
+
+        return secret[..visibleChars] + new string('*', Math.Min(secret.Length - visibleChars, 8));
+    }
+}

octo-fiesta/Services/Local/ILocalLibraryService.cs

@@ -0,0 +1,46 @@
+using octo_fiesta.Models;
+
+namespace octo_fiesta.Services.Local;
+
+/// <summary>
+/// Interface for local music library management
+/// </summary>
+public interface ILocalLibraryService
+{
+    /// <summary>
+    /// Checks if an external song already exists locally
+    /// </summary>
+    Task<string?> GetLocalPathForExternalSongAsync(string externalProvider, string externalId);
+    
+    /// <summary>
+    /// Registers a downloaded song in the local library
+    /// </summary>
+    Task RegisterDownloadedSongAsync(Song song, string localPath);
+    
+    /// <summary>
+    /// Gets the mapping between external ID and local ID
+    /// </summary>
+    Task<string?> GetLocalIdForExternalSongAsync(string externalProvider, string externalId);
+    
+    /// <summary>
+    /// Parses a song ID to determine if it is external or local
+    /// </summary>
+    (bool isExternal, string? provider, string? externalId) ParseSongId(string songId);
+    
+    /// <summary>
+    /// Parses an external ID to extract the provider, type and ID
+    /// Format: ext-{provider}-{type}-{id} (e.g., ext-deezer-artist-259, ext-deezer-album-96126, ext-deezer-song-12345)
+    /// Also supports legacy format: ext-{provider}-{id} (assumes song type)
+    /// </summary>
+    (bool isExternal, string? provider, string? type, string? externalId) ParseExternalId(string id);
+    
+    /// <summary>
+    /// Triggers a Subsonic library scan
+    /// </summary>
+    Task<bool> TriggerLibraryScanAsync();
+    
+    /// <summary>
+    /// Gets the current scan status
+    /// </summary>
+    Task<ScanStatus?> GetScanStatusAsync();
+}

octo-fiesta/Services/Local/LocalLibraryService.cs

@@ -1,58 +1,15 @@
-using System.Text.Json;
+using System.Text.Json;
-using System.Xml.Linq;
+using Microsoft.Extensions.Options;
-using Microsoft.Extensions.Options;
+using octo_fiesta.Models;
-using octo_fiesta.Models;
+using octo_fiesta.Services;
-
+
-namespace octo_fiesta.Services;
+namespace octo_fiesta.Services.Local;
-
+
-/// <summary>
+/// <summary>
-/// Interface for local music library management
+/// Local library service implementation
-/// </summary>
+/// Uses a simple JSON file to store mappings (can be replaced with a database)
-public interface ILocalLibraryService
+/// </summary>
-{
+public class LocalLibraryService : ILocalLibraryService
-    /// <summary>
-    /// Checks if an external song already exists locally
-    /// </summary>
-    Task<string?> GetLocalPathForExternalSongAsync(string externalProvider, string externalId);
-    
-    /// <summary>
-    /// Registers a downloaded song in the local library
-    /// </summary>
-    Task RegisterDownloadedSongAsync(Song song, string localPath);
-    
-    /// <summary>
-    /// Gets the mapping between external ID and local ID
-    /// </summary>
-    Task<string?> GetLocalIdForExternalSongAsync(string externalProvider, string externalId);
-    
-    /// <summary>
-    /// Parses a song ID to determine if it is external or local
-    /// </summary>
-    (bool isExternal, string? provider, string? externalId) ParseSongId(string songId);
-    
-    /// <summary>
-    /// Parses an external ID to extract the provider, type and ID
-    /// Format: ext-{provider}-{type}-{id} (e.g., ext-deezer-artist-259, ext-deezer-album-96126, ext-deezer-song-12345)
-    /// Also supports legacy format: ext-{provider}-{id} (assumes song type)
-    /// </summary>
-    (bool isExternal, string? provider, string? type, string? externalId) ParseExternalId(string id);
-    
-    /// <summary>
-    /// Triggers a Subsonic library scan
-    /// </summary>
-    Task<bool> TriggerLibraryScanAsync();
-    
-    /// <summary>
-    /// Gets the current scan status
-    /// </summary>
-    Task<ScanStatus?> GetScanStatusAsync();
-}
-
-/// <summary>
-/// Local library service implementation
-/// Uses a simple JSON file to store mappings (can be replaced with a database)
-/// </summary>
-public class LocalLibraryService : ILocalLibraryService
 {
     private readonly string _mappingFilePath;
     private readonly string _downloadDirectory;

octo-fiesta/Services/Qobuz/QobuzBundleService.cs

@@ -1,6 +1,6 @@
 using System.Text.RegularExpressions;
 
-namespace octo_fiesta.Services;
+namespace octo_fiesta.Services.Qobuz;
 
 /// <summary>
 /// Service to dynamically extract Qobuz App ID and secrets from the Qobuz web player

octo-fiesta/Services/Qobuz/QobuzDownloadService.cs

@@ -2,10 +2,13 @@ using System.Security.Cryptography;
 using System.Text;
 using System.Text.Json;
 using octo_fiesta.Models;
+using octo_fiesta.Services;
+using octo_fiesta.Services.Deezer;
+using octo_fiesta.Services.Local;
 using Microsoft.Extensions.Options;
 using IOFile = System.IO.File;
 
-namespace octo_fiesta.Services;
+namespace octo_fiesta.Services.Qobuz;
 
 /// <summary>
 /// Download service implementation for Qobuz

octo-fiesta/Services/Qobuz/QobuzMetadataService.cs

@@ -2,7 +2,7 @@ using octo_fiesta.Models;
 using System.Text.Json;
 using Microsoft.Extensions.Options;
 
-namespace octo_fiesta.Services;
+namespace octo_fiesta.Services.Qobuz;
 
 /// <summary>
 /// Metadata service implementation using the Qobuz API

octo-fiesta/Services/Qobuz/QobuzStartupValidator.cs

@@ -0,0 +1,158 @@
+using Microsoft.Extensions.Options;
+using octo_fiesta.Models;
+
+namespace octo_fiesta.Services.Qobuz;
+
+/// <summary>
+/// Validates Qobuz credentials at startup
+/// </summary>
+public class QobuzStartupValidator
+{
+    private readonly IOptions<QobuzSettings> _qobuzSettings;
+    private readonly HttpClient _httpClient;
+
+    public QobuzStartupValidator(IOptions<QobuzSettings> qobuzSettings, HttpClient httpClient)
+    {
+        _qobuzSettings = qobuzSettings;
+        _httpClient = httpClient;
+    }
+
+    public async Task ValidateAsync(CancellationToken cancellationToken)
+    {
+        var userAuthToken = _qobuzSettings.Value.UserAuthToken;
+        var userId = _qobuzSettings.Value.UserId;
+        var quality = _qobuzSettings.Value.Quality;
+
+        Console.WriteLine();
+
+        if (string.IsNullOrWhiteSpace(userAuthToken))
+        {
+            WriteStatus("Qobuz UserAuthToken", "NOT CONFIGURED", ConsoleColor.Red);
+            WriteDetail("Set the Qobuz__UserAuthToken environment variable");
+            return;
+        }
+
+        if (string.IsNullOrWhiteSpace(userId))
+        {
+            WriteStatus("Qobuz UserId", "NOT CONFIGURED", ConsoleColor.Red);
+            WriteDetail("Set the Qobuz__UserId environment variable");
+            return;
+        }
+
+        WriteStatus("Qobuz UserAuthToken", MaskSecret(userAuthToken), ConsoleColor.Cyan);
+        WriteStatus("Qobuz UserId", userId, ConsoleColor.Cyan);
+        WriteStatus("Qobuz Quality", quality ?? "auto (highest available)", ConsoleColor.Cyan);
+
+        // Validate token by calling Qobuz API
+        await ValidateQobuzTokenAsync(userAuthToken, userId, cancellationToken);
+    }
+
+    private async Task ValidateQobuzTokenAsync(string userAuthToken, string userId, CancellationToken cancellationToken)
+    {
+        const string fieldName = "Qobuz credentials";
+        
+        try
+        {
+            // First, get the app ID from bundle service (simple check)
+            var bundleUrl = "https://play.qobuz.com/login";
+            var bundleResponse = await _httpClient.GetAsync(bundleUrl, cancellationToken);
+            
+            if (!bundleResponse.IsSuccessStatusCode)
+            {
+                WriteStatus(fieldName, "UNABLE TO VERIFY", ConsoleColor.Yellow);
+                WriteDetail("Could not fetch Qobuz app configuration");
+                return;
+            }
+
+            // Try to validate with a simple API call
+            // We'll use the user favorites endpoint which requires authentication
+            var appId = "798273057"; // Fallback app ID
+            var apiUrl = $"https://www.qobuz.com/api.json/0.2/favorite/getUserFavorites?user_id={userId}&app_id={appId}";
+            
+            using var request = new HttpRequestMessage(HttpMethod.Get, apiUrl);
+            request.Headers.Add("X-App-Id", appId);
+            request.Headers.Add("X-User-Auth-Token", userAuthToken);
+            request.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:83.0) Gecko/20100101 Firefox/83.0");
+
+            var response = await _httpClient.SendAsync(request, cancellationToken);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                // 401 means invalid token, other errors might be network issues
+                if (response.StatusCode == System.Net.HttpStatusCode.Unauthorized)
+                {
+                    WriteStatus(fieldName, "INVALID", ConsoleColor.Red);
+                    WriteDetail("Token is expired or invalid");
+                }
+                else
+                {
+                    WriteStatus(fieldName, $"HTTP {(int)response.StatusCode}", ConsoleColor.Yellow);
+                    WriteDetail("Unable to verify credentials");
+                }
+                return;
+            }
+
+            var json = await response.Content.ReadAsStringAsync(cancellationToken);
+            
+            // If we got a successful response, credentials are valid
+            if (!string.IsNullOrEmpty(json) && !json.Contains("\"error\""))
+            {
+                WriteStatus(fieldName, "VALID", ConsoleColor.Green);
+                WriteDetail($"User ID: {userId}");
+            }
+            else
+            {
+                WriteStatus(fieldName, "INVALID", ConsoleColor.Red);
+                WriteDetail("Unexpected response from Qobuz");
+            }
+        }
+        catch (TaskCanceledException)
+        {
+            WriteStatus(fieldName, "TIMEOUT", ConsoleColor.Yellow);
+            WriteDetail("Could not reach Qobuz within 10 seconds");
+        }
+        catch (HttpRequestException ex)
+        {
+            WriteStatus(fieldName, "UNREACHABLE", ConsoleColor.Yellow);
+            WriteDetail(ex.Message);
+        }
+        catch (Exception ex)
+        {
+            WriteStatus(fieldName, "ERROR", ConsoleColor.Red);
+            WriteDetail(ex.Message);
+        }
+    }
+
+    private static void WriteStatus(string label, string value, ConsoleColor valueColor)
+    {
+        Console.Write($"  {label}: ");
+        var originalColor = Console.ForegroundColor;
+        Console.ForegroundColor = valueColor;
+        Console.WriteLine(value);
+        Console.ForegroundColor = originalColor;
+    }
+
+    private static void WriteDetail(string message)
+    {
+        var originalColor = Console.ForegroundColor;
+        Console.ForegroundColor = ConsoleColor.DarkGray;
+        Console.WriteLine($"    -> {message}");
+        Console.ForegroundColor = originalColor;
+    }
+
+    private static string MaskSecret(string secret)
+    {
+        if (string.IsNullOrEmpty(secret))
+        {
+            return "(empty)";
+        }
+
+        const int visibleChars = 4;
+        if (secret.Length <= visibleChars)
+        {
+            return new string('*', secret.Length);
+        }
+
+        return secret[..visibleChars] + new string('*', Math.Min(secret.Length - visibleChars, 8));
+    }
+}

octo-fiesta/Services/StartupValidationService.cs

@@ -1,7 +1,7 @@
-using System.Text;
-using System.Text.Json;
 using Microsoft.Extensions.Options;
 using octo_fiesta.Models;
+using octo_fiesta.Services.Deezer;
+using octo_fiesta.Services.Qobuz;
 
 namespace octo_fiesta.Services;
 
@@ -14,16 +14,19 @@ public class StartupValidationService : IHostedService
 {
     private readonly IConfiguration _configuration;
     private readonly IOptions<SubsonicSettings> _subsonicSettings;
+    private readonly IOptions<DeezerSettings> _deezerSettings;
     private readonly IOptions<QobuzSettings> _qobuzSettings;
     private readonly HttpClient _httpClient;
 
     public StartupValidationService(
         IConfiguration configuration,
         IOptions<SubsonicSettings> subsonicSettings,
+        IOptions<DeezerSettings> deezerSettings,
         IOptions<QobuzSettings> qobuzSettings)
     {
         _configuration = configuration;
         _subsonicSettings = subsonicSettings;
+        _deezerSettings = deezerSettings;
         _qobuzSettings = qobuzSettings;
         // Create a dedicated HttpClient without logging to keep startup output clean
         _httpClient = new HttpClient { Timeout = TimeSpan.FromSeconds(10) };
@@ -43,11 +46,13 @@ public class StartupValidationService : IHostedService
         var musicService = _subsonicSettings.Value.MusicService;
         if (musicService == MusicService.Qobuz)
         {
-            await ValidateQobuzAsync(cancellationToken);
+            var qobuzValidator = new QobuzStartupValidator(_qobuzSettings, _httpClient);
+            await qobuzValidator.ValidateAsync(cancellationToken);
         }
         else
         {
-            await ValidateDeezerArlAsync(cancellationToken);
+            var deezerValidator = new DeezerStartupValidator(_deezerSettings, _httpClient);
+            await deezerValidator.ValidateAsync(cancellationToken);
         }
 
         Console.WriteLine();
@@ -121,244 +126,6 @@ public class StartupValidationService : IHostedService
         }
     }
 
-    private async Task ValidateDeezerArlAsync(CancellationToken cancellationToken)
-    {
-        var arl = _configuration["Deezer:Arl"];
-        var arlFallback = _configuration["Deezer:ArlFallback"];
-        var quality = _configuration["Deezer:Quality"];
-
-        Console.WriteLine();
-
-        if (string.IsNullOrWhiteSpace(arl))
-        {
-            WriteStatus("Deezer ARL", "NOT CONFIGURED", ConsoleColor.Red);
-            WriteDetail("Set the Deezer__Arl environment variable");
-            return;
-        }
-
-        WriteStatus("Deezer ARL", MaskSecret(arl), ConsoleColor.Cyan);
-        
-        if (!string.IsNullOrWhiteSpace(arlFallback))
-        {
-            WriteStatus("Deezer ARL Fallback", MaskSecret(arlFallback), ConsoleColor.Cyan);
-        }
-
-        WriteStatus("Deezer Quality", string.IsNullOrWhiteSpace(quality) ? "auto (highest available)" : quality, ConsoleColor.Cyan);
-
-        // Validate ARL by calling Deezer API
-        await ValidateArlTokenAsync(arl, "primary", cancellationToken);
-        
-        if (!string.IsNullOrWhiteSpace(arlFallback))
-        {
-            await ValidateArlTokenAsync(arlFallback, "fallback", cancellationToken);
-        }
-    }
-
-    private async Task ValidateQobuzAsync(CancellationToken cancellationToken)
-    {
-        var userAuthToken = _qobuzSettings.Value.UserAuthToken;
-        var userId = _qobuzSettings.Value.UserId;
-        var quality = _qobuzSettings.Value.Quality;
-
-        Console.WriteLine();
-
-        if (string.IsNullOrWhiteSpace(userAuthToken))
-        {
-            WriteStatus("Qobuz UserAuthToken", "NOT CONFIGURED", ConsoleColor.Red);
-            WriteDetail("Set the Qobuz__UserAuthToken environment variable");
-            return;
-        }
-
-        if (string.IsNullOrWhiteSpace(userId))
-        {
-            WriteStatus("Qobuz UserId", "NOT CONFIGURED", ConsoleColor.Red);
-            WriteDetail("Set the Qobuz__UserId environment variable");
-            return;
-        }
-
-        WriteStatus("Qobuz UserAuthToken", MaskSecret(userAuthToken), ConsoleColor.Cyan);
-        WriteStatus("Qobuz UserId", userId, ConsoleColor.Cyan);
-        WriteStatus("Qobuz Quality", quality ?? "auto (highest available)", ConsoleColor.Cyan);
-
-        // Validate token by calling Qobuz API
-        await ValidateQobuzTokenAsync(userAuthToken, userId, cancellationToken);
-    }
-
-    private async Task ValidateQobuzTokenAsync(string userAuthToken, string userId, CancellationToken cancellationToken)
-    {
-        const string fieldName = "Qobuz credentials";
-        
-        try
-        {
-            // First, get the app ID from bundle service (simple check)
-            var bundleUrl = "https://play.qobuz.com/login";
-            var bundleResponse = await _httpClient.GetAsync(bundleUrl, cancellationToken);
-            
-            if (!bundleResponse.IsSuccessStatusCode)
-            {
-                WriteStatus(fieldName, "UNABLE TO VERIFY", ConsoleColor.Yellow);
-                WriteDetail("Could not fetch Qobuz app configuration");
-                return;
-            }
-
-            // Try to validate with a simple API call
-            // We'll use the user favorites endpoint which requires authentication
-            var appId = "798273057"; // Fallback app ID
-            var apiUrl = $"https://www.qobuz.com/api.json/0.2/favorite/getUserFavorites?user_id={userId}&app_id={appId}";
-            
-            using var request = new HttpRequestMessage(HttpMethod.Get, apiUrl);
-            request.Headers.Add("X-App-Id", appId);
-            request.Headers.Add("X-User-Auth-Token", userAuthToken);
-            request.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:83.0) Gecko/20100101 Firefox/83.0");
-
-            var response = await _httpClient.SendAsync(request, cancellationToken);
-
-            if (!response.IsSuccessStatusCode)
-            {
-                // 401 means invalid token, other errors might be network issues
-                if (response.StatusCode == System.Net.HttpStatusCode.Unauthorized)
-                {
-                    WriteStatus(fieldName, "INVALID", ConsoleColor.Red);
-                    WriteDetail("Token is expired or invalid");
-                }
-                else
-                {
-                    WriteStatus(fieldName, $"HTTP {(int)response.StatusCode}", ConsoleColor.Yellow);
-                    WriteDetail("Unable to verify credentials");
-                }
-                return;
-            }
-
-            var json = await response.Content.ReadAsStringAsync(cancellationToken);
-            
-            // If we got a successful response, credentials are valid
-            if (!string.IsNullOrEmpty(json) && !json.Contains("\"error\""))
-            {
-                WriteStatus(fieldName, "VALID", ConsoleColor.Green);
-                WriteDetail($"User ID: {userId}");
-            }
-            else
-            {
-                WriteStatus(fieldName, "INVALID", ConsoleColor.Red);
-                WriteDetail("Unexpected response from Qobuz");
-            }
-        }
-        catch (TaskCanceledException)
-        {
-            WriteStatus(fieldName, "TIMEOUT", ConsoleColor.Yellow);
-            WriteDetail("Could not reach Qobuz within 10 seconds");
-        }
-        catch (HttpRequestException ex)
-        {
-            WriteStatus(fieldName, "UNREACHABLE", ConsoleColor.Yellow);
-            WriteDetail(ex.Message);
-        }
-        catch (Exception ex)
-        {
-            WriteStatus(fieldName, "ERROR", ConsoleColor.Red);
-            WriteDetail(ex.Message);
-        }
-    }
-
-    private async Task ValidateArlTokenAsync(string arl, string label, CancellationToken cancellationToken)
-    {
-        var fieldName = $"Deezer ARL ({label})";
-        
-        try
-        {
-            using var request = new HttpRequestMessage(HttpMethod.Post,
-                "https://www.deezer.com/ajax/gw-light.php?method=deezer.getUserData&input=3&api_version=1.0&api_token=null");
-            
-            request.Headers.Add("Cookie", $"arl={arl}");
-            request.Content = new StringContent("{}", Encoding.UTF8, "application/json");
-
-            var response = await _httpClient.SendAsync(request, cancellationToken);
-
-            if (!response.IsSuccessStatusCode)
-            {
-                WriteStatus(fieldName, $"HTTP {(int)response.StatusCode}", ConsoleColor.Red);
-                return;
-            }
-
-            var json = await response.Content.ReadAsStringAsync(cancellationToken);
-            var doc = JsonDocument.Parse(json);
-
-            if (doc.RootElement.TryGetProperty("results", out var results) &&
-                results.TryGetProperty("USER", out var user))
-            {
-                if (user.TryGetProperty("USER_ID", out var userId))
-                {
-                    var userIdValue = userId.ValueKind == JsonValueKind.Number 
-                        ? userId.GetInt64() 
-                        : long.TryParse(userId.GetString(), out var parsed) ? parsed : 0;
-
-                    if (userIdValue > 0)
-                    {
-                        // BLOG_NAME is the username displayed on Deezer
-                        var userName = user.TryGetProperty("BLOG_NAME", out var blogName) && blogName.GetString() is string bn && !string.IsNullOrEmpty(bn)
-                            ? bn
-                            : user.TryGetProperty("NAME", out var name) && name.GetString() is string n && !string.IsNullOrEmpty(n)
-                                ? n
-                                : "Unknown";
-                        
-                        var offerName = GetOfferName(user);
-                        
-                        WriteStatus(fieldName, "VALID", ConsoleColor.Green);
-                        WriteDetail($"Logged in as {userName} ({offerName})");
-                        return;
-                    }
-                }
-                
-                WriteStatus(fieldName, "INVALID", ConsoleColor.Red);
-                WriteDetail("Token is expired or invalid");
-            }
-            else
-            {
-                WriteStatus(fieldName, "INVALID", ConsoleColor.Red);
-                WriteDetail("Unexpected response from Deezer");
-            }
-        }
-        catch (TaskCanceledException)
-        {
-            WriteStatus(fieldName, "TIMEOUT", ConsoleColor.Yellow);
-            WriteDetail("Could not reach Deezer within 10 seconds");
-        }
-        catch (HttpRequestException ex)
-        {
-            WriteStatus(fieldName, "UNREACHABLE", ConsoleColor.Yellow);
-            WriteDetail(ex.Message);
-        }
-        catch (Exception ex)
-        {
-            WriteStatus(fieldName, "ERROR", ConsoleColor.Red);
-            WriteDetail(ex.Message);
-        }
-    }
-
-    private static string GetOfferName(JsonElement user)
-    {
-        if (!user.TryGetProperty("OPTIONS", out var options))
-        {
-            return "Free";
-        }
-
-        // Check actual streaming capabilities, not just license_token presence
-        var hasLossless = options.TryGetProperty("web_lossless", out var webLossless) && webLossless.GetBoolean();
-        var hasHq = options.TryGetProperty("web_hq", out var webHq) && webHq.GetBoolean();
-
-        if (hasLossless)
-        {
-            return "Premium+ (Lossless)";
-        }
-        
-        if (hasHq)
-        {
-            return "Premium (HQ)";
-        }
-        
-        return "Free";
-    }
-
     private static void WriteStatus(string label, string value, ConsoleColor valueColor)
     {
         Console.Write($"  {label}: ");
@@ -375,23 +142,4 @@ public class StartupValidationService : IHostedService
         Console.WriteLine($"    -> {message}");
         Console.ForegroundColor = originalColor;
     }
-
-    /// <summary>
-    /// Masks a secret string, showing only the first 4 characters followed by asterisks.
-    /// </summary>
-    private static string MaskSecret(string secret)
-    {
-        if (string.IsNullOrEmpty(secret))
-        {
-            return "(empty)";
-        }
-
-        const int visibleChars = 4;
-        if (secret.Length <= visibleChars)
-        {
-            return new string('*', secret.Length);
-        }
-
-        return secret[..visibleChars] + new string('*', Math.Min(secret.Length - visibleChars, 8));
-    }
 }