Feature: Add dynamic model selection to ViewReceipt page

Enhance receipt parsing model selection:
- Fetch available models from LlamaCpp server dynamically
- Show loaded/unloaded status in model dropdown
- Persist selected model to appsettings.json
- Read default model from AI:ReceiptParsingModel config
- Inject LlamaCppVisionClient and IConfiguration dependencies

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

MoneyMap/Pages/ViewReceipt.cshtml

@@ -165,20 +165,25 @@
                         <div class="mb-2">
                             <label for="model" class="form-label small">AI Model</label>
                             <select name="model" id="model" class="form-select form-select-sm">
-                                <optgroup label="Local (llama.cpp)">
+                                @if (Model.AvailableModels.Any())
-                                    <option value="llamacpp:GLM-4.6V-UD-Q4_K_XL-00001-of-00002">GLM-4.6V (Vision)</option>
+                                {
-                                </optgroup>
+                                    <optgroup label="Local (llama.cpp)">
-                                <optgroup label="Local (Ollama)">
+                                        @foreach (var m in Model.AvailableModels)
-                                    <option value="ollama:llava">LLaVA (Vision)</option>
+                                        {
-                                    <option value="ollama:llava:13b">LLaVA 13B (Vision)</option>
+                                            var modelValue = $"llamacpp:{m.Id}";
-                                </optgroup>
+                                            <option value="@modelValue" selected="@(Model.SelectedModel == modelValue)">
+                                                @(m.IsLoaded ? "[Loaded] " : "")@m.Id
+                                            </option>
+                                        }
+                                    </optgroup>
+                                }
                                 <optgroup label="OpenAI">
-                                    <option value="gpt-4o-mini" selected>GPT-4o Mini (Fast & Cheap)</option>
+                                    <option value="gpt-4o-mini" selected="@(Model.SelectedModel == "gpt-4o-mini")">GPT-4o Mini (Fast & Cheap)</option>
-                                    <option value="gpt-4o">GPT-4o (Smarter)</option>
+                                    <option value="gpt-4o" selected="@(Model.SelectedModel == "gpt-4o")">GPT-4o (Smarter)</option>
                                 </optgroup>
                                 <optgroup label="Anthropic">
-                                    <option value="claude-3-5-haiku-20241022">Claude 3.5 Haiku (Fast)</option>
+                                    <option value="claude-3-5-haiku-20241022" selected="@(Model.SelectedModel == "claude-3-5-haiku-20241022")">Claude 3.5 Haiku (Fast)</option>
-                                    <option value="claude-3-5-sonnet-20241022">Claude 3.5 Sonnet (Best)</option>
+                                    <option value="claude-3-5-sonnet-20241022" selected="@(Model.SelectedModel == "claude-3-5-sonnet-20241022")">Claude 3.5 Sonnet (Best)</option>
                                 </optgroup>
                             </select>
                         </div>

MoneyMap/Pages/ViewReceipt.cshtml.cs

@@ -4,6 +4,8 @@ using Microsoft.EntityFrameworkCore;
 using MoneyMap.Data;
 using MoneyMap.Models;
 using MoneyMap.Services;
+using System.Text.Json;
+using System.Text.Json.Nodes;
 
 namespace MoneyMap.Pages
 {
@@ -12,22 +14,33 @@ namespace MoneyMap.Pages
         private readonly MoneyMapContext _db;
         private readonly IReceiptManager _receiptManager;
         private readonly IEnumerable<IReceiptParser> _parsers;
+        private readonly LlamaCppVisionClient _llamaClient;
+        private readonly IConfiguration _config;
+        private readonly IWebHostEnvironment _env;
 
         public ViewReceiptModel(
             MoneyMapContext db,
             IReceiptManager receiptManager,
-            IEnumerable<IReceiptParser> parsers)
+            IEnumerable<IReceiptParser> parsers,
+            LlamaCppVisionClient llamaClient,
+            IConfiguration config,
+            IWebHostEnvironment env)
         {
             _db = db;
             _receiptManager = receiptManager;
             _parsers = parsers;
+            _llamaClient = llamaClient;
+            _config = config;
+            _env = env;
         }
 
         public Receipt? Receipt { get; set; }
         public List<ReceiptLineItem> LineItems { get; set; } = new();
         public List<ReceiptParseLog> ParseLogs { get; set; } = new();
         public List<ParserOption> AvailableParsers { get; set; } = new();
+        public List<LlamaCppModel> AvailableModels { get; set; } = new();
         public string ReceiptUrl { get; set; } = "";
+        public string SelectedModel => _config["AI:ReceiptParsingModel"] ?? "gpt-4o-mini";
 
         [TempData]
         public string? SuccessMessage { get; set; }
@@ -59,6 +72,9 @@ namespace MoneyMap.Pages
                 FullName = p.GetType().Name
             }).ToList();
 
+            // Get available LlamaCpp models
+            AvailableModels = await _llamaClient.GetAvailableModelsAsync();
+
             return Page();
         }
 
@@ -94,6 +110,12 @@ namespace MoneyMap.Pages
                 return RedirectToPage(new { id });
             }
 
+            // Save selected model to config if it changed
+            if (!string.IsNullOrEmpty(model) && model != SelectedModel)
+            {
+                await SaveSelectedModelAsync(model);
+            }
+
             var result = await selectedParser.ParseReceiptAsync(id, model);
 
             if (result.IsSuccess)
@@ -108,6 +130,33 @@ namespace MoneyMap.Pages
             return RedirectToPage(new { id });
         }
 
+        private async Task SaveSelectedModelAsync(string model)
+        {
+            try
+            {
+                var appSettingsPath = Path.Combine(_env.ContentRootPath, "appsettings.json");
+                var json = await System.IO.File.ReadAllTextAsync(appSettingsPath);
+                var jsonNode = JsonNode.Parse(json);
+
+                if (jsonNode == null) return;
+
+                // Ensure AI section exists
+                if (jsonNode["AI"] == null)
+                {
+                    jsonNode["AI"] = new JsonObject();
+                }
+
+                jsonNode["AI"]!["ReceiptParsingModel"] = model;
+
+                var options = new JsonSerializerOptions { WriteIndented = true };
+                await System.IO.File.WriteAllTextAsync(appSettingsPath, jsonNode.ToJsonString(options));
+            }
+            catch
+            {
+                // Silently fail - not critical if we can't save the preference
+            }
+        }
+
         public class ParserOption
         {
             public string Name { get; set; } = "";

MoneyMap/Services/AIReceiptParser.cs

@@ -21,6 +21,7 @@ namespace MoneyMap.Services
         private readonly LlamaCppVisionClient _llamaCppClient;
         private readonly IMerchantService _merchantService;
         private readonly IServiceProvider _serviceProvider;
+        private readonly IConfiguration _configuration;
         private readonly ILogger<AIReceiptParser> _logger;
         private string? _promptTemplate;
 
@@ -34,6 +35,7 @@ namespace MoneyMap.Services
             LlamaCppVisionClient llamaCppClient,
             IMerchantService merchantService,
             IServiceProvider serviceProvider,
+            IConfiguration configuration,
             ILogger<AIReceiptParser> logger)
         {
             _db = db;
@@ -45,6 +47,7 @@ namespace MoneyMap.Services
             _llamaCppClient = llamaCppClient;
             _merchantService = merchantService;
             _serviceProvider = serviceProvider;
+            _configuration = configuration;
             _logger = logger;
         }
 
@@ -57,7 +60,7 @@ namespace MoneyMap.Services
             if (receipt == null)
                 return ReceiptParseResult.Failure("Receipt not found.");
 
-            var selectedModel = model ?? "gpt-4o-mini";
+            var selectedModel = model ?? _configuration["AI:ReceiptParsingModel"] ?? "gpt-4o-mini";
             var isLlamaCpp = selectedModel.StartsWith("llamacpp:");
             var isOllama = selectedModel.StartsWith("ollama:");
             var isClaude = selectedModel.StartsWith("claude-");