Initial

PdfMarker/Services/BallooningService.cs

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+using PdfMarker.Models;
+
+namespace PdfMarker.Services;
+
+public class BallooningService
+{
+    private readonly PdfQuotaExtractor _quotaExtractor;
+    private readonly QuotaClusterer _clusterer;
+    private readonly IWebHostEnvironment _env;
+
+    public BallooningService(
+        PdfQuotaExtractor quotaExtractor,
+        QuotaClusterer clusterer,
+        IWebHostEnvironment env)
+    {
+        _quotaExtractor = quotaExtractor;
+        _clusterer = clusterer;
+        _env = env;
+    }
+
+    public async Task<AutoBalloonResult> GenerateAsync(string fileName)
+    {
+        // 1️⃣ Path fisico del PDF
+        var pdfPath = Path.Combine(
+            _env.WebRootPath,
+            "pdf",
+            fileName);
+
+        // 2️⃣ Estrazione QUOTE
+        var quotes = _quotaExtractor.Extract(pdfPath);
+
+        // 🔴 CHECK CRITICO
+        // se qui quotes è vuoto → il problema NON è il clustering
+        if (quotes.Count == 0)
+        {
+            return new AutoBalloonResult
+            {
+                Balloons = new List<BalloonVm>()
+            };
+        }
+
+        // 3️⃣ Clustering QUOTE → FEATURE
+        var features = _clusterer.Cluster(quotes);
+
+        // 4️⃣ Feature → Pallini
+        var balloons = new List<BalloonVm>();
+        int index = 1;
+
+        foreach (var feature in features)
+        {
+            balloons.Add(new BalloonVm
+            {
+                Number = index++,
+                Description = string.Join(" | ",
+                    feature.Quotes.Select(q => q.RawText)),
+                X = feature.CenterX,
+                Y = feature.CenterY,
+                Selected = false
+            });
+        }
+
+        // 5️⃣ Output finale
+        return new AutoBalloonResult
+        {
+            Balloons = balloons
+        };
+    }
+}