feat: add csv output support, refactor files const

app/build.gradle

@@ -10,8 +10,8 @@ android {
         applicationId "com.stock.pignon"
         minSdkVersion 17
         targetSdkVersion 36
-        versionCode 2
-        versionName "0.2.0"
+        versionCode 3
+        versionName "0.3.0"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }

app/src/main/java/com/stock/pignon/CartActionHelper.java

@@ -116,40 +116,47 @@ public class CartActionHelper {
     }
 
     /**
-     * Merges current cart items with the existing stock file on the SD Card.
+     * Merges current cart items with the existing stock file (json and csv) on the SD Card.
      */
     private static void saveCartToExternalFile(List<CartItem> cartItems) {
         File dir = new File(Environment.getExternalStorageDirectory(), Config.EXTERNAL_DIR_NAME);
-        File stockFile = new File(dir, Config.STOCK_FILE_NAME);
+        File stockFile = new File(dir, Config.OUPUT_JSON_NAME);
+        File csvFile = new File(dir, Config.OUPUT_CSV_NAME);
 
         Gson gson = new Gson();
-        Map<String, Integer> stockMap;
+        // Load previous list
+        Map<String, Integer> stockMap = loadExistingStock(stockFile, gson);
 
-        // Load data into a Map (Key: Item Name, Value: Total Quantity)
-        stockMap = loadExistingStock(stockFile, gson);
-
-        // Merge with new items from current cart
+        // Add current cart item
         for (CartItem item : cartItems) {
-            // Get previous quantity
             Integer qtyObj = stockMap.get(item.getName());
             int currentQty = (qtyObj != null) ? qtyObj : 0;
-            // Add
             stockMap.put(item.getName(), currentQty + item.getQuantity());
         }
 
-        // Overwrite the file with updated data
-        // Needs WRITE_EXTERNAL_STORAGE permission
+        // Save to JSON
         try (FileOutputStream fos = new FileOutputStream(stockFile);
-             @SuppressWarnings("CharsetObjectCanBeUsed")
              OutputStreamWriter writer = new OutputStreamWriter(fos, "UTF-8")) {
-
-            // Writing directly to the stream
             gson.toJson(stockMap, writer);
-            Log.i(TAG, "Stock updated successfully at: " + stockFile.getAbsolutePath());
-
         } catch (Exception e) {
             Log.e(TAG, "Failed to write stock file", e);
         }
+
+        // Save to CSV, french format with ";"
+        try (FileOutputStream fos = new FileOutputStream(csvFile);
+             OutputStreamWriter writer = new OutputStreamWriter(fos, "UTF-8")) {
+
+            // UTF-8 BOM and columns headers
+            writer.write('\ufeff');
+            writer.write("Article;Quantité\n");
+
+            for (Map.Entry<String, Integer> entry : stockMap.entrySet()) {
+                writer.write(entry.getKey().replace(";", ",") + ";" + entry.getValue() + "\n");
+            }
+            Log.i(TAG, "CSV Export updated successfully");
+        } catch (Exception e) {
+            Log.e(TAG, "Failed to write CSV file", e);
+        }
     }
 
     /**

app/src/main/java/com/stock/pignon/Config.java

@@ -9,8 +9,11 @@ public class Config {
     public static final String IMAGES_SUBDIR_NAME = "images";
 
     // Input json
-    public static final String PIECES_FILE_NAME = "pieces.json";
+    public static final String INPUT_JSON_NAME = "pieces.json";
 
     // Output json
-    public static final String STOCK_FILE_NAME = "stock.json";
+    public static final String OUPUT_JSON_NAME = "stock.json";
+
+    // Output json
+    public static final String OUPUT_CSV_NAME = "stock.csv";
 }

app/src/main/java/com/stock/pignon/ControlServer.java

@@ -37,12 +37,25 @@ public class ControlServer extends NanoHTTPD {
         // Get requested address
         String uri = session.getUri();
 
-        // Adapt URL to find the file : /stock.json become stock.json
-        if (uri.equals("/download_orders")) {
-            return downloadFile(Config.STOCK_FILE_NAME);
-        }
-        if (uri.equals("/download_json")) {
-            return downloadFile(Config.PIECES_FILE_NAME);
+        switch (uri) {
+            case "/download_input":
+                return downloadFile(Config.INPUT_JSON_NAME);
+
+            case "/output_json":
+                return viewFile(Config.OUPUT_JSON_NAME);
+
+            case "/download_output_json":
+                return downloadFile(Config.OUPUT_JSON_NAME);
+
+            case "/output_csv":
+                return viewFile(Config.OUPUT_CSV_NAME);
+
+            case "/download_output_csv":
+                return downloadFile(Config.OUPUT_CSV_NAME);
+
+            case "/":
+            case "/index.html":
+                return newFixedLengthResponse(getHtmlResponse());
         }
 
         // File upload management
@@ -54,8 +67,7 @@ public class ControlServer extends NanoHTTPD {
             }
         }
 
-        // Return UI
-        return newFixedLengthResponse(getHtmlResponse());
+        return newFixedLengthResponse(Response.Status.NOT_FOUND, MIME_PLAINTEXT, "❌ Page non trouvée");
     }
 
     /**
@@ -71,7 +83,7 @@ public class ControlServer extends NanoHTTPD {
                 "h1 { color: #0049AF; border-bottom: 2px solid #0049AF; }" +
                 "h2 { color: #555; margin-top: 30px; }" +
                 ".card { background: #f4f4f4; padding: 15px; border-radius: 8px; margin-bottom: 20px; border: 1px solid #ddd; }" +
-                ".btn { display: inline-block; width: 280px; height: 45px; line-height: 45px; text-align: center; background: #0049AF; color: white; text-decoration: none; border-radius: 4px; border: none; cursor: pointer; font-weight: bold; box-sizing: border-box; padding: 0; -webkit-appearance: none; font-family: inherit; font-size: 14px; font-style: normal; letter-spacing: normal; }" +
+                ".btn { display: inline-block; width: 280px; height: 45px; line-height: 45px; text-align: center; background: #0049AF; color: white; text-decoration: none; border-radius: 4px; border: none; cursor: pointer; font-weight: bold; box-sizing: border-box; padding: 0; -webkit-appearance: none; font-family: inherit; font-size: 14px; font-style: normal; letter-spacing: normal; margin: 10px 5px; vertical-align: middle;}" +
                 ".btn-download { background: #2E7D32; }" +
                 "input[type='file'] { margin: 10px 0; }" +
                 ".status { font-weight: bold; color: green; }" +
@@ -84,13 +96,16 @@ public class ControlServer extends NanoHTTPD {
                 "<div class='card'>" +
                 "<h3>Récupérer les sacoches des adhérent·es</h3>" +
                 "<p>Télécharger le décompte des pièces sorties de l'atelier.</p>" +
-                "<a href='/download_orders' class='btn'>Télécharger stock.json</a>" +
+                "<a href='/output_json' class='btn'>Voir stock.json</a>" +
+                "<a href='/output_csv' class='btn'>Voir stock.csv</a>" +
+                "<a href='/download_output_json' class='btn'>Télécharger stock.json</a>" +
+                "<a href='/download_output_csv' class='btn'>Télécharger stock.csv</a>" +
                 "</div>" +
 
                 "<h2>Modifier le catalogue</h2>" +
                 "<div class='card'>" +
                 "<h3>Gestion du fichier JSON</h3>" +
-                "<p>Catalogue actuel : <a href='/download_json' class='btn'>Télécharger pieces.json</a></p>" +
+                "<p>Catalogue actuel : <a href='/download_input' class='btn'>Télécharger pieces.json</a></p>" +
                 "<hr>" +
                 "<form action='/upload_json' method='post' enctype='multipart/form-data'>" +
                 "<p><strong>Envoyer un nouveau catalogue :</strong></p>" +
@@ -124,7 +139,7 @@ public class ControlServer extends NanoHTTPD {
             if (tmpPath == null) return newFixedLengthResponse("❌ Aucun fichier reçu.");
 
             File src = new File(tmpPath);
-            File dest = new File(baseDir, Config.PIECES_FILE_NAME);
+            File dest = new File(baseDir, Config.INPUT_JSON_NAME);
 
             copyFile(src, dest);
             return newFixedLengthResponse("✅ Catalogue mis à jour ! <a href='/'>Retour</a>");
@@ -179,20 +194,43 @@ public class ControlServer extends NanoHTTPD {
     }
 
     /**
-     * Prepare local file to send it to remote.
+     * Prepare file and offer as download
      */
     private Response downloadFile(String filename) {
         File file = new File(baseDir, filename);
         if (!file.exists()) {
-            return newFixedLengthResponse(Response.Status.NOT_FOUND, MIME_PLAINTEXT, "❌ Fichier non trouvé : " + filename);
+            return newFixedLengthResponse(Response.Status.NOT_FOUND, MIME_PLAINTEXT, "❌ Fichier non trouvé.");
         }
         try {
             InputStream is = new FileInputStream(file);
+
+            // Force download
             Response res = newChunkedResponse(Response.Status.OK, "application/octet-stream", is);
 
-            // Force file download name
             res.addHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
+            return res;
+        } catch (IOException e) {
+            return newFixedLengthResponse("❌ Erreur de lecture.");
+        }
+    }
 
+    /**
+     * Prepare file and print it in browser
+     */
+    private Response viewFile(String filename) {
+        File file = new File(baseDir, filename);
+        if (!file.exists()) {
+            return newFixedLengthResponse(Response.Status.NOT_FOUND, MIME_PLAINTEXT, "❌ Fichier non trouvé.");
+        }
+        try {
+            InputStream is = new FileInputStream(file);
+
+            // Force Mime type to print file inside browser
+            String mimeType = "text/plain";
+
+            Response res = newChunkedResponse(Response.Status.OK, mimeType + "; charset=utf-8", is);
+
+            res.addHeader("Content-Disposition", "inline");
             return res;
         } catch (IOException e) {
             return newFixedLengthResponse("❌ Erreur de lecture.");

app/src/main/java/com/stock/pignon/DataLoader.java

@@ -13,7 +13,7 @@ import java.util.List;
 public class DataLoader {
     private static final String TAG = "DataLoader"; // For readable logs
     private static final String EXTERNAL_DIR = Config.EXTERNAL_DIR_NAME;
-    private static final String PIECES_FILE = Config.PIECES_FILE_NAME;
+    private static final String PIECES_FILE = Config.INPUT_JSON_NAME;
 
     // Raw data
     private static List<Category> cachedCategories = new ArrayList<>();

app/src/main/java/com/stock/pignon/MainActivity.java

@@ -290,7 +290,7 @@ public class MainActivity extends AppCompatActivity {
             // Second safety : are we able to create folder ?
             if (folder.mkdirs()) {
                 // Copy JSON file
-                copyFileFromAssets(Config.PIECES_FILE_NAME, new File(folder, Config.PIECES_FILE_NAME));
+                copyFileFromAssets(Config.INPUT_JSON_NAME, new File(folder, Config.INPUT_JSON_NAME));
 
                 // Copy images subfolder
                 File imgFolder = new File(folder, Config.IMAGES_SUBDIR_NAME);