fix(back-end): shift model

backend/src/main/java/com/printcalculator/service/SlicerService.java

@@ -65,37 +65,38 @@ public class SlicerService {
             mapper.writeValue(fFile, filamentProfile);
             mapper.writeValue(pFile, processProfile);
 
-            // 3. Build Command
-            // --load-settings "machine.json;process.json" --load-filaments "filament.json"
+            String basename = inputStl.getName();
+            if (basename.toLowerCase().endsWith(".stl")) {
+                basename = basename.substring(0, basename.length() - 4);
+            }
+            Path slicerLogPath = tempDir.resolve("orcaslicer.log");
+
+            // 3. Run slicer. Retry with arrange only for out-of-volume style failures.
+            for (boolean useArrange : new boolean[]{false, true}) {
                 List<String> command = new ArrayList<>();
                 command.add(slicerPath);
-            
-            // Load machine settings
                 command.add("--load-settings");
                 command.add(mFile.getAbsolutePath());
-            
-            // Load process settings
                 command.add("--load-settings");
                 command.add(pFile.getAbsolutePath());
                 command.add("--load-filaments");
                 command.add(fFile.getAbsolutePath());
                 command.add("--ensure-on-bed");
-            // Single-model jobs do not need arrange; it can fail on near-limit models.
+                if (useArrange) {
+                    command.add("--arrange");
+                    command.add("1");
+                }
                 command.add("--slice");
-            command.add("0"); // slice plate 0
+                command.add("0");
                 command.add("--outputdir");
                 command.add(tempDir.toAbsolutePath().toString());
-            // Need to handle Mac structure for console if needed? 
-            // Usually the binary at Contents/MacOS/OrcaSlicer works fine as console app.
-            
                 command.add(inputStl.getAbsolutePath());
 
-            logger.info("Executing Slicer: " + String.join(" ", command));
+                logger.info("Executing Slicer" + (useArrange ? " (retry with arrange)" : "") + ": " + String.join(" ", command));
 
-            // 4. Run Process
+                Files.deleteIfExists(slicerLogPath);
                 ProcessBuilder pb = new ProcessBuilder(command);
                 pb.directory(tempDir.toFile());
-            Path slicerLogPath = tempDir.resolve("orcaslicer.log");
                 pb.redirectErrorStream(true);
                 pb.redirectOutput(slicerLogPath.toFile());
 
@@ -112,19 +113,15 @@ public class SlicerService {
                     if (Files.exists(slicerLogPath)) {
                         error = Files.readString(slicerLogPath, StandardCharsets.UTF_8);
                     }
-                throw new IOException("Slicer failed with exit code " + process.exitValue() + ": " + error);
+                    if (!useArrange && isOutOfVolumeError(error)) {
+                        logger.warning("Slicer reported model out of printable area, retrying with arrange.");
+                        continue;
                     }
-
-            // 5. Find Output GCode
-            // Usually [basename].gcode or plate_1.gcode
-            String basename = inputStl.getName();
-            if (basename.toLowerCase().endsWith(".stl")) {
-                basename = basename.substring(0, basename.length() - 4);
+                    throw new IOException("Slicer failed with exit code " + process.exitValue() + ": " + error);
                 }
 
                 File gcodeFile = tempDir.resolve(basename + ".gcode").toFile();
                 if (!gcodeFile.exists()) {
-                // Try plate_1.gcode fallback
                     File alt = tempDir.resolve("plate_1.gcode").toFile();
                     if (alt.exists()) {
                         gcodeFile = alt;
@@ -133,8 +130,10 @@ public class SlicerService {
                     }
                 }
 
-            // 6. Parse Results
                 return gCodeParser.parse(gcodeFile);
+            }
+
+            throw new IOException("Slicer failed after retry");
 
         } catch (InterruptedException e) {
             Thread.currentThread().interrupt();
@@ -161,4 +160,15 @@ public class SlicerService {
             logger.warning("Failed to walk temp directory " + path + ": " + e.getMessage());
         }
     }
+
+    private boolean isOutOfVolumeError(String errorLog) {
+        if (errorLog == null || errorLog.isBlank()) {
+            return false;
+        }
+
+        String normalized = errorLog.toLowerCase();
+        return normalized.contains("nothing to be sliced")
+                || normalized.contains("no object is fully inside the print volume")
+                || normalized.contains("calc_exclude_triangles");
+    }
 }