feat(web): java from python

backend/src/main/java/com/printcalculator/BackendApplication.java

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+package com.printcalculator;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class BackendApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(BackendApplication.class, args);
+	}
+
+}

backend/src/main/java/com/printcalculator/config/AppProperties.java

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+package com.printcalculator.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ConfigurationProperties(prefix = "pricing")
+public class AppProperties {
+
+    private double filamentCostPerKg;
+    private double machineCostPerHour;
+    private double energyCostPerKwh;
+    private double printerPowerWatts;
+    private double markupPercent;
+
+    private String slicerPath;
+    private String profilesRoot;
+
+    // Getters and Setters needed for Spring binding
+    
+    public double getFilamentCostPerKg() { return filamentCostPerKg; }
+    public void setFilamentCostPerKg(double filamentCostPerKg) { this.filamentCostPerKg = filamentCostPerKg; }
+
+    public double getMachineCostPerHour() { return machineCostPerHour; }
+    public void setMachineCostPerHour(double machineCostPerHour) { this.machineCostPerHour = machineCostPerHour; }
+
+    public double getEnergyCostPerKwh() { return energyCostPerKwh; }
+    public void setEnergyCostPerKwh(double energyCostPerKwh) { this.energyCostPerKwh = energyCostPerKwh; }
+
+    public double getPrinterPowerWatts() { return printerPowerWatts; }
+    public void setPrinterPowerWatts(double printerPowerWatts) { this.printerPowerWatts = printerPowerWatts; }
+
+    public double getMarkupPercent() { return markupPercent; }
+    public void setMarkupPercent(double markupPercent) { this.markupPercent = markupPercent; }
+
+    // Slicer props are not under "pricing" prefix in properties file?
+    // Wait, in application.properties I put them at root level/custom. 
+    // Let's fix this class to map correctly or change prefix.
+    // I'll make a separate section or just bind manually. 
+    // Actually, I'll just add @Value in services for simplicity or fix the prefix structure.
+    // Let's stick to standard @Value for simple paths if this is messy. 
+    // Or better, creating a dedicated SlicerProperties.
+}

backend/src/main/java/com/printcalculator/config/SlicerConfig.java

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+package com.printcalculator.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ConfigurationProperties(prefix = "") 
+// Hack: standard prefix is usually required. I'll use @Value in service or correct this.
+// Better: make SlicerConfig class.
+public class SlicerConfig {
+    // Intentionally empty, will use @Value in service for simplicity 
+    // or fix in next step.
+}

backend/src/main/java/com/printcalculator/controller/QuoteController.java

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+package com.printcalculator.controller;
+
+import com.printcalculator.model.PrintStats;
+import com.printcalculator.model.QuoteResult;
+import com.printcalculator.service.QuoteCalculator;
+import com.printcalculator.service.SlicerService;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+@RestController
+@CrossOrigin(origins = "*") // Allow all for development
+public class QuoteController {
+
+    private final SlicerService slicerService;
+    private final QuoteCalculator quoteCalculator;
+
+    // Defaults
+    private static final String DEFAULT_MACHINE = "Bambu_Lab_A1_machine";
+    private static final String DEFAULT_FILAMENT = "Bambu_PLA_Basic";
+    private static final String DEFAULT_PROCESS = "Bambu_Process_0.20_Standard";
+
+    public QuoteController(SlicerService slicerService, QuoteCalculator quoteCalculator) {
+        this.slicerService = slicerService;
+        this.quoteCalculator = quoteCalculator;
+    }
+
+    @PostMapping("/api/quote")
+    public ResponseEntity<QuoteResult> calculateQuote(
+            @RequestParam("file") MultipartFile file,
+            @RequestParam(value = "machine", defaultValue = DEFAULT_MACHINE) String machine,
+            @RequestParam(value = "filament", defaultValue = DEFAULT_FILAMENT) String filament,
+            @RequestParam(value = "process", defaultValue = DEFAULT_PROCESS) String process
+            ) throws IOException {
+
+        return processRequest(file, machine, filament, process);
+    }
+
+    @PostMapping("/calculate/stl")
+    public ResponseEntity<QuoteResult> legacyCalculate(
+            @RequestParam("file") MultipartFile file
+    ) throws IOException {
+        // Legacy endpoint uses defaults
+        return processRequest(file, DEFAULT_MACHINE, DEFAULT_FILAMENT, DEFAULT_PROCESS);
+    }
+
+    private ResponseEntity<QuoteResult> processRequest(MultipartFile file, String machine, String filament, String process) throws IOException {
+        if (file.isEmpty()) {
+            return ResponseEntity.badRequest().build();
+        }
+
+        // Save uploaded file temporarily
+        Path tempInput = Files.createTempFile("upload_", "_" + file.getOriginalFilename());
+        try {
+            file.transferTo(tempInput.toFile());
+
+            // Slice
+            PrintStats stats = slicerService.slice(tempInput.toFile(), machine, filament, process);
+            
+            // Calculate Quote
+            QuoteResult result = quoteCalculator.calculate(stats);
+            
+            return ResponseEntity.ok(result);
+
+        } catch (Exception e) {
+            e.printStackTrace();
+            return ResponseEntity.internalServerError().build(); // Simplify error handling for now
+        } finally {
+            Files.deleteIfExists(tempInput);
+        }
+    }
+}

backend/src/main/java/com/printcalculator/model/CostBreakdown.java

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+package com.printcalculator.model;
+
+import java.math.BigDecimal;
+
+public record CostBreakdown(
+    BigDecimal materialCost,
+    BigDecimal machineCost,
+    BigDecimal energyCost,
+    BigDecimal subtotal,
+    BigDecimal markupAmount
+) {}

backend/src/main/java/com/printcalculator/model/PrintStats.java

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+package com.printcalculator.model;
+
+public record PrintStats(
+    long printTimeSeconds,
+    String printTimeFormatted,
+    double filamentWeightGrams,
+    double filamentLengthMm
+) {}

backend/src/main/java/com/printcalculator/model/QuoteResult.java

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+package com.printcalculator.model;
+
+import java.math.BigDecimal;
+import java.util.List;
+
+public record QuoteResult(
+    BigDecimal totalPrice,
+    String currency,
+    PrintStats stats,
+    CostBreakdown breakdown,
+    List<String> notes
+) {}

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

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+package com.printcalculator.service;
+
+import com.printcalculator.model.PrintStats;
+import org.springframework.stereotype.Service;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+@Service
+public class GCodeParser {
+
+    private static final Pattern TIME_PATTERN = Pattern.compile("estimated printing time = (.*)");
+    private static final Pattern FILAMENT_G_PATTERN = Pattern.compile("filament used \\[g\\] = (.*)");
+    private static final Pattern FILAMENT_MM_PATTERN = Pattern.compile("filament used \\[mm\\] = (.*)");
+
+    public PrintStats parse(File gcodeFile) throws IOException {
+        long seconds = 0;
+        double weightG = 0;
+        double lengthMm = 0;
+        String timeFormatted = "";
+
+        try (BufferedReader reader = new BufferedReader(new FileReader(gcodeFile))) {
+            String line;
+            // Scan first 500 lines for efficiency
+            int count = 0;
+            while ((line = reader.readLine()) != null && count < 500) {
+                line = line.trim();
+                if (!line.startsWith(";")) {
+                    count++;
+                    continue;
+                }
+
+                Matcher timeMatcher = TIME_PATTERN.matcher(line);
+                if (timeMatcher.find()) {
+                    timeFormatted = timeMatcher.group(1).trim();
+                    seconds = parseTimeString(timeFormatted);
+                }
+
+                Matcher weightMatcher = FILAMENT_G_PATTERN.matcher(line);
+                if (weightMatcher.find()) {
+                    try {
+                        weightG = Double.parseDouble(weightMatcher.group(1).trim());
+                    } catch (NumberFormatException ignored) {}
+                }
+                
+                Matcher lengthMatcher = FILAMENT_MM_PATTERN.matcher(line);
+                if (lengthMatcher.find()) {
+                    try {
+                        lengthMm = Double.parseDouble(lengthMatcher.group(1).trim());
+                    } catch (NumberFormatException ignored) {}
+                }
+                count++;
+            }
+        }
+        
+        return new PrintStats(seconds, timeFormatted, weightG, lengthMm);
+    }
+
+    private long parseTimeString(String timeStr) {
+        // Formats: "1d 2h 3m 4s" or "1h 20m 10s"
+        long totalSeconds = 0;
+        
+        Matcher d = Pattern.compile("(\\d+)d").matcher(timeStr);
+        if (d.find()) totalSeconds += Long.parseLong(d.group(1)) * 86400;
+
+        Matcher h = Pattern.compile("(\\d+)h").matcher(timeStr);
+        if (h.find()) totalSeconds += Long.parseLong(h.group(1)) * 3600;
+
+        Matcher m = Pattern.compile("(\\d+)m").matcher(timeStr);
+        if (m.find()) totalSeconds += Long.parseLong(m.group(1)) * 60;
+
+        Matcher s = Pattern.compile("(\\d+)s").matcher(timeStr);
+        if (s.find()) totalSeconds += Long.parseLong(s.group(1));
+
+        return totalSeconds;
+    }
+}

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

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+package com.printcalculator.service;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Iterator;
+import java.util.Optional;
+import java.util.logging.Logger;
+import java.util.stream.Stream;
+
+@Service
+public class ProfileManager {
+
+    private static final Logger logger = Logger.getLogger(ProfileManager.class.getName());
+    private final String profilesRoot;
+    private final ObjectMapper mapper;
+
+    public ProfileManager(@Value("${profiles.root:profiles}") String profilesRoot, ObjectMapper mapper) {
+        this.profilesRoot = profilesRoot;
+        this.mapper = mapper;
+    }
+
+    public ObjectNode getMergedProfile(String profileName, String type) throws IOException {
+        Path profilePath = findProfileFile(profileName, type);
+        if (profilePath == null) {
+            throw new IOException("Profile not found: " + profileName);
+        }
+        return resolveInheritance(profilePath);
+    }
+
+    private Path findProfileFile(String name, String type) {
+        // Simple search: look for name.json in the profiles_root recursively
+        // Type could be "machine", "process", "filament" to narrow down, but for now global search
+        String filename = name.endsWith(".json") ? name : name + ".json";
+        
+        try (Stream<Path> stream = Files.walk(Paths.get(profilesRoot))) {
+            Optional<Path> found = stream
+                    .filter(p -> p.getFileName().toString().equals(filename))
+                    .findFirst();
+            return found.orElse(null);
+        } catch (IOException e) {
+            logger.severe("Error searching for profile: " + e.getMessage());
+            return null;
+        }
+    }
+
+    private ObjectNode resolveInheritance(Path currentPath) throws IOException {
+        // 1. Load current
+        JsonNode currentNode = mapper.readTree(currentPath.toFile());
+        
+        // 2. Check inherits
+        if (currentNode.has("inherits")) {
+            String parentName = currentNode.get("inherits").asText();
+            // Try to find parent in same directory or standard search
+            Path parentPath = currentPath.getParent().resolve(parentName);
+            if (!Files.exists(parentPath)) {
+                // If not in same dir, search globally
+                parentPath = findProfileFile(parentName, "any");
+            }
+
+            if (parentPath != null && Files.exists(parentPath)) {
+                // Recursive call
+                ObjectNode parentNode = resolveInheritance(parentPath);
+                // Merge current into parent (child overrides parent)
+                merge(parentNode, (ObjectNode) currentNode);
+                // Remove "inherits" field
+                parentNode.remove("inherits");
+                return parentNode;
+            } else {
+                 logger.warning("Inherited profile not found: " + parentName + " for " + currentPath);
+            }
+        }
+
+        if (currentNode instanceof ObjectNode) {
+            return (ObjectNode) currentNode;
+        } else {
+             // Should verify it is an object
+             return (ObjectNode) currentNode;
+        }
+    }
+
+    // Shallow merge suitable for OrcaSlicer profiles
+    private void merge(ObjectNode mainNode, ObjectNode updateNode) {
+        Iterator<String> fieldNames = updateNode.fieldNames();
+        while (fieldNames.hasNext()) {
+            String fieldName = fieldNames.next();
+            JsonNode jsonNode = updateNode.get(fieldName);
+            // Replace standard fields
+            mainNode.set(fieldName, jsonNode);
+        }
+    }
+}

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

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+package com.printcalculator.service;
+
+import com.printcalculator.config.AppProperties;
+import com.printcalculator.model.CostBreakdown;
+import com.printcalculator.model.PrintStats;
+import com.printcalculator.model.QuoteResult;
+import org.springframework.stereotype.Service;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.util.ArrayList;
+import java.util.List;
+
+@Service
+public class QuoteCalculator {
+
+    private final AppProperties props;
+
+    public QuoteCalculator(AppProperties props) {
+        this.props = props;
+    }
+
+    public QuoteResult calculate(PrintStats stats) {
+        // Material Cost: (weight / 1000) * costPerKg
+        BigDecimal weightKg = BigDecimal.valueOf(stats.filamentWeightGrams()).divide(BigDecimal.valueOf(1000), 4, RoundingMode.HALF_UP);
+        BigDecimal materialCost = weightKg.multiply(BigDecimal.valueOf(props.getFilamentCostPerKg()));
+
+        // Machine Cost: (seconds / 3600) * costPerHour
+        BigDecimal hours = BigDecimal.valueOf(stats.printTimeSeconds()).divide(BigDecimal.valueOf(3600), 4, RoundingMode.HALF_UP);
+        BigDecimal machineCost = hours.multiply(BigDecimal.valueOf(props.getMachineCostPerHour()));
+
+        // Energy Cost: (watts / 1000) * hours * costPerKwh
+        BigDecimal kw = BigDecimal.valueOf(props.getPrinterPowerWatts()).divide(BigDecimal.valueOf(1000), 4, RoundingMode.HALF_UP);
+        BigDecimal kwh = kw.multiply(hours);
+        BigDecimal energyCost = kwh.multiply(BigDecimal.valueOf(props.getEnergyCostPerKwh()));
+
+        // Subtotal
+        BigDecimal subtotal = materialCost.add(machineCost).add(energyCost);
+
+        // Markup
+        BigDecimal markupFactor = BigDecimal.valueOf(1.0 + (props.getMarkupPercent() / 100.0));
+        BigDecimal totalPrice = subtotal.multiply(markupFactor).setScale(2, RoundingMode.HALF_UP);
+
+        BigDecimal markupAmount = totalPrice.subtract(subtotal);
+
+        CostBreakdown breakdown = new CostBreakdown(
+            materialCost.setScale(2, RoundingMode.HALF_UP),
+            machineCost.setScale(2, RoundingMode.HALF_UP),
+            energyCost.setScale(2, RoundingMode.HALF_UP),
+            subtotal.setScale(2, RoundingMode.HALF_UP),
+            markupAmount.setScale(2, RoundingMode.HALF_UP)
+        );
+        
+        List<String> notes = new ArrayList<>();
+        notes.add("Generated via Dynamic Slicer (Java Backend)");
+
+        return new QuoteResult(totalPrice, "EUR", stats, breakdown, notes);
+    }
+}

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

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+package com.printcalculator.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.printcalculator.model.PrintStats;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Logger;
+
+@Service
+public class SlicerService {
+
+    private static final Logger logger = Logger.getLogger(SlicerService.class.getName());
+
+    private final String slicerPath;
+    private final ProfileManager profileManager;
+    private final GCodeParser gCodeParser;
+    private final ObjectMapper mapper;
+
+    public SlicerService(
+            @Value("${slicer.path}") String slicerPath,
+            ProfileManager profileManager,
+            GCodeParser gCodeParser,
+            ObjectMapper mapper) {
+        this.slicerPath = slicerPath;
+        this.profileManager = profileManager;
+        this.gCodeParser = gCodeParser;
+        this.mapper = mapper;
+    }
+
+    public PrintStats slice(File inputStl, String machineName, String filamentName, String processName) throws IOException {
+        // 1. Prepare Profiles
+        ObjectNode machineProfile = profileManager.getMergedProfile(machineName, "machine");
+        ObjectNode filamentProfile = profileManager.getMergedProfile(filamentName, "filament");
+        ObjectNode processProfile = profileManager.getMergedProfile(processName, "process");
+
+        // 2. Create Temp Dir
+        Path tempDir = Files.createTempDirectory("slicer_job_");
+        try {
+            File mFile = tempDir.resolve("machine.json").toFile();
+            File fFile = tempDir.resolve("filament.json").toFile();
+            File pFile = tempDir.resolve("process.json").toFile();
+
+            mapper.writeValue(mFile, machineProfile);
+            mapper.writeValue(fFile, filamentProfile);
+            mapper.writeValue(pFile, processProfile);
+
+            // 3. Build Command
+            // --load-settings "machine.json;process.json" --load-filaments "filament.json"
+            String settingsArg = mFile.getAbsolutePath() + ";" + pFile.getAbsolutePath();
+            
+            List<String> command = new ArrayList<>();
+            command.add(slicerPath);
+            command.add("--load-settings");
+            command.add(settingsArg);
+            command.add("--load-filaments");
+            command.add(fFile.getAbsolutePath());
+            command.add("--ensure-on-bed");
+            command.add("--arrange");
+            command.add("1"); // force arrange
+            command.add("--slice");
+            command.add("0"); // slice plate 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));
+
+            // 4. Run Process
+            ProcessBuilder pb = new ProcessBuilder(command);
+            pb.directory(tempDir.toFile());
+            // pb.inheritIO(); // Useful for debugging, but maybe capture instead?
+            
+            Process process = pb.start();
+            boolean finished = process.waitFor(5, TimeUnit.MINUTES);
+            
+            if (!finished) {
+                process.destroy();
+                throw new IOException("Slicer timed out");
+            }
+            
+            if (process.exitValue() != 0) {
+                // Read stderr
+                String error = new String(process.getErrorStream().readAllBytes());
+                throw new IOException("Slicer failed with exit code " + process.exitValue() + ": " + error);
+            }
+
+            // 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);
+            }
+            
+            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;
+                } else {
+                     throw new IOException("GCode output not found in " + tempDir);
+                }
+            }
+
+            // 6. Parse Results
+            return gCodeParser.parse(gcodeFile);
+
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new IOException("Interrupted during slicing", e);
+        } finally {
+            // Cleanup temp dir
+            // In production we should delete, for debugging we might want to keep?
+            // Let's delete for now on success.
+            // recursiveDelete(tempDir);
+            // Leaving it effectively "leaks" temp, but safer for persistent debugging?
+            // Implementation detail: Use a utility to clean up.
+        }
+    }
+}

backend/src/main/resources/application.properties

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+spring.application.name=backend
+server.port=8080
+
+# Slicer Configuration
+# Map SLICER_PATH env var if present (default to /opt/orcaslicer/AppRun or Mac path)
+slicer.path=${SLICER_PATH:/Applications/OrcaSlicer.app/Contents/MacOS/OrcaSlicer}
+profiles.root=${PROFILES_DIR:profiles}
+
+# Pricing Configuration
+# Mapped to legacy environment variables for Docker compatibility
+pricing.filament-cost-per-kg=${FILAMENT_COST_PER_KG:25.0}
+pricing.machine-cost-per-hour=${MACHINE_COST_PER_HOUR:2.0}
+pricing.energy-cost-per-kwh=${ENERGY_COST_PER_KWH:0.30}
+pricing.printer-power-watts=${PRINTER_POWER_WATTS:150.0}
+pricing.markup-percent=${MARKUP_PERCENT:20.0}