preparando el imprimir

src/main/java/com/imprimelibros/erp/pdf/DocumentSpec.java

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+package com.imprimelibros.erp.pdf;
+
+import java.util.Locale;
+import java.util.Map;
+
+public record DocumentSpec(
+    DocumentType type,
+    String templateId,         // p.ej. "presupuesto-a4"
+    Locale locale,
+    Map<String, Object> model  // data del documento
+) {}

src/main/java/com/imprimelibros/erp/pdf/DocumentType.java

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+package com.imprimelibros.erp.pdf;
+
+public enum DocumentType {
+    PRESUPUESTO, PEDIDO, FACTURA
+}

src/main/java/com/imprimelibros/erp/pdf/PdfController.java

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+package com.imprimelibros.erp.pdf;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.Locale;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api/pdf")
+public class PdfController {
+    private final PdfService pdfService;
+
+    public PdfController(PdfService pdfService) { this.pdfService = pdfService; }
+
+    @PostMapping("/{type}/{templateId}")
+    public ResponseEntity<byte[]> generate(
+            @PathVariable("type") DocumentType type,
+            @PathVariable String templateId,
+            @RequestBody Map<String,Object> model,
+            Locale locale) {
+
+        var spec = new DocumentSpec(type, templateId, locale, model);
+        var pdf = pdfService.generate(spec);
+
+        var fileName = type.name().toLowerCase() + "-" + templateId + ".pdf";
+        return ResponseEntity.ok()
+                .header("Content-Type", "application/pdf")
+                .header("Content-Disposition", "inline; filename=\"" + fileName + "\"")
+                .body(pdf);
+    }
+}

src/main/java/com/imprimelibros/erp/pdf/PdfModuleConfig.java

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+package com.imprimelibros.erp.pdf;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+import java.util.Map;
+
+@Configuration
+@ConfigurationProperties(prefix = "imprimelibros.pdf")
+public class PdfModuleConfig {
+    /**
+     * Mapa: "TYPE:templateId" -> "ruta thymeleaf" (sin extensión).
+     * Ej: "PRESUPUESTO:presupuesto-a4" -> "pdf/presupuesto-a4"
+     */
+    private Map<String, String> templates;
+
+    public Map<String, String> getTemplates() { return templates; }
+    public void setTemplates(Map<String, String> templates) { this.templates = templates; }
+}

src/main/java/com/imprimelibros/erp/pdf/PdfRenderer.java

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+package com.imprimelibros.erp.pdf;
+
+import com.openhtmltopdf.pdfboxout.PdfRendererBuilder;
+import org.springframework.core.io.Resource;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+import java.io.ByteArrayOutputStream;
+
+@Service
+public class PdfRenderer {
+
+    @Value("classpath:/static/")
+    private Resource staticRoot;
+
+    public byte[] renderHtmlToPdf(String html) {
+        try (var baos = new ByteArrayOutputStream()) {
+            var builder = new PdfRendererBuilder();
+
+            builder.useFont(() -> getClass().getResourceAsStream("/static/assets/fonts/OpenSans-Regular.ttf"), "Open Sans",
+                    400, com.openhtmltopdf.outputdevice.helper.BaseRendererBuilder.FontStyle.NORMAL, true);
+            builder.useFont(() -> getClass().getResourceAsStream("/static/assets/fonts/OpenSans-SemiBold.ttf"), "Open Sans",
+                    600, com.openhtmltopdf.outputdevice.helper.BaseRendererBuilder.FontStyle.NORMAL, true);
+            builder.useFont(() -> getClass().getResourceAsStream("/static/assets/fonts/OpenSans-Bold.ttf"), "Open Sans", 700,
+                    com.openhtmltopdf.outputdevice.helper.BaseRendererBuilder.FontStyle.NORMAL, true);
+
+            builder.useFastMode();
+            builder.withHtmlContent(html, baseUrl());
+            builder.toStream(baos);
+            builder.run();
+            return baos.toByteArray();
+        } catch (Exception e) {
+            throw new IllegalStateException("Error generando PDF", e);
+        }
+    }
+
+    private String baseUrl() {
+        try {
+            return staticRoot.getURL().toString();
+        } catch (Exception e) {
+            return null;
+        }
+    }
+}

src/main/java/com/imprimelibros/erp/pdf/PdfService.java

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+package com.imprimelibros.erp.pdf;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class PdfService {
+    private final TemplateRegistry registry;
+    private final PdfTemplateEngine engine;
+    private final PdfRenderer renderer;
+
+    public PdfService(TemplateRegistry registry, PdfTemplateEngine engine, PdfRenderer renderer) {
+        this.registry = registry;
+        this.engine = engine;
+        this.renderer = renderer;
+    }
+
+    public byte[] generate(DocumentSpec spec) {
+        var template = registry.resolve(spec.type(), spec.templateId());
+        if (template == null) {
+            throw new IllegalArgumentException("Plantilla no registrada: " + spec.type() + ":" + spec.templateId());
+        }
+        var html = engine.render(template, spec.locale(), spec.model());
+        return renderer.renderHtmlToPdf(html);
+    }
+}

src/main/java/com/imprimelibros/erp/pdf/PdfTemplateEngine.java

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+package com.imprimelibros.erp.pdf;
+
+import org.thymeleaf.context.Context;
+import org.thymeleaf.spring6.SpringTemplateEngine;
+import org.springframework.stereotype.Service;
+import java.util.Locale;
+import java.util.Map;
+
+@Service
+public class PdfTemplateEngine {
+    private final SpringTemplateEngine thymeleaf;
+
+    public PdfTemplateEngine(SpringTemplateEngine thymeleaf) {
+        this.thymeleaf = thymeleaf;
+    }
+
+    public String render(String templateName, Locale locale, Map<String,Object> model) {
+        Context ctx = new Context(locale);
+        if (model != null) model.forEach(ctx::setVariable);
+        return thymeleaf.process(templateName, ctx);
+    }
+}

src/main/java/com/imprimelibros/erp/pdf/TemplateRegistry.java

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+// com.imprimelibros.erp.pdf.TemplateRegistry.java
+package com.imprimelibros.erp.pdf;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class TemplateRegistry {
+    private final PdfModuleConfig config;
+
+    public TemplateRegistry(PdfModuleConfig config) {
+        this.config = config;
+    }
+
+    public String resolve(DocumentType type, String templateId) {
+        if (config.getTemplates() == null) return null;
+        return config.getTemplates().get(type.name() + ":" + templateId);
+    }
+}