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

package com.imprimelibros.erp.pdf;

import com.openhtmltopdf.outputdevice.helper.BaseRendererBuilder;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.io.ByteArrayOutputStream;

@Service
public class PdfRenderer {

    @Value("classpath:/static/")
    private org.springframework.core.io.Resource staticRoot;

    public byte[] renderHtmlToPdf(String html) {
        try (var baos = new ByteArrayOutputStream()) {
            var builder = new com.openhtmltopdf.pdfboxout.PdfRendererBuilder();
            builder.useFastMode();

            // 👇 Base URL para que pueda resolver /assets/css/ y /img/
            builder.withHtmlContent(html, staticRoot.getURL().toString()); // .../target/classes/static/


            // (Opcional) Registrar fuentes TTF
            builder.useFont(() -> getClass().getResourceAsStream("/static/assets/fonts/OpenSans-Regular.ttf"),
                    "Open Sans", 400, BaseRendererBuilder.FontStyle.NORMAL, true);
            builder.useFont(() -> getClass().getResourceAsStream("/static/assets/fonts/OpenSans-SemiBold.ttf"),
                    "Open Sans", 600, BaseRendererBuilder.FontStyle.NORMAL, true);
            builder.useFont(() -> getClass().getResourceAsStream("/static/assets/fonts/OpenSans-Bold.ttf"),
                    "Open Sans", 700, BaseRendererBuilder.FontStyle.NORMAL, true);

            builder.toStream(baos);
            builder.run();

            return baos.toByteArray();
        } catch (Exception e) {
            throw new IllegalStateException("Error generando PDF", e);
        }
    }
}