Add visual workflow builder, fix critical bugs, and add Arabic i18n support

src/js/workflow/nodes/download-node.ts

@@ -0,0 +1,70 @@
+import { ClassicPreset } from 'rete';
+import { BaseWorkflowNode } from './base-node';
+import { pdfSocket } from '../sockets';
+import type { SocketData } from '../types';
+import { extractAllPdfs } from '../types';
+import { downloadFile } from '../../utils/helpers.js';
+
+export class DownloadNode extends BaseWorkflowNode {
+  readonly category = 'Output' as const;
+  readonly icon = 'ph-download-simple';
+  readonly description = 'Download as PDF or ZIP automatically';
+
+  constructor() {
+    super('Download');
+    this.addInput('pdf', new ClassicPreset.Input(pdfSocket, 'PDF', true));
+    this.addControl(
+      'filename',
+      new ClassicPreset.InputControl('text', {
+        initial: 'output',
+      })
+    );
+  }
+
+  async data(
+    inputs: Record<string, SocketData[]>
+  ): Promise<Record<string, SocketData>> {
+    const allInputs = Object.values(inputs).flat();
+    const allPdfs = extractAllPdfs(allInputs);
+    if (allPdfs.length === 0)
+      throw new Error('No PDFs connected to Download node');
+
+    const filenameControl = this.controls['filename'] as
+      | ClassicPreset.InputControl<'text'>
+      | undefined;
+    const baseName = filenameControl?.value || 'output';
+
+    if (allPdfs.length === 1) {
+      const filename = baseName.toLowerCase().endsWith('.pdf')
+        ? baseName
+        : `${baseName}.pdf`;
+      const blob = new Blob([new Uint8Array(allPdfs[0].bytes)], {
+        type: 'application/pdf',
+      });
+      downloadFile(blob, filename);
+    } else {
+      const JSZip = (await import('jszip')).default;
+      const zip = new JSZip();
+      const usedNames = new Set<string>();
+      for (const pdf of allPdfs) {
+        let name = pdf.filename || 'document.pdf';
+        if (!name.toLowerCase().endsWith('.pdf')) name += '.pdf';
+        let uniqueName = name;
+        let counter = 1;
+        while (usedNames.has(uniqueName)) {
+          uniqueName = name.replace(/\.pdf$/i, `_${counter}.pdf`);
+          counter++;
+        }
+        usedNames.add(uniqueName);
+        zip.file(uniqueName, pdf.bytes);
+      }
+      const zipBlob = await zip.generateAsync({ type: 'blob' });
+      const zipFilename = baseName.toLowerCase().endsWith('.zip')
+        ? baseName
+        : `${baseName}.zip`;
+      downloadFile(zipBlob, zipFilename);
+    }
+
+    return {};
+  }
+}