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

src/js/workflow/nodes/add-blank-page-node.ts

@@ -0,0 +1,76 @@
+import { ClassicPreset } from 'rete';
+import { BaseWorkflowNode } from './base-node';
+import { pdfSocket } from '../sockets';
+import type { SocketData } from '../types';
+import { requirePdfInput, processBatch } from '../types';
+import { PDFDocument } from 'pdf-lib';
+
+export class AddBlankPageNode extends BaseWorkflowNode {
+  readonly category = 'Organize & Manage' as const;
+  readonly icon = 'ph-file-plus';
+  readonly description = 'Insert blank pages';
+
+  constructor() {
+    super('Add Blank Page');
+    this.addInput('pdf', new ClassicPreset.Input(pdfSocket, 'PDF'));
+    this.addOutput('pdf', new ClassicPreset.Output(pdfSocket, 'PDF'));
+    this.addControl(
+      'blankPosition',
+      new ClassicPreset.InputControl('text', { initial: 'end' })
+    );
+    this.addControl(
+      'afterPage',
+      new ClassicPreset.InputControl('number', { initial: 1 })
+    );
+    this.addControl(
+      'count',
+      new ClassicPreset.InputControl('number', { initial: 1 })
+    );
+  }
+
+  async data(
+    inputs: Record<string, SocketData[]>
+  ): Promise<Record<string, SocketData>> {
+    const pdfInputs = requirePdfInput(inputs, 'Add Blank Page');
+    const posCtrl = this.controls['blankPosition'] as
+      | ClassicPreset.InputControl<'text'>
+      | undefined;
+    const position = posCtrl?.value || 'end';
+    const afterPageCtrl = this.controls['afterPage'] as
+      | ClassicPreset.InputControl<'number'>
+      | undefined;
+    const afterPage = afterPageCtrl?.value ?? 1;
+    const countCtrl = this.controls['count'] as
+      | ClassicPreset.InputControl<'number'>
+      | undefined;
+    const count = Math.max(1, Math.min(100, countCtrl?.value ?? 1));
+
+    return {
+      pdf: await processBatch(pdfInputs, async (input) => {
+        const pdfDoc = await PDFDocument.load(input.bytes);
+        const firstPage = pdfDoc.getPages()[0];
+        const { width, height } = firstPage
+          ? firstPage.getSize()
+          : { width: 595.28, height: 841.89 };
+        for (let i = 0; i < count; i++) {
+          if (position === 'start') {
+            pdfDoc.insertPage(0, [width, height]);
+          } else if (position === 'after') {
+            const insertAt =
+              Math.min(Math.max(1, afterPage), pdfDoc.getPageCount()) + i;
+            pdfDoc.insertPage(insertAt, [width, height]);
+          } else {
+            pdfDoc.addPage([width, height]);
+          }
+        }
+        const pdfBytes = await pdfDoc.save();
+        return {
+          type: 'pdf',
+          document: pdfDoc,
+          bytes: new Uint8Array(pdfBytes),
+          filename: input.filename.replace(/\.pdf$/i, '_blank.pdf'),
+        };
+      }),
+    };
+  }
+}