merge files inital commit

src/merge/mergeQueueHelpers.ts

@@ -0,0 +1,86 @@
+import type { PdfFile } from '../pdf/pdfTypes';
+import type { MergeMode, MergeQueueItem } from './mergeTypes';
+
+export function createMergeQueueItemId(): string {
+  return `merge_${Math.random().toString(36).slice(2)}`;
+}
+
+export function moveMergeQueueItem(
+  items: MergeQueueItem[],
+  itemId: string,
+  direction: 'up' | 'down'
+): MergeQueueItem[] {
+  const index = items.findIndex((item) => item.id === itemId);
+  if (index < 0) return items;
+
+  const targetIndex = direction === 'up' ? index - 1 : index + 1;
+  if (targetIndex < 0 || targetIndex >= items.length) return items;
+
+  const next = [...items];
+  const [item] = next.splice(index, 1);
+  next.splice(targetIndex, 0, item);
+  return next;
+}
+
+export function getReadyMergeQueuePdfs(items: MergeQueueItem[]): PdfFile[] {
+  return items
+    .filter((item) => item.status === 'ready' && item.pdf)
+    .map((item) => item.pdf as PdfFile);
+}
+
+export function canMergeQueue(items: MergeQueueItem[]): boolean {
+  return (
+    items.length > 0 &&
+    items.every((item) => item.status === 'ready' && item.pdf !== null)
+  );
+}
+
+export function hasMergeQueueErrors(items: MergeQueueItem[]): boolean {
+  return items.some((item) => item.status === 'error');
+}
+
+export function isMergeQueueLoading(items: MergeQueueItem[]): boolean {
+  return items.some((item) => item.status === 'loading');
+}
+
+export function clampMergeInsertAt(value: string, pageCount: number): number {
+  const parsed = Number.parseInt(value, 10);
+  if (!Number.isFinite(parsed)) return pageCount;
+
+  return Math.min(Math.max(parsed - 1, 0), pageCount);
+}
+
+export function defaultMergeInsertPosition(pageCount: number): string {
+  return String(pageCount + 1);
+}
+
+export function createMergedPdfName(
+  currentPdfName: string | null,
+  incomingPdfNames: string[],
+  mode: MergeMode
+): string {
+  const incomingBaseNames = incomingPdfNames.map(stripPdfExtension);
+
+  if (incomingBaseNames.length === 0) {
+    return currentPdfName ?? 'merged.pdf';
+  }
+
+  if (
+    incomingBaseNames.length === 1 &&
+    (!currentPdfName || mode === 'overwrite')
+  ) {
+    return `${incomingBaseNames[0]}_merged.pdf`;
+  }
+
+  if (currentPdfName && mode !== 'overwrite') {
+    const currentBaseName = stripPdfExtension(currentPdfName);
+    return `${currentBaseName}_plus_${incomingBaseNames.length}_pdfs.pdf`;
+  }
+
+  return `merged_${incomingBaseNames.length}_pdfs.pdf`;
+}
+
+function stripPdfExtension(filename: string): string {
+  const base = filename.replace(/\.pdf$/i, '').trim();
+  return base || 'document';
+}