Add automatic invoice parsing to extract purchase items

- Install pdf-parse and tesseract.js for PDF/image processing
- Create /api/admin/parse-invoice endpoint to extract line items from invoices
- Parser extracts quantity and description from invoice text
- Attempts to match extracted items to products in database
- Update PurchaseForm with "Extract items" button
- Pre-fill purchase form with parsed items (user can edit/add more)
- Supports PDF files and image scans (JPG, PNG, etc)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

package-lock.json

@@ -16,10 +16,12 @@
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+        "musl"
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+      "optional": true,
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+    "node_modules/@napi-rs/canvas-win32-x64-msvc": {
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@@ -934,6 +1135,12 @@
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@@ -1502,6 +1709,12 @@
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@@ -1730,6 +1943,26 @@
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@@ -1801,6 +2034,15 @@
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@@ -1808,6 +2050,38 @@
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+      "dependencies": {
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+        "pdfjs-dist": "5.4.296"
+      },
+      "bin": {
+        "pdf-parse": "bin/cli.mjs"
+      },
+      "engines": {
+        "node": ">=20.16.0 <21 || >=22.3.0"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/mehmet-kozan"
+      }
+    },
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+      "license": "Apache-2.0",
+      "engines": {
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+      "optionalDependencies": {
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+      }
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     "node_modules/picocolors": {
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@@ -2116,6 +2390,12 @@
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@@ -2440,6 +2720,30 @@
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+    "node_modules/tesseract.js": {
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+      "hasInstallScript": true,
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+      "dependencies": {
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+        "idb-keyval": "^6.2.0",
+        "is-url": "^1.2.4",
+        "node-fetch": "^2.6.9",
+        "opencollective-postinstall": "^2.0.3",
+        "regenerator-runtime": "^0.13.3",
+        "tesseract.js-core": "^7.0.0",
+        "wasm-feature-detect": "^1.8.0",
+        "zlibjs": "^0.3.1"
+      }
+    },
+    "node_modules/tesseract.js-core": {
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@@ -2524,6 +2828,12 @@
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@@ -2638,6 +2948,28 @@
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@@ -2654,6 +2986,15 @@
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package.json

@@ -19,10 +19,12 @@
     "konva": "9.3.14",
     "next": "14.2.5",
     "nodemailer": "6.9.14",
+    "pdf-parse": "^2.4.5",
     "react": "18.3.1",
     "react-dom": "18.3.1",
     "react-konva": "18.2.10",
     "stripe": "16.2.0",
+    "tesseract.js": "^7.0.0",
     "uuid": "9.0.1",
     "zustand": "4.5.4"
   },

src/app/api/admin/parse-invoice/route.ts

@@ -0,0 +1,124 @@
+import { NextResponse } from 'next/server';
+import { isAdminAuthenticated } from '@/lib/adminAuth';
+import { prisma } from '@/lib/prisma';
+import pdfParse from 'pdf-parse';
+import * as Tesseract from 'tesseract.js';
+
+type ExtractedItem = {
+  description: string;
+  quantity: number;
+  productId?: string;
+};
+
+async function extractTextFromPDF(buffer: Buffer): Promise<string> {
+  try {
+    const data = await pdfParse(buffer);
+    return data.text;
+  } catch (err) {
+    throw new Error('Failed to extract text from PDF');
+  }
+}
+
+async function extractTextFromImage(buffer: Buffer): Promise<string> {
+  try {
+    const result = await Tesseract.recognize(buffer, 'eng');
+    return result.data.text;
+  } catch (err) {
+    throw new Error('Failed to OCR image');
+  }
+}
+
+function parseInvoiceText(text: string, products: any[]): ExtractedItem[] {
+  const items: ExtractedItem[] = [];
+  const lines = text.split('\n');
+
+  // Build product search index (lowercase for matching)
+  const productIndex = new Map(products.map((p) => [p.name.toLowerCase(), p.id]));
+
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (!trimmed || trimmed.length < 5) continue;
+
+    // Look for patterns like: quantity x product or product x quantity
+    // Examples: "10 x T-Shirt", "T-Shirt - 10", "10x hoodies"
+    const matches = trimmed.match(/(\d+)\s*x?\s*(.+?)(?:\s*-\s*£?[\d.]+)?$/i);
+    if (!matches) continue;
+
+    const quantity = parseInt(matches[1], 10);
+    let description = matches[2].trim();
+
+    // Clean up description (remove common noise)
+    description = description.replace(/\s*-\s*\d+\s*$/, ''); // Remove trailing numbers
+    description = description.replace(/£[\d.]+/, '').trim(); // Remove prices
+
+    if (quantity > 0 && description.length > 2) {
+      // Try to match to a product
+      const lowerDesc = description.toLowerCase();
+      let productId: string | undefined;
+
+      for (const [productName, pId] of productIndex) {
+        if (lowerDesc.includes(productName)) {
+          productId = pId;
+          break;
+        }
+      }
+
+      items.push({
+        description,
+        quantity,
+        productId,
+      });
+    }
+  }
+
+  return items;
+}
+
+export async function POST(req: Request) {
+  const isAdmin = await isAdminAuthenticated();
+  if (!isAdmin) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
+  }
+
+  try {
+    const formData = await req.formData();
+    const file = formData.get('invoice') as File;
+
+    if (!file) {
+      return NextResponse.json({ error: 'No file provided' }, { status: 400 });
+    }
+
+    if (file.size > 8 * 1024 * 1024) {
+      return NextResponse.json({ error: 'File too large (max 8MB)' }, { status: 400 });
+    }
+
+    const buffer = Buffer.from(await file.arrayBuffer());
+    let text = '';
+
+    if (file.type === 'application/pdf') {
+      text = await extractTextFromPDF(buffer);
+    } else if (file.type.startsWith('image/')) {
+      text = await extractTextFromImage(buffer);
+    } else {
+      return NextResponse.json(
+        { error: 'Unsupported file type. Use PDF or image.' },
+        { status: 400 }
+      );
+    }
+
+    // Get all products for matching
+    const products = await prisma.product.findMany({
+      select: { id: true, name: true },
+    });
+
+    const extractedItems = parseInvoiceText(text, products);
+
+    return NextResponse.json({
+      items: extractedItems,
+      rawText: text.substring(0, 500), // First 500 chars for debugging
+    });
+  } catch (err) {
+    const message = err instanceof Error ? err.message : 'Unknown error';
+    return NextResponse.json({ error: message }, { status: 500 });
+  }
+}

src/components/PurchaseForm.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useState } from 'react';
+import { useState, useRef } from 'react';
 import { createPurchase } from '@/app/admin/accounts/purchases/actions';
 import Price from './Price';
 
@@ -30,6 +30,9 @@ export default function PurchaseForm({ products }: { products: ProductOption[] }
     { key: 1, productId: '', description: '', color: '', size: '', quantity: 1, unitCostInput: '' },
   ]);
   const [nextKey, setNextKey] = useState(2);
+  const [parsing, setParsing] = useState(false);
+  const [parseError, setParseError] = useState<string | null>(null);
+  const fileInputRef = useRef<HTMLInputElement>(null);
 
   const updateRow = (key: number, patch: Partial<Row>) => {
     setRows((prev) => prev.map((r) => (r.key === key ? { ...r, ...patch } : r)));
@@ -61,6 +64,56 @@ export default function PurchaseForm({ products }: { products: ProductOption[] }
     setRows((prev) => (prev.length > 1 ? prev.filter((r) => r.key !== key) : prev));
   };
 
+  const parseInvoice = async () => {
+    if (!fileInputRef.current?.files?.[0]) {
+      setParseError('No file selected');
+      return;
+    }
+
+    setParsing(true);
+    setParseError(null);
+
+    try {
+      const formData = new FormData();
+      formData.append('invoice', fileInputRef.current.files[0]);
+
+      const res = await fetch('/api/admin/parse-invoice', {
+        method: 'POST',
+        body: formData,
+      });
+
+      const data = await res.json();
+
+      if (!res.ok) {
+        setParseError(data.error || 'Failed to parse invoice');
+        return;
+      }
+
+      if (!data.items || data.items.length === 0) {
+        setParseError('No items found in invoice. Please add them manually.');
+        return;
+      }
+
+      // Convert extracted items to form rows
+      const newRows: Row[] = data.items.map((item: any, index: number) => ({
+        key: nextKey + index,
+        productId: item.productId || '',
+        description: item.description,
+        color: '',
+        size: '',
+        quantity: item.quantity,
+        unitCostInput: '',
+      }));
+
+      setRows(newRows);
+      setNextKey(nextKey + newRows.length);
+    } catch (err) {
+      setParseError(err instanceof Error ? err.message : 'Failed to parse invoice');
+    } finally {
+      setParsing(false);
+    }
+  };
+
   const pence = (input: string) => Math.max(0, Math.round(Number(input || '0') * 100));
   const total = rows.reduce((sum, r) => sum + r.quantity * pence(r.unitCostInput), 0);
 
@@ -113,14 +166,32 @@ export default function PurchaseForm({ products }: { products: ProductOption[] }
         <label htmlFor="invoice" className="tag-label mb-2 block">
           Invoice file (optional)
         </label>
+        <div className="flex gap-2">
           <input
+            ref={fileInputRef}
             id="invoice"
             name="invoice"
             type="file"
             accept="application/pdf,image/*"
-          className="w-full border border-line bg-paper px-3 py-2 text-sm"
+            className="flex-1 border border-line bg-paper px-3 py-2 text-sm"
           />
-        <p className="mt-1 text-xs text-muted">PDF or photo, up to 8 MB — kept with the purchase for your records.</p>
+          <button
+            type="button"
+            onClick={parseInvoice}
+            disabled={parsing}
+            className="border border-ink px-4 py-2 text-sm hover:border-clay hover:bg-clay hover:text-paper disabled:opacity-50"
+          >
+            {parsing ? 'Parsing…' : 'Extract items'}
+          </button>
+        </div>
+        <p className="mt-1 text-xs text-muted">
+          PDF or photo, up to 8 MB. Click "Extract items" to auto-fill line items from the invoice.
+        </p>
+        {parseError && (
+          <p className="mt-2 border border-splash-pink/40 bg-splash-pink/10 px-3 py-2 text-xs text-splash-pink">
+            {parseError}
+          </p>
+        )}
       </div>
 
       <div>