356 lines
11 KiB
TypeScript
356 lines
11 KiB
TypeScript
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/**
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* Invoice extraction using Ministral 3 Vision (Direct)
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*
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* NO PaddleOCR needed - Ministral 3 has built-in vision encoder:
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* 1. Convert PDF to images
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* 2. Send images directly to Ministral 3 via Ollama
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* 3. Extract structured JSON with native schema support
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*
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* This is the simplest possible pipeline.
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*/
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import { tap, expect } from '@git.zone/tstest/tapbundle';
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import * as fs from 'fs';
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import * as path from 'path';
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import { execSync } from 'child_process';
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import * as os from 'os';
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import { ensureMinistral3 } from './helpers/docker.js';
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const OLLAMA_URL = 'http://localhost:11434';
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const VISION_MODEL = 'ministral-3:8b';
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interface IInvoice {
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invoice_number: string;
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invoice_date: string;
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vendor_name: string;
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currency: string;
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net_amount: number;
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vat_amount: number;
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total_amount: number;
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}
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/**
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* Convert PDF to PNG images using ImageMagick
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*/
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function convertPdfToImages(pdfPath: string): string[] {
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const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pdf-convert-'));
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const outputPattern = path.join(tempDir, 'page-%d.png');
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try {
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execSync(
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`convert -density 200 -quality 90 "${pdfPath}" -background white -alpha remove "${outputPattern}"`,
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{ stdio: 'pipe' }
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);
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const files = fs.readdirSync(tempDir).filter((f) => f.endsWith('.png')).sort();
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const images: string[] = [];
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for (const file of files) {
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const imagePath = path.join(tempDir, file);
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const imageData = fs.readFileSync(imagePath);
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images.push(imageData.toString('base64'));
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}
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return images;
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} finally {
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fs.rmSync(tempDir, { recursive: true, force: true });
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}
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}
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/**
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* Extract invoice data directly from images using Ministral 3 Vision
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*/
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async function extractInvoiceFromImages(images: string[]): Promise<IInvoice> {
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console.log(` [Vision] Processing ${images.length} page(s) with Ministral 3`);
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// JSON schema for structured output
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const invoiceSchema = {
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type: 'object',
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properties: {
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invoice_number: { type: 'string' },
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invoice_date: { type: 'string' },
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vendor_name: { type: 'string' },
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currency: { type: 'string' },
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net_amount: { type: 'number' },
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vat_amount: { type: 'number' },
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total_amount: { type: 'number' },
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},
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required: ['invoice_number', 'invoice_date', 'vendor_name', 'currency', 'net_amount', 'vat_amount', 'total_amount'],
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};
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const prompt = `Extract invoice data from this document image(s).
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Find and return:
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- invoice_number: The invoice number/ID (look for "Invoice No", "Invoice #", "Rechnung Nr")
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- invoice_date: The invoice date in YYYY-MM-DD format
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- vendor_name: The company issuing the invoice (in letterhead)
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- currency: EUR, USD, or GBP
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- total_amount: The FINAL total amount due
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- net_amount: Amount before VAT/tax
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- vat_amount: VAT/tax amount
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Return ONLY valid JSON.`;
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const response = await fetch(`${OLLAMA_URL}/api/chat`, {
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method: 'POST',
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headers: { 'Content-Type': 'application/json' },
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body: JSON.stringify({
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model: VISION_MODEL,
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messages: [
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{
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role: 'user',
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content: prompt,
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images: images, // Send all page images
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},
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],
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format: invoiceSchema,
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stream: true,
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options: {
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num_predict: 512,
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temperature: 0.0,
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},
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}),
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});
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if (!response.ok) {
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throw new Error(`Ollama API error: ${response.status}`);
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}
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const reader = response.body?.getReader();
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if (!reader) {
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throw new Error('No response body');
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}
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const decoder = new TextDecoder();
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let fullText = '';
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while (true) {
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const { done, value } = await reader.read();
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if (done) break;
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const chunk = decoder.decode(value, { stream: true });
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const lines = chunk.split('\n').filter((l) => l.trim());
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for (const line of lines) {
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try {
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const json = JSON.parse(line);
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if (json.message?.content) {
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fullText += json.message.content;
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}
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} catch {
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// Skip invalid JSON lines
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}
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}
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}
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// Parse JSON response
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let jsonStr = fullText.trim();
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if (jsonStr.startsWith('```json')) jsonStr = jsonStr.slice(7);
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else if (jsonStr.startsWith('```')) jsonStr = jsonStr.slice(3);
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if (jsonStr.endsWith('```')) jsonStr = jsonStr.slice(0, -3);
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jsonStr = jsonStr.trim();
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const startIdx = jsonStr.indexOf('{');
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const endIdx = jsonStr.lastIndexOf('}') + 1;
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if (startIdx < 0 || endIdx <= startIdx) {
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throw new Error(`No JSON found: ${fullText.substring(0, 200)}`);
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}
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const parsed = JSON.parse(jsonStr.substring(startIdx, endIdx));
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return {
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invoice_number: parsed.invoice_number || null,
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invoice_date: parsed.invoice_date || null,
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vendor_name: parsed.vendor_name || null,
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currency: parsed.currency || 'EUR',
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net_amount: parseFloat(parsed.net_amount) || 0,
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vat_amount: parseFloat(parsed.vat_amount) || 0,
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total_amount: parseFloat(parsed.total_amount) || 0,
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};
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}
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/**
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* Extract with consensus voting (2 agreeing passes)
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*/
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async function extractWithConsensus(images: string[], name: string, maxPasses: number = 3): Promise<IInvoice> {
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const results: Array<{ invoice: IInvoice; hash: string }> = [];
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const hashCounts: Map<string, number> = new Map();
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for (let pass = 1; pass <= maxPasses; pass++) {
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try {
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const invoice = await extractInvoiceFromImages(images);
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const hash = `${invoice.invoice_number}|${invoice.invoice_date}|${invoice.total_amount?.toFixed(2)}`;
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results.push({ invoice, hash });
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hashCounts.set(hash, (hashCounts.get(hash) || 0) + 1);
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console.log(` [Pass ${pass}] ${invoice.invoice_number} | ${invoice.invoice_date} | ${invoice.total_amount} ${invoice.currency}`);
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if (hashCounts.get(hash)! >= 2) {
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console.log(` [Consensus] Reached after ${pass} passes`);
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return invoice;
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}
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} catch (err) {
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console.log(` [Pass ${pass}] Error: ${err}`);
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}
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}
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// Return most common result
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let bestHash = '';
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let bestCount = 0;
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for (const [hash, count] of hashCounts) {
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if (count > bestCount) {
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bestCount = count;
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bestHash = hash;
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}
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}
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if (!bestHash) throw new Error(`No valid results for ${name}`);
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console.log(` [No consensus] Using best result (${bestCount}/${maxPasses})`);
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return results.find((r) => r.hash === bestHash)!.invoice;
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}
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/**
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* Normalize date to YYYY-MM-DD
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*/
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function normalizeDate(dateStr: string | null): string {
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if (!dateStr) return '';
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if (/^\d{4}-\d{2}-\d{2}$/.test(dateStr)) return dateStr;
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const monthMap: Record<string, string> = {
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JAN: '01', FEB: '02', MAR: '03', APR: '04', MAY: '05', JUN: '06',
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JUL: '07', AUG: '08', SEP: '09', OCT: '10', NOV: '11', DEC: '12',
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};
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let match = dateStr.match(/^(\d{1,2})-([A-Z]{3})-(\d{4})$/i);
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if (match) {
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return `${match[3]}-${monthMap[match[2].toUpperCase()] || '01'}-${match[1].padStart(2, '0')}`;
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}
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match = dateStr.match(/^(\d{1,2})[\/.](\d{1,2})[\/.](\d{4})$/);
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if (match) {
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return `${match[3]}-${match[2].padStart(2, '0')}-${match[1].padStart(2, '0')}`;
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}
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return dateStr;
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}
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/**
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* Compare extracted vs expected
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*/
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function compareInvoice(extracted: IInvoice, expected: IInvoice): { match: boolean; errors: string[] } {
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const errors: string[] = [];
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const extNum = extracted.invoice_number?.replace(/\s/g, '').toLowerCase() || '';
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const expNum = expected.invoice_number?.replace(/\s/g, '').toLowerCase() || '';
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if (extNum !== expNum) {
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errors.push(`invoice_number: expected "${expected.invoice_number}", got "${extracted.invoice_number}"`);
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}
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if (normalizeDate(extracted.invoice_date) !== normalizeDate(expected.invoice_date)) {
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errors.push(`invoice_date: expected "${expected.invoice_date}", got "${extracted.invoice_date}"`);
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}
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if (Math.abs(extracted.total_amount - expected.total_amount) > 0.02) {
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errors.push(`total_amount: expected ${expected.total_amount}, got ${extracted.total_amount}`);
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}
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if (extracted.currency?.toUpperCase() !== expected.currency?.toUpperCase()) {
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errors.push(`currency: expected "${expected.currency}", got "${extracted.currency}"`);
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}
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return { match: errors.length === 0, errors };
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}
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/**
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* Find test cases
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*/
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function findTestCases(): Array<{ name: string; pdfPath: string; jsonPath: string }> {
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const testDir = path.join(process.cwd(), '.nogit/invoices');
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if (!fs.existsSync(testDir)) return [];
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const files = fs.readdirSync(testDir);
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const testCases: Array<{ name: string; pdfPath: string; jsonPath: string }> = [];
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for (const pdf of files.filter((f) => f.endsWith('.pdf'))) {
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const baseName = pdf.replace('.pdf', '');
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const jsonFile = `${baseName}.json`;
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if (files.includes(jsonFile)) {
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testCases.push({
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name: baseName,
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pdfPath: path.join(testDir, pdf),
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jsonPath: path.join(testDir, jsonFile),
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});
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}
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}
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return testCases.sort((a, b) => a.name.localeCompare(b.name));
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}
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// Tests
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tap.test('setup: ensure Ministral 3 is running', async () => {
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console.log('\n[Setup] Checking Ministral 3...\n');
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const ok = await ensureMinistral3();
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expect(ok).toBeTrue();
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console.log('\n[Setup] Ready!\n');
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});
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const testCases = findTestCases();
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console.log(`\nFound ${testCases.length} invoice test cases (Ministral 3 Vision Direct)\n`);
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let passedCount = 0;
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let failedCount = 0;
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const times: number[] = [];
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for (const testCase of testCases) {
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tap.test(`should extract invoice: ${testCase.name}`, async () => {
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const expected: IInvoice = JSON.parse(fs.readFileSync(testCase.jsonPath, 'utf-8'));
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console.log(`\n=== ${testCase.name} ===`);
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console.log(`Expected: ${expected.invoice_number} | ${expected.invoice_date} | ${expected.total_amount} ${expected.currency}`);
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const start = Date.now();
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const images = convertPdfToImages(testCase.pdfPath);
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console.log(` Pages: ${images.length}`);
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const extracted = await extractWithConsensus(images, testCase.name);
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const elapsed = Date.now() - start;
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times.push(elapsed);
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const result = compareInvoice(extracted, expected);
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if (result.match) {
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passedCount++;
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console.log(` Result: MATCH (${(elapsed / 1000).toFixed(1)}s)`);
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} else {
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failedCount++;
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console.log(` Result: MISMATCH (${(elapsed / 1000).toFixed(1)}s)`);
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result.errors.forEach((e) => console.log(` - ${e}`));
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}
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expect(result.match).toBeTrue();
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});
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}
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tap.test('summary', async () => {
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const total = testCases.length;
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const accuracy = total > 0 ? (passedCount / total) * 100 : 0;
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const totalTime = times.reduce((a, b) => a + b, 0) / 1000;
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const avgTime = times.length > 0 ? totalTime / times.length : 0;
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console.log(`\n======================================================`);
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console.log(` Invoice Extraction Summary (Ministral 3 Vision)`);
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console.log(`======================================================`);
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console.log(` Method: Ministral 3 8B Vision (Direct)`);
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console.log(` Passed: ${passedCount}/${total}`);
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console.log(` Failed: ${failedCount}/${total}`);
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console.log(` Accuracy: ${accuracy.toFixed(1)}%`);
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console.log(`------------------------------------------------------`);
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console.log(` Total time: ${totalTime.toFixed(1)}s`);
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console.log(` Avg per inv: ${avgTime.toFixed(1)}s`);
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console.log(`======================================================\n`);
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});
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export default tap.start();
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