2026-01-22 15:15:23 +00:00
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import { Injectable } from '@nestjs/common';
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import { PrintDataDto } from '../dto/print-data.dto';
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import { PrintHtmlDto } from '../dto/print-html.dto';
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const { ThermalPrinter, PrinterTypes } = require('node-thermal-printer');
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@Injectable()
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export class ListPrinterService {
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private readonly printerType = PrinterTypes.EPSON;
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async printReceipt(data: PrintDataDto): Promise<{ success: boolean; message: string }> {
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if (!data.lines?.length) {
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return { success: false, message: 'No lines provided' };
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}
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try {
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let printerInterface = data.printerInterface;
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if (printerInterface && !printerInterface.includes('://') && !printerInterface.startsWith('printer:')) {
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printerInterface = `printer:${printerInterface}`;
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}
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const printer = new ThermalPrinter({
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type: this.printerType,
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interface: printerInterface,
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});
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this.applyAlignment(printer, data.alignment);
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for (const line of data.lines) {
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if (data.upsideDown) {
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printer.upsideDown(true);
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}
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printer.println(line);
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if (data.upsideDown) {
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printer.upsideDown(false);
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}
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}
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printer.drawLine();
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printer.beep();
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await printer.execute();
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return { success: true, message: 'Print successful!' };
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} catch (error) {
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return {
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success: false,
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message: `Print failed: ${error.message || error}`
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};
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}
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}
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private applyAlignment(printer: any, alignment?: string): void {
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if (alignment === 'center') {
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return printer.alignCenter();
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}
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if (alignment === 'right') {
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return printer.alignRight();
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}
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return printer.alignLeft();
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}
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async printHtml(data: PrintHtmlDto): Promise<{ success: boolean; message: string }> {
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const puppeteer = require('puppeteer');
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const pdfPrinter = require('pdf-to-printer');
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const path = require('path');
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const fs = require('fs');
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const os = require('os');
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const tempFilePath = path.join(os.tmpdir(), `print-${Date.now()}.pdf`);
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try {
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const browser = await puppeteer.launch({ headless: true });
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const page = await browser.newPage();
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const width = data.width || '80mm';
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const height = data.height;
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const fullHtml = `
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<script src="https://cdn.tailwindcss.com"></script>
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<style>
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2026-01-22 18:57:45 +00:00
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html, body { margin: 0; padding: 0; }
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body { zoom: 1.4; transform-origin: top left; }
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2026-01-22 15:15:23 +00:00
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@page { size: ${width} ${height || 'auto'}; margin: 0; }
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</style>
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</head>
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<body>
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${data.html}
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</body>
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</html>
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`;
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await page.setContent(fullHtml, { waitUntil: 'networkidle0' });
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const pdfOptions: any = {
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path: tempFilePath,
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printBackground: true,
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width: width,
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margin: { top: '0px', right: '0px', bottom: '0px', left: '0px' }
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};
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if (height) {
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pdfOptions.height = height;
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}
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await page.pdf(pdfOptions);
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await browser.close();
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2026-01-22 18:57:45 +00:00
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await pdfPrinter.print(tempFilePath, {
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printer: data.printerName,
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win32: ['-nointterrupt'] // Tenta evitar comandos extras, mas o pdf-to-printer tem opções limitadas de corte.
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// Na verdade, o pdf-to-printer usa SumatraPDF, que não tem flag explícita de "no-cut".
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// O corte geralmente é configuração do driver ou do tamanho do papel.
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// Mas vamos garantir que não estamos enviando nada extra.
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});
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2026-01-22 15:15:23 +00:00
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return { success: true, message: 'HTML convertido (com Tailwind) e enviado para impressão!' };
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} catch (error) {
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console.error('Erro na impressão HTML:', error);
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return { success: false, message: `Erro ao imprimir HTML: ${error.message}` };
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} finally {
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try {
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if (fs.existsSync(tempFilePath)) {
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fs.unlinkSync(tempFilePath);
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}
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} catch (e) {
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console.warn('Não foi possível deletar arquivo temp:', e);
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}
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}
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}
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}
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