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'use server';
import { Invoice } from '@/models/invoice';
import PDFDocument from 'pdfkit';
import blobStream from 'blob-stream';
const MARGIN = 30;
const T_CELL_PADDING = 30;
const T_PADDING = 4;
const T_ROW_HEIGHT = 20;
const createTableHeader = (
doc: PDFKit.PDFDocument,
params: {
itemText: string;
quantityText: string;
rateText: string;
amountText: string;
},
) => {
doc.rect(doc.x, doc.y, doc.page.width - MARGIN * 2, T_ROW_HEIGHT).fill();
doc.fontSize(10).fillColor('white');
doc.text(params.itemText, MARGIN + T_PADDING, doc.y + 6);
doc.moveUp();
doc.text(
params.quantityText,
doc.page.width -
MARGIN -
doc.widthOfString(params.quantityText) -
(doc.widthOfString(params.amountText) + T_CELL_PADDING) -
(doc.widthOfString(params.rateText) + T_CELL_PADDING) -
T_PADDING,
doc.y,
);
doc.moveUp();
doc.text(
params.rateText,
doc.page.width -
MARGIN -
(doc.widthOfString(params.amountText) + T_CELL_PADDING) -
doc.widthOfString(params.rateText) -
T_PADDING,
doc.y,
);
doc.moveUp();
doc.text(
params.amountText,
doc.page.width - MARGIN - doc.widthOfString(params.amountText) - T_PADDING,
doc.y,
);
doc.fontSize(10).fillColor('black');
doc.text('', MARGIN + T_PADDING, doc.y + T_ROW_HEIGHT / 2);
};
export async function generateInvoice(invoice: Invoice): Promise<Blob> {
const doc = new PDFDocument({ size: 'A4', margin: MARGIN });
const stream = doc.pipe(blobStream());
// Invoice from
doc.fontSize(10);
doc.text(invoice.from);
// Invlice number and date
doc.moveUp();
doc.fontSize(12);
const invNumber = '# ' + invoice.invoice_number;
doc.text(invNumber, doc.page.width - MARGIN - doc.widthOfString(invNumber));
if (invoice.date) {
doc.fontSize(10);
const invDate = invoice.date.toLocaleDateString();
doc.text(invDate, doc.page.width - MARGIN - doc.widthOfString(invDate));
}
// Separator
doc.moveTo(MARGIN, doc.y + 5);
doc.lineTo(doc.page.width - MARGIN, doc.y + 5).stroke();
doc.moveDown();
// Invoice title
doc.fontSize(24);
doc.text('INVOICE', MARGIN, doc.y + 3);
doc.moveDown();
// Bill to and details
if (invoice.bill_to) {
doc.fontSize(8);
doc.text('BILL TO');
doc.text(invoice.bill_to);
doc.moveUp(2);
doc.text('', MARGIN + doc.widthOfString('BILL TO') * 3, doc.y);
}
if (invoice.po_number) {
doc.fontSize(8);
doc.text('DETAILS');
doc.text('Po number: ' + invoice.po_number);
doc.text('', MARGIN, doc.y + 10);
} else {
doc.moveDown(2);
doc.text('', MARGIN, doc.y + 10);
}
const params = {
itemText: 'ITEM',
quantityText: 'QUANTITY',
rateText: 'RATE',
amountText: 'AMOUNT',
};
createTableHeader(doc, params);
const amountX = doc.page.width - MARGIN - T_PADDING;
const rateX =
amountX -
doc.widthOfString(params.amountText) -
T_CELL_PADDING -
doc.widthOfString(params.rateText) / 2;
const quantityX =
rateX -
doc.widthOfString(params.rateText) / 2 -
T_CELL_PADDING -
doc.widthOfString(params.quantityText) / 2;
invoice.line_items.forEach((item) => {
const amount = (item.quantity * item.rate).toLocaleString(undefined, {
style: 'currency',
currency: invoice.currency,
});
const quantity = item.quantity.toString();
const rate = item.rate.toLocaleString(undefined, {
style: 'currency',
currency: invoice.currency,
});
doc.text(item.description);
doc.moveUp();
doc.text(amount, amountX - doc.widthOfString(amount), doc.y);
doc.moveUp();
doc.text(rate, rateX - doc.widthOfString(rate) / 2, doc.y);
doc.moveUp();
doc.text(quantity, quantityX - doc.widthOfString(quantity) / 2, doc.y);
doc.text('', MARGIN + T_PADDING, doc.y + T_ROW_HEIGHT / 2);
});
const total = invoice.line_items.reduce(
(acc, cur) => acc + (cur.quantity ?? 0) * (cur.rate ?? 0),
0,
);
const totalText =
'Total: ' +
total.toLocaleString(undefined, {
style: 'currency',
currency: invoice.currency,
});
doc.moveDown(2);
doc.fontSize(12);
doc.text(
totalText,
doc.page.width - MARGIN - T_PADDING - doc.widthOfString(totalText),
);
doc.end();
return new Promise((resolve, reject) => {
stream.on('finish', () => {
const blob = stream.toBlob();
resolve(blob);
});
stream.on('error', reject);
});
}
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