Add CI/CD GitHub Actions workflow for dev image builds

- Run tests on push/PR to main
- Build and push Docker image to GHCR as :dev and :dev-<sha> on push to main
- Document image pull/run instructions in README

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

.github/workflows/ci-cd.yml

@@ -0,0 +1,85 @@
+name: CI/CD
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: app
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+          cache-dependency-path: app/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+  build-and-push:
+    name: Build and push image (dev)
+    needs: test
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract image metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=dev
+            type=sha,prefix=dev-
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: ./app
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Summary
+        run: |
+          echo "### Dev image published :rocket:" >> "$GITHUB_STEP_SUMMARY"
+          echo "" >> "$GITHUB_STEP_SUMMARY"
+          echo '```' >> "$GITHUB_STEP_SUMMARY"
+          echo "${{ steps.meta.outputs.tags }}" >> "$GITHUB_STEP_SUMMARY"
+          echo '```' >> "$GITHUB_STEP_SUMMARY"

README.md

@@ -20,3 +20,31 @@ docker compose up --build
 Then open `http://localhost:3001` and create an account. PostgreSQL data is kept
 in the `postgres-data` Docker volume, so it survives app and container restarts.
 To remove the database as well, run `docker compose down -v`.
+
+## CI/CD
+
+On every push to `main`, GitHub Actions (`.github/workflows/ci-cd.yml`) runs the
+test suite, then builds and publishes a dev image to the GitHub Container
+Registry:
+
+```
+ghcr.io/odweta/fakturovac:dev
+```
+
+A commit-pinned tag (`ghcr.io/odweta/fakturovac:dev-<short-sha>`) is published
+alongside `:dev` for traceability. Pull requests only run the test job.
+
+To pull and run the latest dev image in a testing environment:
+
+```bash
+docker login ghcr.io -u <your-github-username>   # only needed if the package is private
+docker pull ghcr.io/odweta/fakturovac:dev
+docker run -d -p 3001:3001 \
+  -e DATABASE_URL=postgres://fakturovac:fakturovac@<db-host>:5432/fakturovac \
+  -e NODE_ENV=production \
+  ghcr.io/odweta/fakturovac:dev
+```
+
+The package's visibility (public/private) is managed under the repository's
+**Packages** settings on GitHub; no extra secrets are required since the
+workflow authenticates with the built-in `GITHUB_TOKEN`.

app/src/app.js

@@ -481,7 +481,7 @@ const buildPaymentQrPayload = (payment, total, invoiceNumber = '') => {
     ].filter(Boolean).join('*');
 };
 
-const appendInvoicePdf = async (archive, invoice) => {
+const renderInvoicePdf = async (document, invoice) => {
     const data = invoice.invoice_data || {};
     const supplier = data.supplier || {};
     const customer = data.customer || {};
@@ -492,7 +492,6 @@ const appendInvoicePdf = async (archive, invoice) => {
     const customerName = customer.typSubjektu === 'spolecnost'
         ? customer.nazevSpolecnosti
         : [customer.jmeno, customer.prijmeni].filter(Boolean).join(' ');
-    const document = new PDFDocument({ size: 'A4', margin: 50 });
     const regularFont = '/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf';
     const boldFont = '/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf';
     const qrPayload = buildPaymentQrPayload(payment, data.total, invoice.invoice_number);
@@ -503,12 +502,10 @@ const appendInvoicePdf = async (archive, invoice) => {
     }) : null;
     const pageWidth = document.page.width - document.page.margins.left - document.page.margins.right;
     const navy = '#183b56';
-    const blue = '#2b6f8f';
     const line = '#d8d4cc';
     const lightBlue = '#f4f7fb';
     const warm = '#fffaf0';
     const bodyText = '#17202a';
-    const muted = '#65717d';
     const address = (profile) => [
         profile.uliceCp,
         [profile.psc, profile.mesto].filter(Boolean).join(', ')
@@ -521,7 +518,6 @@ const appendInvoicePdf = async (archive, invoice) => {
     const partyWidth = (pageWidth - 24) / 2;
     const customerX = document.page.margins.left + partyWidth + 24;
 
-    archive.append(document, { name: `${invoice.invoice_number}.pdf` });
     const headerY = document.y;
     document.fillColor(navy).font(boldFont).fontSize(25).text('Faktura', document.page.margins.left, headerY);
     document.fillColor(navy).font(boldFont).fontSize(16).text(invoice.invoice_number, customerX, headerY, {
@@ -590,6 +586,30 @@ const appendInvoicePdf = async (archive, invoice) => {
     document.end();
 };
 
+const appendInvoicePdf = async (archive, invoice) => {
+    const document = new PDFDocument({ size: 'A4', margin: 50 });
+    archive.append(document, { name: `${invoice.invoice_number}.pdf` });
+    await renderInvoicePdf(document, invoice);
+};
+
+app.post('/api/invoices/pdf', requireAuth, async (req, res, next) => {
+    try {
+        const data = normalizeInvoiceData(req.body.data);
+        if (!data) {
+            res.status(400).json({ error: 'Neplatná data faktury.' });
+            return;
+        }
+
+        const invoiceNumber = String(req.body.invoiceNumber || 'Nová faktura').trim() || 'Nová faktura';
+        const document = new PDFDocument({ size: 'A4', margin: 50 });
+        res.attachment(`${invoiceNumber}.pdf`);
+        document.pipe(res);
+        await renderInvoicePdf(document, { invoice_number: invoiceNumber, invoice_data: data });
+    } catch (error) {
+        next(error);
+    }
+});
+
 app.get('/api/invoices/export', requireAuth, async (req, res, next) => {
     try {
         const result = await pool.query(

app/src/static/script.js

@@ -625,8 +625,6 @@ const formatCzechNumber = (value) => Number(value || 0).toLocaleString("cs-CZ",
     maximumFractionDigits: 2
 });
 
-const getTotalValue = () => Number.parseFloat(getValue("total").replace(",", ".")) || 0;
-
 const updateTotal = () => {
     const total = Array.from(itemsContainer.querySelectorAll(".invoice-item"))
         .reduce((sum, item) => {
@@ -638,153 +636,32 @@ const updateTotal = () => {
     document.getElementById("total").textContent = `${formatCzechNumber(total)} Kč`;
 };
 
-const getPersonName = (prefix) => [
+printInvoiceButton.addEventListener("click", async () => {
-    getValue(`${prefix}Jmeno`),
+    try {
-    getValue(`${prefix}Prijmeni`)
+        const response = await fetch("/api/invoices/pdf", {
-].filter(Boolean).join(" ");
+            method: "POST",
+            credentials: "same-origin",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify({
+                data: readInvoiceData(),
+                invoiceNumber: invoiceNumberDisplay.textContent
+            })
+        });
+        if (!response.ok) {
+            const data = await response.json();
+            throw new Error(data.error || "Generování faktury se nepodařilo.");
+        }
 
-const getAddress = (prefix) => [
+        const blob = await response.blob();
-    getValue(`${prefix}UliceCp`),
+        const downloadUrl = URL.createObjectURL(blob);
-    [getValue(`${prefix}Psc`), getValue(`${prefix}Mesto`)].filter(Boolean).join(" ")
+        const link = document.createElement("a");
-].filter(Boolean).join(", ");
+        link.href = downloadUrl;
-
+        link.download = `${invoiceNumberDisplay.textContent}.pdf`;
-const renderPerson = (prefix) => [
+        link.click();
-    ((prefix === "odberatel" && getValue("odberatelTypSubjektu") === "spolecnost")
+        URL.revokeObjectURL(downloadUrl);
-        || (prefix === "dodavatel" && getValue("dodavatelTypSubjektu") === "spolecnost"))
+    } catch (error) {
-        ? getValue(`${prefix}NazevSpolecnosti`)
+        window.alert(error.message);
-        : getPersonName(prefix),
-    getValue(`${prefix}Ico`) ? `IČO: ${getValue(`${prefix}Ico`)}` : "",
-    getAddress(prefix)
-].filter(Boolean).map(escapeHtml).join("<br>");
-
-const renderItems = () => Array.from(itemsContainer.querySelectorAll(".invoice-item"))
-    .map((item) => {
-        const values = Array.from(item.querySelectorAll("input")).map((input) => input.value.trim());
-        return `<tr class="invoice-row">
-            <td>${escapeHtml(values[0])}</td>
-            <td>${escapeHtml(values[1] ? formatCzechNumber(values[1]) : "0,00")}</td>
-            <td>${escapeHtml(values[2])}</td>
-            <td>${escapeHtml(values[3] ? formatCzechNumber(values[3]) : "0,00")} Kč</td>
-        </tr>`;
-    }).join("");
-
-const normalizeIban = (value) => value.replace(/\s+/g, "").toUpperCase();
-
-const domesticAccountToIban = (accountNumber) => {
-    const match = accountNumber.replace(/\s+/g, "")
-        .match(/^(?:(\d{1,6})-)?(\d{1,10})\/(\d{4})$/);
-
-    if (!match) {
-        return "";
     }
-
-    const bban = `${match[3]}${(match[1] || "").padStart(6, "0")}${match[2].padStart(10, "0")}`;
-    const remainder = `${bban}123500`.split("").reduce(
-        (value, digit) => (value * 10 + Number(digit)) % 97,
-        0
-    );
-    const checkDigits = String(98 - remainder).padStart(2, "0");
-
-    return `CZ${checkDigits}${bban}`;
-};
-
-const buildPaymentQrPayload = (accountNumber, iban, swift, total, invoiceNumber = "") => {
-    const preferredAccount = normalizeIban(accountNumber);
-    const fallbackAccount = normalizeIban(iban);
-    const paymentAccount = /^([A-Z]{2})\d{2}[A-Z0-9]{10,32}$/.test(preferredAccount)
-        ? preferredAccount
-        : domesticAccountToIban(accountNumber) || fallbackAccount;
-
-    if (!/^([A-Z]{2})\d{2}[A-Z0-9]{10,32}$/.test(paymentAccount)) {
-        return "";
-    }
-
-    return [
-        "SPD*1.0",
-        `ACC:${paymentAccount}`,
-        `AM:${Number(total || 0).toFixed(2)}`,
-        "CC:CZK",
-        invoiceNumber && `X-VS:${invoiceNumber.replace(/\D/g, "").slice(-10)}`,
-        swift && `X-SWIFT:${normalizeIban(swift)}`
-    ].filter(Boolean).join("*");
-};
-
-const buildInvoiceHtml = () => {
-    const accountNumber = getValue("cisloUctu");
-    const iban = getValue("iban");
-    const swift = getValue("swift");
-    const qrPayload = buildPaymentQrPayload(
-        accountNumber,
-        iban,
-        swift,
-        Number.parseFloat(getValue("total").replace(",", ".")) || 0,
-        invoiceNumberDisplay.textContent
-    );
-    const qrMarkup = qrPayload
-        ? `<img class="qr-code" src="https://api.qrserver.com/v1/create-qr-code/?size=220x220&amp;data=${encodeURIComponent(qrPayload)}" alt="QR kód platebních údajů">`
-        : "<p>Platební QR kód vyžaduje platný IBAN. Číslo účtu bez IBANu nelze bezpečně převést.</p>";
-    const paymentDetails = [
-        accountNumber && `Číslo účtu: ${accountNumber}`,
-        iban && `IBAN: ${iban}`,
-        swift && `SWIFT: ${swift}`
-    ].filter(Boolean).map(escapeHtml).join("<br>");
-
-    return `<!DOCTYPE html>
-<html lang="cs">
-<head>
-    <meta charset="UTF-8">
-    <title>Faktura</title>
-    <style>
-        @page { size: A4; margin: 18mm; }
-        * { box-sizing: border-box; }
-        body { color: #202124; font: 14px Arial, sans-serif; margin: 0; }
-        h1 { font-size: 30px; margin: 0 0 28px; }
-        h2 { font-size: 16px; margin: 0 0 8px; }
-        .parties { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-bottom: 28px; }
-        .party, .payment { border-top: 2px solid #202124; padding-top: 10px; }
-        table { border-collapse: separate; border-spacing: 0; margin-top: 24px; width: 100%; }
-        th, td { padding: 9px 6px; text-align: left; }
-        th { background: #f1f1f1; border-bottom: 1px solid #aeb8c0; }
-        .invoice-row td { border-bottom: 1px solid #c8c8c8; }
-        .invoice-row:nth-child(even) { background: #f4f7fb; }
-        .total { font-size: 18px; font-weight: bold; margin-top: 22px; text-align: right; }
-        .payment-row { align-items: start; display: flex; gap: 28px; justify-content: space-between; margin-top: 36px; }
-        .qr-code { height: 180px; width: 180px; }
-        .qr-placeholder { color: #666; max-width: 220px; }
-        @media print { .qr-placeholder { color: #202124; } }
-    </style>
-</head>
-<body>
-    <h1>Faktura ${escapeHtml(invoiceNumberDisplay.textContent)}</h1>
-    <div class="parties">
-        <section class="party"><h2>Dodavatel</h2>${renderPerson("dodavatel") || "Neuvedeno"}</section>
-        <section class="party"><h2>Odběratel</h2>${renderPerson("odberatel") || "Neuvedeno"}</section>
-    </div>
-    <table>
-        <thead><tr><th>Položka</th><th>Množství</th><th>MJ</th><th>Cena za MJ</th></tr></thead>
-        <tbody>${renderItems() || "<tr><td colspan=\"4\">Žádné položky</td></tr>"}</tbody>
-    </table>
-    <p class="total">Celková částka: ${formatCzechNumber(getTotalValue())} Kč</p>
-    <div class="payment-row">
-        <section class="payment"><h2>Platební údaje</h2>${paymentDetails || "Neuvedeno"}</section>
-        <div class="qr-placeholder">${qrMarkup}</div>
-    </div>
-</body>
-</html>`;
-};
-
-printInvoiceButton.addEventListener("click", () => {
-    const printWindow = window.open("about:blank", "_blank");
-
-    if (!printWindow) {
-        window.alert("Povolte prosím vyskakovací okna pro tisk faktury.");
-        return;
-    }
-
-    printWindow.document.open();
-    printWindow.document.write(buildInvoiceHtml());
-    printWindow.document.close();
-    printWindow.addEventListener("load", () => printWindow.print(), { once: true });
 });
 
 const addInvoiceItem = (values = {}) => {