Reserve invoice QR code space

backend/src/utils/pdf.ts

@@ -128,6 +128,15 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
         const fontBold = await pdfDoc.embedFont(StandardFonts.HelveticaBold)
         const paymentQrCodeBuffer = await getPaymentQrCodeBuffer(invoiceData)
         const paymentQrCode = paymentQrCodeBuffer ? await pdfDoc.embedPng(paymentQrCodeBuffer) : null
+        const mm = 2.83
+        const paymentQrLayout = {
+            sizeMm: 32,
+            rightMarginMm: 20,
+            bottomMarginMm: 40,
+            labelGapMm: 5,
+            labelHeightMm: 4,
+            safeGapMm: 5,
+        }
 
         let pages = []
         let pageCounter = 1
@@ -139,6 +148,85 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
         const firstPageBackground = await pdfDoc.embedPage(backgroudPdf.getPages()[0])
         const secondPageBackground = await pdfDoc.embedPage(backgroudPdf.getPages()[backgroudPdf.getPages().length > 1 ? 1 : 0])
 
+        const drawFoldMarks = (page: any, lengthMm: number) => {
+            page.drawLine({
+                start: getCoordinatesForPDFLib(0, 105, page),
+                end: getCoordinatesForPDFLib(lengthMm, 105, page),
+                thickness: 0.25,
+                color: rgb(0, 0, 0),
+                opacity: 1
+            })
+
+            page.drawLine({
+                start: getCoordinatesForPDFLib(0, 148.5, page),
+                end: getCoordinatesForPDFLib(lengthMm, 148.5, page),
+                thickness: 0.25,
+                color: rgb(0, 0, 0),
+                opacity: 1
+            })
+
+            page.drawLine({
+                start: getCoordinatesForPDFLib(0, 210, page),
+                end: getCoordinatesForPDFLib(lengthMm, 210, page),
+                thickness: 0.25,
+                color: rgb(0, 0, 0),
+                opacity: 1
+            })
+        }
+
+        const addFinalContinuationPage = () => {
+            const page = pdfDoc.addPage()
+
+            page.drawPage(secondPageBackground, {
+                x: 0,
+                y: 0,
+            })
+
+            drawFoldMarks(page, 7)
+
+            pageCounter += 1
+            pageIndex = 0
+            pages.push(page)
+
+            return page
+        }
+
+        const getPaymentQrReservedTopMm = (page: any) => {
+            return page.getHeight() / mm
+                - paymentQrLayout.bottomMarginMm
+                - paymentQrLayout.sizeMm
+                - paymentQrLayout.labelGapMm
+                - paymentQrLayout.labelHeightMm
+                - paymentQrLayout.safeGapMm
+        }
+
+        const getTextLineCount = (text: any, maxSplitLength: number) => {
+            return String(text || "")
+                .split(/\r?\n/)
+                .reduce((sum, line) => sum + Math.max(1, splitStringBySpace(line, maxSplitLength).length), 0)
+        }
+
+        const getFinalBlockEndMm = (startRowHeight: number) => {
+            let estimatedRowHeight = startRowHeight + 6
+            const titleSumKeys = Object.keys(invoiceData.total.titleSums || {})
+
+            titleSumKeys.forEach((key) => {
+                estimatedRowHeight += splitStringBySpace(key, 60).length * 5
+            })
+
+            if (titleSumKeys.length > 0) estimatedRowHeight += 5
+
+            const totalArrayLength = invoiceData.totalArray.length
+            const totalArrayBottom = estimatedRowHeight + Math.max(0, totalArrayLength - 1) * 8 + 6
+            const taxNoteBottom = ["13b UStG", "19 UStG", "12.3 UStG"].includes(invoiceData.taxType)
+                ? estimatedRowHeight + totalArrayLength * 8 + 6
+                : estimatedRowHeight
+            const endTextTop = estimatedRowHeight + endTextDiff + (totalArrayLength - 3) * 8
+            const endTextBottom = endTextTop + getTextLineCount(invoiceData.endText, 85) * 5
+
+            return Math.max(totalArrayBottom, taxNoteBottom, endTextBottom)
+        }
+
         //
         const page1 = pdfDoc.addPage()
 
@@ -862,6 +950,11 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
         let endTextDiff = 35
 
         if (!deliveryNoteLikeDocumentTypes.includes(invoiceData.type)) {
+            if (paymentQrCode && getFinalBlockEndMm(rowHeight) > getPaymentQrReservedTopMm(pages[pageCounter - 1])) {
+                addFinalContinuationPage()
+                rowHeight = 30
+            }
+
             pages[pageCounter - 1].drawLine({
                 start: getCoordinatesForPDFLib(20, rowHeight, page1),
                 end: getCoordinatesForPDFLib(198, rowHeight, page1),
@@ -987,11 +1080,10 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
 
         if (paymentQrCode) {
             const lastPage = pages[pages.length - 1]
-            const mm = 2.83
+            const qrSize = paymentQrLayout.sizeMm * mm
-            const qrSize = 32 * mm
+            const rightMargin = paymentQrLayout.rightMarginMm * mm
-            const rightMargin = 20 * mm
+            const bottomMargin = paymentQrLayout.bottomMarginMm * mm
-            const bottomMargin = 40 * mm
+            const labelGap = paymentQrLayout.labelGapMm * mm
-            const labelGap = 5 * mm
             const qrX = lastPage.getWidth() - rightMargin - qrSize
             const qrY = bottomMargin