billing docs service

api/billing/documents/renderer/header.go

@@ -0,0 +1,50 @@
+package renderer
+
+import (
+	"strings"
+
+	"github.com/jung-kurt/gofpdf"
+)
+
+// Issuer describes the document issuer.
+type Issuer struct {
+	LegalName    string `yaml:"legal_name"`
+	LegalAddress string `yaml:"legal_address"`
+	LogoPath     string `yaml:"logo_path"`
+}
+
+func drawHeader(pdf *gofpdf.Fpdf, issuer Issuer, marginLeft, marginTop float64) (float64, error) {
+	startX := marginLeft
+	startY := marginTop
+	logoWidth := 0.0
+
+	if strings.TrimSpace(issuer.LogoPath) != "" {
+		logoWidth = 24
+		pdf.ImageOptions(issuer.LogoPath, startX, startY, logoWidth, 0, false, gofpdf.ImageOptions{ReadDpi: true}, 0, "")
+	}
+
+	textX := startX
+	if logoWidth > 0 {
+		textX = startX + logoWidth + 6
+	}
+	pdf.SetXY(textX, startY)
+	pdf.SetFont("Helvetica", "B", 12)
+	pdf.CellFormat(0, 5, issuer.LegalName, "", 1, "L", false, 0, "")
+	pdf.SetX(textX)
+	pdf.SetFont("Helvetica", "", 10)
+	pdf.MultiCell(0, 4.5, issuer.LegalAddress, "", "L", false)
+
+	if pdf.Error() != nil {
+		return 0, pdf.Error()
+	}
+
+	currentY := pdf.GetY()
+	if logoWidth > 0 {
+		logoBottom := startY + logoWidth
+		if logoBottom > currentY {
+			currentY = logoBottom
+		}
+	}
+
+	return currentY - startY, nil
+}