From 63adb0ce13807011db1acba5929caedc972600b1 Mon Sep 17 00:00:00 2001
From: Maas Lalani <maas@lalani.dev>
Date: Sun, 11 Jun 2023 19:07:37 -0400
Subject: [PATCH] feat: add pdf.go

---
 pdf.go | 134 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 pdf.go

diff --git a/pdf.go b/pdf.go
new file mode 100644
index 0000000000000000000000000000000000000000..4ffb9c0a2ee0b839281619d851323eef9d65dff3
--- /dev/null
+++ b/pdf.go
@@ -0,0 +1,134 @@
+package main
+
+import (
+	"strconv"
+
+	"github.com/signintech/gopdf"
+)
+
+const quantityColumnOffset = 360
+const rateColumnOffset = 405
+const amountColumnOffset = 480
+
+const (
+	subtotalLabel = "Subtotal"
+	discountLabel = "Discount"
+	taxLabel      = "Tax"
+	totalLabel    = "Total"
+)
+
+func writeLogo(pdf *gopdf.GoPdf, logo string, from string) {
+	if logo != "" {
+		_ = pdf.Image(logo, pdf.GetX(), pdf.GetY(), &gopdf.Rect{W: 44, H: 44})
+		pdf.Br(64)
+	}
+	_ = pdf.SetFont("Inter", "", 12)
+	pdf.SetTextColor(155, 155, 155)
+	_ = pdf.Cell(nil, from)
+	pdf.Br(36)
+	pdf.SetStrokeColor(225, 225, 225)
+	pdf.Line(pdf.GetX(), pdf.GetY(), 100, pdf.GetY())
+	pdf.Br(36)
+}
+
+func writeTitle(pdf *gopdf.GoPdf, title, id string) {
+	_ = pdf.SetFont("Inter", "", 24)
+	pdf.SetTextColor(0, 0, 0)
+	_ = pdf.Cell(nil, title)
+	pdf.Br(36)
+	_ = pdf.SetFont("Inter", "", 12)
+	pdf.SetTextColor(225, 225, 225)
+	_ = pdf.Cell(nil, "#")
+	pdf.SetTextColor(175, 175, 175)
+	_ = pdf.Cell(nil, id)
+	pdf.Br(48)
+}
+
+func writeBillTo(pdf *gopdf.GoPdf, to string) {
+	pdf.SetTextColor(200, 200, 200)
+	_ = pdf.SetFont("Inter", "", 9)
+	_ = pdf.Cell(nil, "BILL TO")
+	pdf.Br(14)
+	pdf.SetTextColor(175, 175, 175)
+	_ = pdf.SetFont("Inter", "", 15)
+	_ = pdf.Cell(nil, to)
+	pdf.Br(64)
+}
+
+func writeHeaderRow(pdf *gopdf.GoPdf) {
+	_ = pdf.SetFont("Inter", "", 9)
+	pdf.SetTextColor(175, 175, 175)
+	_ = pdf.Cell(nil, "ITEM")
+	pdf.SetX(quantityColumnOffset)
+	_ = pdf.Cell(nil, "QTY")
+	pdf.SetX(rateColumnOffset)
+	_ = pdf.Cell(nil, "RATE")
+	pdf.SetX(amountColumnOffset)
+	_ = pdf.Cell(nil, "AMOUNT")
+	pdf.Br(24)
+}
+
+func writeNotes(pdf *gopdf.GoPdf, notes string) {
+	pdf.SetY(650)
+
+	_ = pdf.SetFont("Inter", "", 10)
+	pdf.SetTextColor(155, 155, 155)
+	_ = pdf.Cell(nil, "Notes")
+	pdf.Br(18)
+	pdf.SetTextColor(0, 0, 0)
+	_ = pdf.Cell(nil, notes)
+	pdf.Br(48)
+}
+
+func writeFooter(pdf *gopdf.GoPdf, id string) {
+	pdf.SetY(800)
+
+	_ = pdf.SetFont("Inter", "", 10)
+	pdf.SetTextColor(155, 155, 155)
+	_ = pdf.Cell(nil, id)
+	pdf.SetStrokeColor(225, 225, 225)
+	pdf.Line(pdf.GetX()+10, pdf.GetY()+6, 550, pdf.GetY()+6)
+	pdf.Br(48)
+}
+
+func writeRow(pdf *gopdf.GoPdf, item string, quantity int, rate float64) {
+	_ = pdf.SetFont("Inter", "", 11)
+	pdf.SetTextColor(0, 0, 0)
+
+	total := float64(quantity) * rate
+	amount := strconv.FormatFloat(total, 'f', 2, 64)
+
+	_ = pdf.Cell(nil, item)
+	pdf.SetX(quantityColumnOffset)
+	_ = pdf.Cell(nil, strconv.Itoa(quantity))
+	pdf.SetX(rateColumnOffset)
+	_ = pdf.Cell(nil, currencySymbols[currency]+strconv.FormatFloat(rate, 'f', 2, 64))
+	pdf.SetX(amountColumnOffset)
+	_ = pdf.Cell(nil, currencySymbols[currency]+amount)
+	pdf.Br(24)
+}
+
+func writeTotals(pdf *gopdf.GoPdf, subtotal float64, tax float64, discount float64) {
+	pdf.SetY(650)
+
+	writeTotal(pdf, subtotalLabel, subtotal)
+	if tax > 0 {
+		writeTotal(pdf, taxLabel, tax)
+	}
+	if discount > 0 {
+		writeTotal(pdf, discountLabel, discount)
+	}
+	writeTotal(pdf, totalLabel, subtotal+tax-discount)
+}
+
+func writeTotal(pdf *gopdf.GoPdf, label string, total float64) {
+	_ = pdf.SetFont("Inter", "", 9)
+	pdf.SetTextColor(175, 175, 175)
+	pdf.SetX(rateColumnOffset)
+	_ = pdf.Cell(nil, label)
+	pdf.SetTextColor(0, 0, 0)
+	_ = pdf.SetFontSize(12)
+	pdf.SetX(amountColumnOffset - 15)
+	_ = pdf.Cell(nil, currencySymbols[currency]+strconv.FormatFloat(total, 'f', 2, 64))
+	pdf.Br(24)
+}