feat: working invoice generator

go.mod

@@ -1,3 +1,25 @@
-module golang-template
+module github.com/kagchi/invoice-creator
 
 go 1.20
+
+require (
+	github.com/fogleman/gg v1.3.0
+	github.com/gofiber/fiber/v2 v2.50.0
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
+	golang.org/x/image v0.0.0-20200119044424-58c23975cae1
+)
+
+require (
+	github.com/andybalholm/brotli v1.0.6 // indirect
+	github.com/google/uuid v1.3.1 // indirect
+	github.com/klauspost/compress v1.17.1 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.19 // indirect
+	github.com/mattn/go-runewidth v0.0.15 // indirect
+	github.com/rivo/uniseg v0.4.4 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/valyala/fasthttp v1.50.0 // indirect
+	github.com/valyala/tcplisten v1.0.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	golang.org/x/text v0.13.0
+)

go.sum

@@ -0,0 +1,37 @@
+github.com/andybalholm/brotli v1.0.6 h1:Yf9fFpf49Zrxb9NlQaluyE92/+X7UVHlhMNJN2sxfOI=
+github.com/andybalholm/brotli v1.0.6/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
+github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8=
+github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
+github.com/gofiber/fiber/v2 v2.50.0 h1:ia0JaB+uw3GpNSCR5nvC5dsaxXjRU5OEu36aytx+zGw=
+github.com/gofiber/fiber/v2 v2.50.0/go.mod h1:21eytvay9Is7S6z+OgPi7c7n4++tnClWmhpimVHMimw=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/google/uuid v1.3.1 h1:KjJaJ9iWZ3jOFZIf1Lqf4laDRCasjl0BCmnEGxkdLb4=
+github.com/google/uuid v1.3.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/klauspost/compress v1.17.1 h1:NE3C767s2ak2bweCZo3+rdP4U/HoyVXLv/X9f2gPS5g=
+github.com/klauspost/compress v1.17.1/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/mattn/go-isatty v0.0.19 h1:JITubQf0MOLdlGRuRq+jtsDlekdYPia9ZFsB8h/APPA=
+github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
+github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rivo/uniseg v0.4.4 h1:8TfxU8dW6PdqD27gjM8MVNuicgxIjxpm4K7x4jp8sis=
+github.com/rivo/uniseg v0.4.4/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
+github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
+github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
+github.com/valyala/fasthttp v1.50.0 h1:H7fweIlBm0rXLs2q0XbalvJ6r0CUPFWK3/bB4N13e9M=
+github.com/valyala/fasthttp v1.50.0/go.mod h1:k2zXd82h/7UZc3VOdJ2WaUqt1uZ/XpXAfE9i+HBC3lA=
+github.com/valyala/tcplisten v1.0.0 h1:rBHj/Xf+E1tRGZyWIWwJDiRY0zc1Js+CV5DqwacVSA8=
+github.com/valyala/tcplisten v1.0.0/go.mod h1:T0xQ8SeCZGxckz9qRXTfG43PvQ/mcWh7FwZEA7Ioqkc=
+golang.org/x/image v0.0.0-20200119044424-58c23975cae1 h1:5h3ngYt7+vXCDZCup/HkCQgW5XwmSvR/nA2JmJ0RErg=
+golang.org/x/image v0.0.0-20200119044424-58c23975cae1/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=

main.go

@@ -1,5 +1,163 @@
 package main
 
+import (
+	"bytes"
+	"fmt"
+	"log"
+
+	"github.com/fogleman/gg"
+	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/middleware/logger"
+	"github.com/golang/freetype/truetype"
+	"github.com/kagchi/invoice-creator/structs"
+	"golang.org/x/image/font/gofont/goregular"
+	"golang.org/x/text/language"
+	"golang.org/x/text/message"
+)
+
+const (
+	width  = 800  // Width of A4 paper in points (21 cm)
+	height = 841  // Height of A4 paper in points (29.7 cm)
+	margin = 20.0 // Margin in points
+)
+
+func drawString(dc *gg.Context, fontSize float64, s string, x float64, y float64, ax float64, ay float64, width float64, align gg.Align) {
+	font, _ := truetype.Parse(goregular.TTF)
+	face := truetype.NewFace(font, &truetype.Options{
+		Size: fontSize,
+	})
+
+	dc.SetFontFace(face)
+	dc.DrawStringWrapped(s, x, y, ax, ay, width, fontSize, align)
+}
+
+func formatNumberToLocaleString(num int, locale string) string {
+	tags, _, err := language.ParseAcceptLanguage(locale)
+	if err != nil {
+		return fmt.Sprintf("%d", num)
+	}
+
+	var tag language.Tag
+
+	if len(tags) > 0 {
+		tag = tags[0]
+	} else {
+		tag = language.English
+	}
+
+	p := message.NewPrinter(tag)
+
+	return p.Sprintf("%d", num)
+}
+
 func main() {
-	print("鬼を捕まえる準備ができました !")
+	app := fiber.New()
+
+	app.Use(logger.New(logger.Config{
+		Format: "[${ip}]:${port} [${latency}] ${status} - ${method} ${path}\n",
+	}))
+
+	app.Post("/", func(c *fiber.Ctx) error {
+		b := new(structs.Payload)
+
+		if err := c.BodyParser(b); err != nil {
+			return err
+		}
+
+		dc := gg.NewContext(width, height)
+		dc.SetRGB(1, 1, 1)
+		dc.Clear()
+
+		dc.SetRGB(0, 0, 0)
+
+		drawString(dc, 28.0, "INVOICE", margin, margin, 0, 0, float64(width)-4*margin, gg.AlignRight)                  // Title
+		drawString(dc, 16.0, b.Company.Name, margin, 4*margin, 0, 0, float64(width)-4*margin, gg.AlignRight)           // Company Name
+		drawString(dc, 16.0, b.Company.Address.Detail, margin, 5*margin, 0, 0, float64(width)-4*margin, gg.AlignRight) //  Address
+		drawString(dc, 16.0, b.Company.Address.Zip, margin, 6*margin, 0, 0, float64(width)-4*margin, gg.AlignRight)    // Zip Address
+		drawString(dc, 16.0, b.Company.Address.City, margin, 7*margin, 0, 0, float64(width)-4*margin, gg.AlignRight)   // Country
+
+		dc.SetRGB(0, 0, 0)
+		lineY := margin + 20.0 + 10
+		dc.DrawLine(margin+20, lineY*4, width-(margin+20), lineY*4)
+		dc.SetLineWidth(1.0)
+		dc.Stroke()
+
+		drawString(dc, 16.0, b.Client.Name, margin + 20, 11*margin, 0, 0, float64(width)-4*margin, gg.AlignLeft)            // Client Name
+		drawString(dc, 16.0, b.Client.Address.Detail, margin + 20, 12 * margin, 0, 0, float64(width)-4*margin, gg.AlignLeft)  //  Client Address
+		drawString(dc, 16.0, b.Client.Address.Zip, margin + 20, 13 * margin, 0, 0, float64(width)-4*margin, gg.AlignLeft)     // Client Zip Address
+		drawString(dc, 16.0, b.Client.Address.Country, margin + 20, 14 * margin, 0, 0, float64(width)-4*margin, gg.AlignLeft) // Client Country
+
+		drawString(dc, 16.0, fmt.Sprintf("Number : %s", b.Invoice.Number), margin + 20, 11 * margin, 0, 0, float64(width) - 4 * margin, gg.AlignRight)   // Invoice Number
+		drawString(dc, 16.0, fmt.Sprintf("Date  :  %s", b.Invoice.Date), (margin + 20) -87, 12 * margin, 0, 0, float64(width) - 4 * margin, gg.AlignRight)  // Invoice Date
+		drawString(dc, 16.0, fmt.Sprintf("Due Date :  %s", b.Invoice.Due), (margin + 20)-87, 13 * margin, 0, 0, float64(width) - 4 * margin, gg.AlignRight) // Invoice Due Date
+
+		drawString(dc, 16.0, "Products", margin + 20, 18.5 * margin, 0, 0, float64(width) -4 * margin, gg.AlignLeft)
+		drawString(dc, 16.0, "Quantity", margin - 210, 18.5 * margin, 0, 0, float64(width) -4 * margin, gg.AlignRight)
+		drawString(dc, 16.0, "Price", margin - 105, 18.5 * margin, 0, 0, float64(width) - 4 * margin, gg.AlignRight)
+		drawString(dc, 16.0, "Total", margin + 8, 18.5 * margin, 0, 0, float64(width) - 4 * margin, gg.AlignRight)
+
+		dc.DrawLine(margin+20, lineY*8, width-(margin+20), lineY*8)
+		dc.SetLineWidth(1.0)
+		dc.Stroke()
+
+		// TODO: use for const of
+
+		currentMargin := 21.0
+		currentPrice := 0
+		for _, product := range b.Products {
+			drawString(dc, 16.0, product.Name, margin+20, currentMargin * margin, 0, 0, float64(width)-4*margin, gg.AlignLeft)
+
+			quantityStr := fmt.Sprintf("%d", product.Quantity)
+			quantityLen := 0.0
+
+			if len(quantityStr) <= 3 {
+				quantityLen += float64(len(quantityStr)) * 2.7
+			} else {
+				quantityLen += float64(len(quantityStr)) * 3.5
+			}
+
+			drawString(dc, 16.0, quantityStr, margin-(237.5 - quantityLen), currentMargin * margin, 0, 0, float64(width) - 4 * margin, gg.AlignRight) // Quantity
+
+			priceStr := fmt.Sprintf("%d", product.Price)
+			priceLen := 0.0
+
+			if len(priceStr) <= 1 {
+				priceLen += float64(len(quantityStr)) * 14.0
+			} else if len(priceStr) > 1 {
+				priceLen -= float64(len(quantityStr)) * 10
+				priceLen -= float64(len(quantityStr)) * (float64(len(quantityStr)) * 10)
+			}
+
+			drawString(dc, 16.0, fmt.Sprintf("Rp %s", formatNumberToLocaleString(product.Price, b.Setting.Locale)), margin-(107 + priceLen), currentMargin * margin, 0, 0, float64(width) - 4 * margin, gg.AlignRight) // Quantity
+			drawString(dc, 16.0, fmt.Sprintf("Rp %s", formatNumberToLocaleString(product.Price * product.Quantity, b.Setting.Locale)), margin + 20, currentMargin * margin, 0, 0, float64(width) - 4 * margin, gg.AlignRight) // Price
+			currentPrice += product.Price * product.Quantity
+			currentMargin += 1.0
+		}
+
+		lineY = currentMargin + 20.0 + 10.0 + float64(len(b.Products)) - 2.0
+		dc.DrawLine(margin + 20, lineY * 9.5, width - (margin + 20), lineY * 9.5) 
+		dc.SetLineWidth(1.0)
+		dc.Stroke()
+
+		drawString(dc, 16.0, fmt.Sprintf("Sub Total : %s %s", b.Setting.Currency, formatNumberToLocaleString(currentPrice, b.Setting.Locale)), margin+20, (currentMargin + 6.5) * margin, 0, 0, float64(width) - 4 * margin, gg.AlignRight)                        // Subtotal\
+		drawString(dc, 16.0, fmt.Sprintf("Vat %.2f%% :     %s %s", b.Setting.Vat, b.Setting.Currency, formatNumberToLocaleString(int(float64((currentPrice)) * (b.Setting.Vat / 100)), b.Setting.Locale)), margin + 20, (currentMargin + 7.5) * margin, 0, 0, float64(width)-4*margin, gg.AlignRight) // Subtotal
+
+		currentMargin += 1.5
+		lineY = currentMargin + 20.0 + 10.0 + (float64(len(b.Products)) - 2.0) + 12.5
+		dc.DrawLine(margin + 440, lineY * 9.5, width - (margin + 20), lineY * 9.5)
+		dc.SetLineWidth(1.0)
+		dc.Stroke()
+
+
+		drawString(dc, 16.0, fmt.Sprintf("Total :   %s %s", b.Setting.Currency, formatNumberToLocaleString(int(float64(currentPrice) * (b.Setting.Vat / 100)) + currentPrice, b.Setting.Locale)), margin + 20, (currentMargin + 7.5) * margin, 0, 0, float64(width) - 4 * margin, gg.AlignRight) // Subtotal
+
+		var buf bytes.Buffer
+		_ = dc.EncodePNG(&buf)
+
+		c.Set("Content-Type", "image/png")
+
+		return c.Send(buf.Bytes())
+	})
+
+	log.Fatal(app.Listen(":3000"))
 }

structs/main.go

@@ -0,0 +1,39 @@
+package structs
+
+type AddressPayload struct {
+	Zip     string `json:"zip"`
+	City    string `json:"city"`
+	Country string `json:"country"`
+	Detail  string `json:"detail"`
+}
+
+type Profile struct {
+	Name    string `json:"name"`
+	Address AddressPayload `json:"address"`
+}
+
+type Invoice struct {
+	Number string `json:"number"`
+	Date   string `json:"date"`
+	Due    string `json:"due"`
+}
+
+type Setting struct {
+	Currency string  `json:"currency"`
+	Vat 	 float64 `json:"vat"`
+	Locale   string  `json:"locale"`
+}
+
+type Product struct {
+	Name     string `json:"name"`
+	Price    int `json:"price"`
+	Quantity int `json:"quantity"`
+}
+
+type Payload struct {
+	Invoice  Invoice  `json:"Invoice"`
+	Company  Profile `json:"company"`
+	Client   Profile `json:"client"`
+	Setting	 Setting `json:"setting"`
+	Products []Product  `json:"products"`
+}