refactor: restructure in entirety
This commit is contained in:
Arkaprabha Chakraborty
436
internal/handler/billing.go
Normal file
436
internal/handler/billing.go
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@@ -0,0 +1,436 @@
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package handler
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import "billit/internal/models"
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import "billit/internal/view"
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import (
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"billit/internal/database"
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"billit/internal/logic"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"math"
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"net/http"
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"strconv"
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"strings"
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"github.com/google/uuid"
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"github.com/labstack/echo/v4"
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qrcode "github.com/skip2/go-qrcode"
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)
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// numberToWords converts a number to Indian English words (supports up to crores)
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func numberToWords(n float64) string {
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if n == 0 {
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return "Zero"
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}
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ones := []string{"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine",
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"Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"}
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tens := []string{"", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"}
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convertLessThanHundred := func(n int) string {
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if n < 20 {
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return ones[n]
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}
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if n%10 == 0 {
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return tens[n/10]
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}
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return tens[n/10] + " " + ones[n%10]
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}
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convertLessThanThousand := func(n int) string {
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if n < 100 {
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return convertLessThanHundred(n)
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}
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if n%100 == 0 {
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return ones[n/100] + " Hundred"
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}
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return ones[n/100] + " Hundred " + convertLessThanHundred(n%100)
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}
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// Split into rupees and paise
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rupees := int(math.Floor(n))
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paise := int(math.Round((n - float64(rupees)) * 100))
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var result string
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if rupees >= 10000000 { // Crores
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crores := rupees / 10000000
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rupees = rupees % 10000000
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result += convertLessThanThousand(crores) + " Crore "
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}
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if rupees >= 100000 { // Lakhs
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lakhs := rupees / 100000
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rupees = rupees % 100000
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result += convertLessThanHundred(lakhs) + " Lakh "
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}
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if rupees >= 1000 { // Thousands
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thousands := rupees / 1000
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rupees = rupees % 1000
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result += convertLessThanHundred(thousands) + " Thousand "
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}
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if rupees > 0 {
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result += convertLessThanThousand(rupees)
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}
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result = strings.TrimSpace(result)
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if result == "" {
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result = "Zero"
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}
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result += " Rupees"
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if paise > 0 {
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result += " and " + convertLessThanHundred(paise) + " Paise"
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}
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return result + " Only"
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}
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// BillingHandlers holds db reference for billing operations
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type BillingHandlers struct {
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db database.Service
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}
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// NewBillingHandlers creates handlers with db access
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func NewBillingHandlers(db database.Service) *BillingHandlers {
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return &BillingHandlers{db: db}
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}
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// BillingPageHandler renders the /billing page for creating bills
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func (h *BillingHandlers) BillingPageHandler(c echo.Context) error {
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userID := getUserID(c)
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products, err := h.db.GetAllProducts(userID)
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if err != nil {
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products = []models.Product{}
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}
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buyers, err := h.db.GetAllBuyerDetails(userID)
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if err != nil {
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buyers = []models.BuyerDetails{}
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}
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return view.Render(c, view.BillingPage(products, buyers))
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}
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// CalculateBillHandler calculates the bill (HTMX endpoint)
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func (h *BillingHandlers) CalculateBillHandler(c echo.Context) error {
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userID := getUserID(c)
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customerType := c.FormValue("customer_type")
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regionType := c.FormValue("region_type")
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includeConvenienceFee := c.FormValue("include_convenience_fee") == "yes"
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cType := logic.CustomerRetail
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if customerType == "wholesale" {
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cType = logic.CustomerWholesale
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}
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isInterState := regionType == "inter"
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calculator := logic.NewCalculator()
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var items []logic.LineItem
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var totalFee float64
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// Support up to 50 product slots for dynamic adding
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for i := 0; i < 50; i++ {
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sku := c.FormValue("product_sku_" + strconv.Itoa(i))
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qtyStr := c.FormValue("qty_" + strconv.Itoa(i))
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if sku == "" {
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continue
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}
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qty, err := strconv.Atoi(qtyStr)
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if err != nil || qty <= 0 {
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continue
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}
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// Get product from DB (user-scoped)
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dbProduct, err := h.db.GetProductBySKU(sku, userID)
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if err != nil || dbProduct == nil {
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continue
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}
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// Convert to logic.Product
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product := logic.Product{
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SKU: dbProduct.SKU,
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Name: dbProduct.Name,
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HSNCode: dbProduct.HSNCode,
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BasePrice: dbProduct.BasePrice,
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WholesalePrice: dbProduct.WholesalePrice,
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GSTRate: logic.Rate(dbProduct.GSTRate),
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SmallOrderQty: dbProduct.SmallOrderQty,
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SmallOrderFee: dbProduct.SmallOrderFee,
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Unit: dbProduct.Unit,
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}
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lineItem := calculator.CalculateLineItem(product, qty, cType, isInterState)
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items = append(items, lineItem)
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// Apply per-product convenience fee if quantity is below threshold and checkbox is checked
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if includeConvenienceFee && product.SmallOrderQty > 0 && qty < product.SmallOrderQty && product.SmallOrderFee > 0 {
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totalFee += product.SmallOrderFee
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}
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}
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invoice := calculator.CalculateInvoice(items, totalFee, isInterState)
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invoice.CustomerType = cType
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return view.Render(c, view.InvoiceSummary(invoice))
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}
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// GenerateBillHandler generates final invoice with UUID and persists to DB
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func (h *BillingHandlers) GenerateBillHandler(c echo.Context) error {
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userID := getUserID(c)
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if userID == "" {
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return c.Redirect(http.StatusFound, "/")
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}
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customerType := c.FormValue("customer_type")
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regionType := c.FormValue("region_type")
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buyerID := c.FormValue("buyer_id")
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includeConvenienceFee := c.FormValue("include_convenience_fee") == "yes"
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cType := logic.CustomerRetail
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if customerType == "wholesale" {
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cType = logic.CustomerWholesale
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}
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isInterState := regionType == "inter"
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calculator := logic.NewCalculator()
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var items []logic.LineItem
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var totalFee float64
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for i := 0; i < 50; i++ {
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sku := c.FormValue("product_sku_" + strconv.Itoa(i))
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qtyStr := c.FormValue("qty_" + strconv.Itoa(i))
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if sku == "" {
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continue
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}
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qty, err := strconv.Atoi(qtyStr)
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if err != nil || qty <= 0 {
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continue
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}
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dbProduct, err := h.db.GetProductBySKU(sku, userID)
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if err != nil || dbProduct == nil {
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continue
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}
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product := logic.Product{
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SKU: dbProduct.SKU,
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Name: dbProduct.Name,
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HSNCode: dbProduct.HSNCode,
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BasePrice: dbProduct.BasePrice,
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WholesalePrice: dbProduct.WholesalePrice,
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GSTRate: logic.Rate(dbProduct.GSTRate),
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SmallOrderQty: dbProduct.SmallOrderQty,
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SmallOrderFee: dbProduct.SmallOrderFee,
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Unit: dbProduct.Unit,
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}
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lineItem := calculator.CalculateLineItem(product, qty, cType, isInterState)
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items = append(items, lineItem)
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// Apply per-product convenience fee if checkbox is checked
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if includeConvenienceFee && product.SmallOrderQty > 0 && qty < product.SmallOrderQty && product.SmallOrderFee > 0 {
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totalFee += product.SmallOrderFee
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}
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}
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if len(items) == 0 {
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return c.String(http.StatusBadRequest, "No products selected")
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}
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invoice := calculator.CalculateInvoice(items, totalFee, isInterState)
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invoice.CustomerType = cType
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// Get user's company and bank details
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user, err := h.db.GetUserByID(userID)
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if err == nil && user != nil {
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invoice.CompanyDetails = user.CompanyDetails
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invoice.BankDetails = user.BankDetails
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}
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// Get buyer details if selected
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if buyerID != "" {
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buyer, err := h.db.GetBuyerDetails(buyerID, userID)
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if err == nil && buyer != nil {
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invoice.BuyerName = buyer.Name
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invoice.BuyerDetails = buyer.Details
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}
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}
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// Generate UUID for invoice
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invoiceID := uuid.New().String()
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// Generate human-readable invoice ID
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humanReadableID, err := h.db.GetNextInvoiceNumber(userID)
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if err != nil {
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return c.String(http.StatusInternalServerError, "failed to generate invoice number")
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}
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// Persist to DB (user-scoped)
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if err := h.db.CreateInvoice(invoiceID, humanReadableID, invoice, userID); err != nil {
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return c.String(http.StatusInternalServerError, "failed to save invoice")
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}
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// Redirect to invoice view
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c.Response().Header().Set("HX-Redirect", fmt.Sprintf("/invoice/%s", invoiceID))
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return c.NoContent(http.StatusOK)
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}
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// ShowInvoiceHandler displays the invoice by UUID (requires auth)
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func (h *BillingHandlers) ShowInvoiceHandler(c echo.Context) error {
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userID := getUserID(c)
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if userID == "" {
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return c.Redirect(http.StatusFound, "/")
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}
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invoiceID := c.Param("id")
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inv, err := h.db.GetInvoice(invoiceID, userID)
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if err != nil || inv == nil {
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return view.RenderNotFound(c, "Invoice not found or you don't have access to it.")
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}
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// Parse the JSON data back into Invoice struct
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var invoice logic.Invoice
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if err := json.Unmarshal([]byte(inv.Data), &invoice); err != nil {
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return c.String(http.StatusInternalServerError, "failed to parse invoice data")
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}
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// Generate QR code for invoice URL
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invoiceURL := fmt.Sprintf("%s://%s/invoice/%s", c.Scheme(), c.Request().Host, invoiceID)
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qrPNG, err := qrcode.Encode(invoiceURL, qrcode.Medium, 100)
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if err != nil {
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return c.String(http.StatusInternalServerError, "failed to generate QR code")
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}
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qrBase64 := base64.StdEncoding.EncodeToString(qrPNG)
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// Render printable invoice page with multi-page support
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c.Response().Header().Set(echo.HeaderContentType, echo.MIMETextHTML)
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w := c.Response().Writer
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fmt.Fprint(w, "<!doctype html><html><head><meta charset='utf-8'><meta name='viewport' content='width=device-width,initial-scale=1'><title>Invoice ")
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fmt.Fprintf(w, "%s</title>", invoiceID[:8])
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fmt.Fprint(w, "<link href='/assets/css/output.css' rel='stylesheet'>")
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fmt.Fprint(w, `<style type="text/css">
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@media print {
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.no-print { display: none !important; }
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.page-break { page-break-before: always; }
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@page { margin: 1cm; size: A4; }
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body { background: white !important; }
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.invoice-table th { background: #e0e0e0 !important; color: black !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
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.invoice-totals .row-total { background: #e0e0e0 !important; color: black !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
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}
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.invoice-details-block { white-space: pre-wrap; font-size: 0.875rem; line-height: 1.4; }
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.invoice-footer-section { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid #e0e0e0; }
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</style>`)
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fmt.Fprint(w, "</head><body>")
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fmt.Fprintf(w, `<div class="container page">
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<div class="no-print" style="display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid #e0e0e0;">
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<a href="/invoice" class="text-accent">← Back</a>
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<button onclick="window.print()" class="btn btn-primary">Print Invoice</button>
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</div>
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<div class="invoice">
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<div class="invoice-header">
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<div>
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<h1 class="invoice-title">Tax Invoice</h1>
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</div>
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<div class="invoice-meta">
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<p>Invoice ID: %s</p>
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</div>
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<div class="invoice-meta">
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<p>Date: %s</p>
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</div>
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</div>`, inv.HumanReadableID, strings.ReplaceAll(inv.CreatedAt, "T", " ")[0:10])
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// Display company details above the invoice table
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if invoice.CompanyDetails != "" {
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fmt.Fprintf(w, `<div class="invoice-details-block" style="margin-bottom:1rem;"><strong>From:</strong><br>%s</div>`, invoice.CompanyDetails)
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}
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if err := view.PrintableInvoice(invoice).Render(c.Request().Context(), w); err != nil {
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return err
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}
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// Display buyer details and total amount in same section (50-50 split or 100% if no buyer)
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totalGST := invoice.TotalCGST + invoice.TotalSGST + invoice.TotalIGST
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hasBuyerInfo := invoice.BuyerName != "" || invoice.BuyerDetails != ""
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if hasBuyerInfo {
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fmt.Fprint(w, `<div class="invoice-footer-section" style="display:flex;justify-content:space-between;gap:2rem;">`)
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// Left side: Billed To (50%)
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fmt.Fprint(w, `<div style="flex:1;"><strong>Billed To:</strong><br>`)
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if invoice.BuyerName != "" {
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fmt.Fprintf(w, `<span class="invoice-details-block">%s</span>`, invoice.BuyerName)
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}
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if invoice.BuyerDetails != "" {
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fmt.Fprintf(w, `<br><span class="invoice-details-block">%s</span>`, invoice.BuyerDetails)
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}
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fmt.Fprint(w, `</div>`)
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// Right side: Total Amount (50%)
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fmt.Fprintf(w, `<div style="flex:1;">
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<p style="margin: 0.5rem 0;"><strong>Total Amount (before GST):</strong><br>%s</p>
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<p style="margin: 0.5rem 0;"><strong>GST Amount:</strong><br>%s</p>
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</div>`, numberToWords(invoice.SubTotal), numberToWords(totalGST))
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} else {
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fmt.Fprint(w, `<div class="invoice-footer-section">`)
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// Total Amount takes 100%
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fmt.Fprintf(w, `<div>
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<p style="margin: 0.5rem 0;"><strong>Total Amount (before GST):</strong><br>%s</p>
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<p style="margin: 0.5rem 0;"><strong>GST Amount:</strong><br>%s</p>
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</div>`, numberToWords(invoice.SubTotal), numberToWords(totalGST))
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}
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fmt.Fprint(w, `</div>`)
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// Bank details (left) and QR code (right) in the same section
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fmt.Fprint(w, `<div class="invoice-footer-section" style="display:flex;justify-content:space-between;align-items:flex-start;">`)
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if invoice.BankDetails != "" {
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fmt.Fprintf(w, `<div style="flex:1;"><strong>Bank Details:</strong><br><span class="invoice-details-block">%s</span></div>`, invoice.BankDetails)
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} else {
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fmt.Fprint(w, `<div style="flex:1;"></div>`)
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}
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fmt.Fprintf(w, `<div style="margin-left:1rem;"><img src="data:image/png;base64,%s" alt="QR Code" style="width:80px;height:80px;"></div>`, qrBase64)
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fmt.Fprint(w, `</div>`)
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fmt.Fprint(w, "</div>")
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fmt.Fprint(w, "</div></body></html>")
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return nil
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}
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// AddProductRowHandler returns HTML for a new product row (HTMX endpoint)
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func (h *BillingHandlers) AddProductRowHandler(c echo.Context) error {
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userID := getUserID(c)
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indexStr := c.QueryParam("index")
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index, err := strconv.Atoi(indexStr)
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if err != nil {
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index = 0
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}
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products, _ := h.db.GetAllProducts(userID)
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// Build product options HTML
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productOptions := `<option value="">-- Select Product --</option>`
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for _, p := range products {
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productOptions += fmt.Sprintf(`<option value="%s">%s (₹%.2f)</option>`, p.SKU, p.Name, p.BasePrice)
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}
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rowHTML := fmt.Sprintf(`
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<div class="product-row">
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<div class="product-row-grid">
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<div class="form-group" style="margin:0;">
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<label class="form-label">Product</label>
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<select name="product_sku_%d" class="form-select">%s</select>
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</div>
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<div class="form-group" style="margin:0;">
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<label class="form-label">Qty</label>
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<input type="number" name="qty_%d" value="1" min="0" class="form-input">
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</div>
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<div style="padding-top:20px;">
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<button type="button" onclick="this.closest('.product-row').remove()" class="btn btn-danger btn-sm">×</button>
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</div>
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</div>
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</div>`, index, productOptions, index)
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return c.HTML(http.StatusOK, rowHTML)
|
||||
}
|
||||
Reference in New Issue
Block a user