Added invoices endpoint

database/invoice/invoice.go

@@ -0,0 +1,61 @@
+package invoice
+
+import (
+	"fmt"
+	"strings"
+
+	"gitlab.com/pactual1/backend/models"
+	"gitlab.com/pactual1/backend/shared"
+)
+
+func GetInvoices(buyerName string, sortBy string, limit int, offset int, id uint) ([]models.Invoice, int64, error) {
+    var invoices []models.Invoice
+
+    // Default sort by InvoiceDate DESC
+    sortField := "invoice_date"
+    sortOrder := "desc"
+
+    if sortBy == "InvoiceDate" || sortBy == "InvoiceDueDate" {
+        sortField = strings.ToLower(sortBy)
+    }
+
+    dbOrder := fmt.Sprintf("%s %s", sortField, sortOrder)
+
+    db := shared.GetDb()
+    countDb := db
+
+    if buyerName != "" {
+        db = db.Where("buyer_name LIKE ?", "%"+buyerName+"%")
+        countDb = countDb.Where("buyer_name LIKE ?", "%"+buyerName+"%")
+    }
+
+    // Added conditional for ID search
+    if id != 0 {
+        db = db.Where("id = ?", id)
+        countDb = countDb.Where("id = ?", id)
+    }
+
+    var total int64
+    if err := countDb.Model(&models.Invoice{}).Count(&total).Error; err != nil {
+        return nil, 0, err
+    }
+
+    if err := db.Preload("InvoiceItem").
+        Order(dbOrder).
+        Limit(limit).
+        Offset(offset).
+        Find(&invoices).Error; err != nil {
+        return nil, 0, err
+    }
+
+    for i := range invoices {
+        var sum int64
+        for _, item := range invoices[i].InvoiceItem {
+            sum += item.PriceCents * item.Quantity
+        }
+        invoices[i].PriceCents = sum
+    }
+
+    return invoices, total, nil
+}
+