From bb088225a27d04c8237bfcdc7658a5564e838082 Mon Sep 17 00:00:00 2001
From: Vidhu Kant Sharma <vidhukant@vidhukant.com>
Date: Mon, 4 Dec 2023 14:55:24 +0530
Subject: added endpoint to get an invoice's items only

---
 invoice/controller.go | 40 ++++++++++++++++++++++++++++++++++++++++
 invoice/router.go     |  1 +
 invoice/service.go    | 15 +++++++++++++++
 3 files changed, 56 insertions(+)

(limited to 'invoice')

diff --git a/invoice/controller.go b/invoice/controller.go
index 6bd5ad5..d3dd51c 100644
--- a/invoice/controller.go
+++ b/invoice/controller.go
@@ -192,6 +192,46 @@ func handleDelInvoice (ctx *gin.Context) {
 	})
 }
 
+// get items belonging to a certain invoice
+func handleGetInvoiceItems (ctx *gin.Context) {
+	id, err := strconv.ParseUint(ctx.Param("id"), 10, 64)
+	if err != nil {
+		ctx.Error(e.ErrInvalidID)
+		ctx.Abort()
+		return
+	}
+
+	uId, ok := ctx.Get("UserID")
+	if !ok {
+		ctx.Error(e.ErrUnauthorized)
+		ctx.Abort()
+		return
+	}
+
+	userId := uId.(uint)
+
+
+	err = checkInvoiceOwnership(uint(id), userId)
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	var items []InvoiceItem
+	err = getInvoiceItems(&items, uint(id))
+	if err != nil {
+		ctx.Error(err)
+		ctx.Abort()
+		return
+	}
+
+	ctx.JSON(http.StatusOK, gin.H{
+		"message": "success",
+		"data": items,
+	})
+}
+
 func addItem (ctx *gin.Context) {
 	id, err := strconv.ParseUint(ctx.Param("id"), 10, 64)
 	if err != nil {
diff --git a/invoice/router.go b/invoice/router.go
index 7631cb9..290eacb 100644
--- a/invoice/router.go
+++ b/invoice/router.go
@@ -29,6 +29,7 @@ func Routes(route *gin.RouterGroup) {
 		g.GET("/:id", handleGetSingleInvoice)
 		g.POST("/", handleSaveInvoice)
 		g.DELETE("/:id", handleDelInvoice)
+		g.GET("/:id/item", handleGetInvoiceItems)
 		g.POST("/:id/item", addItem)
 		g.DELETE("/item/:id", removeItem)
 	}
diff --git a/invoice/service.go b/invoice/service.go
index 91e2707..91579c6 100644
--- a/invoice/service.go
+++ b/invoice/service.go
@@ -81,6 +81,21 @@ func getInvoices(invoices *[]Invoice, userId uint, isDraft bool) error {
 	return nil
 }
 
+func getInvoiceItems(items *[]InvoiceItem, invoiceId uint) error {
+	res := db.Where("invoice_id = ?", invoiceId).Find(&items)
+
+	// TODO: handle potential errors
+	if res.Error != nil {
+		return res.Error
+	}
+
+	if res.RowsAffected == 0 {
+		return e.ErrEmptyResponse
+	}
+
+	return nil
+}
+
 // TODO: route to only get the invouce's items
 
 func (i *Invoice) upsert() error {
-- 
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