Add payment/all route and handler

sq

cmd/http-server/main.go

@@ -127,6 +127,7 @@ func main() {
 		paymentRoutes := api.Group("/payment", middleware.AuthMiddleware())
 		{
 			paymentRoutes.POST("/add", handlers.PaymentAdd)
+			paymentRoutes.GET("/all", handlers.PaymentGetAll)
 		}
 		currencyRoutes := api.Group("/currency", middleware.AuthMiddleware())
 		{

db/expense.go

@@ -34,6 +34,7 @@ type Helper_ExpenseBulk struct {
 	UserID           uint
 }
 
+// {{{ Helper_ExpenseBulk.CreateExpenseFromChild I'm not proud of this code
 func (he *Helper_ExpenseBulk) CreateExpenseFromChild(c Expense) *Expense {
 	var cardID uint
 	var typeID uint
@@ -80,6 +81,8 @@ func (he *Helper_ExpenseBulk) CreateExpenseFromChild(c Expense) *Expense {
 	}
 }
 
+// }}}
+
 // Implements db.UserIdentifiable:1
 func (e Expense) GetID() uint {
 	return e.ID
@@ -96,7 +99,7 @@ func (e *Expense) SetUserID(id uint) {
 }
 
 var (
-	ERROR_EXPENSE_INVALID_USERID            = errors.New("Expense's `UserID` and Card's `UserID` are not equal")
+	ERROR_EXPENSE_INVALID_CARD_USERID       = errors.New("Expense's `UserID` and Card's `UserID` are not equal")
 	ERROR_EXPENSE_CARD_INSUFFICIENT_BALANCE = errors.New("Card's `Balance` is lower than Expense's Value")
 	ERROR_EXPENSE_INVALID_TYPE_USERID       = errors.New("Expense's `UserID` and Type's `UserID` are not equal")
 )
@@ -107,7 +110,7 @@ func (e *Expense) BeforeCreate(tx *gorm.DB) error {
 		return err
 	}
 	if card.UserID != e.UserID {
-		return ERROR_EXPENSE_INVALID_USERID
+		return ERROR_EXPENSE_INVALID_CARD_USERID
 	}
 	if card.Balance < e.Value {
 		return ERROR_EXPENSE_CARD_INSUFFICIENT_BALANCE
@@ -138,7 +141,7 @@ func (e *Expense) BeforeUpdate(tx *gorm.DB) (err error) {
 			return err
 		}
 		if oldCard.UserID != e.UserID {
-			return ERROR_EXPENSE_INVALID_USERID
+			return ERROR_EXPENSE_INVALID_CARD_USERID
 		}
 		oldCard.Balance += original.Value
 		if err := tx.Save(oldCard).Error; err != nil {
@@ -152,7 +155,7 @@ func (e *Expense) BeforeUpdate(tx *gorm.DB) (err error) {
 			return err
 		}
 		if newCard.UserID != e.UserID {
-			return ERROR_EXPENSE_INVALID_USERID
+			return ERROR_EXPENSE_INVALID_CARD_USERID
 		}
 		if newCard.Balance < e.Value {
 			return ERROR_EXPENSE_CARD_INSUFFICIENT_BALANCE
@@ -178,7 +181,7 @@ func (e *Expense) AfterDelete(tx *gorm.DB) (err error) {
 		return err
 	}
 	if card.UserID != e.UserID {
-		return ERROR_EXPENSE_INVALID_USERID
+		return ERROR_EXPENSE_INVALID_CARD_USERID
 	}
 	card.Balance += e.Value
 	if err := tx.Save(card).Error; err != nil {

db/payment.go

@@ -1,6 +1,7 @@
 package db
 
 import (
+	"errors"
 	"time"
 
 	"gorm.io/gorm"
@@ -23,3 +24,26 @@ type Payment struct {
 }
 
 func (p Payment) __internalBelogingToPayment() {}
+
+var (
+	ERROR_PAYMENT_INVALID_CARD_USERID     = errors.New("Payment's `UserID` and Card's `UserID` are not equal")
+	ERROR_PAYMENT_INVALID_CATEGORY_USERID = errors.New("Payment's `UserID` and Category's `UserID` are not equal")
+)
+
+func (p *Payment) BeforeSave(tx *gorm.DB) error {
+	paymentCard := &Card{}
+	if err := tx.Find(paymentCard, p.CardID).Error; err != nil {
+		return err
+	}
+	if paymentCard.UserID != p.UserID {
+		return ERROR_PAYMENT_INVALID_CARD_USERID
+	}
+	paymentCategory := &Category{}
+	if err := tx.Find(paymentCategory, p.CategoryID).Error; err != nil {
+		return err
+	}
+	if paymentCategory.UserID != p.UserID {
+		return ERROR_PAYMENT_INVALID_CATEGORY_USERID
+	}
+	return nil
+}

handlers/payment.go

@@ -9,16 +9,33 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-var itemBoughtTransform func(inp *db.ItemBought) types.ItemBought = func(inp *db.ItemBought) types.ItemBought {
-	return types.ItemBought{}
+var itemBoughtTransform func(inp *db.ItemBought) types.DbItemBought = func(inp *db.ItemBought) types.DbItemBought {
+	var item types.DbItem
+	var price uint64 = 0
+	if inp.Item != nil {
+		item = itemTransform(inp.Item)
+		price = inp.Item.Price
+	}
+	return types.DbItemBought{
+		ID:          inp.ID,
+		ItemID:      inp.ItemID,
+		PaymentID:   inp.PaymentID,
+		TypeID:      inp.TypeID,
+		Price:       price,
+		Quantity:    inp.Quantity,
+		TotalCost:   inp.TotalCost,
+		MetricType:  inp.MetricType,
+		MetricValue: inp.MetricValue,
+		Item:        item,
+	}
 }
 
-var paymentTransform func(inp *db.Payment) types.Payment = func(inp *db.Payment) types.Payment {
-	var items []types.ItemBought
+var paymentTransform func(inp *db.Payment) types.DbPayment = func(inp *db.Payment) types.DbPayment {
+	var items []types.DbItemBought
 	for _, item := range inp.Items {
 		items = append(items, itemBoughtTransform(&item))
 	}
-	return types.Payment{
+	return types.DbPayment{
 		ID:          inp.ID,
 		CardID:      inp.CardID,
 		CategoryID:  inp.CategoryID,
@@ -36,7 +53,7 @@ var paymentTransform func(inp *db.Payment) types.Payment = func(inp *db.Payment)
 // @Accept json
 // @Produce json
 // @Param Authorization header string true "Bearer token"
-// @Param payment body types.Payment true "Payment"
+// @Param payment body types.DbPayment true "Payment"
 // @Success 200 {object} types.Message
 // @Failure 400 {object} types.ErrorResponse
 // @Failure 500 {object} types.ErrorResponse
@@ -49,7 +66,7 @@ func PaymentAdd(c *gin.Context) {
 		return
 	}
 
-	var updates types.Payment
+	var updates types.DbPayment
 	if err := c.ShouldBindJSON(&updates); err != nil {
 		log.Printf("err is %v\n", err)
 		c.JSON(400, types.ErrorResponse{Message: "Invalid request"})
@@ -63,7 +80,7 @@ func PaymentAdd(c *gin.Context) {
 		if weNeedRollback {
 			dbc := db.Connect()
 			for _, deleteIt := range deletableIfRollback {
-				if err := dbc.Debug().Delete(deleteIt).Error; err != nil {
+				if err := dbc.Delete(deleteIt).Error; err != nil {
 					log.Printf("ERROR: dbc.Delete: %v\n", err)
 					continue
 				}
@@ -92,7 +109,9 @@ func PaymentAdd(c *gin.Context) {
 		return
 	}
 	deletableIfRollback = append(deletableIfRollback, payment)
+	var substractFromCard uint64 = 0
 	for _, uItemBought := range updates.Items {
+		var totalCost uint64 = 0
 		// Creating item and adding it to rollback if itemID is set to 0
 		if uItemBought.ItemID == 0 {
 			newItem := &db.Item{
@@ -116,12 +135,13 @@ func PaymentAdd(c *gin.Context) {
 				return
 			}
 			deletableIfRollback = append(deletableIfRollback, newItem)
+			totalCost = newItem.Price * uint64(uItemBought.Quantity)
 			newItemBought := &db.ItemBought{
 				ItemID:      newItem.ID,
 				PaymentID:   payment.ID,
 				TypeID:      uItemBought.TypeID,
 				Quantity:    uItemBought.Quantity,
-				TotalCost:   newItem.Price * uint64(uItemBought.Quantity),
+				TotalCost:   totalCost,
 				MetricType:  uItemBought.MetricType,
 				MetricValue: uItemBought.MetricValue,
 			}
@@ -138,9 +158,104 @@ func PaymentAdd(c *gin.Context) {
 			deletableIfRollback = append(deletableIfRollback, newItemBought)
 			newItemBought.Item = newItem
 		} else {
-			// TODO: check if Item has same userID and potentially update Item
+			dbItem := &db.Item{}
+			if err := dbc.Find(dbItem, uItemBought.ItemID).Error; err != nil {
+				c.JSON(500, types.ErrorResponse{Message: err.Error()})
+				weNeedRollback = true
+				return
 			}
+			if dbItem.UserID != userID {
+				c.JSON(500, types.ErrorResponse{Message: "ItemID is not your"})
+				weNeedRollback = true
+				return
+			}
+			if dbItem.Price != uItemBought.Price {
+				dbItem.Price = uItemBought.Price
+				if err := dbc.Save(dbItem).Error; err != nil {
+					c.JSON(500, types.ErrorResponse{Message: err.Error()})
+					weNeedRollback = true
+					return
+				}
+			}
+			totalCost = dbItem.Price * uint64(uItemBought.Quantity)
+			newItemBought := &db.ItemBought{
+				ItemID:      dbItem.ID,
+				PaymentID:   payment.ID,
+				TypeID:      uItemBought.TypeID,
+				Quantity:    uItemBought.Quantity,
+				TotalCost:   totalCost,
+				MetricType:  uItemBought.MetricType,
+				MetricValue: uItemBought.MetricValue,
+			}
+			if err := dbc.Create(newItemBought).Error; err != nil {
+				c.JSON(500, types.ErrorResponse{Message: err.Error()})
+				weNeedRollback = true
+				return
+			}
+			if newItemBought.ID == 0 {
+				c.JSON(500, types.ErrorResponse{Message: "Internal error: ERR.P.A.4"})
+				weNeedRollback = true
+				return
+			}
+			deletableIfRollback = append(deletableIfRollback, newItemBought)
+			newItemBought.Item = dbItem
+		}
+		// As totalCost is calculated either way AND db.Item.BeforeSave have db.Item.Price check
+		//  we can gently assume that totalCost != 0
+		substractFromCard += totalCost
+	}
+
+	// Checks for db.Card.UserID != db.Payment.UserID for payment is done in db.Payment hooks
+	card := &db.Card{}
+	if err := dbc.Find(card, payment.CardID).Error; err != nil {
+		c.JSON(500, types.ErrorResponse{Message: err.Error()})
+		weNeedRollback = true
+		return
+	}
+	// TODO: Examine if that would be better to calculate substractFromCard
+	//  BEFORE update.Items loop and therefore this check can be done before
+	//  processing payment's ItemBought entities
+	if card.Balance < substractFromCard {
+		c.JSON(500, types.ErrorResponse{Message: fmt.Sprintf("Card %s (%s) has Balance lower than overall Payment cost. Rollback.", card.Name, card.LastDigits)})
+		weNeedRollback = true
+		return
+	}
+	card.Balance -= substractFromCard
+	if err := dbc.Save(card).Error; err != nil {
+		c.JSON(500, types.ErrorResponse{Message: err.Error()})
+		weNeedRollback = true
+		return
 	}
 
 	c.JSON(200, types.Message{Info: fmt.Sprintf("Entity with %d ID is created successfully!", payment.ID)})
 }
+
+// @Summary Get all payments for user
+// @Description Get all payments for user
+// @Tags type
+// @Produce json
+// @Param Authorization header string true "Bearer token"
+// @Success 200 {object} []types.DbPayment
+// @Failure 401 {object} types.ErrorResponse
+// @Failure 500 {object} types.ErrorResponse
+// @Security ApiKeyAuth
+// @Router /payment/all [get]
+func PaymentGetAll(c *gin.Context) {
+	userID, err := GetUserID(c)
+	if err != nil {
+		c.JSON(500, types.ErrorResponse{Message: err.Error()})
+		return
+	}
+	dbc := db.Connect()
+	var entities []*db.Payment
+	if err := dbc.Preload("Items.Item").Find(&entities, db.Payment{UserID: userID}).Error; err != nil {
+		c.JSON(500, types.ErrorResponse{Message: err.Error()})
+		return
+	}
+
+	var ret []types.DbPayment
+	for _, entity := range entities {
+		ret = append(ret, paymentTransform(entity))
+	}
+	c.JSON(200, ret)
+}

types/types.go

@@ -155,7 +155,7 @@ type DbCurrency struct {
 	Symbol  string `json:"symbol" example:"$"`
 }
 
-type Payment struct {
+type DbPayment struct {
 	ID          uint           `json:"id" example:"1"`
 	CardID      uint           `json:"card_id" example:"1"`
 	CategoryID  uint           `json:"category_id" example:"1"`
@@ -163,10 +163,10 @@ type Payment struct {
 	Description string         `json:"descr" example:"i bought some title for 20$"`
 	Note        string         `json:"note" example:"no i did not hit domain"`
 	Date        time.Time      `json:"date" example:"29/11/2001 12:00"`
-	Items       []ItemBought `json:"items" example:"[]"`
+	Items       []DbItemBought `json:"items" example:"[]"`
 }
 
-type ItemBought struct {
+type DbItemBought struct {
 	ID          uint   `json:"id" example:"1"`
 	NewName     string `json:"new_name" example:"itemName"`
 	NewComment  string `json:"new_comment" example:"itemName"`
@@ -178,4 +178,5 @@ type ItemBought struct {
 	TotalCost   uint64 `json:"total_cost" example:"2050"`
 	MetricType  uint8  `json:"metric_type" example:"0"`
 	MetricValue uint64 `json:"metric_value" example:"100"`
+	Item        DbItem `json:"itme"`
 }