feat: add future date check to purchase survey

* closes #13

internal/router/transaction.go

@@ -3,6 +3,7 @@ package router
 import (
 	"fmt"
 	"log"
+	"time"
 
 	"github.com/labstack/echo/v5"
 	"github.com/pocketbase/pocketbase/apis"
@@ -11,6 +12,8 @@ import (
 	"github.com/pocketbase/pocketbase/models"
 )
 
+const timezone = "Europe/Moscow"
+
 func (r *RouterContainer) bootstrapTransactionRoute() {
 	r.PB.OnBeforeServe().Add(func(e *core.ServeEvent) error {
 		e.Router.POST("/transaction", func(c echo.Context) error {
@@ -69,6 +72,14 @@ func (r *RouterContainer) bootstrapTransactionRoute() {
 					return apis.NewNotFoundError(fmt.Sprintf("Counterparty is not registered to %s", requestData.DistributorName), err)
 				}
 
+				incorrectDate, err := isFutureDate(requestData.TxBuyDate)
+				if err != nil {
+					return apis.NewBadRequestError("Incorrect date format", err)
+				}
+				if incorrectDate {
+					return apis.NewBadRequestError("Date cannot be in the future", err)
+				}
+
 				txData["evergrow_quantity"] = requestData.EvergrowQuantityPurchase
 				txData["distributor_name"] = requestData.DistributorName
 				txData["counterparty"] = counterpartyRecord.Id
@@ -85,6 +96,14 @@ func (r *RouterContainer) bootstrapTransactionRoute() {
 					return apis.NewNotFoundError("Counterparty is not registered as a farmer", err)
 				}
 
+				incorrectDate, err := isFutureDate(requestData.TxSellDate)
+				if err != nil {
+					return apis.NewBadRequestError("Incorrect date format", err)
+				}
+				if incorrectDate {
+					return apis.NewBadRequestError("Date cannot be in the future", err)
+				}
+
 				txData["evergrow_quantity"] = requestData.EvergrowQuantitySale
 				txData["counterparty"] = counterpartyRecord.Id
 				txData["tx_date"] = requestData.TxSellDate
@@ -106,3 +125,22 @@ func (r *RouterContainer) bootstrapTransactionRoute() {
 		return nil
 	})
 }
+
+func isFutureDate(inputDate string) (bool, error) {
+	parsedDate, err := time.Parse("2006-01-02", inputDate)
+	if err != nil {
+		return false, err
+	}
+
+	location, err := time.LoadLocation(timezone)
+	if err != nil {
+		return false, err
+	}
+
+	parsedDate = parsedDate.In(location)
+
+	currentDate := time.Now().In(location)
+	fmt.Println(currentDate)
+
+	return parsedDate.After(currentDate), nil
+}