From 77c678dd7a16c06566338b7ba5832a7974847d70 Mon Sep 17 00:00:00 2001
From: nquidox <nquidox@gmail.com>
Date: Fri, 26 Sep 2025 20:16:21 +0300
Subject: [PATCH] get prices for single entity

---
 internal/api/merch/controller.go | 39 +++++++++++++++++++++-
 internal/api/merch/repository.go | 25 +++++++++++++++
 internal/api/merch/service.go    | 55 ++++++++++++++++++++++++--------
 3 files changed, 105 insertions(+), 14 deletions(-)

diff --git a/internal/api/merch/controller.go b/internal/api/merch/controller.go
index fa8ecdd..2e31a66 100644
--- a/internal/api/merch/controller.go
+++ b/internal/api/merch/controller.go
@@ -32,6 +32,7 @@ func (h *Handler) RegisterRoutes(r *gin.RouterGroup, authMW gin.HandlerFunc, ref
 
 	chartsGroup := r.Group("/prices", authMW)
 	chartsGroup.GET("", h.controller.getChartsPrices)
+	chartsGroup.GET("/:uuid", h.controller.getDistinctPrices)
 
 }
 
@@ -196,7 +197,7 @@ func (co *controller) deleteMerch(c *gin.Context) {
 // @Description	Получить цены мерча за период
 // @Tags			Merch
 // @Security		BearerAuth
-// @Param			days	query		string	false	"merch_uuid"
+// @Param			days	query		string	false	"period in days"
 // @Success		200		{array}		PricesResponse
 // @Failure		400		{object}	responses.ErrorResponse400
 // @Failure		500		{object}	responses.ErrorResponse500
@@ -220,3 +221,39 @@ func (co *controller) getChartsPrices(c *gin.Context) {
 
 	c.JSON(http.StatusOK, response)
 }
+
+// @Summary		Получить перепады цен мерча за период по его merch_uuid
+// @Description	Получить перепады цен мерча за период по его merch_uuid
+// @Tags			Merch
+// @Security		BearerAuth
+// @Param			uuid			path		string	true	"merch_uuid"
+// @Param			days	query		string	false	"period in days"
+// @Success		200		{object}		PricesResponse
+// @Failure		400		{object}	responses.ErrorResponse400
+// @Failure		500		{object}	responses.ErrorResponse500
+// @Router			/prices/{uuid}	[get]
+func (co *controller) getDistinctPrices(c *gin.Context) {
+	daysQuery := strings.ToLower(c.DefaultQuery("days", ""))
+
+	userUuid, err := co.utils.GetUserUuidFromContext(c)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, responses.ErrorResponse500{Error: err.Error()})
+		log.WithError(err).Error("Merch | Failed to get user uuid from context")
+		return
+	}
+
+	merchUuid := c.Param("uuid")
+	if merchUuid == "" {
+		c.JSON(http.StatusBadRequest, responses.ErrorResponse400{Error: "MerchUuid is empty"})
+		return
+	}
+
+	response, err := co.service.getDistinctPrices(userUuid, merchUuid, daysQuery)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, responses.ErrorResponse500{Error: err.Error()})
+		log.WithError(err).Error("Merch | Failed to get single merch")
+		return
+	}
+
+	c.JSON(http.StatusOK, response)
+}
diff --git a/internal/api/merch/repository.go b/internal/api/merch/repository.go
index e1aebef..e7a17e9 100644
--- a/internal/api/merch/repository.go
+++ b/internal/api/merch/repository.go
@@ -34,6 +34,7 @@ type repository interface {
 
 type prices interface {
 	getPricesWithDays(userUuid string, period time.Time) ([]Price, error)
+	getDistinctPrices(userUuid, merchUuid string, period time.Time) (prices []Price, err error)
 }
 
 func (r *Repo) addMerch(bundle merchBundle) error {
@@ -198,3 +199,27 @@ func (r *Repo) getPricesWithDays(userUuid string, period time.Time) (prices []Pr
 	}
 	return prices, nil
 }
+
+func (r *Repo) getDistinctPrices(userUuid, merchUuid string, period time.Time) (prices []Price, err error) {
+	err = r.db.Raw(`
+		SELECT price, created_at, origin
+		FROM (
+		    SELECT DISTINCT ON (price) price, created_at, origin
+		    FROM prices
+		    WHERE merch_uuid = ?
+		      AND created_at > ?
+		      AND deleted_at IS NULL
+		      AND EXISTS (
+		          SELECT 1
+		          FROM merch
+		          WHERE merch_uuid = ?
+		            AND user_uuid = ?
+		      ) 
+		) AS up
+		ORDER BY created_at;`, merchUuid, period, merchUuid, userUuid).Scan(&prices).Error
+
+	if err != nil {
+		return nil, err
+	}
+	return prices, nil
+}
diff --git a/internal/api/merch/service.go b/internal/api/merch/service.go
index ae9384c..0e17c8d 100644
--- a/internal/api/merch/service.go
+++ b/internal/api/merch/service.go
@@ -4,7 +4,6 @@ import (
 	"database/sql"
 	"errors"
 	"github.com/google/uuid"
-	"strconv"
 	"time"
 )
 
@@ -98,18 +97,7 @@ func (s *service) getPrices(userUuid string, days string) ([]PricesResponse, err
 		})
 	}
 
-	daysInt, err := strconv.Atoi(days)
-	if err != nil {
-		daysInt = 7
-	}
-
-	if daysInt > 365 {
-		daysInt = 7
-	}
-
-	period := time.Now().UTC().Add(-(time.Duration(daysInt) * time.Hour * 24))
-
-	pricesList, err := s.repo.getPricesWithDays(userUuid, period)
+	pricesList, err := s.repo.getPricesWithDays(userUuid, getPeriod(days))
 	if err != nil {
 		return nil, err
 	}
@@ -142,3 +130,44 @@ func (s *service) getPrices(userUuid string, days string) ([]PricesResponse, err
 
 	return response, nil
 }
+
+func (s *service) getDistinctPrices(userUuid, merchUuid, days string) (PricesResponse, error) {
+	result, err := s.repo.getDistinctPrices(userUuid, merchUuid, getPeriod(days))
+	if err != nil {
+		return PricesResponse{}, err
+	}
+
+	if result == nil {
+		return PricesResponse{}, errors.New("no prices found")
+	}
+
+	originSurugaya := OriginWithPrices{
+		Origin: surugaya,
+		Prices: []PriceEntry{},
+	}
+
+	originMandarake := OriginWithPrices{
+		Origin: mandarake,
+		Prices: []PriceEntry{},
+	}
+
+	for _, item := range result {
+		switch item.Origin {
+		case surugaya:
+			originSurugaya.Prices = append(originSurugaya.Prices, PriceEntry{
+				CreatedAt: item.CreatedAt.Unix(),
+				Value:     item.Price,
+			})
+		case mandarake:
+			originMandarake.Prices = append(originMandarake.Prices, PriceEntry{
+				CreatedAt: item.CreatedAt.Unix(),
+				Value:     item.Price,
+			})
+		}
+	}
+
+	return PricesResponse{
+		MerchUuid: merchUuid,
+		Origins:   []OriginWithPrices{originSurugaya, originMandarake},
+	}, nil
+}