merch-api/internal/merch/service_prices.go

package merch

import (
	"context"
	"errors"
	"fmt"
)

func (s *service) getPrices(ctx context.Context, userId int64, days int) ([]PricesResponse, error) {
	fmt.Println("Enter service")
	merchList, err := s.repo.getAllUserMerch(ctx, userId)
	if err != nil {
		logErr(serviceLogHeader, err)
		return nil, err
	}

	if len(merchList) == 0 {
		errMsg := errors.New("no merch found")
		logErr(serviceLogHeader, errMsg)
		return nil, errMsg
	}

	merchMap := make(map[int64]Merch, len(merchList))
	for _, merch := range merchList {
		merchMap[merch.Id] = merch
	}

	var response []PricesResponse
	for _, item := range merchList {
		response = append(response, PricesResponse{
			MerchUuid: item.MerchUuid,
			Name:      item.Name,
			Origins:   []OriginWithPrices{},
		})
	}

	pricesList, err := s.repo.getPricesWithDays(ctx, userId, getPeriod(days))
	if err != nil {
		logErr(serviceLogHeader, err)
		return nil, err
	}

	_, originNamesMap, err := s.getOriginsMaps(ctx)
	if err != nil {
		logErr(serviceLogHeader, err)
		return nil, err
	}

	pricesMap := make(map[string]map[string][]PriceEntry)
	for _, item := range pricesList {
		merchUuid := merchMap[item.MerchId].MerchUuid

		if _, ok := pricesMap[merchUuid]; !ok {
			pricesMap[merchUuid] = make(map[string][]PriceEntry)
		}

		originName := originNamesMap[item.OriginId]
		pricesMap[merchUuid][originName] = append(pricesMap[merchUuid][originName], PriceEntry{
			CreatedAt: item.CreatedAt.Unix(),
			Value:     item.Price,
		})
	}

	for i := range response {
		for _, name := range originNamesMap {
			prices := pricesMap[response[i].MerchUuid][name]
			if prices == nil {
				continue
			}

			response[i].Origins = append(response[i].Origins, OriginWithPrices{
				Origin: name,
				Prices: prices,
			})
		}
	}

	return response, nil
}

func (s *service) getDistinctPrices(ctx context.Context, userId int64, merchUuid string, days int) (*PricesResponse, error) {
	result, err := s.repo.getDistinctPrices(ctx, userId, merchUuid, getPeriod(days))
	if err != nil {
		logErr(serviceLogHeader, err)
		return nil, err
	}

	if result == nil {

		return nil, nil
	}

	_, originNamesMap, err := s.getOriginsMaps(ctx)
	if err != nil {
		logErr(serviceLogHeader, err)
		return nil, err
	}

	response := PricesResponse{
		MerchUuid: merchUuid,
		Origins:   []OriginWithPrices{},
	}

	pricesMap := make(map[string][]PriceEntry)
	for _, item := range result {
		originName := originNamesMap[item.OriginId]
		if _, ok := pricesMap[originName]; !ok {
			pricesMap[originName] = make([]PriceEntry, 0)
		}

		pricesMap[originName] = append(pricesMap[originName], PriceEntry{
			CreatedAt: item.CreatedAt.Unix(),
			Value:     item.Price,
		})
	}

	for key, item := range pricesMap {
		response.Origins = append(response.Origins, OriginWithPrices{
			Origin: key,
			Prices: item,
		})
	}

	return &response, nil
}