Add shipping settings and calculation

backend/internal/domain/shipping.go

@@ -0,0 +1,44 @@
+package domain
+
+import (
+	"time"
+
+	"github.com/gofrs/uuid/v5"
+)
+
+// ShippingMethodType defines supported fulfillment modes.
+type ShippingMethodType string
+
+const (
+	ShippingMethodPickup       ShippingMethodType = "pickup"
+	ShippingMethodOwnDelivery  ShippingMethodType = "own_delivery"
+	ShippingMethodThirdParty   ShippingMethodType = "third_party_delivery"
+	ShippingOptionTypePickup                      = "pickup"
+	ShippingOptionTypeDelivery                    = "delivery"
+)
+
+// ShippingMethod stores vendor configuration for pickup or delivery.
+type ShippingMethod struct {
+	ID                         uuid.UUID          `db:"id" json:"id"`
+	VendorID                   uuid.UUID          `db:"vendor_id" json:"vendor_id"`
+	Type                       ShippingMethodType `db:"type" json:"type"`
+	Active                     bool               `db:"active" json:"active"`
+	PreparationMinutes         int                `db:"preparation_minutes" json:"preparation_minutes"`
+	MaxRadiusKm                float64            `db:"max_radius_km" json:"max_radius_km"`
+	MinFeeCents                int64              `db:"min_fee_cents" json:"min_fee_cents"`
+	PricePerKmCents            int64              `db:"price_per_km_cents" json:"price_per_km_cents"`
+	FreeShippingThresholdCents *int64             `db:"free_shipping_threshold_cents" json:"free_shipping_threshold_cents,omitempty"`
+	PickupAddress              string             `db:"pickup_address" json:"pickup_address"`
+	PickupHours                string             `db:"pickup_hours" json:"pickup_hours"`
+	CreatedAt                  time.Time          `db:"created_at" json:"created_at"`
+	UpdatedAt                  time.Time          `db:"updated_at" json:"updated_at"`
+}
+
+// ShippingOption presents calculated options to the buyer.
+type ShippingOption struct {
+	Type             string  `json:"type"`
+	ValueCents       int64   `json:"value_cents"`
+	EstimatedMinutes int     `json:"estimated_minutes"`
+	Description      string  `json:"description"`
+	DistanceKm       float64 `json:"distance_km,omitempty"`
+}

backend/internal/http/handler/dto.go

@@ -144,6 +144,31 @@ type updateStatusRequest struct {
 	Status string `json:"status"`
 }
 
+type shippingMethodRequest struct {
+	Type                       string  `json:"type"`
+	Active                     bool    `json:"active"`
+	PreparationMinutes         int     `json:"preparation_minutes"`
+	MaxRadiusKm                float64 `json:"max_radius_km"`
+	MinFeeCents                int64   `json:"min_fee_cents"`
+	PricePerKmCents            int64   `json:"price_per_km_cents"`
+	FreeShippingThresholdCents *int64  `json:"free_shipping_threshold_cents,omitempty"`
+	PickupAddress              string  `json:"pickup_address,omitempty"`
+	PickupHours                string  `json:"pickup_hours,omitempty"`
+}
+
+type shippingSettingsRequest struct {
+	Methods []shippingMethodRequest `json:"methods"`
+}
+
+type shippingCalculateRequest struct {
+	VendorID       uuid.UUID  `json:"vendor_id"`
+	CartTotalCents int64      `json:"cart_total_cents"`
+	BuyerLatitude  *float64   `json:"buyer_latitude,omitempty"`
+	BuyerLongitude *float64   `json:"buyer_longitude,omitempty"`
+	AddressID      *uuid.UUID `json:"address_id,omitempty"`
+	PostalCode     string     `json:"postal_code,omitempty"`
+}
+
 // --- Utility Functions ---
 
 func writeJSON(w http.ResponseWriter, status int, v any) {

backend/internal/http/handler/handler_test.go

@@ -21,6 +21,7 @@ type MockRepository struct {
 	products  []domain.Product
 	users     []domain.User
 	orders    []domain.Order
+	shipping  []domain.ShippingMethod
 }
 
 func NewMockRepository() *MockRepository {
@@ -29,6 +30,7 @@ func NewMockRepository() *MockRepository {
 		products:  make([]domain.Product, 0),
 		users:     make([]domain.User, 0),
 		orders:    make([]domain.Order, 0),
+		shipping:  make([]domain.ShippingMethod, 0),
 	}
 }
 
@@ -232,6 +234,33 @@ func (m *MockRepository) AdminDashboard(ctx context.Context, since time.Time) (*
 	return &domain.AdminDashboard{}, nil
 }
 
+func (m *MockRepository) GetShippingMethodsByVendor(ctx context.Context, vendorID uuid.UUID) ([]domain.ShippingMethod, error) {
+	var methods []domain.ShippingMethod
+	for _, method := range m.shipping {
+		if method.VendorID == vendorID {
+			methods = append(methods, method)
+		}
+	}
+	return methods, nil
+}
+
+func (m *MockRepository) UpsertShippingMethods(ctx context.Context, methods []domain.ShippingMethod) error {
+	for _, method := range methods {
+		updated := false
+		for i, existing := range m.shipping {
+			if existing.VendorID == method.VendorID && existing.Type == method.Type {
+				m.shipping[i] = method
+				updated = true
+				break
+			}
+		}
+		if !updated {
+			m.shipping = append(m.shipping, method)
+		}
+	}
+	return nil
+}
+
 // MockPaymentGateway implements the PaymentGateway interface for testing
 type MockPaymentGateway struct{}
 

backend/internal/http/handler/shipping_handler.go

@@ -0,0 +1,195 @@
+package handler
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+
+	"github.com/gofrs/uuid/v5"
+
+	"github.com/saveinmed/backend-go/internal/domain"
+)
+
+// GetShippingSettings godoc
+// @Summary Get vendor shipping settings
+// @Description Returns pickup and delivery settings for a vendor.
+// @Tags Shipping
+// @Produce json
+// @Param vendor_id path string true "Vendor ID"
+// @Success 200 {array} domain.ShippingMethod
+// @Failure 400 {object} map[string]string
+// @Failure 403 {object} map[string]string
+// @Failure 500 {object} map[string]string
+// @Router /api/v1/shipping/settings/{vendor_id} [get]
+func (h *Handler) GetShippingSettings(w http.ResponseWriter, r *http.Request) {
+	vendorID, err := parseUUIDFromPath(r.URL.Path)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, err)
+		return
+	}
+
+	requester, err := getRequester(r)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, err)
+		return
+	}
+	if !strings.EqualFold(requester.Role, "Admin") {
+		if requester.CompanyID == nil || *requester.CompanyID != vendorID {
+			writeError(w, http.StatusForbidden, errors.New("not allowed to view shipping settings"))
+			return
+		}
+	}
+
+	methods, err := h.svc.GetShippingMethods(r.Context(), vendorID)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, methods)
+}
+
+// UpsertShippingSettings godoc
+// @Summary Update vendor shipping settings
+// @Description Stores pickup and delivery settings for a vendor.
+// @Tags Shipping
+// @Accept json
+// @Produce json
+// @Param vendor_id path string true "Vendor ID"
+// @Param payload body shippingSettingsRequest true "Shipping settings"
+// @Success 200 {array} domain.ShippingMethod
+// @Failure 400 {object} map[string]string
+// @Failure 403 {object} map[string]string
+// @Failure 500 {object} map[string]string
+// @Router /api/v1/shipping/settings/{vendor_id} [put]
+func (h *Handler) UpsertShippingSettings(w http.ResponseWriter, r *http.Request) {
+	vendorID, err := parseUUIDFromPath(r.URL.Path)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, err)
+		return
+	}
+
+	requester, err := getRequester(r)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, err)
+		return
+	}
+	if !strings.EqualFold(requester.Role, "Admin") {
+		if requester.CompanyID == nil || *requester.CompanyID != vendorID {
+			writeError(w, http.StatusForbidden, errors.New("not allowed to update shipping settings"))
+			return
+		}
+	}
+
+	var req shippingSettingsRequest
+	if err := decodeJSON(r.Context(), r, &req); err != nil {
+		writeError(w, http.StatusBadRequest, err)
+		return
+	}
+	if len(req.Methods) == 0 {
+		writeError(w, http.StatusBadRequest, errors.New("methods are required"))
+		return
+	}
+
+	methods := make([]domain.ShippingMethod, 0, len(req.Methods))
+	for _, method := range req.Methods {
+		methodType, err := parseShippingMethodType(method.Type)
+		if err != nil {
+			writeError(w, http.StatusBadRequest, err)
+			return
+		}
+		if method.PreparationMinutes < 0 {
+			writeError(w, http.StatusBadRequest, errors.New("preparation_minutes must be >= 0"))
+			return
+		}
+		if methodType != domain.ShippingMethodPickup {
+			if method.MaxRadiusKm <= 0 {
+				writeError(w, http.StatusBadRequest, errors.New("max_radius_km must be > 0 for delivery methods"))
+				return
+			}
+			if method.MinFeeCents < 0 || method.PricePerKmCents < 0 {
+				writeError(w, http.StatusBadRequest, errors.New("delivery pricing must be >= 0"))
+				return
+			}
+			if method.FreeShippingThresholdCents != nil && *method.FreeShippingThresholdCents <= 0 {
+				writeError(w, http.StatusBadRequest, errors.New("free_shipping_threshold_cents must be > 0"))
+				return
+			}
+		}
+		if methodType == domain.ShippingMethodPickup && method.Active {
+			if strings.TrimSpace(method.PickupAddress) == "" || strings.TrimSpace(method.PickupHours) == "" {
+				writeError(w, http.StatusBadRequest, errors.New("pickup_address and pickup_hours are required for active pickup"))
+				return
+			}
+		}
+		methods = append(methods, domain.ShippingMethod{
+			Type:                       methodType,
+			Active:                     method.Active,
+			PreparationMinutes:         method.PreparationMinutes,
+			MaxRadiusKm:                method.MaxRadiusKm,
+			MinFeeCents:                method.MinFeeCents,
+			PricePerKmCents:            method.PricePerKmCents,
+			FreeShippingThresholdCents: method.FreeShippingThresholdCents,
+			PickupAddress:              strings.TrimSpace(method.PickupAddress),
+			PickupHours:                strings.TrimSpace(method.PickupHours),
+		})
+	}
+
+	updated, err := h.svc.UpsertShippingMethods(r.Context(), vendorID, methods)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, updated)
+}
+
+// CalculateShipping godoc
+// @Summary Calculate shipping options
+// @Description Calculates shipping or pickup options based on vendor config and buyer location.
+// @Tags Shipping
+// @Accept json
+// @Produce json
+// @Param payload body shippingCalculateRequest true "Calculation inputs"
+// @Success 200 {array} domain.ShippingOption
+// @Failure 400 {object} map[string]string
+// @Failure 500 {object} map[string]string
+// @Router /api/v1/shipping/calculate [post]
+func (h *Handler) CalculateShipping(w http.ResponseWriter, r *http.Request) {
+	var req shippingCalculateRequest
+	if err := decodeJSON(r.Context(), r, &req); err != nil {
+		writeError(w, http.StatusBadRequest, err)
+		return
+	}
+
+	if req.VendorID == uuid.Nil {
+		writeError(w, http.StatusBadRequest, errors.New("vendor_id is required"))
+		return
+	}
+	if req.BuyerLatitude == nil || req.BuyerLongitude == nil {
+		if req.AddressID != nil || req.PostalCode != "" {
+			writeError(w, http.StatusBadRequest, errors.New("address_id or postal_code geocoding is not supported; provide buyer_latitude and buyer_longitude"))
+			return
+		}
+		writeError(w, http.StatusBadRequest, errors.New("buyer_latitude and buyer_longitude are required"))
+		return
+	}
+
+	options, err := h.svc.CalculateShippingOptions(r.Context(), req.VendorID, *req.BuyerLatitude, *req.BuyerLongitude, req.CartTotalCents)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, options)
+}
+
+func parseShippingMethodType(value string) (domain.ShippingMethodType, error) {
+	switch strings.ToLower(strings.TrimSpace(value)) {
+	case string(domain.ShippingMethodPickup):
+		return domain.ShippingMethodPickup, nil
+	case string(domain.ShippingMethodOwnDelivery):
+		return domain.ShippingMethodOwnDelivery, nil
+	case string(domain.ShippingMethodThirdParty):
+		return domain.ShippingMethodThirdParty, nil
+	default:
+		return "", errors.New("invalid shipping method type")
+	}
+}

backend/internal/repository/postgres/migrations/0002_shipping_methods.sql

@@ -0,0 +1,16 @@
+CREATE TABLE IF NOT EXISTS shipping_methods (
+    id UUID PRIMARY KEY,
+    vendor_id UUID NOT NULL REFERENCES companies(id),
+    type TEXT NOT NULL,
+    active BOOLEAN NOT NULL DEFAULT FALSE,
+    preparation_minutes INT NOT NULL DEFAULT 0,
+    max_radius_km DOUBLE PRECISION NOT NULL DEFAULT 0,
+    min_fee_cents BIGINT NOT NULL DEFAULT 0,
+    price_per_km_cents BIGINT NOT NULL DEFAULT 0,
+    free_shipping_threshold_cents BIGINT,
+    pickup_address TEXT,
+    pickup_hours TEXT,
+    created_at TIMESTAMPTZ NOT NULL,
+    updated_at TIMESTAMPTZ NOT NULL,
+    UNIQUE (vendor_id, type)
+);

backend/internal/repository/postgres/postgres.go

@@ -952,3 +952,55 @@ func (r *Repository) AdminDashboard(ctx context.Context, since time.Time) (*doma
 
 	return &domain.AdminDashboard{GMVCents: totalGMV, NewCompanies: newCompanies, WindowStartAt: since}, nil
 }
+
+func (r *Repository) GetShippingMethodsByVendor(ctx context.Context, vendorID uuid.UUID) ([]domain.ShippingMethod, error) {
+	query := `SELECT id, vendor_id, type, active, preparation_minutes, max_radius_km, min_fee_cents, price_per_km_cents, free_shipping_threshold_cents, pickup_address, pickup_hours, created_at, updated_at
+FROM shipping_methods WHERE vendor_id = $1 ORDER BY type`
+	var methods []domain.ShippingMethod
+	if err := r.db.SelectContext(ctx, &methods, query, vendorID); err != nil {
+		return nil, err
+	}
+	return methods, nil
+}
+
+func (r *Repository) UpsertShippingMethods(ctx context.Context, methods []domain.ShippingMethod) error {
+	if len(methods) == 0 {
+		return nil
+	}
+	query := `INSERT INTO shipping_methods (id, vendor_id, type, active, preparation_minutes, max_radius_km, min_fee_cents, price_per_km_cents, free_shipping_threshold_cents, pickup_address, pickup_hours, created_at, updated_at)
+VALUES (:id, :vendor_id, :type, :active, :preparation_minutes, :max_radius_km, :min_fee_cents, :price_per_km_cents, :free_shipping_threshold_cents, :pickup_address, :pickup_hours, :created_at, :updated_at)
+ON CONFLICT (vendor_id, type) DO UPDATE
+SET active = EXCLUDED.active,
+    preparation_minutes = EXCLUDED.preparation_minutes,
+    max_radius_km = EXCLUDED.max_radius_km,
+    min_fee_cents = EXCLUDED.min_fee_cents,
+    price_per_km_cents = EXCLUDED.price_per_km_cents,
+    free_shipping_threshold_cents = EXCLUDED.free_shipping_threshold_cents,
+    pickup_address = EXCLUDED.pickup_address,
+    pickup_hours = EXCLUDED.pickup_hours,
+    updated_at = EXCLUDED.updated_at`
+
+	tx, err := r.db.BeginTxx(ctx, nil)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err != nil {
+			_ = tx.Rollback()
+		}
+	}()
+
+	now := time.Now().UTC()
+	for i := range methods {
+		methods[i].CreatedAt = now
+		methods[i].UpdatedAt = now
+		if _, err = tx.NamedExecContext(ctx, query, methods[i]); err != nil {
+			return err
+		}
+	}
+
+	if err = tx.Commit(); err != nil {
+		return err
+	}
+	return nil
+}

backend/internal/server/server.go

@@ -110,6 +110,9 @@ func New(cfg config.Config) (*Server, error) {
 	mux.Handle("POST /api/v1/cart", chain(http.HandlerFunc(h.AddToCart), middleware.Logger, middleware.Gzip, auth))
 	mux.Handle("GET /api/v1/cart", chain(http.HandlerFunc(h.GetCart), middleware.Logger, middleware.Gzip, auth))
 	mux.Handle("DELETE /api/v1/cart/", chain(http.HandlerFunc(h.DeleteCartItem), middleware.Logger, middleware.Gzip, auth))
+	mux.Handle("GET /api/v1/shipping/settings/{vendor_id}", chain(http.HandlerFunc(h.GetShippingSettings), middleware.Logger, middleware.Gzip, auth))
+	mux.Handle("PUT /api/v1/shipping/settings/{vendor_id}", chain(http.HandlerFunc(h.UpsertShippingSettings), middleware.Logger, middleware.Gzip, auth))
+	mux.Handle("POST /api/v1/shipping/calculate", chain(http.HandlerFunc(h.CalculateShipping), middleware.Logger, middleware.Gzip))
 
 	mux.Handle("GET /docs/", httpSwagger.Handler(httpSwagger.URL("/docs/doc.json")))
 

backend/internal/usecase/usecase.go

@@ -3,6 +3,7 @@ package usecase
 import (
 	"context"
 	"errors"
+	"math"
 	"strings"
 	"time"
 
@@ -55,6 +56,8 @@ type Repository interface {
 	GetCompanyRating(ctx context.Context, companyID uuid.UUID) (*domain.CompanyRating, error)
 	SellerDashboard(ctx context.Context, sellerID uuid.UUID) (*domain.SellerDashboard, error)
 	AdminDashboard(ctx context.Context, since time.Time) (*domain.AdminDashboard, error)
+	GetShippingMethodsByVendor(ctx context.Context, vendorID uuid.UUID) ([]domain.ShippingMethod, error)
+	UpsertShippingMethods(ctx context.Context, methods []domain.ShippingMethod) error
 }
 
 // PaymentGateway abstracts Mercado Pago integration.
@@ -108,6 +111,96 @@ func (s *Service) GetCompany(ctx context.Context, id uuid.UUID) (*domain.Company
 	return s.repo.GetCompany(ctx, id)
 }
 
+func (s *Service) GetShippingMethods(ctx context.Context, vendorID uuid.UUID) ([]domain.ShippingMethod, error) {
+	return s.repo.GetShippingMethodsByVendor(ctx, vendorID)
+}
+
+func (s *Service) UpsertShippingMethods(ctx context.Context, vendorID uuid.UUID, methods []domain.ShippingMethod) ([]domain.ShippingMethod, error) {
+	if len(methods) == 0 {
+		return nil, errors.New("shipping methods are required")
+	}
+	for i := range methods {
+		if methods[i].Type == "" {
+			return nil, errors.New("shipping method type is required")
+		}
+		if methods[i].ID == uuid.Nil {
+			methods[i].ID = uuid.Must(uuid.NewV7())
+		}
+		methods[i].VendorID = vendorID
+	}
+	if err := s.repo.UpsertShippingMethods(ctx, methods); err != nil {
+		return nil, err
+	}
+	return s.repo.GetShippingMethodsByVendor(ctx, vendorID)
+}
+
+func (s *Service) CalculateShippingOptions(ctx context.Context, vendorID uuid.UUID, buyerLat, buyerLng float64, cartTotalCents int64) ([]domain.ShippingOption, error) {
+	company, err := s.repo.GetCompany(ctx, vendorID)
+	if err != nil {
+		return nil, err
+	}
+	if company == nil {
+		return nil, errors.New("vendor not found")
+	}
+
+	methods, err := s.repo.GetShippingMethodsByVendor(ctx, vendorID)
+	if err != nil {
+		return nil, err
+	}
+
+	distance := domain.HaversineDistance(company.Latitude, company.Longitude, buyerLat, buyerLng)
+
+	var options []domain.ShippingOption
+	for _, method := range methods {
+		if !method.Active {
+			continue
+		}
+		switch method.Type {
+		case domain.ShippingMethodPickup:
+			description := "Pickup at seller location"
+			if method.PickupAddress != "" {
+				description = "Pickup at " + method.PickupAddress
+			}
+			if method.PickupHours != "" {
+				description += " (" + method.PickupHours + ")"
+			}
+			options = append(options, domain.ShippingOption{
+				Type:             domain.ShippingOptionTypePickup,
+				ValueCents:       0,
+				EstimatedMinutes: method.PreparationMinutes,
+				Description:      description,
+				DistanceKm:       distance,
+			})
+		case domain.ShippingMethodOwnDelivery, domain.ShippingMethodThirdParty:
+			if method.MaxRadiusKm > 0 && distance > method.MaxRadiusKm {
+				continue
+			}
+			variableCost := int64(math.Round(distance * float64(method.PricePerKmCents)))
+			price := method.MinFeeCents
+			if variableCost > price {
+				price = variableCost
+			}
+			if method.FreeShippingThresholdCents != nil && cartTotalCents >= *method.FreeShippingThresholdCents {
+				price = 0
+			}
+			estimatedMinutes := method.PreparationMinutes + int(math.Round(distance*5))
+			description := "Delivery via own fleet"
+			if method.Type == domain.ShippingMethodThirdParty {
+				description = "Delivery via third-party courier"
+			}
+			options = append(options, domain.ShippingOption{
+				Type:             domain.ShippingOptionTypeDelivery,
+				ValueCents:       price,
+				EstimatedMinutes: estimatedMinutes,
+				Description:      description,
+				DistanceKm:       distance,
+			})
+		}
+	}
+
+	return options, nil
+}
+
 func (s *Service) UpdateCompany(ctx context.Context, company *domain.Company) error {
 	return s.repo.UpdateCompany(ctx, company)
 }

backend/internal/usecase/usecase_test.go

@@ -17,6 +17,7 @@ type MockRepository struct {
 	orders    []domain.Order
 	cartItems []domain.CartItem
 	reviews   []domain.Review
+	shipping  []domain.ShippingMethod
 }
 
 func NewMockRepository() *MockRepository {
@@ -27,6 +28,7 @@ func NewMockRepository() *MockRepository {
 		orders:    make([]domain.Order, 0),
 		cartItems: make([]domain.CartItem, 0),
 		reviews:   make([]domain.Review, 0),
+		shipping:  make([]domain.ShippingMethod, 0),
 	}
 }
 
@@ -251,6 +253,33 @@ func (m *MockRepository) AdminDashboard(ctx context.Context, since time.Time) (*
 	return &domain.AdminDashboard{GMVCents: 1000000}, nil
 }
 
+func (m *MockRepository) GetShippingMethodsByVendor(ctx context.Context, vendorID uuid.UUID) ([]domain.ShippingMethod, error) {
+	var methods []domain.ShippingMethod
+	for _, method := range m.shipping {
+		if method.VendorID == vendorID {
+			methods = append(methods, method)
+		}
+	}
+	return methods, nil
+}
+
+func (m *MockRepository) UpsertShippingMethods(ctx context.Context, methods []domain.ShippingMethod) error {
+	for _, method := range methods {
+		updated := false
+		for i, existing := range m.shipping {
+			if existing.VendorID == method.VendorID && existing.Type == method.Type {
+				m.shipping[i] = method
+				updated = true
+				break
+			}
+		}
+		if !updated {
+			m.shipping = append(m.shipping, method)
+		}
+	}
+	return nil
+}
+
 // MockPaymentGateway for testing
 type MockPaymentGateway struct{}