73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
package pricing
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import (
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"context"
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"github.com/google/uuid"
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)
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type Service struct {
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repo Repository
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}
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func NewService(repo Repository) *Service {
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return &Service{repo: repo}
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}
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func (s *Service) ListByProduct(ctx context.Context, productID uuid.UUID) ([]*PriceTier, error) {
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return s.repo.ListByProduct(ctx, productID)
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}
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func (s *Service) Get(ctx context.Context, id uuid.UUID) (*PriceTier, error) {
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return s.repo.FindByID(ctx, id)
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}
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func (s *Service) Create(ctx context.Context, productID, unitID uuid.UUID, quantity float64, priceCents int64, position int) (*PriceTier, error) {
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t := &PriceTier{
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ID: uuid.New(),
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ProductID: productID,
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UnitID: unitID,
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Quantity: quantity,
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PriceCents: priceCents,
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Position: position,
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}
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if err := s.repo.Create(ctx, t); err != nil {
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return nil, err
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}
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return t, nil
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}
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func (s *Service) Update(ctx context.Context, id uuid.UUID, unitID uuid.UUID, quantity float64, priceCents int64, position int) (*PriceTier, error) {
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t, err := s.repo.FindByID(ctx, id)
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if err != nil {
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return nil, err
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}
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t.UnitID = unitID
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t.Quantity = quantity
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t.PriceCents = priceCents
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t.Position = position
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if err := s.repo.Update(ctx, t); err != nil {
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return nil, err
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}
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return t, nil
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}
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func (s *Service) Delete(ctx context.Context, id uuid.UUID) error {
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return s.repo.Delete(ctx, id)
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}
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// PriceForQuantity is the centralized pricing calculation used by the
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// orders module: given a chosen tier and how many of that tier package the
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// customer wants, it returns the authoritative total in cents. The
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// frontend never gets to supply a price directly.
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func (s *Service) PriceForQuantity(ctx context.Context, tierID uuid.UUID, multiplier int64) (totalCents int64, tier *PriceTier, err error) {
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t, err := s.repo.FindByID(ctx, tierID)
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if err != nil {
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return 0, nil, err
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}
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if multiplier < 1 {
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multiplier = 1
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}
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return t.PriceCents * multiplier, t, nil
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}
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