Implement produce service

internal/produce/produce.go

@@ -0,0 +1,77 @@
+package produce
+
+import (
+	"strings"
+
+	"github.com/davidlick/supermarket-api/internal/interfaces"
+	"github.com/davidlick/supermarket-api/pkg/ramdb"
+)
+
+type service struct {
+	db interfaces.RamDB
+}
+
+// NewService creates a new produce service for storing produce items.
+func NewService(db interfaces.RamDB) *service {
+	return &service{
+		db: db,
+	}
+}
+
+// Add adds the Items to the database.
+func (s *service) Add(items []Item) error {
+	for _, item := range items {
+		rec, err := ramdb.NewRecord(strings.ToLower(item.Code), KeyProduceCode, item)
+		if err != nil {
+			return err
+		}
+
+		err = s.db.Insert(rec)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// Remove removes the item from the database.
+func (s *service) Remove(item Item) error {
+	rec, err := ramdb.NewRecord(strings.ToLower(item.Code), KeyProduceCode, item)
+	if err != nil {
+		return err
+	}
+
+	return s.db.Delete(rec)
+}
+
+// Get fetches the produceCode from the database.
+func (s *service) Get(produceCode string) (item Item, err error) {
+	rec, err := s.db.Get(KeyProduceCode, strings.ToLower(produceCode))
+	if err != nil {
+		return
+	}
+
+	err = rec.Deserialize(&item)
+	return
+}
+
+// All returns all produce items stored in the database.
+func (s *service) All() (items []Item, err error) {
+	recs, err := s.db.Select(KeyProduceCode)
+	if err != nil {
+		return
+	}
+
+	for _, rec := range recs {
+		var item Item
+		err = rec.Deserialize(&item)
+		if err != nil {
+			return
+		}
+
+		items = append(items, item)
+	}
+
+	return
+}