feat: add components management functionality

internal/mapper/component_mapper.go

@@ -0,0 +1,60 @@
+package mapper
+
+import (
+	"wm-backend/internal/models"
+	db "wm-backend/sqlc_gen"
+
+	"encoding/json"
+
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+func ToDomainComponent(r db.Component) *models.Component {
+	return &models.Component{
+		ID:              r.ID,
+		ComponentTypeID: r.ComponentTypeID,
+		Name:            r.Name,
+		Description:     r.Description.String,
+		Unit:            r.Unit,
+		TotalQuantity:   r.TotalQuantity,
+		MinQuantity:     r.MinQuantity,
+		Metadata:        json.RawMessage(r.Metadata),
+		CreatedAt:       r.CreatedAt,
+		UpdatedAt:       r.UpdatedAt,
+	}
+}
+
+func ToModelComponent(r *models.Component) *db.CreateComponentParams {
+	return &db.CreateComponentParams{
+		ComponentTypeID: r.ComponentTypeID,
+		Name:            r.Name,
+		Description: pgtype.Text{
+			String: r.Description,
+			Valid:  r.Description != "",
+		},
+		Unit:        r.Unit,
+		MinQuantity: r.MinQuantity,
+		Metadata:    []byte(r.Metadata),
+		CreatedAt:   r.CreatedAt,
+	}
+}
+
+func ToUpdateModelComponent(r *models.Component) *db.UpdateComponentParams {
+	var metadata []byte
+	if len(r.Metadata) > 0 {
+		metadata = []byte(r.Metadata)
+	}
+	return &db.UpdateComponentParams{
+		ComponentTypeID: r.ComponentTypeID,
+		Name:            r.Name,
+		Description: pgtype.Text{
+			String: r.Description,
+			Valid:  r.Description != "",
+		},
+		Unit:        r.Unit,
+		MinQuantity: r.MinQuantity,
+		Metadata:    metadata,
+		UpdatedAt:   r.UpdatedAt,
+		ID:          r.ID,
+	}
+}