feat: add invoice and alternative_componen management functionality

internal/mapper/alternative_component_mapper.go

@@ -0,0 +1,67 @@
+package mapper
+
+import (
+	"encoding/json"
+	"wm-backend/internal/models"
+	db "wm-backend/sqlc_gen"
+
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+func numericToString(n pgtype.Numeric) string {
+	if !n.Valid {
+		return ""
+	}
+	b, _ := json.Marshal(n)
+	return string(b)
+}
+
+func stringToNumeric(s string) pgtype.Numeric {
+	var n pgtype.Numeric
+	if s == "" {
+		return n
+	}
+	_ = json.Unmarshal([]byte(s), &n)
+	return n
+}
+
+func ToDomainAlternativeComponent(r db.AlternativeComponent) *models.AlternativeComponent {
+	return &models.AlternativeComponent{
+		ID:                     r.ID,
+		InvoiceConfigItemID:    r.InvoiceConfigItemID,
+		AlternativeComponentID: r.AlternativeComponentID,
+		ConversionRatio:        numericToString(r.ConversionRatio),
+		Priority:               r.Priority,
+		Note:                   r.Note.String,
+		Metadata:               r.Metadata,
+	}
+}
+
+func ToModelAlternativeComponent(r *models.AlternativeComponent) *db.CreateAlternativeComponentParams {
+	return &db.CreateAlternativeComponentParams{
+		InvoiceConfigItemID:    r.InvoiceConfigItemID,
+		AlternativeComponentID: r.AlternativeComponentID,
+		ConversionRatio:        stringToNumeric(r.ConversionRatio),
+		Priority:               r.Priority,
+		Note: pgtype.Text{
+			String: r.Note,
+			Valid:  r.Note != "",
+		},
+		Metadata: r.Metadata,
+	}
+}
+
+func ToUpdateModelAlternativeComponent(r *models.AlternativeComponent) *db.UpdateAlternativeComponentParams {
+	return &db.UpdateAlternativeComponentParams{
+		InvoiceConfigItemID:    r.InvoiceConfigItemID,
+		AlternativeComponentID: r.AlternativeComponentID,
+		ConversionRatio:        stringToNumeric(r.ConversionRatio),
+		Priority:               r.Priority,
+		Note: pgtype.Text{
+			String: r.Note,
+			Valid:  r.Note != "",
+		},
+		Metadata: r.Metadata,
+		ID:       r.ID,
+	}
+}