api discount and change tax

app/controllers/api/change_tax_controller.rb

@@ -0,0 +1,16 @@
+class Api::ChangeTaxController < Api::ApiController
+
+  def index
+    sale_id = params[:sale_id]
+    group_type = params[:group_type]
+    tax_type = params[:tax_type].present? ? params[:tax_type] : "no_tax"
+
+    sale = Sale.find(sale_id)
+
+    sale.compute_by_sale_items(sale.total_discount, nil, group_type, tax_type)
+
+    remark        = "Change tax to #{tax_type} for Sale ID #{sale_id} By #{current_login_employee.name}"
+    SaleAudit.record_audit_change_tax(sale_id,remark,current_login_employee.name)
+  end
+
+end