sales and orders methods updates

app/models/sale.rb

@@ -1,4 +1,93 @@
 class Sale < ApplicationRecord
+  before_create :generate_receipt_no
   belongs_to :cashier
   belongs_to :customer
+  has_many :sale_items
+  has_many :sale_discounts
+  has_many :sale_taxes
+  has_many :sale_payments
+  has_many :sale_orders
+
+  def generate_invoice_from_order (order_no)
+  end
+
+  def generate_invoice_by_items (items)
+  end
+
+  def add_item (item)
+    #save sale_audit
+  end
+
+  def remove_item (item)
+    #save sale_audit
+
+  end
+
+  def apply_discount_item (promotion_id, item)
+  end
+
+  def apply_discount (discount_type, discount_code)
+    #save action to sale_audit
+  end
+
+  def accept_payment (payment_method, amount, payment_ref, payment_external_result)
+  end
+
+  def void_sales (void_by, reason, approval_code)
+    #save sale_audit
+  end
+
+  #compute - invoice total
+  def compute
+    sales_items = self.sale_items
+
+    #Computation Fields
+    total_items_price = 0
+    total_discounts = 0
+    total_taxable = 0
+    rounding_adjustment = 0
+
+    sales_items.each do |item|
+      #compute each item and added to total
+    end
+
+    apply_tax
+  end
+
+  def apply_tax
+    #if tax is not apply create new record
+    self.sale_taxes.each |existing_tax|
+      #delete existing and create new
+      existing_tax.delete
+    end
+
+    #tax_profile - list by order_by
+    tax_profiles = TaxProfile.all.order("order_by asc")
+
+
+    #Creat new tax records
+    tax_profiles.each do |tax|
+      sale_tax = SaleTax.new(:sale => self)
+      sale_tax.tax_name = tax.name
+      sale_tax.tax_rate = tax.rate
+      #include or execulive
+      sale_tax.tax_payable_amount =  self.total_amount * tax.rate
+      sale_tax.inclusive = tax.inclusive
+      sale_tax.save
+    end
+
+
+
+  end
+
+
+  private
+  #Generate new Receipt No when it is not assigned
+  def generate_receipt_no
+    #Date-Shift-
+    if !self.receipt_no.nil?
+      prefix = Date.now()
+      self.receipt_no = prefix.to_s + "/" + self.shit_id.to_s + "/" + SeedGenerator.new_receipt_no().to_s
+    end
+  end
 end