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|
module SuperGood
module SolidusTaxJar
class TaxCalculator
def self.default_api
::SuperGood::SolidusTaxJar::API.new
end
def initialize(order, api: self.class.default_api)
@order = order
@api = api
end
def calculate
return no_tax if order.tax_address.empty?
Spree::Tax::OrderTax.new(
order_id: order.id,
line_item_taxes: line_item_taxes,
shipment_taxes: shipment_taxes
)
end
private
attr_reader :order, :api
def line_item_taxes
@line_item_taxes ||=
if taxjar_breakdown
taxjar_breakdown.line_items.map do |line_item|
Spree::Tax::ItemTax.new(
item_id: line_item.id.to_i,
label: "Sales Tax",
tax_rate: tax_rate,
amount: line_item.tax_collectable,
included_in_price: false
)
end
else
[]
end
end
def shipment_taxes
@shipment_taxes ||=
if (total_shipping_tax = taxjar_tax.shipping) != 0
# Distribute shipping tax across shipments:
# TaxJar does not provide a breakdown of shipping taxes, so we have
# to proportionally distribute the tax across the shipments,
# accounting for rounding errors.
tax_items = []
remaining_tax = total_shipping_tax
shipments = order.shipments.to_a
total_shipping_cost = shipments.sum(&:total_before_tax)
shipments[0...-1].each do |shipment|
percentage_of_tax = shipment.total_before_tax / total_shipping_cost
shipping_tax = (percentage_of_tax * total_shipping_tax).round(2)
remaining_tax -= shipping_tax
tax_items << ::Spree::Tax::ItemTax.new(
item_id: shipment.id,
label: "Sales Tax",
tax_rate: tax_rate,
amount: shipping_tax,
included_in_price: false
)
end
tax_items << ::Spree::Tax::ItemTax.new(
item_id: shipments.last.id,
label: "Sales Tax",
tax_rate: tax_rate,
amount: remaining_tax,
included_in_price: false
)
tax_items
else
[]
end
end
def taxjar_breakdown
@taxjar_breakdown ||= taxjar_tax.breakdown
end
def taxjar_tax
@taxjar_taxes ||= api.tax_for(order)
end
def no_tax
Spree::Tax::OrderTax.new(
order_id: order.id,
line_item_taxes: [],
shipment_taxes: []
)
end
def tax_rate
Spree::TaxRate.find_by(name: "Sales Tax")
end
end
end
end
|
