brotherton-erpnext/erpnext/controllers/taxes_and_totals.py

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# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
# License: GNU General Public License v3. See license.txt
from __future__ import unicode_literals
import json
import frappe
from frappe import _
from frappe.utils import cint, flt, rounded
from erpnext.setup.utils import get_company_currency
from erpnext.controllers.accounts_controller import validate_conversion_rate, \
validate_taxes_and_charges, validate_inclusive_tax
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class calculate_taxes_and_totals(object):
def __init__(self, doc):
self.doc = doc
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self.calculate()
def calculate(self):
self.discount_amount_applied = False
self._calculate()
if self.doc.meta.get_field("discount_amount"):
self.apply_discount_amount()
if self.doc.doctype in ["Sales Invoice", "Purchase Invoice"]:
self.calculate_total_advance()
def _calculate(self):
self.calculate_item_values()
self.initialize_taxes()
self.determine_exclusive_rate()
self.calculate_net_total()
self.calculate_taxes()
self.calculate_totals()
self._cleanup()
def validate_conversion_rate(self):
# validate conversion rate
company_currency = get_company_currency(self.doc.company)
if not self.doc.currency or self.doc.currency == company_currency:
self.doc.currency = company_currency
self.doc.conversion_rate = 1.0
else:
validate_conversion_rate(self.doc.currency, self.doc.conversion_rate,
self.doc.meta.get_label("conversion_rate"), self.doc.company)
self.doc.conversion_rate = flt(self.doc.conversion_rate)
def calculate_item_values(self):
if not self.discount_amount_applied:
for item in self.doc.get("items"):
self.doc.round_floats_in(item)
if item.discount_percentage == 100:
item.rate = 0.0
elif not item.rate:
item.rate = flt(item.price_list_rate *
(1.0 - (item.discount_percentage / 100.0)), item.precision("rate"))
item.net_rate = item.rate
item.amount = flt(item.rate * item.qty, item.precision("amount"))
item.net_amount = item.amount
self._set_in_company_currency(item, ["price_list_rate", "rate", "net_rate", "amount", "net_amount"])
item.item_tax_amount = 0.0
def _set_in_company_currency(self, doc, fields):
"""set values in base currency"""
for f in fields:
val = flt(flt(doc.get(f), doc.precision(f)) * self.doc.conversion_rate, doc.precision("base_" + f))
doc.set("base_" + f, val)
def initialize_taxes(self):
for tax in self.doc.get("taxes"):
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if not self.discount_amount_applied:
validate_taxes_and_charges(tax)
validate_inclusive_tax(tax, self.doc)
tax.item_wise_tax_detail = {}
tax_fields = ["total", "tax_amount_after_discount_amount",
"tax_amount_for_current_item", "grand_total_for_current_item",
"tax_fraction_for_current_item", "grand_total_fraction_for_current_item"]
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if tax.charge_type != "Actual" and \
not (self.discount_amount_applied and self.doc.apply_discount_on=="Grand Total"):
tax_fields.append("tax_amount")
for fieldname in tax_fields:
tax.set(fieldname, 0.0)
self.doc.round_floats_in(tax)
def determine_exclusive_rate(self):
if not any((cint(tax.included_in_print_rate) for tax in self.doc.get("taxes"))):
return
for item in self.doc.get("items"):
item_tax_map = self._load_item_tax_rate(item.item_tax_rate)
cumulated_tax_fraction = 0
for i, tax in enumerate(self.doc.get("taxes")):
tax.tax_fraction_for_current_item = self.get_current_tax_fraction(tax, item_tax_map)
if i==0:
tax.grand_total_fraction_for_current_item = 1 + tax.tax_fraction_for_current_item
else:
tax.grand_total_fraction_for_current_item = \
self.doc.get("taxes")[i-1].grand_total_fraction_for_current_item \
+ tax.tax_fraction_for_current_item
cumulated_tax_fraction += tax.tax_fraction_for_current_item
if cumulated_tax_fraction and not self.discount_amount_applied and item.qty:
item.net_amount = flt(item.amount / (1 + cumulated_tax_fraction), item.precision("net_amount"))
item.net_rate = flt(item.net_amount / item.qty, item.precision("net_rate"))
item.discount_percentage = flt(item.discount_percentage, item.precision("discount_percentage"))
self._set_in_company_currency(item, ["net_rate", "net_amount"])
# below part need to be fixed???
# if item.discount_percentage == 100:
# item.price_list_rate = item.net_rate
# item.base_price_list_rate = flt(item.price_list_rate*self.doc.conversion_rate,
# self.doc.precision("base_price_list_rate", item))
# item.rate = item.base_rate = item.net_rate = item.base_net_rate = 0.0
# else:
# item.base_price_list_rate = flt(item.net_rate / (1 - (item.discount_percentage / 100.0)),
# self.doc.precision("price_list_rate", item))
def _load_item_tax_rate(self, item_tax_rate):
return json.loads(item_tax_rate) if item_tax_rate else {}
def get_current_tax_fraction(self, tax, item_tax_map):
"""
Get tax fraction for calculating tax exclusive amount
from tax inclusive amount
"""
current_tax_fraction = 0
if cint(tax.included_in_print_rate):
tax_rate = self._get_tax_rate(tax, item_tax_map)
if tax.charge_type == "On Net Total":
current_tax_fraction = tax_rate / 100.0
elif tax.charge_type == "On Previous Row Amount":
current_tax_fraction = (tax_rate / 100.0) * \
self.doc.get("taxes")[cint(tax.row_id) - 1].tax_fraction_for_current_item
elif tax.charge_type == "On Previous Row Total":
current_tax_fraction = (tax_rate / 100.0) * \
self.doc.get("taxes")[cint(tax.row_id) - 1].grand_total_fraction_for_current_item
return current_tax_fraction
def _get_tax_rate(self, tax, item_tax_map):
if item_tax_map.has_key(tax.account_head):
return flt(item_tax_map.get(tax.account_head), self.doc.precision("rate", tax))
else:
return tax.rate
def calculate_net_total(self):
self.doc.total = self.doc.base_total = self.doc.net_total = self.doc.base_net_total = 0.0
for item in self.doc.get("items"):
self.doc.total += item.amount
self.doc.base_total += item.base_amount
self.doc.net_total += item.net_amount
self.doc.base_net_total += item.base_net_amount
self.doc.round_floats_in(self.doc, ["total", "base_total", "net_total", "base_net_total"])
def calculate_taxes(self):
# maintain actual tax rate based on idx
actual_tax_dict = dict([[tax.idx, flt(tax.tax_amount, tax.precision("tax_amount"))]
for tax in self.doc.get("taxes") if tax.charge_type == "Actual"])
for n, item in enumerate(self.doc.get("items")):
item_tax_map = self._load_item_tax_rate(item.item_tax_rate)
for i, tax in enumerate(self.doc.get("taxes")):
# tax_amount represents the amount of tax for the current step
current_tax_amount = self.get_current_tax_amount(item, tax, item_tax_map)
# Adjust divisional loss to the last item
if tax.charge_type == "Actual":
actual_tax_dict[tax.idx] -= current_tax_amount
if n == len(self.doc.get("items")) - 1:
current_tax_amount += actual_tax_dict[tax.idx]
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# accumulate tax amount into tax.tax_amount
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if tax.charge_type != "Actual" and \
not (self.discount_amount_applied and self.doc.apply_discount_on=="Grand Total"):
tax.tax_amount += current_tax_amount
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# store tax_amount for current item as it will be used for
# charge type = 'On Previous Row Amount'
tax.tax_amount_for_current_item = current_tax_amount
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# set tax after discount
tax.tax_amount_after_discount_amount += current_tax_amount
if getattr(tax, "category", None):
# if just for valuation, do not add the tax amount in total
# hence, setting it as 0 for further steps
current_tax_amount = 0.0 if (tax.category == "Valuation") \
else current_tax_amount
current_tax_amount *= -1.0 if (tax.add_deduct_tax == "Deduct") else 1.0
# Calculate tax.total viz. grand total till that step
# note: grand_total_for_current_item contains the contribution of
# item's amount, previously applied tax and the current tax on that item
if i==0:
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tax.grand_total_for_current_item = flt(item.net_amount + current_tax_amount, tax.precision("total"))
else:
tax.grand_total_for_current_item = \
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flt(self.doc.get("taxes")[i-1].grand_total_for_current_item + current_tax_amount, tax.precision("total"))
# in tax.total, accumulate grand total of each item
tax.total += tax.grand_total_for_current_item
# set precision in the last item iteration
if n == len(self.doc.get("items")) - 1:
self.round_off_totals(tax)
# adjust Discount Amount loss in last tax iteration
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if i == (len(self.doc.get("taxes")) - 1) and self.discount_amount_applied \
and self.doc.discount_amount:
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self.adjust_discount_amount_loss(tax)
def get_current_tax_amount(self, item, tax, item_tax_map):
tax_rate = self._get_tax_rate(tax, item_tax_map)
current_tax_amount = 0.0
if tax.charge_type == "Actual":
# distribute the tax amount proportionally to each item row
actual = flt(tax.tax_amount, tax.precision("tax_amount"))
current_tax_amount = item.net_amount*actual / self.doc.net_total if self.doc.net_total else 0.0
elif tax.charge_type == "On Net Total":
current_tax_amount = (tax_rate / 100.0) * item.net_amount
elif tax.charge_type == "On Previous Row Amount":
current_tax_amount = (tax_rate / 100.0) * \
self.doc.get("taxes")[cint(tax.row_id) - 1].tax_amount_for_current_item
elif tax.charge_type == "On Previous Row Total":
current_tax_amount = (tax_rate / 100.0) * \
self.doc.get("taxes")[cint(tax.row_id) - 1].grand_total_for_current_item
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current_tax_amount = flt(current_tax_amount, tax.precision("tax_amount"))
self.set_item_wise_tax(item, tax, tax_rate, current_tax_amount)
return current_tax_amount
def set_item_wise_tax(self, item, tax, tax_rate, current_tax_amount):
# store tax breakup for each item
key = item.item_code or item.item_name
item_wise_tax_amount = current_tax_amount*self.doc.conversion_rate
if tax.item_wise_tax_detail.get(key):
item_wise_tax_amount += tax.item_wise_tax_detail[key][1]
tax.item_wise_tax_detail[key] = [tax_rate,flt(item_wise_tax_amount, tax.precision("base_tax_amount"))]
def round_off_totals(self, tax):
tax.total = flt(tax.total, tax.precision("total"))
tax.tax_amount = flt(tax.tax_amount, tax.precision("tax_amount"))
tax.tax_amount_after_discount_amount = flt(tax.tax_amount_after_discount_amount, tax.precision("tax_amount"))
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self._set_in_company_currency(tax, ["total", "tax_amount", "tax_amount_after_discount_amount"])
def adjust_discount_amount_loss(self, tax):
discount_amount_loss = self.doc.grand_total - flt(self.doc.discount_amount) - tax.total
tax.tax_amount_after_discount_amount = flt(tax.tax_amount_after_discount_amount +
discount_amount_loss, self.doc.precision("tax_amount", tax))
tax.total = flt(tax.total + discount_amount_loss, self.doc.precision("total", tax))
def calculate_totals(self):
self.doc.grand_total = flt(self.doc.get("taxes")[-1].total
if self.doc.get("taxes") else self.doc.net_total)
if self.doc.doctype in ["Quotation", "Sales Order", "Delivery Note", "Sales Invoice"]:
self.doc.base_grand_total = flt(self.doc.grand_total * self.doc.conversion_rate) \
if self.doc.total_taxes_and_charges else self.doc.base_net_total
else:
self.doc.taxes_and_charges_added, self.taxes_and_charges_deducted = 0.0, 0.0
for tax in self.doc.get("taxes"):
if tax.category in ["Valuation and Total", "Total"]:
if tax.add_deduct_tax == "Add":
self.doc.taxes_and_charges_added += flt(tax.tax_amount)
else:
self.doc.taxes_and_charges_deducted += flt(tax.tax_amount)
self.doc.round_floats_in(self.doc, ["taxes_and_charges_added", "taxes_and_charges_deducted"])
self.doc.base_grand_total = flt(self.doc.grand_total * self.doc.conversion_rate) \
if (self.doc.taxes_and_charges_added or self.doc.taxes_and_charges_deducted) \
else self.doc.base_net_total
self._set_in_company_currency(self.doc, ["taxes_and_charges_added", "taxes_and_charges_deducted"])
self.doc.total_taxes_and_charges = flt(self.doc.grand_total - self.doc.net_total,
self.doc.precision("total_taxes_and_charges"))
self._set_in_company_currency(self.doc, ["total_taxes_and_charges"])
self.doc.round_floats_in(self.doc, ["grand_total", "base_grand_total"])
if self.doc.meta.get_field("rounded_total"):
self.doc.rounded_total = rounded(self.doc.grand_total)
if self.doc.meta.get_field("base_rounded_total"):
self.doc.base_rounded_total = rounded(self.doc.base_grand_total)
def _cleanup(self):
for tax in self.doc.get("taxes"):
tax.item_wise_tax_detail = json.dumps(tax.item_wise_tax_detail, separators=(',', ':'))
def apply_discount_amount(self):
if self.doc.discount_amount:
if not self.doc.apply_discount_on:
frappe.throw(_("Please select Apply Discount On"))
self.doc.base_discount_amount = flt(self.doc.discount_amount * self.doc.conversion_rate,
self.doc.precision("base_discount_amount"))
total_for_discount_amount = self.get_total_for_discount_amount()
taxes = self.doc.get("taxes")
net_total = 0
if total_for_discount_amount:
# calculate item amount after Discount Amount
for i, item in enumerate(self.doc.get("items")):
distributed_amount = flt(self.doc.discount_amount) * \
item.net_amount / total_for_discount_amount
item.net_amount = flt(item.net_amount - distributed_amount, item.precision("net_amount"))
net_total += item.net_amount
# discount amount rounding loss adjustment if no taxes
if (not taxes or self.doc.apply_discount_on == "Net Total") \
and i == len(self.doc.get("items")) - 1:
discount_amount_loss = flt(self.doc.total - net_total - self.doc.discount_amount,
self.doc.precision("net_total"))
item.net_amount = flt(item.net_amount + discount_amount_loss,
item.precision("net_amount"))
item.net_rate = flt(item.net_amount / item.qty, item.precision("net_rate"))
self._set_in_company_currency(item, ["net_rate", "net_amount"])
self.discount_amount_applied = True
self._calculate()
else:
self.doc.base_discount_amount = 0
def get_total_for_discount_amount(self):
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if self.doc.apply_discount_on == "Net Total":
return self.doc.net_total
else:
actual_taxes_dict = {}
for tax in self.doc.get("taxes"):
if tax.charge_type == "Actual":
actual_taxes_dict.setdefault(tax.idx, tax.tax_amount)
elif tax.row_id in actual_taxes_dict:
actual_tax_amount = flt(actual_taxes_dict.get(tax.row_id, 0)) * flt(tax.rate) / 100
actual_taxes_dict.setdefault(tax.idx, actual_tax_amount)
return flt(self.doc.grand_total - sum(actual_taxes_dict.values()), self.doc.precision("grand_total"))
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def calculate_total_advance(self):
if self.doc.docstatus < 2:
total_allocated_amount = sum([flt(adv.allocated_amount, adv.precision("allocated_amount"))
for adv in self.doc.get("advances")])
self.doc.total_advance = flt(total_allocated_amount, self.doc.precision("total_advance"))
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if self.doc.docstatus == 0:
self.calculate_outstanding_amount()
def calculate_outstanding_amount(self):
# NOTE:
# write_off_amount is only for POS Invoice
# total_advance is only for non POS Invoice
if self.doc.doctype == "Sales Invoice":
self.doc.round_floats_in(self.doc, ["base_grand_total", "total_advance", "write_off_amount", "paid_amount"])
total_amount_to_pay = self.doc.base_grand_total - self.doc.write_off_amount
self.doc.outstanding_amount = flt(total_amount_to_pay - self.doc.total_advance - self.doc.paid_amount,
self.doc.precision("outstanding_amount"))
else:
self.doc.round_floats_in(self.doc, ["total_advance", "write_off_amount"])
self.doc.total_amount_to_pay = flt(self.doc.base_grand_total - self.doc.write_off_amount,
self.doc.precision("total_amount_to_pay"))
self.doc.outstanding_amount = flt(self.doc.total_amount_to_pay - self.doc.total_advance,
self.doc.precision("outstanding_amount"))