# 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 _, scrub from frappe.utils import cint, flt, round_based_on_smallest_currency_fraction from erpnext.setup.utils import get_company_currency from erpnext.controllers.accounts_controller import validate_conversion_rate, \ validate_taxes_and_charges, validate_inclusive_tax class calculate_taxes_and_totals(object): def __init__(self, doc): self.doc = doc self.calculate() def calculate(self): self.discount_amount_applied = False self._calculate() if self.doc.meta.get_field("discount_amount"): self.set_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.manipulate_grand_total_for_inclusive_tax() 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"): 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"] 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"]) 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 if getattr(tax, "add_deduct_tax", None): current_tax_fraction *= -1.0 if (tax.add_deduct_tax == "Deduct") else 1.0 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] # accumulate tax amount into tax.tax_amount 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 # 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 # 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: tax.grand_total_for_current_item = flt(item.net_amount + current_tax_amount, tax.precision("total")) else: tax.grand_total_for_current_item = \ 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 if i == (len(self.doc.get("taxes")) - 1) and self.discount_amount_applied \ and self.doc.discount_amount and self.doc.apply_discount_on == "Grand Total": 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 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")) 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, tax.precision("tax_amount")) tax.total = flt(tax.total + discount_amount_loss, tax.precision("total")) self._set_in_company_currency(tax, ["total", "tax_amount_after_discount_amount"]) def manipulate_grand_total_for_inclusive_tax(self): # if fully inclusive taxes and diff if self.doc.get("taxes") and all(cint(t.included_in_print_rate) for t in self.doc.get("taxes")): last_tax = self.doc.get("taxes")[-1] diff = self.doc.total - flt(last_tax.total, self.doc.precision("grand_total")) if diff and abs(diff) <= (2.0 / 10**last_tax.precision("tax_amount")): last_tax.tax_amount += diff last_tax.tax_amount_after_discount_amount += diff last_tax.total += diff self._set_in_company_currency(last_tax, ["total", "tax_amount", "tax_amount_after_discount_amount"]) 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) 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"]) 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.doc.taxes_and_charges_deducted = 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_after_discount_amount) else: self.doc.taxes_and_charges_deducted += flt(tax.tax_amount_after_discount_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.round_floats_in(self.doc, ["grand_total", "base_grand_total"]) if self.doc.meta.get_field("rounded_total"): self.doc.rounded_total = round_based_on_smallest_currency_fraction(self.doc.grand_total, self.doc.currency, self.doc.precision("rounded_total")) if self.doc.meta.get_field("base_rounded_total"): company_currency = get_company_currency(self.doc.company) self.doc.base_rounded_total = \ round_based_on_smallest_currency_fraction(self.doc.base_grand_total, company_currency, self.doc.precision("base_rounded_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 set_discount_amount(self): if not self.doc.discount_amount and self.doc.additional_discount_percentage: self.doc.discount_amount = flt(flt(self.doc.get(scrub(self.doc.apply_discount_on))) * self.doc.additional_discount_percentage / 100, self.doc.precision("discount_amount")) 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")) if item.qty else 0 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): 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")) 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")) if self.doc.party_account_currency == self.doc.currency: invoice_total = self.doc.grand_total else: invoice_total = flt(self.doc.grand_total * self.doc.conversion_rate, self.doc.precision("grand_total")) if invoice_total > 0 and self.doc.total_advance > invoice_total: frappe.throw(_("Advance amount cannot be greater than {0} {1}") .format(self.doc.party_account_currency, invoice_total)) 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.is_return: return self.doc.round_floats_in(self.doc, ["grand_total", "total_advance", "write_off_amount"]) self._set_in_company_currency(self.doc, ['write_off_amount']) if self.doc.party_account_currency == self.doc.currency: total_amount_to_pay = flt(self.doc.grand_total - self.doc.total_advance - flt(self.doc.write_off_amount), self.doc.precision("grand_total")) else: total_amount_to_pay = flt(flt(self.doc.grand_total * self.doc.conversion_rate, self.doc.precision("grand_total")) - self.doc.total_advance - flt(self.doc.base_write_off_amount), self.doc.precision("grand_total")) if self.doc.doctype == "Sales Invoice": self.doc.round_floats_in(self.doc, ["paid_amount"]) paid_amount = self.doc.paid_amount \ if self.doc.party_account_currency == self.doc.currency else self.doc.base_paid_amount self.doc.outstanding_amount = flt(total_amount_to_pay - flt(paid_amount), self.doc.precision("outstanding_amount")) elif self.doc.doctype == "Purchase Invoice": self.doc.outstanding_amount = flt(total_amount_to_pay, self.doc.precision("outstanding_amount"))