434 lines
16 KiB
Python
434 lines
16 KiB
Python
# ERPNext - web based ERP (http://erpnext.com)
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# Copyright (C) 2012 Web Notes Technologies Pvt Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from __future__ import unicode_literals
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import webnotes
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import webnotes.model
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from webnotes import _, msgprint
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from webnotes.utils import cint, flt
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from webnotes.model.utils import round_doc
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import json
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from controllers.transaction_controller import TransactionController
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class TaxController(TransactionController):
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def append_taxes(self):
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"""append taxes as per tax master link field"""
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# clear tax table
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self.doclist = self.doclist.get({"parentfield": ["!=",
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self.fmap.taxes_and_charges]})
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tax_master_doctype = self.meta.get_options(self.fmap.taxes_and_charges_master)
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master_tax_list = webnotes.get_doclist(tax_master_doctype,
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self.doc.fields.get(self.fmap.taxes_and_charges_master)).get(
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{"parentfield": self.fmap.taxes_and_charges})
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for base_tax in master_tax_list:
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tax = DictObj([[field, base_tax.fields.get(field)]
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for field in base_tax.fields
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if field not in webnotes.model.default_fields])
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tax.update({
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"doctype": self.meta.get_options(self.fmap.taxes_and_charges),
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"parentfield": self.fmap.taxes_and_charges,
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"rate": flt(tax.rate, self.precision.tax.rate),
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})
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self.doclist.append(tax)
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def calculate_taxes_and_totals(self):
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"""
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Calculates:
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* amount for each item
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* valuation_tax_amount for each item,
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* tax amount and tax total for each tax
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* net total
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* total taxes
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* grand total
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"""
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self.doc.fields[self.fmap.exchange_rate] = \
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flt(self.doc.fields.get(self.fmap.exchange_rate),
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self.precision.main[self.fmap.exchange_rate])
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self.calculate_item_values()
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self.initialize_taxes()
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if self.meta.get_field("included_in_print_rate",
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parentfield=self.fmap.taxes_and_charges):
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self.determine_exclusive_rate()
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self.calculate_net_total()
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self.calculate_taxes()
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self.calculate_totals()
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self.set_amount_in_words()
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def calculate_item_values(self):
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def _set_base(item, print_field, base_field):
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"""set values in base currency"""
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item.fields[base_field] = flt((flt(item.fields[print_field],
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self.precision.item[print_field]) * \
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self.doc.fields.get(self.fmap.exchange_rate)),
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self.precision.item[base_field])
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for item in self.item_doclist:
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round_doc(item, self.precision.item)
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if item.fields.get(self.fmap.discount) == 100:
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if not item.fields.get(self.fmap.print_ref_rate):
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item.fields[self.fmap.print_ref_rate] = \
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item.fields.get(self.fmap.print_rate)
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item.fields[self.fmap.print_rate] = 0
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else:
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if item.fields.get(self.fmap.print_ref_rate):
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item.fields[self.fmap.print_rate] = \
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flt(item.fields.get(self.fmap.print_ref_rate) *
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(1.0 - (item.fields.get(self.fmap.discount) / 100.0)),
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self.precision.item[self.fmap.print_rate])
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else:
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# assume that print rate and discount are specified
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item.fields[self.fmap.print_ref_rate] = \
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flt(item.fields.get(self.fmap.print_rate) /
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(1.0 - (item.fields.get(self.fmap.discount) / 100.0)),
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self.precision.item[self.fmap.print_ref_rate])
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item.fields[self.fmap.print_amount] = \
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flt(item.fields.get(self.fmap.print_rate) * \
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item.fields.get(self.fmap.qty),
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self.precision.item[self.fmap.print_amount])
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_set_base(item, self.fmap.print_ref_rate, self.fmap.ref_rate)
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_set_base(item, self.fmap.print_rate, self.fmap.rate)
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_set_base(item, self.fmap.print_amount, self.fmap.amount)
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def initialize_taxes(self):
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for tax in self.tax_doclist:
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# initialize totals to 0
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tax.tax_amount = tax.total = tax.total_print = 0
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tax.grand_total_for_current_item = tax.tax_amount_for_current_item = 0
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# for actual type, user can mention actual tax amount in tax.tax_amount_print
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if tax.charge_type != "Actual" or tax.rate:
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tax.tax_amount_print = 0
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self.validate_on_previous_row(tax)
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self.validate_included_tax(tax)
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# round relevant values
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round_doc(tax, self.precision.tax)
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def calculate_net_total(self):
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self.doc.net_total = 0
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self.doc.fields[self.fmap.net_total_print] = 0
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for item in self.item_doclist:
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self.doc.net_total += item.amount
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self.doc.fields[self.fmap.net_total_print] += \
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item.fields.get(self.fmap.print_amount)
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self.doc.net_total = flt(self.doc.net_total, self.precision.main.net_total)
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self.doc.fields[self.fmap.net_total_print] = \
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flt(self.doc.fields.get(self.fmap.net_total_print),
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self.precision.main[self.fmap.net_total_print])
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def calculate_taxes(self):
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for item in self.item_doclist:
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item_tax_map = self._load_item_tax_rate(item.item_tax_rate)
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item.fields[self.fmap.valuation_tax_amount] = 0
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for i, tax in enumerate(self.tax_doclist):
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# tax_amount represents the amount of tax for the current step
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current_tax_amount = self.get_current_tax_amount(item, tax, item_tax_map)
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if hasattr(self, "set_valuation_tax_amount"):
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self.set_valuation_tax_amount(item, tax, current_tax_amount)
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# case when net total is 0 but there is an actual type charge
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# in this case add the actual amount to tax.tax_amount
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# and tax.grand_total_for_current_item for the first such iteration
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if not (current_tax_amount or self.doc.net_total or tax.tax_amount) and \
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tax.charge_type=="Actual":
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zero_net_total_adjustment = flt((tax.tax_amount_print *
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self.doc.fields.get(self.fmap.exchange_rate)) or tax.rate,
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self.precision.tax.tax_amount)
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current_tax_amount += zero_net_total_adjustment
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# store tax_amount for current item as it will be used for
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# charge type = 'On Previous Row Amount'
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tax.tax_amount_for_current_item = current_tax_amount
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# accumulate tax amount into tax.tax_amount
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tax.tax_amount += tax.tax_amount_for_current_item
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# accumulate tax_amount_print only if tax is not included
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# and if tax amount of actual type is entered in 'rate' field
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if not cint(tax.included_in_print_rate) and (tax.charge_type != "Actual"
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or tax.rate):
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tax.tax_amount_print += flt((tax.tax_amount_for_current_item /
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self.doc.fields.get(self.fmap.exchange_rate)),
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self.precision.tax.tax_amount_print)
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if tax.category == "Valuation":
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# if just for valuation, do not add the tax amount in total
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# hence, setting it as 0 for further steps
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current_tax_amount = 0
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# Calculate tax.total viz. grand total till that step
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# note: grand_total_for_current_item contains the contribution of
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# item's amount, previously applied tax and the current tax on that item
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if i==0:
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tax.grand_total_for_current_item = flt(item.amount +
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current_tax_amount, self.precision.tax.total)
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# if inclusive pricing, current_tax_amount should not be considered
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if cint(tax.included_in_print_rate):
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current_tax_amount = 0
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tax.grand_total_print_for_current_item = \
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flt(item.fields.get(self.fmap.print_amount) +
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(current_tax_amount / self.doc.fields.get(
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self.fmap.exchange_rate)),
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self.precision.tax.total_print)
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else:
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tax.grand_total_for_current_item = \
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flt(self.tax_doclist[i-1].grand_total_for_current_item +
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current_tax_amount, self.precision.tax.total)
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# if inclusive pricing, current_tax_amount should not be considered
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if cint(tax.included_in_print_rate):
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current_tax_amount = 0
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tax.grand_total_print_for_current_item = \
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flt(self.tax_doclist[i-1].grand_total_print_for_current_item +
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(current_tax_amount / self.doc.fields.get(
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self.fmap.exchange_rate)),
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self.precision.tax.total_print)
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# in tax.total, accumulate grand total of each item
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tax.total += tax.grand_total_for_current_item
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tax.total_print += tax.grand_total_print_for_current_item
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# TODO store tax_breakup for each item
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def get_current_tax_amount(self, item, tax, item_tax_map):
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tax_rate = self._get_tax_rate(tax, item_tax_map)
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if tax.charge_type == "Actual":
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# distribute the tax amount proportionally to each item row
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actual = flt(tax.rate or (tax.tax_amount_print * \
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self.doc.fields.get(self.fmap.exchange_rate)),
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self.precision.tax.tax_amount)
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current_tax_amount = (self.doc.net_total
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and ((item.amount / self.doc.net_total) * actual)
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or 0)
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elif tax.charge_type == "On Net Total":
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current_tax_amount = (tax_rate / 100.0) * item.amount
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elif tax.charge_type == "On Previous Row Amount":
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current_tax_amount = (tax_rate / 100.0) * \
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self.tax_doclist[cint(tax.row_id) - 1].tax_amount_for_current_item
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elif tax.charge_type == "On Previous Row Total":
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current_tax_amount = (tax_rate / 100.0) * \
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self.tax_doclist[cint(tax.row_id) - 1].grand_total_for_current_item
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return flt(current_tax_amount, self.precision.tax.tax_amount)
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def calculate_totals(self):
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if self.tax_doclist:
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self.doc.grand_total = flt(self.tax_doclist[-1].total,
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self.precision.main.grand_total)
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self.doc.fields[self.fmap.grand_total_print] = \
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flt(self.tax_doclist[-1].total_print,
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self.precision.main[self.fmap.grand_total_print])
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else:
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self.doc.grand_total = flt(self.doc.net_total,
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self.precision.main.grand_total)
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self.doc.fields[self.fmap.grand_total_print] = \
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flt(self.doc.fields.get(self.fmap.net_total_print),
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self.precision.main[self.fmap.grand_total_print])
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self.doc.fields[self.fmap.taxes_and_charges_total] = \
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flt(self.doc.grand_total - self.doc.net_total,
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self.precision.main[self.fmap.taxes_and_charges_total])
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self.doc.taxes_and_charges_total_print = \
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flt(self.doc.fields.get(self.fmap.grand_total_print) - \
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self.doc.fields.get(self.fmap.net_total_print),
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self.precision.main.taxes_and_charges_total_print)
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self.doc.rounded_total = round(self.doc.grand_total)
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self.doc.fields[self.fmap.rounded_total_print] = \
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round(self.doc.fields.get(self.fmap.grand_total_print))
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def set_amount_in_words(self):
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from webnotes.utils import money_in_words
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base_currency = webnotes.conn.get_value("Company", self.doc.currency,
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"default_currency")
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self.doc.fields[self.fmap.grand_total_in_words] = \
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money_in_words(self.doc.grand_total, base_currency)
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self.doc.fields[self.fmap.rounded_total_in_words] = \
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money_in_words(self.doc.rounded_total, base_currency)
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self.doc.fields[self.fmap.grand_total_in_words_print] = \
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money_in_words(self.doc.fields.get(self.fmap.grand_total_print),
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self.doc.currency)
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self.doc.fields[self.fmap.rounded_total_in_words_print] = \
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money_in_words(self.doc.fields.get(self.fmap.rounded_total_print),
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self.doc.currency)
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def validate_on_previous_row(self, tax):
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"""
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validate if a valid row id is mentioned in case of
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On Previous Row Amount and On Previous Row Total
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"""
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if tax.charge_type in ["On Previous Row Amount", "On Previous Row Total"] and \
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(not tax.row_id or cint(tax.row_id) >= tax.idx):
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msgprint((_("Row") + " # %(idx)s [%(taxes_doctype)s]: " + \
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_("Please specify a valid") + " %(row_id_label)s") % {
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"idx": tax.idx,
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"taxes_doctype": tax.parenttype,
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"row_id_label": self.meta.get_label("row_id",
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parentfield=self.fmap.taxes_and_charges)
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}, raise_exception=True)
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def validate_included_tax(self, tax):
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"""
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validate conditions related to "Is this Tax Included in Rate?"
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"""
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def _on_previous_row_error(tax, row_range):
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msgprint((_("Row") + " # %(idx)s [%(taxes_doctype)s]: " + \
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_("If") + " '%(inclusive_label)s' " + _("is checked for") + \
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" '%(charge_type_label)s' = '%(charge_type)s', " + _("then") + " " + \
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_("Row") + " # %(row_range)s " + _("should also have") + \
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" '%(inclusive_label)s' = " + _("checked")) % {
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"idx": tax.idx,
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"taxes_doctype": tax.doctype,
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"inclusive_label": self.meta.get_label("included_in_print_rate",
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parentfield=self.fmap.taxes_and_charges),
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"charge_type_label": self.meta.get_label("charge_type",
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parentfield=self.fmap.taxes_and_charges),
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"charge_type": tax.charge_type,
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"row_range": row_range,
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}, raise_exception=True)
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if cint(tax.included_in_print_rate):
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if tax.charge_type == "Actual":
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# now inclusive rate for type 'Actual'
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msgprint((_("Row") + " # %(idx)s [%(taxes_doctype)s]: " + \
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"'%(charge_type_label)s' = '%(charge_type)s' " + \
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_("cannot be included in item's rate")) % {
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"idx": tax.idx,
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"taxes_doctype": self.meta.get_options(
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self.fmap.taxes_and_charges),
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"charge_type_label": self.meta.get_label("charge_type",
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parentfield=self.fmap.taxes_and_charges),
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"charge_type": tax.charge_type,
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}, raise_exception=True)
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elif tax.charge_type == "On Previous Row Amount" and \
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not cint(self.tax_doclist[cint(tax.row_id) - 1]\
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.included_in_print_rate):
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# for an inclusive tax of type "On Previous Row Amount",
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# dependent row should also be inclusive
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_on_previous_row_error(tax, tax.row_id)
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elif tax.charge_type == "On Previous Row Total" and \
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not all([cint(t.included_in_print_rate) \
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for t in self.tax_doclist[:tax.idx - 1]]):
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# for an inclusive tax of type "On Previous Row Total",
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# all rows above it should also be inclusive
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_on_previous_row_error(tax, "1 - %d" % (tax.idx - 1))
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def determine_exclusive_rate(self):
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if not any((cint(tax.included_in_print_rate) for tax in self.tax_doclist)):
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# if no tax is marked as included in print rate, no need to proceed further
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return
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for item in self.item_doclist:
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item_tax_map = self._load_item_tax_rate(item.item_tax_rate)
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cumulated_tax_fraction = 0
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for i, tax in enumerate(self.tax_doclist):
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if cint(tax.included_in_print_rate):
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tax.tax_fraction_for_current_item = \
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self.get_current_tax_fraction(tax, item_tax_map)
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else:
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tax.tax_fraction_for_current_item = 0
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if i==0:
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tax.grand_total_fraction_for_current_item = 1 + \
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tax.tax_fraction_for_current_item
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else:
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tax.grand_total_fraction_for_current_item = \
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self.tax_doclist[i-1].grand_total_fraction_for_current_item \
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+ tax.tax_fraction_for_current_item
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cumulated_tax_fraction += tax.tax_fraction_for_current_item
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if cumulated_tax_fraction:
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item.fields[self.fmap.rate] = \
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flt((item.fields.get(self.fmap.print_rate) * \
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self.doc.fields.get(self.fmap.exchange_rate)) /
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(1 + cumulated_tax_fraction), self.precision.item[self.fmap.rate])
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item.amount = flt(item.fields.get(self.fmap.rate) * item.qty,
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self.precision.item.amount)
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item.fields[self.fmap.ref_rate] = \
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flt(item.fields.get(self.fmap.rate) / (1 - \
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(item.fields.get(self.fmap.discount) / 100.0)),
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self.precision.item[self.fmap.ref_rate])
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# print item.print_rate, 1+cumulated_tax_fraction, item.rate, item.amount
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# print "-"*10
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def get_current_tax_fraction(self, tax, item_tax_map):
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"""
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Get tax fraction for calculating tax exclusive amount
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from tax inclusive amount
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"""
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current_tax_fraction = 0
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if cint(tax.included_in_print_rate):
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tax_rate = self._get_tax_rate(tax, item_tax_map)
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if tax.charge_type == "On Net Total":
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current_tax_fraction = tax_rate / 100.0
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elif tax.charge_type == "On Previous Row Amount":
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current_tax_fraction = (tax_rate / 100.0) * \
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self.tax_doclist[cint(tax.row_id) - 1]\
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.tax_fraction_for_current_item
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elif tax.charge_type == "On Previous Row Total":
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current_tax_fraction = (tax_rate / 100.0) * \
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self.tax_doclist[cint(tax.row_id) - 1]\
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.grand_total_fraction_for_current_item
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# print tax.account_head, tax_rate, current_tax_fraction
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return current_tax_fraction
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def _load_item_tax_rate(self, item_tax_rate):
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if not item_tax_rate:
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return {}
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return json.loads(item_tax_rate)
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def _get_tax_rate(self, tax, item_tax_map):
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if item_tax_map.has_key(tax.account_head):
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return flt(item_tax_map.get(tax.account_head), self.precision.tax.rate)
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else:
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return tax.rate
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