324 lines
12 KiB
Python
324 lines
12 KiB
Python
#This file is part of Tryton. The COPYRIGHT file at the top level of
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#this repository contains the full copyright notices and license terms.
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from decimal import Decimal
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from dateutil.relativedelta import relativedelta
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from trytond.model import ModelView, ModelSQL, fields
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from trytond import backend
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from trytond.pyson import Eval
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from trytond.transaction import Transaction
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from trytond.pool import Pool
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__all__ = ['PaymentTerm', 'PaymentTermLine']
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class PaymentTerm(ModelSQL, ModelView):
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'Payment Term'
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__name__ = 'account.invoice.payment_term'
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name = fields.Char('Payment Term', size=None, required=True,
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translate=True)
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active = fields.Boolean('Active')
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description = fields.Text('Description', translate=True)
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lines = fields.One2Many('account.invoice.payment_term.line', 'payment',
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'Lines')
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@classmethod
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def __setup__(cls):
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super(PaymentTerm, cls).__setup__()
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cls._order.insert(0, ('name', 'ASC'))
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cls._error_messages.update({
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'invalid_line': ('Invalid line "%(line)s" in payment term '
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'"%(term)s".'),
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'missing_remainder': ('Missing remainder line in payment term '
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'"%s".'),
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'last_remainder': ('Last line of payment term "%s" must be of '
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'type remainder.'),
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})
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@classmethod
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def validate(cls, terms):
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super(PaymentTerm, cls).validate(terms)
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for term in terms:
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term.check_remainder()
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def check_remainder(self):
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if not self.lines or not self.lines[-1].type == 'remainder':
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self.raise_user_error('last_remainder', self.rec_name)
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@staticmethod
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def default_active():
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return True
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def compute(self, amount, currency, date=None):
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"""Calculate payment terms and return a list of tuples
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with (date, amount) for each payment term line.
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amount must be a Decimal used for the calculation.
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If specified, date will be used as the start date, otherwise current
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date will be used.
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"""
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#TODO implement business_days
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# http://pypi.python.org/pypi/BusinessHours/
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Date = Pool().get('ir.date')
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sign = 1 if amount >= Decimal('0.0') else -1
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res = []
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if date is None:
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date = Date.today()
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remainder = amount
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for line in self.lines:
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value = line.get_value(remainder, amount, currency)
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value_date = line.get_date(date)
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if not value or not value_date:
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if (not remainder) and line.amount:
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self.raise_user_error('invalid_line', {
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'line': line.rec_name,
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'term': self.rec_name,
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})
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else:
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continue
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if ((remainder - value) * sign) < Decimal('0.0'):
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res.append((value_date, remainder))
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break
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res.append((value_date, value))
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remainder -= value
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if not currency.is_zero(remainder):
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self.raise_user_error('missing_remainder', (self.rec_name,))
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return res
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class PaymentTermLine(ModelSQL, ModelView):
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'Payment Term Line'
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__name__ = 'account.invoice.payment_term.line'
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sequence = fields.Integer('Sequence',
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help='Use to order lines in ascending order')
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payment = fields.Many2One('account.invoice.payment_term', 'Payment Term',
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required=True, ondelete="CASCADE")
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type = fields.Selection([
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('fixed', 'Fixed'),
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('percent', 'Percentage on Remainder'),
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('percent_on_total', 'Percentage on Total'),
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('remainder', 'Remainder'),
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], 'Type', required=True,
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on_change=['type'])
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percentage = fields.Numeric('Percentage', digits=(16, 8),
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states={
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'invisible': ~Eval('type').in_(['percent', 'percent_on_total']),
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'required': Eval('type').in_(['percent', 'percent_on_total']),
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}, on_change=['percentage'], depends=['type'])
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divisor = fields.Numeric('Divisor', digits=(16, 8),
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states={
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'invisible': ~Eval('type').in_(['percent', 'percent_on_total']),
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'required': Eval('type').in_(['percent', 'percent_on_total']),
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}, on_change=['divisor'], depends=['type'])
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amount = fields.Numeric('Amount', digits=(16, Eval('currency_digits', 2)),
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states={
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'invisible': Eval('type') != 'fixed',
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'required': Eval('type') == 'fixed',
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}, depends=['type', 'currency_digits'])
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currency = fields.Many2One('currency.currency', 'Currency',
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states={
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'invisible': Eval('type') != 'fixed',
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'required': Eval('type') == 'fixed',
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}, depends=['type'])
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currency_digits = fields.Function(fields.Integer('Currency Digits',
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on_change_with=['currency']), 'on_change_with_currency_digits')
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day = fields.Integer('Day of Month')
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month = fields.Selection([
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(None, ''),
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('1', 'January'),
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('2', 'February'),
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('3', 'March'),
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('4', 'April'),
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('5', 'May'),
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('6', 'June'),
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('7', 'July'),
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('8', 'August'),
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('9', 'September'),
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('10', 'October'),
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('11', 'November'),
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('12', 'December'),
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], 'Month', sort=False)
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weekday = fields.Selection([
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(None, ''),
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('0', 'Monday'),
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('1', 'Tuesday'),
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('2', 'Wednesday'),
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('3', 'Thursday'),
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('4', 'Friday'),
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('5', 'Saturday'),
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('6', 'Sunday'),
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], 'Day of Week', sort=False)
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months = fields.Integer('Number of Months', required=True)
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weeks = fields.Integer('Number of Weeks', required=True)
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days = fields.Integer('Number of Days', required=True)
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@classmethod
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def __setup__(cls):
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super(PaymentTermLine, cls).__setup__()
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cls._order.insert(0, ('sequence', 'ASC'))
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cls._sql_constraints += [
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('day', 'CHECK(day BETWEEN 1 AND 31)',
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'Day of month must be between 1 and 31.'),
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]
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cls._error_messages.update({
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'invalid_percentage_and_divisor': ('Percentage and '
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'Divisor values are not consistent in line "%(line)s" '
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'of payment term "%(term)s".'),
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})
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@classmethod
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def __register__(cls, module_name):
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TableHandler = backend.get('TableHandler')
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sql_table = cls.__table__()
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super(PaymentTermLine, cls).__register__(module_name)
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cursor = Transaction().cursor
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table = TableHandler(cursor, cls, module_name)
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# Migration from 1.0 percent change into percentage
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if table.column_exist('percent'):
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cursor.execute(*sql_table.update(
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columns=[sql_table.percentage],
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values=[sql_table.percent * 100]))
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table.drop_column('percent', exception=True)
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# Migration from 2.2
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if table.column_exist('delay'):
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cursor.execute(*sql_table.update(
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columns=[sql_table.day],
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values=[31],
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where=sql_table.delay == 'end_month'))
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table.drop_column('delay', exception=True)
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lines = cls.search([])
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for line in lines:
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if line.percentage:
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cls.write([line], {
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'divisor': cls.round(Decimal('100.0') /
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line.percentage, cls.divisor.digits[1]),
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})
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# Migration from 2.4: drop required on sequence
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table.not_null_action('sequence', action='remove')
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@staticmethod
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def order_sequence(tables):
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table, _ = tables[None]
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return [table.sequence == None, table.sequence]
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@staticmethod
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def default_currency_digits():
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return 2
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@staticmethod
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def default_type():
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return 'remainder'
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@staticmethod
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def default_months():
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return 0
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@staticmethod
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def default_weeks():
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return 0
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@staticmethod
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def default_days():
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return 0
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def on_change_type(self):
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res = {}
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if self.type != 'fixed':
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res['amount'] = Decimal('0.0')
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res['currency'] = None
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if self.type not in ('percent', 'percent_on_total'):
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res['percentage'] = Decimal('0.0')
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res['divisor'] = Decimal('0.0')
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return res
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def on_change_percentage(self):
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if not self.percentage:
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return {'divisor': 0.0}
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return {
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'divisor': self.round(Decimal('100.0') / self.percentage,
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self.__class__.divisor.digits[1]),
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}
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def on_change_divisor(self):
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if not self.divisor:
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return {'percentage': 0.0}
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return {
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'percentage': self.round(Decimal('100.0') / self.divisor,
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self.__class__.percentage.digits[1]),
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}
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def on_change_with_currency_digits(self, name=None):
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if self.currency:
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return self.currency.digits
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return 2
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def get_delta(self):
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return {
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'day': self.day,
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'month': int(self.month) if self.month else None,
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'days': self.days,
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'weeks': self.weeks,
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'months': self.months,
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'weekday': int(self.weekday) if self.weekday else None,
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}
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def get_date(self, date):
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return date + relativedelta(**self.get_delta())
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def get_value(self, remainder, amount, currency):
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Currency = Pool().get('currency.currency')
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if self.type == 'fixed':
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return Currency.compute(self.currency, self.amount, currency)
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elif self.type == 'percent':
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return currency.round(
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remainder * self.percentage / Decimal('100'))
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elif self.type == 'percent_on_total':
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return currency.round(
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amount * self.percentage / Decimal('100'))
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elif self.type == 'remainder':
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return currency.round(remainder)
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return None
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@staticmethod
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def round(number, digits):
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quantize = Decimal(10) ** -Decimal(digits)
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return Decimal(number).quantize(quantize)
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@classmethod
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def validate(cls, lines):
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super(PaymentTermLine, cls).validate(lines)
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cls.check_percentage_and_divisor(lines)
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@classmethod
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def check_percentage_and_divisor(cls, lines):
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"Check consistency between percentage and divisor"
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percentage_digits = cls.percentage.digits[1]
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divisor_digits = cls.divisor.digits[1]
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for line in lines:
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if line.type not in ('percent', 'percent_on_total'):
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continue
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if line.percentage is None or line.divisor is None:
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cls.raise_user_error('invalid_percentage_and_divisor', {
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'line': line.rec_name,
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'term': line.payment.rec_name,
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})
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if line.percentage == line.divisor == Decimal('0.0'):
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continue
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percentage = line.percentage
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divisor = line.divisor
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calc_percentage = cls.round(Decimal('100.0') / divisor,
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percentage_digits)
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calc_divisor = cls.round(Decimal('100.0') / percentage,
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divisor_digits)
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if (percentage == Decimal('0.0') or divisor == Decimal('0.0')
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or percentage != calc_percentage
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and divisor != calc_divisor):
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cls.raise_user_error('invalid_percentage_and_divisor', {
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'line': line.rec_name,
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'term': line.payment.rec_name,
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})
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