Merge PR #434 into 12.0

Signed-off-by pedrobaeza

contract/__manifest__.py

@@ -4,7 +4,7 @@
 # Copyright 2016-2018 Tecnativa - Carlos Dauden
 # Copyright 2017 Tecnativa - Vicent Cubells
 # Copyright 2016-2017 LasLabs Inc.
-# Copyright 2018 ACSONE SA/NV
+# Copyright 2018-2019 ACSONE SA/NV
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
 {

contract/migrations/12.0.5.0.0/pre-migration.py

@@ -0,0 +1,10 @@
+def migrate(cr, version):
+    # pre-paid/post-paid becomes significant for monthlylastday too,
+    # make sure it has the value that was implied for previous versions.
+    cr.execute(
+        """\
+            UPDATE contract_line
+            SET recurring_invoicing_type = 'post-paid'
+            WHERE recurring_rule_type = 'monthlylastday'
+        """
+    )

contract/models/abstract_contract_line.py

@@ -70,9 +70,20 @@ class ContractAbstractContractLine(models.AbstractModel):
         [('pre-paid', 'Pre-paid'), ('post-paid', 'Post-paid')],
         default='pre-paid',
         string='Invoicing type',
-        help="Specify if process date is 'from' or 'to' invoicing date",
+        help=(
+            "Specify if the invoice must be generated at the beginning "
+            "(pre-paid) or end (post-paid) of the period."
+        ),
         required=True,
     )
+    recurring_invoicing_offset = fields.Integer(
+        compute="_compute_recurring_invoicing_offset",
+        string="Invoicing offset",
+        help=(
+            "Number of days to offset the invoice from the period end "
+            "date (in post-paid mode) or start date (in pre-paid mode)."
+        )
+    )
     recurring_interval = fields.Integer(
         default=1,
         string='Invoice Every',
@@ -115,6 +126,27 @@ class ContractAbstractContractLine(models.AbstractModel):
         ondelete='cascade',
     )
 
+    @api.model
+    def _get_default_recurring_invoicing_offset(
+        self, recurring_invoicing_type, recurring_rule_type
+    ):
+        if (
+            recurring_invoicing_type == 'pre-paid'
+            or recurring_rule_type == 'monthlylastday'
+        ):
+            return 0
+        else:
+            return 1
+
+    @api.depends('recurring_invoicing_type', 'recurring_rule_type')
+    def _compute_recurring_invoicing_offset(self):
+        for rec in self:
+            rec.recurring_invoicing_offset = (
+                self._get_default_recurring_invoicing_offset(
+                    rec.recurring_invoicing_type, rec.recurring_rule_type
+                )
+            )
+
     @api.depends(
         'automatic_price',
         'specific_price',

contract/models/contract_line.py

@@ -41,6 +41,14 @@ class ContractLine(models.Model):
     last_date_invoiced = fields.Date(
         string='Last Date Invoiced', readonly=True, copy=False
     )
+    next_period_date_start = fields.Date(
+        string='Next Period Start',
+        compute='_compute_next_period_date_start',
+    )
+    next_period_date_end = fields.Date(
+        string='Next Period End',
+        compute='_compute_next_period_date_end',
+    )
     termination_notice_date = fields.Date(
         string='Termination notice date',
         compute="_compute_termination_notice_date",
@@ -361,20 +369,140 @@ class ContractLine(models.Model):
         date_start,
         recurring_invoicing_type,
         recurring_rule_type,
-        recurring_interval,
+        recurring_interval
     ):
-        if recurring_rule_type == 'monthlylastday':
+        # deprecated method for backward compatibility
-            return date_start + self.get_relative_delta(
+        return self.get_next_invoice_date(
-                recurring_rule_type, recurring_interval - 1
+            date_start,
-            )
+            recurring_invoicing_type,
-        if recurring_invoicing_type == 'pre-paid':
+            self._get_default_recurring_invoicing_offset(
-            return date_start
+                recurring_invoicing_type, recurring_rule_type
-        return date_start + self.get_relative_delta(
+            ),
-            recurring_rule_type, recurring_interval
+            recurring_rule_type,
+            recurring_interval,
+            max_date_end=False,
         )
 
     @api.model
-    def compute_first_date_end(
+    def get_next_invoice_date(
+        self,
+        next_period_date_start,
+        recurring_invoicing_type,
+        recurring_invoicing_offset,
+        recurring_rule_type,
+        recurring_interval,
+        max_date_end,
+    ):
+        next_period_date_end = self.get_next_period_date_end(
+            next_period_date_start,
+            recurring_rule_type,
+            recurring_interval,
+            max_date_end=max_date_end,
+        )
+        if not next_period_date_end:
+            return False
+        if recurring_invoicing_type == 'pre-paid':
+            recurring_next_date = (
+                next_period_date_start
+                + relativedelta(days=recurring_invoicing_offset)
+            )
+        else:  # post-paid
+            recurring_next_date = (
+                next_period_date_end
+                + relativedelta(days=recurring_invoicing_offset)
+            )
+        return recurring_next_date
+
+    @api.model
+    def get_next_period_date_end(
+        self,
+        next_period_date_start,
+        recurring_rule_type,
+        recurring_interval,
+        max_date_end,
+        next_invoice_date=False,
+        recurring_invoicing_type=False,
+        recurring_invoicing_offset=False,
+    ):
+        """Compute the end date for the next period.
+
+        The next period normally depends on recurrence options only.
+        It is however possible to provide it a next invoice date, in
+        which case this method can adjust the next period based on that
+        too. In that scenario it required the invoicing type and offset
+        arguments.
+        """
+        if not next_period_date_start:
+            return False
+        if max_date_end and next_period_date_start > max_date_end:
+            # start is past max date end: there is no next period
+            return False
+        if not next_invoice_date:
+            # regular algorithm
+            next_period_date_end = (
+                next_period_date_start
+                + self.get_relative_delta(
+                    recurring_rule_type, recurring_interval
+                )
+                - relativedelta(days=1)
+            )
+        else:
+            # special algorithm when the next invoice date is forced
+            if recurring_invoicing_type == 'pre-paid':
+                next_period_date_end = (
+                    next_invoice_date
+                    - relativedelta(days=recurring_invoicing_offset)
+                    + self.get_relative_delta(
+                        recurring_rule_type, recurring_interval
+                    )
+                    - relativedelta(days=1)
+                )
+            else:  # post-paid
+                next_period_date_end = (
+                    next_invoice_date
+                    - relativedelta(days=recurring_invoicing_offset)
+                )
+        if max_date_end and next_period_date_end > max_date_end:
+            # end date is past max_date_end: trim it
+            next_period_date_end = max_date_end
+        return next_period_date_end
+
+    @api.depends('last_date_invoiced', 'date_start', 'date_end')
+    def _compute_next_period_date_start(self):
+        for rec in self:
+            if rec.last_date_invoiced:
+                next_period_date_start = (
+                    rec.last_date_invoiced + relativedelta(days=1)
+                )
+            else:
+                next_period_date_start = rec.date_start
+            if rec.date_end and next_period_date_start > rec.date_end:
+                next_period_date_start = False
+            rec.next_period_date_start = next_period_date_start
+
+    @api.depends(
+        'next_period_date_start',
+        'recurring_invoicing_type',
+        'recurring_invoicing_offset',
+        'recurring_rule_type',
+        'recurring_interval',
+        'date_end',
+        'recurring_next_date',
+    )
+    def _compute_next_period_date_end(self):
+        for rec in self:
+            rec.next_period_date_end = self.get_next_period_date_end(
+                rec.next_period_date_start,
+                rec.recurring_rule_type,
+                rec.recurring_interval,
+                max_date_end=rec.date_end,
+                next_invoice_date=rec.recurring_next_date,
+                recurring_invoicing_type=rec.recurring_invoicing_type,
+                recurring_invoicing_offset=rec.recurring_invoicing_offset,
+            )
+
+    @api.model
+    def _get_first_date_end(
         self, date_start, auto_renew_rule_type, auto_renew_interval
     ):
         return (
@@ -396,7 +524,7 @@ class ContractLine(models.Model):
         auto_renew"""
         for rec in self.filtered('is_auto_renew'):
             if rec.date_start:
-                rec.date_end = self.compute_first_date_end(
+                rec.date_end = self._get_first_date_end(
                     rec.date_start,
                     rec.auto_renew_rule_type,
                     rec.auto_renew_interval,
@@ -404,17 +532,20 @@ class ContractLine(models.Model):
 
     @api.onchange(
         'date_start',
+        'date_end',
         'recurring_invoicing_type',
         'recurring_rule_type',
         'recurring_interval',
     )
     def _onchange_date_start(self):
         for rec in self.filtered('date_start'):
-            rec.recurring_next_date = self._compute_first_recurring_next_date(
+            rec.recurring_next_date = self.get_next_invoice_date(
                 rec.date_start,
                 rec.recurring_invoicing_type,
+                rec.recurring_invoicing_offset,
                 rec.recurring_rule_type,
                 rec.recurring_interval,
+                max_date_end=rec.date_end,
             )
 
     @api.constrains('is_canceled', 'is_auto_renew')
@@ -533,33 +664,25 @@ class ContractLine(models.Model):
     def _get_period_to_invoice(
         self, last_date_invoiced, recurring_next_date, stop_at_date_end=True
     ):
+        # TODO this method can now be removed, since
+        # TODO self.next_period_date_start/end have the same values
         self.ensure_one()
-        first_date_invoiced = False
         if not recurring_next_date:
-            return first_date_invoiced, last_date_invoiced, recurring_next_date
+            return False, False, False
         first_date_invoiced = (
             last_date_invoiced + relativedelta(days=1)
             if last_date_invoiced
             else self.date_start
         )
-        if self.recurring_rule_type == 'monthlylastday':
+        last_date_invoiced = self.get_next_period_date_end(
-            last_date_invoiced = recurring_next_date
+            first_date_invoiced,
-        else:
+            self.recurring_rule_type,
-            if self.recurring_invoicing_type == 'pre-paid':
+            self.recurring_interval,
-                last_date_invoiced = (
+            max_date_end=(self.date_end if stop_at_date_end else False),
-                    recurring_next_date
+            next_invoice_date=recurring_next_date,
-                    + self.get_relative_delta(
+            recurring_invoicing_type=self.recurring_invoicing_type,
-                        self.recurring_rule_type, self.recurring_interval
+            recurring_invoicing_offset=self.recurring_invoicing_offset,
-                    )
+        )
-                    - relativedelta(days=1)
-                )
-            else:
-                last_date_invoiced = recurring_next_date - relativedelta(
-                    days=1
-                )
-        if stop_at_date_end:
-            if self.date_end and self.date_end < last_date_invoiced:
-                last_date_invoiced = self.date_end
         return first_date_invoiced, last_date_invoiced, recurring_next_date
 
     @api.multi
@@ -580,23 +703,19 @@ class ContractLine(models.Model):
     @api.multi
     def _update_recurring_next_date(self):
         for rec in self:
-            old_date = rec.recurring_next_date
+            last_date_invoiced = rec.next_period_date_end
-            new_date = old_date + self.get_relative_delta(
+            recurring_next_date = rec.get_next_invoice_date(
-                rec.recurring_rule_type, rec.recurring_interval
+                last_date_invoiced + relativedelta(days=1),
+                rec.recurring_invoicing_type,
+                rec.recurring_invoicing_offset,
+                rec.recurring_rule_type,
+                rec.recurring_interval,
+                max_date_end=rec.date_end,
             )
-            if rec.recurring_rule_type == 'monthlylastday':
+            rec.write({
-                last_date_invoiced = old_date
+                "recurring_next_date": recurring_next_date,
-            elif rec.recurring_invoicing_type == 'post-paid':
+                "last_date_invoiced": last_date_invoiced,
-                last_date_invoiced = old_date - relativedelta(days=1)
+            })
-            elif rec.recurring_invoicing_type == 'pre-paid':
-                last_date_invoiced = new_date - relativedelta(days=1)
-
-            if rec.date_end and last_date_invoiced >= rec.date_end:
-                rec.last_date_invoiced = rec.date_end
-                rec.recurring_next_date = False
-            else:
-                rec.last_date_invoiced = last_date_invoiced
-                rec.recurring_next_date = new_date
 
     @api.multi
     def _init_last_date_invoiced(self):
@@ -609,8 +728,9 @@ class ContractLine(models.Model):
                 last_date_invoiced = (
                     rec.recurring_next_date
                     - self.get_relative_delta(
-                        rec.recurring_rule_type, rec.recurring_interval
+                        rec.recurring_rule_type, rec.recurring_interval - 1
                     )
+                    - relativedelta(days=1)
                 )
             elif rec.recurring_invoicing_type == 'post-paid':
                 last_date_invoiced = (
@@ -618,12 +738,18 @@ class ContractLine(models.Model):
                     - self.get_relative_delta(
                         rec.recurring_rule_type, rec.recurring_interval
                     )
-                ) - relativedelta(days=1)
+                    - relativedelta(days=1)
+                )
             if last_date_invoiced > rec.date_start:
                 rec.last_date_invoiced = last_date_invoiced
 
     @api.model
     def get_relative_delta(self, recurring_rule_type, interval):
+        """Return a relativedelta for one period.
+
+        When added to the first day of the period,
+        it gives the first day of the next period.
+        """
         if recurring_rule_type == 'daily':
             return relativedelta(days=interval)
         elif recurring_rule_type == 'weekly':
@@ -631,7 +757,7 @@ class ContractLine(models.Model):
         elif recurring_rule_type == 'monthly':
             return relativedelta(months=interval)
         elif recurring_rule_type == 'monthlylastday':
-            return relativedelta(months=interval, day=31)
+            return relativedelta(months=interval, day=1)
         else:
             return relativedelta(years=interval)
 
@@ -651,15 +777,23 @@ class ContractLine(models.Model):
                     )
                 )
             new_date_start = rec.date_start + delay_delta
-            rec.recurring_next_date = self._compute_first_recurring_next_date(
+            if rec.date_end:
+                new_date_end = rec.date_end + delay_delta
+            else:
+                new_date_end = False
+            new_recurring_next_date = self.get_next_invoice_date(
                 new_date_start,
                 rec.recurring_invoicing_type,
+                rec.recurring_invoicing_offset,
                 rec.recurring_rule_type,
                 rec.recurring_interval,
+                max_date_end=new_date_end
             )
-            if rec.date_end:
+            rec.write({
-                rec.date_end += delay_delta
+                "date_start": new_date_start,
-            rec.date_start = new_date_start
+                "date_end": new_date_end,
+                "recurring_next_date": new_recurring_next_date,
+            })
 
     @api.multi
     def stop(self, date_end, manual_renew_needed=False, post_message=True):
@@ -712,11 +846,13 @@ class ContractLine(models.Model):
     ):
         self.ensure_one()
         if not recurring_next_date:
-            recurring_next_date = self._compute_first_recurring_next_date(
+            recurring_next_date = self.get_next_invoice_date(
                 date_start,
                 self.recurring_invoicing_type,
+                self.recurring_invoicing_offset,
                 self.recurring_rule_type,
                 self.recurring_interval,
+                max_date_end=date_end,
             )
         new_vals = self.read()[0]
         new_vals.pop("id", None)
@@ -1023,7 +1159,7 @@ class ContractLine(models.Model):
     def _get_renewal_dates(self):
         self.ensure_one()
         date_start = self.date_end + relativedelta(days=1)
-        date_end = self.compute_first_date_end(
+        date_end = self._get_first_date_end(
             date_start, self.auto_renew_rule_type, self.auto_renew_interval
         )
         return date_start, date_end

contract/tests/test_contract.py

@@ -2,6 +2,7 @@
 # Copyright 2018 Tecnativa - Pedro M. Baeza
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
+from collections import namedtuple
 from datetime import timedelta
 from dateutil.relativedelta import relativedelta
 from odoo import fields
@@ -247,7 +248,7 @@ class TestContract(TestContractBase):
         self.assertEqual(self.acct_line.last_date_invoiced, last_date_invoiced)
 
     def test_contract_monthly_lastday(self):
-        recurring_next_date = to_date('2018-03-31')
+        recurring_next_date = to_date('2018-02-28')
         last_date_invoiced = to_date('2018-02-22')
         self.acct_line.recurring_next_date = '2018-02-22'
         self.acct_line.recurring_invoicing_type = 'post-paid'
@@ -279,7 +280,7 @@ class TestContract(TestContractBase):
         )
         self.contract.recurring_create_invoice()
         self.assertEqual(
-            self.acct_line.recurring_next_date, to_date('2018-04-01')
+            self.acct_line.recurring_next_date, to_date('2018-3-16')
         )
         self.assertEqual(
             self.acct_line.last_date_invoiced, to_date('2018-02-28')
@@ -537,7 +538,34 @@ class TestContract(TestContractBase):
             'There was an error and the view couldn\'t be opened.',
         )
 
-    def test_compute_first_recurring_next_date(self):
+    def test_get_default_recurring_invoicing_offset(self):
+        clm = self.env['contract.line']
+        self.assertEqual(
+            clm._get_default_recurring_invoicing_offset(
+                "pre-paid", "monthly"
+            ),
+            0
+        )
+        self.assertEqual(
+            clm._get_default_recurring_invoicing_offset(
+                "post-paid", "monthly"
+            ),
+            1
+        )
+        self.assertEqual(
+            clm._get_default_recurring_invoicing_offset(
+                "pre-paid", "monthlylastday"
+            ),
+            0
+        )
+        self.assertEqual(
+            clm._get_default_recurring_invoicing_offset(
+                "post-paid", "monthlylastday"
+            ),
+            0
+        )
+
+    def test_get_next_invoice_date(self):
         """Test different combination to compute recurring_next_date
         Combination format
         {
@@ -547,6 +575,7 @@ class TestContract(TestContractBase):
                 recurring_rule_type,      # ('daily', 'weekly', 'monthly',
                                           #  'monthlylastday', 'yearly'),
                 recurring_interval,       # integer
+                max_date_end,             # date
             ),
         }
         """
@@ -554,64 +583,415 @@ class TestContract(TestContractBase):
         def error_message(
             date_start,
             recurring_invoicing_type,
+            recurring_invoicing_offset,
             recurring_rule_type,
             recurring_interval,
+            max_date_end,
         ):
-            return "Error in %s every %d %s case, start with %s " % (
+            return (
-                recurring_invoicing_type,
+                "Error in %s-%d every %d %s case, "
-                recurring_interval,
+                "start with %s (max_date_end=%s)" % (
-                recurring_rule_type,
+                    recurring_invoicing_type,
-                date_start,
+                    recurring_invoicing_offset,
+                    recurring_interval,
+                    recurring_rule_type,
+                    date_start,
+                    max_date_end,
+                )
             )
 
         combinations = [
             (
                 to_date('2018-01-01'),
-                (to_date('2018-01-01'), 'pre-paid', 'monthly', 1),
+                (to_date('2018-01-01'), 'pre-paid', 0, 'monthly', 1,
+                 False),
             ),
             (
                 to_date('2018-01-01'),
-                (to_date('2018-01-01'), 'pre-paid', 'monthly', 2),
+                (to_date('2018-01-01'), 'pre-paid', 0, 'monthly', 1,
+                 to_date('2018-01-15')),
+            ),
+            (
+                False,
+                (to_date('2018-01-16'), 'pre-paid', 0, 'monthly', 1,
+                 to_date('2018-01-15')),
+            ),
+            (
+                to_date('2018-01-01'),
+                (to_date('2018-01-01'), 'pre-paid', 0, 'monthly', 2,
+                 False),
             ),
             (
                 to_date('2018-02-01'),
-                (to_date('2018-01-01'), 'post-paid', 'monthly', 1),
+                (to_date('2018-01-01'), 'post-paid', 1, 'monthly', 1,
+                 False),
+            ),
+            (
+                to_date('2018-01-16'),
+                (to_date('2018-01-01'), 'post-paid', 1, 'monthly', 1,
+                 to_date('2018-01-15')),
+            ),
+            (
+                False,
+                (to_date('2018-01-16'), 'post-paid', 1, 'monthly', 1,
+                 to_date('2018-01-15')),
             ),
             (
                 to_date('2018-03-01'),
-                (to_date('2018-01-01'), 'post-paid', 'monthly', 2),
+                (to_date('2018-01-01'), 'post-paid', 1, 'monthly', 2,
+                 False),
             ),
             (
                 to_date('2018-01-31'),
-                (to_date('2018-01-05'), 'post-paid', 'monthlylastday', 1),
+                (to_date('2018-01-05'), 'post-paid', 0, 'monthlylastday', 1,
+                 False),
             ),
             (
-                to_date('2018-01-31'),
+                to_date('2018-01-06'),
-                (to_date('2018-01-06'), 'pre-paid', 'monthlylastday', 1),
+                (to_date('2018-01-06'), 'pre-paid', 0, 'monthlylastday', 1,
+                 False),
             ),
             (
                 to_date('2018-02-28'),
-                (to_date('2018-01-05'), 'pre-paid', 'monthlylastday', 2),
+                (to_date('2018-01-05'), 'post-paid', 0, 'monthlylastday', 2,
+                 False),
             ),
             (
                 to_date('2018-01-05'),
-                (to_date('2018-01-05'), 'pre-paid', 'yearly', 1),
+                (to_date('2018-01-05'), 'pre-paid', 0, 'monthlylastday', 2,
+                 False),
+            ),
+            (
+                to_date('2018-01-05'),
+                (to_date('2018-01-05'), 'pre-paid', 0, 'yearly', 1,
+                 False),
             ),
             (
                 to_date('2019-01-05'),
-                (to_date('2018-01-05'), 'post-paid', 'yearly', 1),
+                (to_date('2018-01-05'), 'post-paid', 1, 'yearly', 1,
+                 False),
             ),
         ]
         contract_line_env = self.env['contract.line']
         for recurring_next_date, combination in combinations:
             self.assertEqual(
                 recurring_next_date,
-                contract_line_env._compute_first_recurring_next_date(
+                contract_line_env.get_next_invoice_date(
                     *combination
                 ),
                 error_message(*combination),
             )
 
+    def test_next_invoicing_period(self):
+        """Test different combination for next invoicing period
+        {
+            (
+                'recurring_next_date',    # date
+                'next_period_date_start', # date
+                'next_period_date_end'    # date
+                ): (
+                date_start,               # date
+                date_end,                 # date
+                last_date_invoiced,       # date
+                recurring_next_date,      # date
+                recurring_invoicing_type, # ('pre-paid','post-paid',)
+                recurring_rule_type,      # ('daily', 'weekly', 'monthly',
+                                          #  'monthlylastday', 'yearly'),
+                recurring_interval,       # integer
+                max_date_end,             # date
+            ),
+        }
+        """
+
+        def _update_contract_line(
+            case,
+            date_start,
+            date_end,
+            last_date_invoiced,
+            recurring_next_date,
+            recurring_invoicing_type,
+            recurring_rule_type,
+            recurring_interval,
+            max_date_end,
+        ):
+            self.acct_line.write(
+                {
+                    'date_start': date_start,
+                    'date_end': date_end,
+                    'last_date_invoiced': last_date_invoiced,
+                    'recurring_next_date': recurring_next_date,
+                    'recurring_invoicing_type': recurring_invoicing_type,
+                    'recurring_rule_type': recurring_rule_type,
+                    'recurring_interval': recurring_interval,
+                    'max_date_end': max_date_end,
+                }
+            )
+
+        def _get_result():
+            return Result(
+                recurring_next_date=self.acct_line.recurring_next_date,
+                next_period_date_start=self.acct_line.next_period_date_start,
+                next_period_date_end=self.acct_line.next_period_date_end,
+            )
+
+        def _error_message(
+            case,
+            date_start,
+            date_end,
+            last_date_invoiced,
+            recurring_next_date,
+            recurring_invoicing_type,
+            recurring_rule_type,
+            recurring_interval,
+            max_date_end,
+        ):
+            return (
+                "Error in case %s:"
+                "date_start: %s, "
+                "date_end: %s, "
+                "last_date_invoiced: %s, "
+                "recurring_next_date: %s, "
+                "recurring_invoicing_type: %s, "
+                "recurring_rule_type: %s, "
+                "recurring_interval: %s, "
+                "max_date_end: %s, "
+            ) % (
+                case,
+                date_start,
+                date_end,
+                last_date_invoiced,
+                recurring_next_date,
+                recurring_invoicing_type,
+                recurring_rule_type,
+                recurring_interval,
+                max_date_end,
+            )
+
+        Result = namedtuple(
+            'Result',
+            [
+                'recurring_next_date',
+                'next_period_date_start',
+                'next_period_date_end',
+            ],
+        )
+        Combination = namedtuple(
+            'Combination',
+            [
+                'case',
+                'date_start',
+                'date_end',
+                'last_date_invoiced',
+                'recurring_next_date',
+                'recurring_invoicing_type',
+                'recurring_rule_type',
+                'recurring_interval',
+                'max_date_end',
+            ],
+        )
+        combinations = {
+            Result(
+                recurring_next_date=to_date('2019-01-01'),
+                next_period_date_start=to_date('2019-01-01'),
+                next_period_date_end=to_date('2019-01-31'),
+            ): Combination(
+                case="1",
+                date_start='2019-01-01',
+                date_end=False,
+                last_date_invoiced=False,
+                recurring_next_date='2019-01-01',
+                recurring_invoicing_type='pre-paid',
+                recurring_rule_type='monthly',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2019-01-01'),
+                next_period_date_start=to_date('2019-01-01'),
+                next_period_date_end=to_date('2019-01-15'),
+            ): Combination(
+                case="2",
+                date_start='2019-01-01',
+                date_end='2019-01-15',
+                last_date_invoiced=False,
+                recurring_next_date='2019-01-01',
+                recurring_invoicing_type='pre-paid',
+                recurring_rule_type='monthly',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2019-01-05'),
+                next_period_date_start=to_date('2019-01-05'),
+                next_period_date_end=to_date('2019-01-15'),
+            ): Combination(
+                case="3",
+                date_start='2019-01-05',
+                date_end='2019-01-15',
+                last_date_invoiced=False,
+                recurring_next_date='2019-01-05',
+                recurring_invoicing_type='pre-paid',
+                recurring_rule_type='monthly',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2019-01-05'),
+                next_period_date_start=to_date('2019-01-01'),
+                next_period_date_end=to_date('2019-01-15'),
+            ): Combination(
+                case="4",
+                date_start='2019-01-01',
+                date_end='2019-01-15',
+                last_date_invoiced=False,
+                recurring_next_date='2019-01-05',
+                recurring_invoicing_type='pre-paid',
+                recurring_rule_type='monthly',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2019-02-01'),
+                next_period_date_start=to_date('2019-01-01'),
+                next_period_date_end=to_date('2019-01-31'),
+            ): Combination(
+                case="5",
+                date_start='2019-01-01',
+                date_end=False,
+                last_date_invoiced=False,
+                recurring_next_date='2019-02-01',
+                recurring_invoicing_type='post-paid',
+                recurring_rule_type='monthly',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2019-02-01'),
+                next_period_date_start=to_date('2019-01-01'),
+                next_period_date_end=to_date('2019-01-15'),
+            ): Combination(
+                case="6",
+                date_start='2019-01-01',
+                date_end='2019-01-15',
+                last_date_invoiced=False,
+                recurring_next_date='2019-02-01',
+                recurring_invoicing_type='post-paid',
+                recurring_rule_type='monthly',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2019-02-01'),
+                next_period_date_start=to_date('2019-01-05'),
+                next_period_date_end=to_date('2019-01-31'),
+            ): Combination(
+                case="7",
+                date_start='2019-01-05',
+                date_end=False,
+                last_date_invoiced=False,
+                recurring_next_date='2019-02-01',
+                recurring_invoicing_type='post-paid',
+                recurring_rule_type='monthly',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2019-01-05'),
+                next_period_date_start=to_date('2019-01-01'),
+                next_period_date_end=to_date('2019-01-15'),
+            ): Combination(
+                case="8",
+                date_start='2019-01-01',
+                date_end='2019-01-15',
+                last_date_invoiced=False,
+                recurring_next_date='2019-01-05',
+                recurring_invoicing_type='pre-paid',
+                recurring_rule_type='monthly',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2019-01-01'),
+                next_period_date_start=to_date('2018-12-16'),
+                next_period_date_end=to_date('2019-01-31'),
+            ): Combination(
+                case="9",
+                date_start='2018-01-01',
+                date_end='2020-01-15',
+                last_date_invoiced='2018-12-15',
+                recurring_next_date='2019-01-01',
+                recurring_invoicing_type='pre-paid',
+                recurring_rule_type='monthly',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2019-01-01'),
+                next_period_date_start=to_date('2018-12-16'),
+                next_period_date_end=to_date('2018-12-31'),
+            ): Combination(
+                case="10",
+                date_start='2018-01-01',
+                date_end='2020-01-15',
+                last_date_invoiced='2018-12-15',
+                recurring_next_date='2019-01-01',
+                recurring_invoicing_type='post-paid',
+                recurring_rule_type='monthly',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2018-12-31'),
+                next_period_date_start=to_date('2018-12-16'),
+                next_period_date_end=to_date('2018-12-31'),
+            ): Combination(
+                case="11",
+                date_start='2018-01-01',
+                date_end='2020-01-15',
+                last_date_invoiced='2018-12-15',
+                recurring_next_date='2018-12-31',
+                recurring_invoicing_type='post-paid',
+                recurring_rule_type='monthlylastday',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2018-12-16'),
+                next_period_date_start=to_date('2018-12-16'),
+                next_period_date_end=to_date('2018-12-31'),
+            ): Combination(
+                case="12",
+                date_start='2018-01-01',
+                date_end='2020-01-15',
+                last_date_invoiced='2018-12-15',
+                recurring_next_date='2018-12-16',
+                recurring_invoicing_type='pre-paid',
+                recurring_rule_type='monthlylastday',
+                recurring_interval=1,
+                max_date_end=False,
+            ),
+            Result(
+                recurring_next_date=to_date('2018-01-05'),
+                next_period_date_start=to_date('2018-01-05'),
+                next_period_date_end=to_date('2018-03-31'),
+            ): Combination(
+                case="12",
+                date_start='2018-01-05',
+                date_end='2020-01-15',
+                last_date_invoiced=False,
+                recurring_next_date='2018-01-05',
+                recurring_invoicing_type='pre-paid',
+                recurring_rule_type='monthlylastday',
+                recurring_interval=3,
+                max_date_end=False,
+            ),
+        }
+        for result, combination in combinations.items():
+            _update_contract_line(*combination)
+            self.assertEqual(
+                result, _get_result(), _error_message(*combination)
+            )
+
     def test_recurring_next_date(self):
         """recurring next date for a contract is the min for all lines"""
         self.contract.recurring_create_invoice()
@@ -1331,7 +1711,7 @@ class TestContract(TestContractBase):
             len(invoice_lines),
         )
 
-    def test_get_period_to_invoice_monthlylastday(self):
+    def test_get_period_to_invoice_monthlylastday_postpaid(self):
         self.acct_line.date_start = '2018-01-05'
         self.acct_line.recurring_invoicing_type = 'post-paid'
         self.acct_line.recurring_rule_type = 'monthlylastday'
@@ -1362,6 +1742,67 @@ class TestContract(TestContractBase):
         self.assertEqual(last, to_date('2018-03-15'))
         self.acct_line.manual_renew_needed = True
 
+    def test_get_period_to_invoice_monthlylastday_prepaid(self):
+        self.acct_line.date_start = '2018-01-05'
+        self.acct_line.recurring_invoicing_type = 'pre-paid'
+        self.acct_line.recurring_rule_type = 'monthlylastday'
+        self.acct_line.date_end = '2018-03-15'
+        self.acct_line._onchange_date_start()
+        first, last, recurring_next_date = \
+            self.acct_line._get_period_to_invoice(
+                self.acct_line.last_date_invoiced,
+                self.acct_line.recurring_next_date,
+            )
+        self.assertEqual(first, to_date('2018-01-05'))
+        self.assertEqual(last, to_date('2018-01-31'))
+        self.assertEqual(recurring_next_date, to_date('2018-01-05'))
+        self.assertEqual(
+            self.acct_line.recurring_next_date, to_date('2018-01-05')
+        )
+        self.contract.recurring_create_invoice()
+        first, last, recurring_next_date = \
+            self.acct_line._get_period_to_invoice(
+                self.acct_line.last_date_invoiced,
+                self.acct_line.recurring_next_date,
+            )
+        self.assertEqual(first, to_date('2018-02-01'))
+        self.assertEqual(last, to_date('2018-02-28'))
+        self.assertEqual(recurring_next_date, to_date('2018-02-01'))
+        self.assertEqual(
+            self.acct_line.recurring_next_date, to_date('2018-02-01')
+        )
+        self.assertEqual(
+            self.acct_line.last_date_invoiced, to_date('2018-01-31')
+        )
+        self.contract.recurring_create_invoice()
+        first, last, recurring_next_date = \
+            self.acct_line._get_period_to_invoice(
+                self.acct_line.last_date_invoiced,
+                self.acct_line.recurring_next_date,
+            )
+        self.assertEqual(first, to_date('2018-03-01'))
+        self.assertEqual(last, to_date('2018-03-15'))
+        self.assertEqual(recurring_next_date, to_date('2018-03-01'))
+        self.assertEqual(
+            self.acct_line.recurring_next_date, to_date('2018-03-01')
+        )
+        self.assertEqual(
+            self.acct_line.last_date_invoiced, to_date('2018-02-28')
+        )
+        self.contract.recurring_create_invoice()
+        first, last, recurring_next_date = \
+            self.acct_line._get_period_to_invoice(
+                self.acct_line.last_date_invoiced,
+                self.acct_line.recurring_next_date,
+            )
+        self.assertFalse(first)
+        self.assertFalse(last)
+        self.assertFalse(recurring_next_date)
+        self.assertFalse(self.acct_line.recurring_next_date)
+        self.assertEqual(
+            self.acct_line.last_date_invoiced, to_date('2018-03-15')
+        )
+
     def test_get_period_to_invoice_monthly_pre_paid_2(self):
         self.acct_line.date_start = '2018-01-05'
         self.acct_line.recurring_invoicing_type = 'pre-paid'

contract/views/abstract_contract_line.xml

@@ -59,8 +59,8 @@
                             </div>
                         </group>
                         <group>
-                            <field name="recurring_invoicing_type"
+                            <field name="recurring_invoicing_type"/>
-                                   attrs="{'invisible': [('recurring_rule_type', '=', 'monthlylastday')]}"/>
+                            <field name="recurring_invoicing_offset"/>
                         </group>
                     </group>
                 </sheet>

contract/views/contract_line.xml

@@ -15,11 +15,13 @@
                 <group>
                     <field name="create_invoice_visibility" invisible="1"/>
                     <field name="date_start" required="1"/>
+                    <field name="next_period_date_start"/>
                     <field name="recurring_next_date"/>
                 </group>
                 <group>
                     <field name="date_end"
                            attrs="{'required': [('is_auto_renew', '=', True)]}"/>
+                    <field name="next_period_date_end"/>
                 </group>
                 <group groups="base.group_no_one">
                     <field name="last_date_invoiced" readonly="True"/>

contract_sale_mandate/tests/test_contract_sale_mandate.py

@@ -26,6 +26,7 @@ class TestContractSaleMandate(TestContractBase):
                 'is_contract': True,
                 'default_qty': 12,
                 'recurring_rule_type': "monthlylastday",
+                'recurring_invoicing_type': "post-paid",
                 'contract_template_id': cls.contract_template1.id,
             }
         )

product_contract/migrations/12.0.3.0.0/pre-migration.py

@@ -0,0 +1,10 @@
+def migrate(cr, version):
+    # pre-paid/post-paid becomes significant for monthlylastday too,
+    # make sure it has the value that was implied for previous versions.
+    cr.execute(
+        """\
+            UPDATE product_template
+            SET recurring_invoicing_type = 'post-paid'
+            WHERE recurring_rule_type = 'monthlylastday'
+        """
+    )

product_contract/tests/test_sale_order.py

@@ -43,6 +43,7 @@ class TestSaleOrder(TransactionCase):
                 'is_contract': True,
                 'default_qty': 12,
                 'recurring_rule_type': "monthlylastday",
+                'recurring_invoicing_type': "post-paid",
                 'contract_template_id': self.contract_template1.id,
             }
         )

product_contract/views/product_template.xml

@@ -33,8 +33,7 @@
                         </group>
                         <group>
                             <field name="default_qty"/>
-                            <field name="recurring_invoicing_type"
+                            <field name="recurring_invoicing_type"/>
-                            attrs="{'invisible': [('recurring_rule_type', '=', 'monthlylastday')]}"/>
                         </group>
                     </group>
                     <group>

product_contract/views/sale_order.xml

@@ -58,8 +58,7 @@
                     <field name="recurring_rule_type"/>
                 </group>
                 <group attrs="{'invisible': [('is_contract', '=', False)]}">
-                    <field name="recurring_invoicing_type"
+                    <field name="recurring_invoicing_type"/>
-                           attrs="{'invisible': [('recurring_rule_type', '=', 'monthlylastday')]}"/>
                 </group>
                 <group attrs="{'invisible': [('is_contract', '=', False)]}">
                     <field name="date_start"