# © 2013-2016 Akretion - Alexis de Lattre <alexis.delattre@akretion.com>
# © 2014 Serv. Tecnol. Avanzados - Pedro M. Baeza
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).

from flectra import models, fields, api, exceptions, _
from datetime import datetime
from dateutil.relativedelta import relativedelta
import logging

NUMBER_OF_UNUSED_MONTHS_BEFORE_EXPIRY = 36

logger = logging.getLogger(__name__)


class AccountBankingMandate(models.Model):
    """SEPA Direct Debit Mandate"""
    _inherit = 'account.banking.mandate'
    _rec_name = 'display_name'

    format = fields.Selection(
        selection_add=[('sepa', 'Sepa Mandate')], default='sepa')
    type = fields.Selection(
        selection_add=[
            ('recurrent', 'Recurrent'),
            ('oneoff', 'One-Off')
        ])
    recurrent_sequence_type = fields.Selection(
        [('first', 'First'),
         ('recurring', 'Recurring'),
         ('final', 'Final')],
        string='Sequence Type for Next Debit', track_visibility='onchange',
        help="This field is only used for Recurrent mandates, not for "
             "One-Off mandates.", default="first")
    scheme = fields.Selection([
        ('CORE', 'Basic (CORE)'),
        ('B2B', 'Enterprise (B2B)')],
        string='Scheme', default="CORE", track_visibility='onchange')
    unique_mandate_reference = fields.Char(size=35)  # cf ISO 20022
    display_name = fields.Char(compute='compute_display_name', store=True)

    @api.multi
    @api.constrains('type', 'recurrent_sequence_type')
    def _check_recurring_type(self):
        for mandate in self:
            if (mandate.type == 'recurrent' and
                    not mandate.recurrent_sequence_type):
                raise exceptions.Warning(
                    _("The recurrent mandate '%s' must have a sequence type.")
                    % mandate.unique_mandate_reference)

    @api.multi
    @api.depends('unique_mandate_reference', 'recurrent_sequence_type')
    def compute_display_name(self):
        for mandate in self:
            if mandate.format == 'sepa':
                name = '%s (%s)' % (
                    mandate.unique_mandate_reference,
                    mandate.recurrent_sequence_type)
            else:
                name = mandate.unique_mandate_reference
            mandate.display_name = name

    @api.multi
    @api.onchange('partner_bank_id')
    def mandate_partner_bank_change(self):
        for mandate in self:
            super(AccountBankingMandate, self).mandate_partner_bank_change()
            res = {}
            if (
                mandate.state == 'valid' and
                mandate.partner_bank_id and
                mandate.type == 'recurrent' and
                mandate.recurrent_sequence_type != 'first'
            ):
                mandate.recurrent_sequence_type = 'first'
                res['warning'] = {
                    'title': _('Mandate update'),
                    'message': _("As you changed the bank account attached "
                                 "to this mandate, the 'Sequence Type' has "
                                 "been set back to 'First'."),
                }
            return res

    @api.model
    def _sdd_mandate_set_state_to_expired(self):
        logger.info('Searching for SDD Mandates that must be set to Expired')
        expire_limit_date = datetime.today() + relativedelta(
            months=-NUMBER_OF_UNUSED_MONTHS_BEFORE_EXPIRY)
        expire_limit_date_str = expire_limit_date.strftime('%Y-%m-%d')
        expired_mandates = self.search(
            ['|',
             ('last_debit_date', '=', False),
             ('last_debit_date', '<=', expire_limit_date_str),
             ('state', '=', 'valid'),
             ('signature_date', '<=', expire_limit_date_str)])
        if expired_mandates:
            expired_mandates.write({'state': 'expired'})
            logger.info(
                'The following SDD Mandate IDs has been set to expired: %s'
                % expired_mandates.ids)
        else:
            logger.info('0 SDD Mandates had to be set to Expired')
        return True