from collections import Counter

from odoo import _, api, Command, fields, models
from odoo.exceptions import RedirectWarning, UserError


class AccountMoveSendBatchWizard(models.TransientModel):
    """Wizard that handles the sending of multiple invoices."""
    _name = 'account.move.send.batch.wizard'
    _inherit = ['account.move.send']
    _description = "Account Move Send Batch Wizard"

    move_ids = fields.Many2many(comodel_name='account.move', required=True)
    summary_data = fields.Json(compute='_compute_summary_data')
    alerts = fields.Json(compute='_compute_alerts')

    # -------------------------------------------------------------------------
    # DEFAULTS
    # -------------------------------------------------------------------------

    @api.model
    def default_get(self, fields_list):
        # EXTENDS 'base'
        results = super().default_get(fields_list)
        if 'move_ids' in fields_list and 'move_ids' not in results:
            move_ids = self._context.get('active_ids', [])
            results['move_ids'] = [Command.set(move_ids)]
        return results

    # -------------------------------------------------------------------------
    # COMPUTES
    # -------------------------------------------------------------------------

    @api.depends('move_ids')
    def _compute_summary_data(self):
        extra_edis = self._get_all_extra_edis()
        sending_methods = dict(self.env['res.partner']._fields['invoice_sending_method'].selection)
        sending_methods['manual'] = _('Manually')  # in batch sending, everything is done asynchronously, we never "Download"

        for wizard in self:
            edi_counter = Counter()
            sending_method_counter = Counter()

            for move in wizard.move_ids:
                edi_counter += Counter([edi for edi in self._get_default_extra_edis(move)])
                sending_settings = self._get_default_sending_settings(move)
                sending_method = next(iter(sending_settings['sending_methods']))  # In batch sending & in 18.0 there can only have !one sending method per move.
                if self._is_applicable_to_move(sending_method, move, **sending_settings):
                    sending_method_counter[sending_method] += 1

            summary_data = dict()
            for edi, edi_count in edi_counter.items():
                summary_data[edi] = {'count': edi_count, 'label': _("by %s", extra_edis[edi]['label'])}
            for sending_method, sending_method_count in sending_method_counter.items():
                summary_data[sending_method] = {'count': sending_method_count, 'label': sending_methods[sending_method]}

            wizard.summary_data = summary_data

    @api.depends('summary_data')
    def _compute_alerts(self):
        for wizard in self:
            moves_data = {move: self._get_default_sending_settings(move) for move in wizard.move_ids}
            wizard.alerts = self._get_alerts(wizard.move_ids, moves_data)

    # -------------------------------------------------------------------------
    # CONSTRAINS
    # -------------------------------------------------------------------------

    @api.constrains('move_ids')
    def _check_move_ids_constrains(self):
        for wizard in self:
            self._check_move_constrains(wizard.move_ids)

    # -------------------------------------------------------------------------
    # ACTIONS
    # -------------------------------------------------------------------------

    def action_send_and_print(self, force_synchronous=False, allow_fallback_pdf=False):
        """ Launch asynchronously the generation and sending of invoices."""
        self.ensure_one()
        if self.alerts:
            self._raise_danger_alerts(self.alerts)
        if force_synchronous:
            self.env['account.move.send']._generate_and_send_invoices(self.move_ids, allow_fallback_pdf=allow_fallback_pdf)
            return

        account_move_send_cron = self.env.ref('account.ir_cron_account_move_send')
        if not account_move_send_cron.sudo().active:
            if self.env.user.has_group('base.group_system'):
                raise RedirectWarning(
                    _("Batch invoice sending is unavailable. Please, activate the cron to enable batch sending of invoices."),
                    {
                        'views': [(False, 'form')],
                        'res_model': 'ir.cron',
                        'type': 'ir.actions.act_window',
                        'res_id': account_move_send_cron.id,
                        'target': 'current',
                    },
                    _("Go to cron configuration"),
                )
            raise UserError(_("Batch invoice sending is unavailable. Please, contact your system administrator to activate the cron to enable batch sending of invoices."))

        self.move_ids.sending_data = {
            'author_user_id': self.env.user.id,
            'author_partner_id': self.env.user.partner_id.id,
        }
        account_move_send_cron._trigger()
        return {
            'type': 'ir.actions.client',
            'tag': 'display_notification',
            'params': {
                'type': 'info',
                'title': _('Sending invoices'),
                'message': _('Invoices are being sent in the background.'),
                'next': {'type': 'ir.actions.act_window_close'},
            },
        }