[IMP] send_invoice_email: add cron job to send invoices automatically…

send_invoice_email/__init__.py

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+from . import models

send_invoice_email/__manifest__.py

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+{
+    'name': 'Send Invoice Email',
+    'version': '1.0',
+    'summary': 'Automatically send invoices by email after configurable days',
+    'author': 'rodh',
+    'category': 'Accounting',
+     "license": "LGPL-3",
+    'depends': [
+        'account',
+        'base',
+    ],
+    'data': [
+        'views/res_config_settings_view.xml',
+        'views/ir_cron_data.xml',
+    ],
+    'installable': True,
+    'application': False,
+    'auto_install': False,
+}

send_invoice_email/models/__init__.py

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+from . import res_config_settings
+from . import account_move

send_invoice_email/models/account_move.py

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+from odoo import fields, models
+from datetime import timedelta
+
+
+class AccountMove(models.Model):
+    _inherit = 'account.move'
+
+    def _send_email_invoice(self):
+
+        hour = self.env['ir.config_parameter'].sudo().get_param('send_invoice_email.send_invoice_by_email')
+
+        if hour is None:
+            return
+
+        try:
+            hour = int(hour)
+        except ValueError:
+            return
+
+        target_date = fields.Datetime.now() - timedelta(hours=hour)
+
+        invoices = self.search([
+    ('invoice_date', '<=', target_date.date()),
+    ('payment_state', '!=', 'paid'),
+    ('state', '=', 'posted')
+])
+
+        template = self.env.ref('account.email_template_edi_invoice', raise_if_not_found=False)
+        if not template:
+            return
+
+        for invoice in invoices:
+            template.send_mail(invoice.id, force_send=True)

send_invoice_email/models/res_config_settings.py

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+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = 'res.config.settings'
+
+    send_invoice_by_email = fields.Integer(string='Send invoice by email after (days)', config_parameter="send_invoice_email.send_invoice_by_email")

send_invoice_email/views/ir_cron_data.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="ir_cron_send_email_invoice" model="ir.cron">
+        <field name="name">Send Invoice By Email</field>
+        <field name="model_id" ref="account.model_account_move"/>
+        <field name="state">code</field>
+        <field name="code">model._send_email_invoice()</field>
+        <field name="interval_number">1</field>
+        <field name="interval_type">hours</field>
+        <field name="active">True</field>
+    </record>
+</odoo>

send_invoice_email/views/res_config_settings_view.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="view_res_config_settings_view" model="ir.ui.view">
+        <field name="name">res.config.settings.inherit.view.form</field>
+        <field name="model">res.config.settings</field>
+        <field name="inherit_id" ref="account.res_config_settings_view_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//block//setting[@id='total_amount_words']" position="after">
+                <setting id="automatic_send_invoice">
+                    <label for="send_invoice_by_email" />
+                    <div>
+                        <field name="send_invoice_by_email" class="oe_inline" />
+                        <span>hours</span>
+                    </div>
+                </setting>
+            </xpath>
+        </field>
+    </record>
+</odoo>