[ADD] automatic_invoice: Implemented automated invoice sending by email

automatic_invoice/__init__.py

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+from . import models

automatic_invoice/__manifest__.py

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+{
+    'name': 'Automatic invoicing',
+    'version': '1.0',
+    'category': 'Accounting',
+    'summary': 'Configure a schedule to send customer invoices automatically',
+    'depends': ['account'],
+    'data': [
+        'data/ir_cron.xml',
+        'views/res_config_settings_views.xml'
+    ],
+    'installable': True,
+    'license': 'LGPL-3'
+}

automatic_invoice/data/ir_cron.xml

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+<odoo>
+    <record id="ir_cron_send_email_invoice" model="ir.cron">
+        <field name="name">Send Automatic Invoice 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">12</field>
+        <field name="interval_type">hours</field>
+        <field name="active">True</field>
+    </record>
+</odoo>

automatic_invoice/models/__init__.py

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+from . import res_config_settings
+from . import account_move

automatic_invoice/models/account_move.py

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+from odoo import fields, models
+from datetime import timedelta
+
+
+class AccountMove(models.Model):
+    _inherit = 'account.move'
+
+    is_auto_email_sent = fields.Boolean(default=False)
+
+    def _send_email_invoice(self):
+        if not self.env['ir.config_parameter'].sudo().get_param('automatic_invoice.enable_auto_invoice_sending'):
+            return
+
+        try:
+            days_str = self.env['ir.config_parameter'].sudo().get_param('automatic_invoice.invoice_send_delay_days')
+            days = int(days_str)
+        except ValueError:
+            return
+
+        target_date = fields.Datetime.now() - timedelta(days=days)
+        invoices_to_send = self.search([
+            ('state', '=', 'posted'),
+            ('move_type', '=', 'out_invoice'),
+            ('is_auto_email_sent', '=', False),
+            ('invoice_date', '<=', target_date)
+        ])
+
+        template = self.env.ref('account.email_template_edi_invoice', raise_if_not_found=False)
+        if not template:
+            return
+
+        for invoice in invoices_to_send:
+            template.send_mail(invoice.id, force_send=True)
+            invoice.is_auto_email_sent = True

automatic_invoice/models/res_config_settings.py

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+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = 'res.config.settings'
+
+    enable_auto_invoice_sending = fields.Boolean(
+        string="Send invoice by email",
+        config_parameter="automatic_invoice.enable_auto_invoice_sending"
+    )
+    invoice_send_delay_days = fields.Integer(
+        string="Duration of days after the date of invoice",
+        config_parameter="automatic_invoice.invoice_send_delay_days"
+    )

automatic_invoice/views/res_config_settings_views.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+
+    <record id="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='display_invoice_tax_company_currency']" position="after">
+                <setting id="automatic_send_invoice" help="Send invoices automatically through email by configuring the duration">
+                    <field name="enable_auto_invoice_sending" />
+                    <div invisible="not enable_auto_invoice_sending">
+                        <label for="invoice_send_delay_days" />
+                        <field name="invoice_send_delay_days" />
+                    </div>
+                </setting>
+            </xpath>
+        </field>
+    </record>
+
+</odoo>