[ADD] invoice_send_automatic: create automated action for sending mail

invoice_send_automatic/__init__.py

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+from . import models

invoice_send_automatic/__manifest__.py

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+{
+    "name": "Automated Action Send Invoice Sales",
+    "version": "1.0",
+    "depends": ["base", "sale_management", "accountant"],
+    "data": ["views/res_config_settings_views.xml", "data/ir_cron.xml"],
+    "sequence": 1,
+    "application": True,
+    "license": "OEEL-1",
+}

invoice_send_automatic/data/ir_cron.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <record id="ir_cron_automatic_invoice" model="ir.cron">
+        <field name="name">Automatic Send Invoice after due days</field>
+        <field name="model_id" ref="account.model_account_move" />
+        <field name="user_id" ref="base.user_root" />
+        <field name="state">code</field>
+        <field name="code">model.method_to_send_invoice_automatically()</field>
+        <field name="interval_number">1</field>
+        <field name="interval_type">days</field>
+        <field name="active" eval="True" />
+    </record>
+</odoo>

invoice_send_automatic/models/__init__.py

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+from . import res_config_settings
+from . import account_move

invoice_send_automatic/models/account_move.py

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+from odoo import api, models
+from datetime import date, timedelta
+
+
+class AccountMove(models.Model):
+    _inherit = "account.move"
+
+    def _send_invoice_email(self):
+        self.ensure_one()
+
+        template = self.env.ref("account.email_template_edi_invoice")
+        template.send_mail(self.id)
+        self.message_post(body="Invoice automatically sent by cron job.")
+
+    @api.model
+    def method_to_send_invoice_automatically(self):
+        automatic_send_invoice_days = int(
+            self.env["ir.config_parameter"]
+            .sudo()
+            .get_param("invoice_send_automatic.automatic_send_invoice_days")
+        )
+        target_invoice_date = date.today() - timedelta(days=automatic_send_invoice_days)
+
+        invoices_to_send = self.search(
+            [
+                ("state", "=", "posted"),
+                ("move_type", "in", ("out_invoice", "out_refund")),
+                ("invoice_date", "=", target_invoice_date),
+            ]
+        )
+        for invoice in invoices_to_send:
+            invoice._send_invoice_email()

invoice_send_automatic/models/res_config_settings.py

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+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = "res.config.settings"
+
+    automatic_send_invoice_days = fields.Integer(
+        related="company_id.account_tax_periodicity_reminder_day",
+        readonly=False,
+        config_parameter="invoice_send_automatic.automatic_send_invoice_days",
+    )

invoice_send_automatic/views/res_config_settings_views.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+
+    <record id="res_config_settings_view_form_inherit" 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" help="Duration in days after the invoice" string="Send invoice by email ">
+                    <div>
+                        <field name="automatic_send_invoice_days" />
+                        <span>days</span>
+                    </div>
+                </setting> 
+            </xpath>
+        </field>
+    </record>
+
+</odoo>