[ADD] send_invoice: add send invoice automatically by email module

send_invoice/__init__.py

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+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from . import models

send_invoice/__manifest__.py

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+{
+    "name": "send invoice via mail",
+    "version": "1.0",
+    "author": "gasa",
+    "license": "LGPL-3",
+    "depends": ["account"],
+    "application": True,
+    "installable": True,
+    "data": [
+        "views/res_config_settings.xml"
+    ]
+}

send_invoice/models/__init__.py

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+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from . import res_config_settings
+from . import send_email

send_invoice/models/res_config_settings.py

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+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = "res.config.settings"
+
+    send_invoice_via_email = fields.Integer(String="send invoice by email", config_parameter="send_invoice.send_invoice_via_email"
+)

send_invoice/models/send_email.py

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+
+from odoo import models, fields
+from datetime import timedelta
+
+
+class SendEmail(models.Model):
+    _inherit = "account.move"
+
+    def _send_email_invoice(self):
+        """
+        Use sudo() to bypass access rights when reading system parameters.
+        Using sudo ensures the method can always retrieve the configuration
+        value regardless of the user's permissions.
+        """
+        hour = self.env['ir.config_parameter'].sudo().get_param('send_invoice.send_invoice_via_email')
+        if not hour:
+            return
+
+        try:
+            hour = int(hour)
+        except ValueError:
+            return
+
+        target_date = fields.Datetime.now() - timedelta(hours=hour)
+        invoices = self.search([
+            ('invoice_date', '=', target_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/views/ir_corn_send_email.xml

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+<odoo>
+    <record id="ir_cron_send_email_invoice" model="ir.cron">
+        <field name="name">Send 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">6</field>
+        <field name="interval_type">hours</field>
+        <field name="active" eval="True" />
+    </record>
+</odoo>

send_invoice/views/res_config_settings.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='total_amount_words']"
+                position="after">
+                <setting id="automatic_send_invoice" >
+                    <label for="send_invoice_via_email" />
+                    <div>
+                        <field name="send_invoice_via_email" class="oe_inline" />
+                        <span>hours</span>
+                    </div>
+                </setting>
+            </xpath>
+        </field>
+    </record>
+</odoo>