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

In this task,
add module which send invoice by email automatically.
in settings fill field enter the number of days to send email after the
invoice date. the purpose of the task is that do not need to send invoice
by manually it will automatically send by email depend upon
how many days will be selected.

Author: gasa-odoo

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>