[ADD] installment: added installment app

After this commit:
- implemented installment module
- added wizard button in subscription module

installement/__init__.py

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+from . import models
+from . import wizard

installement/__manifest__.py

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+{
+    'name': 'Installement App',
+    'version': '17.0',
+    'depends': ['base', 'sale'],
+    'license': 'LGPL-3',
+    'data': [
+        'security/ir.model.access.csv',
+        'wizard/add_emi_button_wizard_views.xml',
+        'views/add_emi_button_views.xml',
+        'views/res_config_settings_views.xml'
+    ],
+    'installable': True,
+    'application': True,
+}

installement/models/__init__.py

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+from . import res_config_settings

installement/models/res_config_settings.py

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+from odoo import models, fields
+
+
+class ResConfigSettings(models.TransientModel):
+
+    _inherit = "res.config.settings"
+
+    max_duration = fields.Float(
+        string="Max Duration", config_parameter='installement.max_duration')
+    annual_rate_percentage = fields.Float(
+        string='Annual Rate Percentage', config_parameter='installement.annual_rate_percentage')
+    down_payment_percentage = fields.Float(
+        string="Down Payment Percentage", config_parameter='installement.down_payment_percentage')
+    administrative_expenses_percentage = fields.Float(
+        string='Administrative Expenses Percentage', config_parameter='installement.administrative_expenses_percentage')
+    delay_penalty_percentage = fields.Float(
+        string="Delay Penalty Percentage", config_parameter='installement.delay_penalty_percentage')
+    delay_penalty_process = fields.Float(
+        string='Delay Penalty Process', config_parameter='installement.delay_penalty_process')
+
+    nid = fields.Boolean("Nid")
+    salary_component = fields.Boolean('Salary Component')
+    bank_statement = fields.Boolean('Bank Statement')
+    bank_rate_letter = fields.Boolean('Bank Rate Letter')
+    rental_contract = fields.Boolean('Rental Contract')
+    ownership_contract = fields.Boolean('Ownership Contract')

installement/security/ir.model.access.csv

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+id,name,model_id/id,group_id/id,perm_read,perm_write,perm_create,perm_unlink
+access_add_emi_button_wizard,access_add_emi_button_wizard,model_add_emi_button_wizard,base.group_user,1,1,1,1

installement/views/add_emi_button_views.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="add_emi_button_views_form" model="ir.ui.view">
+        <field name="name">sale.order.form</field>
+        <field name="model">sale.order</field>
+        <field name="inherit_id" ref="sale.view_order_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//div[@name='so_button_below_order_lines']" position='inside'>
+                <button name="%(installement.add_emi_button_wizard_action)d"
+                    type="action"
+                    string="Add Emi"
+                    class="btn btn-primary" />
+            </xpath>
+        </field>
+    </record>
+</odoo>

installement/views/res_config_settings_views.xml

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+<odoo>
+    <record id="res_config_settings_view_form" model="ir.ui.view">
+        <field name="name">res.config.settings.view.form.inherit.base.setup</field>
+        <field name="model">res.config.settings</field>
+        <field name="priority" eval="0" />
+        <field name="inherit_id" ref="base.res_config_settings_view_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//block[@name='integration']" position="after">
+                <block title="Installement Process" name="installement_process">
+                    <setting id="max_duration" help="Define max duration">
+                        <field name="max_duration" />
+                        <a>Years</a>
+                    </setting>
+                    <setting id="annual_rate_percentage" help="Define Annual Rate Percentage">
+                        <field name="annual_rate_percentage" />
+                        <a>% Per Year</a>
+                    </setting>
+                    <setting id="down_payment_percentage" help="Define Down Payment Percentage">
+                        <field name="down_payment_percentage" />
+                        <a>% From Product Price</a>
+                    </setting>
+                    <setting id="administrative_expenses_percentage"
+                        help="Define Administrative Expenses Percentage">
+                        <field name="administrative_expenses_percentage" />
+                        <a>% From Amount After D.Payment</a>
+                    </setting>
+                    <setting id="delay_penalty_percentage" help="Define Delay Penalty Percentage">
+                        <field name="delay_penalty_percentage" />
+                        <a>% From Monthly Amount</a>
+                    </setting>
+                    <setting id="delay_penalty_process" help="Define Delay Penalty Process">
+                        <field name="delay_penalty_process" />
+                        <a>Days</a>
+                        <br />
+                        <help>Delay penalty percentage will be applied after exceed the delay
+                            process period. </help>
+                    </setting>
+                </block>
+                <block title="Needed Documents" name="needed_documents">
+                    <setting id="nid">
+                        <field name="nid" />
+                    </setting>
+                    <setting id="salary_component">
+                        <field name="salary_component" />
+                    </setting>
+                    <setting id="bank_statement">
+                        <field name="bank_statement" />
+                    </setting>
+                    <setting id="bank_rate_letter">
+                        <field name="bank_rate_letter" />
+                    </setting>
+                    <setting id="rental_contract">
+                        <field name="rental_contract" />
+                    </setting>
+                    <setting id="ownership_contract">
+                        <field name="ownership_contract" />
+                    </setting>
+                </block>
+            </xpath>
+        </field>
+    </record>
+</odoo>

installement/wizard/__init__.py

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+from . import add_emi_button_wizard

installement/wizard/add_emi_button_wizard.py

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+from odoo import models, fields, api
+
+
+class AddEmiButtonWizard(models.TransientModel):
+
+    _name = "add.emi.button.wizard"
+    _description = "Add Emi Button Wizard"
+
+    total_sale_amount = fields.Float(
+        string="Total sale Amount", readonly=True)
+    down_payment = fields.Float(compute="_compute_values")
+    remaining_amount = fields.Float(compute="_compute_values")
+    interest = fields.Float(compute='_compute_values')
+    number_of_monthly_installement = fields.Integer(compute='_compute_values')
+    installement_amount = fields.Float(readonly=True)
+    admin_expense = fields.Float(compute='_compute_values')
+    remaining_amount_2 = fields.Float(compute='_compute_values')
+
+    def default_get(self, fields_list):
+        defaults = super().default_get(fields_list)
+        defaults['total_sale_amount'] = self.env['sale.order'].browse(
+            self.env.context.get('active_id')).amount_total
+        return defaults
+
+    @api.depends("total_sale_amount")
+    def _compute_values(self):
+        for rec in self:
+            down_payment_percent = self.env['ir.config_parameter'].get_param(
+                'installement.down_payment_percentage')
+            x = float(rec.total_sale_amount) * float(down_payment_percent)
+            rec.down_payment = x / 100
+
+            # remaining amount
+            rec.remaining_amount = rec.total_sale_amount - rec.down_payment
+
+            # admin expense
+            administrative_expenses_percentage = self.env['ir.config_parameter'].get_param(
+                'installement.administrative_expenses_percentage')
+            y = float(rec.remaining_amount) * \
+                float(administrative_expenses_percentage)
+            rec.admin_expense = y / 100
+
+            # toal remaining amount
+            rec.remaining_amount_2 = rec.remaining_amount + rec.admin_expense
+
+            annual_rate_percentage = self.env['ir.config_parameter'].get_param(
+                'installement.annual_rate_percentage')
+            z = float(rec.remaining_amount_2) * float(annual_rate_percentage)
+            rec.interest = z / 100
+
+            max_dur = float(self.env['ir.config_parameter'].get_param(
+                'installement.max_duration'))
+            rec.number_of_monthly_installement = float(max_dur) * 12
+
+            rec.installement_amount = (
+                rec.remaining_amount_2 + rec.interest)/rec.number_of_monthly_installement

installement/wizard/add_emi_button_wizard_views.xml

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+<?xml version="1.0"?>
+<odoo>
+    <record id="add_emi_button_wizard_views_form" model="ir.ui.view">
+        <field name="name">add.emi.button.wizard.form</field>
+        <field name="model">add.emi.button.wizard</field>
+        <field name="arch" type="xml">
+            <form string='Add Offer'>
+                <sheet>
+                    <group>
+                        <field name="total_sale_amount" />
+                        <field name="down_payment" />
+                        <field name="remaining_amount" />
+                        <field name="interest" />
+                        <field name="number_of_monthly_installement" />
+                        <field name="installement_amount" />
+                    </group>
+                    <footer>
+                        <button name="add_installement" type='object' string='Add Installement'
+                            class='btn-primary' />
+                        <button string='Cancel' class='btn-secondary' special='cancel' />
+                    </footer>
+                </sheet>
+            </form>
+        </field>
+    </record>
+
+    <record id="add_emi_button_wizard_action" model="ir.actions.act_window">
+        <field name="name">Add Emi Button</field>
+        <field name="res_model">add.emi.button.wizard</field>
+        <field name="view_mode">form</field>
+        <field name="view_id" ref="installement.add_emi_button_wizard_views_form" />
+        <field name="target">new</field>
+    </record>
+</odoo>