[ADD] installment: created new module and add features

- Add setting section for installment
- Add wizard for Add EMI
- Add Button for document module redirect

installment/__init__.py

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+from . import models
+from . import wizard

installment/__manifest__.py

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+{
+    "name": "Installment",
+    "description": "Installment app",
+    "version": "0.1",
+    "category": "Sales/Sales",
+    "depends": ["base", "sale_subscription"],
+    "data": [
+        "security/ir.model.access.csv",
+        "wizard/add_emi_wizard.xml",
+        "views/installment_views.xml",
+        "views/res_config_settings_views.xml",
+        "views/installment_menuitem.xml",
+        "data/product_data.xml",
+    ],
+    "application": True,
+    "installable": True,
+    "license": "LGPL-3",
+}

installment/data/product_data.xml

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+<odoo>
+    <data noupdate="1">
+        <record id="product_installment" model="product.product">
+            <field name="name">Installment</field>
+            <field name="detailed_type">service</field>
+        </record>
+        <record id="product_monthly" model="product.product">
+            <field name="name">Monthly</field>
+            <field name="detailed_type">service</field>
+        </record>
+    </data>
+</odoo>

installment/models/__init__.py

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+from . import installment_installment
+from . import res_config_setting
+from . import sale_order

installment/models/installment_installment.py

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+from odoo import models, fields
+
+
+class Installment(models.Model):
+    _name = "installment.installment"

installment/models/res_config_setting.py

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+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = "res.config.settings"
+
+    max_duration = fields.Float(string="Max Duration", config_parameter = "installment.max_duration")
+    down_payment = fields.Integer(string="Down Payment Percentage", config_parameter = "installment.down_payment")
+    annual_rate = fields.Integer(string="Annual Rate Percentage", config_parameter = "installment.annual_rate")
+    administrative_expenses = fields.Integer(
+        string="Administrative Expenses Percentage", config_parameter = "installment.administrative_expenses"
+    )
+    delay_penalty_percentage = fields.Integer(string="Delay Penalty Percentage", config_parameter = "installment.delay_penalty_percentage")
+    delay_penalty_process = fields.Integer(string="Delay Penalty Process",config_parameter = "installment.delay_penalty_process")
+    nid = fields.Boolean(config_parameter = "installment.nid")
+    salary_components = fields.Boolean(string="Salary Components", config_parameter = "installment.salary_components")
+    bank_statement = fields.Boolean(string="Bank Statement", config_parameter = "installment.bank_statement")
+    bank_rate_letter = fields.Boolean(string="Bank Rate Letter", config_parameter = "installment.bank_rate_letter")
+    rental_contract = fields.Boolean(string="Rental Contract", config_parameter = "installment.rental_contract")
+    ownership_contract = fields.Boolean(string="Ownershp Contract", config_parameter = "installment.ownership_contract")

installment/models/sale_order.py

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+from odoo import models
+
+
+class SalesOrder(models.Model):
+    _name = "sale.order"
+    _inherit = "sale.order"
+
+    def action_upload_documents(self):
+        action = self.env["ir.actions.act_window"]._for_xml_id(
+            "documents.document_action"
+        )
+        return action

installment/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
+installment.access_installment_installment,access_installment_installment,installment.model_installment_installment,base.group_user,1,1,1,1
+installment.access_add_emi,access_add_emi,installment.model_add_emi,base.group_user,1,1,1,1

installment/views/installment_menuitem.xml

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+<odoo>
+    <menuitem id="installment_root_menu" name="Installment"/>
+    <menuitem id="subscription_menu" name="Subscriptions" parent="installment_root_menu" action="action_installment" />
+    <menuitem id="installment_config_menu" name="Configuration" parent="installment_root_menu" />
+    <menuitem id="installment_config_settings_menu" name="Settings" parent="installment_config_menu" action="action_installment_config_settings"/>
+</odoo>

installment/views/installment_views.xml

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+<odoo>
+    <record id="action_installment" model="ir.actions.act_window">
+        <field name="name">Installment</field>
+        <field name="res_model">installment.installment</field>
+        <field name="view_mode">tree,form</field>
+        <field name="help" type="html">
+            <p class="o_view_nocontent_smiling_face">
+                Create a new Installment
+            </p>
+        </field>
+    </record>
+
+    <record id="view_installment" model="ir.ui.view">
+        <field name="name">Subscription</field>
+        <field name="model">sale.order</field>
+        <field name="inherit_id" ref="sale_subscription.sale_subscription_order_view_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//div[@name='so_button_below_order_lines']/button" position="before">
+                <button name="installment.action_add_emi" class="btn btn-primary" invisible="state not in ['draft']" string="Add EMI" type="action"/>
+            </xpath>
+            <xpath expr="//div[hasclass('oe_button_box')]" position="inside">
+                <button name="action_upload_documents" class="btn btn-primary " icon="fa-file-text" string="Document" type="object"/>
+            </xpath>
+        </field>
+    </record>
+</odoo>

installment/views/res_config_settings_views.xml

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+<odoo>
+    <record id="res_config_settings_view_inherited_form" model="ir.ui.view">
+        <field name="name">res.config.settings.view.form</field>
+        <field name="model">res.config.settings</field>
+        <field name="inherit_id" ref="base.res_config_settings_view_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//form" position="inside">
+                <app string="Installment" data-string="Installment" name="installemnt Setting">
+                    <block title="Installment Process" name="installment_process">
+                        <setting string="Max Duration" help=" Define Max Duration">
+                            <field name="max_duration" style="width: 40%; min-width: 4rem;"/>
+                            <span> years</span>
+                        </setting>
+                        <setting string="Anual Rate Percentage" help="Define Annual Rate Percentage">
+                            <field name="annual_rate" style="width: 40%; min-width: 4rem;"/>
+                            <span> %Per Years</span>
+                        </setting>
+                        <setting string="Down Payment" help=" Define Down Payment Percentage">
+                            <field name="down_payment" style="width: 40%; min-width: 4rem;"/>
+                            <span> %From Product Price</span>
+                        </setting>
+                        <setting string="Administrative Expenses Percentage" help="Define Administrative Expense Percentage">
+                            <field name="administrative_expenses" style="width: 40%; min-width: 4rem;"/>
+                            <span>%From Amount After D.Payment</span>
+                        </setting>
+                        <setting string="Delay Penalty Percentage" help="Define Delay Penalty Percentage">
+                            <field name="delay_penalty_percentage" style="width: 40%; min-width: 4rem;"/>
+                            <span>%From Monthly Amount</span>
+                        </setting>
+                        <setting string="Delay Penalty Process" help="Define Delay Penalty Process">
+                            <field name="delay_penalty_process" style="width: 40%; min-width: 4rem;"/>
+                            <span>Days</span>
+                            <div class="text-muted">
+                                    Delay penalty percentqage will be applied after  exceed the delay process period
+                            </div>
+                        </setting>
+                    </block>
+                    <block title="Needed Documents" name="needed_document">
+                        <setting string="Nid">
+                            <field name="nid"/>
+                        </setting>
+                        <setting string="Salary Components">
+                            <field name="salary_components"/>
+                        </setting>
+                        <setting string="Bank Statement">
+                            <field name="bank_statement"/>
+                        </setting>
+                        <setting string="Bank Rate Letter">
+                            <field name="bank_rate_letter"/>
+                        </setting>
+                        <setting string="Rental Contract">
+                            <field name="rental_contract"/>
+                        </setting>
+                        <setting string="Ownership Contract">
+                            <field name="ownership_contract"/>
+                        </setting>
+                    </block>
+                </app>
+            </xpath>
+        </field>
+    </record>
+
+    <record id="action_installment_config_settings" model="ir.actions.act_window">
+        <field name="name">Settings</field>
+        <field name="res_model">res.config.settings</field>
+        <field name="view_id" ref="res_config_settings_view_inherited_form"/>
+        <field name="view_mode">form</field>
+    </record>
+</odoo>

installment/wizard/__init__.py

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+from . import add_emi

installment/wizard/add_emi.py

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+from odoo import models, fields, api, Command
+
+
+class AddEmi(models.TransientModel):
+    _name = "add.emi"
+    total_so_amount = fields.Float(readonly=True)
+    down_payment = fields.Float(readonly=True)
+    remaining_amount = fields.Float(readonly=True)
+    interest = fields.Float(readonly=True)
+    number_monthly_installment = fields.Integer(readonly=True)
+    installement_amount = fields.Float(readonly=True)
+
+    @api.model
+    def default_get(self, fields):
+        res = super().default_get(fields) or {}
+        active_id = self.env.context["active_id"]
+        sale_order = self.env["sale.order"].browse(active_id)
+        config_param = self.env["ir.config_parameter"]
+        max_duration = float(
+            config_param.get_param("installment.max_duration", default=0.0)
+        )
+        down_payment_percentage = int(
+            config_param.get_param("installment.down_payment", default=0)
+        )
+        annual_rate = float(
+            config_param.get_param("installment.annual_rate", default=0.0)
+        )
+
+        administrative_expenses = float(
+            config_param.get_param("installment.administrative_expenses", default=0.0)
+        )
+        # Total
+        total = sale_order.amount_total
+        # Down Payment calculated
+        down_payment_evaluate = (down_payment_percentage / 100) * total
+        # Administrative Expenses
+        remaining = total - down_payment_evaluate
+        adminstrative_expense = (administrative_expenses / 100) * remaining
+        total_remaining = remaining + adminstrative_expense
+        # Annually Interest
+        annuall_intrest = ((annual_rate / 100) * total_remaining) * max_duration
+        total_remaining += annuall_intrest
+        # Installment Amount
+        installment_ammount = (total_remaining) / (max_duration * 12)
+        # print(annuall_intrest)
+        res.update(
+            {
+                "total_so_amount": sale_order.amount_total,
+                "down_payment": down_payment_evaluate,
+                "remaining_amount": sale_order.amount_total - down_payment_evaluate,
+                "interest": annuall_intrest,
+                "number_monthly_installment": max_duration * 12,
+                "installement_amount": installment_ammount,
+            }
+        )
+        return res
+
+    def add_installment(self):
+        active_id = self.env.context["active_id"]
+        sale_order = self.env["sale.order"].browse(active_id)
+        sale_order.order_line = [
+            Command.create(
+                {
+                    "order_id": sale_order.id,
+                    "price_unit": self.installement_amount,
+                    "product_id": self.env.ref("installment.product_installment").id,
+                    "product_uom": self.env.ref("uom.product_uom_unit").id,
+                    "tax_id": None,
+                }
+            ),
+            Command.create(
+                {
+                    "order_id": sale_order.id,
+                    "product_uom_qty": 1.0,
+                    "price_unit": -self.installement_amount,
+                    "product_id": self.env.ref("installment.product_monthly").id,
+                    "product_uom": self.env.ref("uom.product_uom_unit").id,
+                    "tax_id": None,
+                },
+            ),
+        ]
+        return

installment/wizard/add_emi_wizard.xml

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+<odoo>
+    <record id='from_add_emi' model='ir.ui.view'>
+        <field name="name">Add EMI Form</field>
+        <field name="model">add.emi</field>
+        <field name="arch" type="xml">
+            <form>
+                <group>
+                    <field name="total_so_amount"/>
+                    <field name="down_payment"/>
+                    <field name="remaining_amount" readonly='1'/>
+                    <field name="interest" readonly='1'/>
+                    <field name="number_monthly_installment" readonly='1'/>
+                    <field name="installement_amount" readonly='1'/>
+                </group>
+                <footer>
+                    <button name="add_installment" class="btn btn-primary" string="Add Installment" type="object"/>
+                </footer>
+            </form>
+        </field>
+    </record>
+
+    <record id="action_add_emi" model="ir.actions.act_window">
+        <field name="name">Add EMI</field>
+        <field name="res_model">add.emi</field>
+        <field name="view_mode">form</field>
+        <field name="view_id" ref="from_add_emi" />
+        <field name="target">new</field>
+    </record>
+</odoo>