[ADD] estate: a new module to manage estate properties

estate/__init__.py

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+from . import models

estate/__manifest__.py

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+{
+    'name': "Real Estate",
+    'description': "Create real estate properties and keep track of status",
+    'depends': [
+        'base',
+    ],
+    'data': [
+        'security/ir.model.access.csv',
+        'views/estate_menus.xml',
+        'views/estate_property_views.xml',
+        'views/estate_property_types_views.xml',
+        'views/estate_property_tag_views.xml',
+        'views/estate_property_offer_views.xml',
+        'views/users.xml',
+    ],
+    'license': "LGPL-3",
+    # data files containing optionally loaded demonstration data
+    'demo': [
+        "demo/demo.xml",
+    ],
+}

estate/demo/demo.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <data>
+        <record id="model_estate_property_action_cancel" model="ir.actions.server">
+            <field name="name">Mass cancel</field>
+            <field name="model_id" ref="estate.model_estate_property"/>
+            <field name="binding_model_id" ref="estate.model_estate_property"/>
+            <field name="binding_view_types">list</field>
+            <field name="state">code</field>
+            <field name="code">action = records.action_cancel()</field>
+        </record>
+    </data>
+</odoo>

estate/models/__init__.py

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+from . import estate_property, estate_property_type, estate_property_tag, estate_property_offer, users

estate/models/estate_property.py

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+from dateutil.relativedelta import relativedelta
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError
+from odoo.tools import float_compare
+
+
+class EstateProperty(models.Model):
+    _name = 'estate.property'
+    _description = 'Create real estate properties and keep track of status'
+    _order = 'id desc'
+
+    name = fields.Char(string="Name", required=True)
+    description = fields.Text(string="Description")
+    postcode = fields.Char(string="Postcode")
+    date_availability = fields.Date(string="Date Availability", default=lambda self: fields.Datetime.today() + relativedelta(months=3), copy=False)
+    expected_price = fields.Float(string="Expected Price", required=True)
+    selling_price = fields.Float(string="Selling Price", readonly=True, copy=False)
+    bedrooms = fields.Integer(string="Bedrooms", default=2)
+    living_area = fields.Integer(string="Living Area")
+    facades = fields.Integer(string="Facades")
+    garage = fields.Boolean(string="Garage")
+    garden = fields.Boolean(string="Garden")
+    garden_area = fields.Integer(string="Garden Area")
+    garden_orientation = fields.Selection(
+        string="Garden Orientation",
+        selection=[('north', "North"), ('south', "South"), ('east', "East"), ('west', "West")]
+    )
+    active = fields.Boolean(string="Active", default=True)
+    state = fields.Selection(
+        string="State",
+        default='new',
+        selection=[
+            ('new', "New"),
+            ('offer_received', "Offer Received"),
+            ('offer_accepted', "Offer Accepted"),
+            ('sold', "Sold"),
+            ('cancelled', "Cancelled")
+        ]
+    )
+    property_type_id = fields.Many2one('estate.property.types', string="Property Type")
+    salesman_id = fields.Many2one('res.users', string="Salesman", default=lambda self: self.env.user)
+    buyer_id = fields.Many2one('res.partner', string="Buyer")
+    tag_ids = fields.Many2many('estate.property.tag', string="Property Tags")
+    offer_ids = fields.One2many('estate.property.offer', 'property_id', string="Offers")
+    total_area = fields.Float(compute="_compute_total_area", string="Total Area")
+    best_price = fields.Float(compute="_compute_best_price", string="Best Price")
+
+    _sql_constraints = [
+        ('check_expected_price', 'CHECK(expected_price > 0)',
+         "The expected price should be greater than 0."),
+        ('check_selling_price', 'CHECK(buyer_id IS NULL OR selling_price > 0)',
+         "The selling price should be greater than 0."),
+    ]
+
+    @api.constrains('selling_price', 'expected_price')
+    def _check_prices_difference(self):
+        for record in self:
+            if record.buyer_id and float_compare(record.selling_price, 0.9 * record.expected_price, 5) == -1:
+                raise UserError(_("Selling price cannot be lower than 90% of the expected price!"))
+
+    @api.depends('garden_area', 'living_area')
+    def _compute_total_area(self):
+        for record in self:
+            record.total_area = record.garden_area + record.living_area
+
+    @api.depends('offer_ids.price')
+    def _compute_best_price(self):
+        for record in self:
+            prices = record.offer_ids.mapped('price')
+
+            record.best_price = max(prices) if len(prices) > 0 else 0
+
+    @api.onchange('garden')
+    def _onchange_garden(self):
+        if self.garden:
+            self.garden_area = 10
+            self.garden_orientation = 'north'
+        else:
+            self.garden_area = 0
+            self.garden_orientation = ''
+
+    def action_cancel(self):
+        for record in self:
+            if record.state == 'cancelled':
+                raise UserError(_("Property already cancelled!"))
+            elif record.state == 'sold':
+                raise UserError(_("A sold property cannot be cancelled!"))
+            else:
+                self.state = 'cancelled'
+
+        return True
+
+    def action_sold(self):
+        for record in self:
+            if record.state == 'sold':
+                raise UserError(_("Property already sold!"))
+            elif record.state == 'cancelled':
+                raise UserError(_("A cancelled property cannot be sold!"))
+            else:
+                self.state = 'sold'
+
+        return True
+
+    @api.ondelete(at_uninstall=False)
+    def prevent_deletion(self):
+        for record in self:
+            if record.state != 'new' and record.state != 'cancelled':
+                raise UserError(_("You can only delete new or cancelled properties!"))

estate/models/estate_property_offer.py

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+from datetime import timedelta
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError
+from odoo.tools import float_compare
+
+
+class EstatePropertyOffer(models.Model):
+    _name = 'estate.property.offer'
+    _description = 'Model representing the offers from partners to a specific property'
+    _order = 'price desc'
+
+    price = fields.Float(string="Price")
+    status = fields.Selection(
+        string="Status",
+        copy=False,
+        selection=[
+            ('accepted', "Accepted"),
+            ('refused', "Refused")
+        ]
+    )
+    partner_id = fields.Many2one('res.partner', string="Partner", required=True)
+    property_id = fields.Many2one('estate.property', string="Property", required=True)
+    validity = fields.Integer(string="Validity", default=7)
+    date_deadline = fields.Date(compute='_compute_date_deadline', inverse='_inverse_date_deadline', string="Date Deadline")
+    create_date = fields.Date(default=lambda self: fields.Datetime.now())
+    property_type_id = fields.Many2one(related="property_id.property_type_id")
+
+    _sql_constraints = [
+        ('check_offer_price', 'CHECK(price > 0)',
+         "The offer price should be greater than 0."),
+    ]
+
+    @api.depends('validity', 'create_date')
+    def _compute_date_deadline(self):
+        for record in self:
+            record.date_deadline = record.create_date + timedelta(days=record.validity)
+
+    def _inverse_date_deadline(self):
+        for record in self:
+            delta = record.date_deadline - record.create_date
+
+            record.validity = delta.days
+
+    def action_confirm(self):
+        self.ensure_one()
+
+        if self.status == 'accepted':
+            raise UserError(_("Offer already accepted!"))
+        elif self.status == 'refused':
+            raise UserError(_("Can't accept a refused offer!"))
+        elif self.property_id.buyer_id:
+            raise UserError(_("Can't accept more than 1 offer!"))
+        else:
+            if float_compare(self.price, 0.9 * self.property_id.expected_price, 5) == -1:
+                raise UserError(_("Selling price cannot be lower than 90% of the expected price!"))
+
+            self.status = 'accepted'
+            self.property_id.state = 'offer_accepted'
+            self.property_id.selling_price = self.price
+            self.property_id.buyer_id = self.partner_id
+
+        return True
+
+    def action_refuse(self):
+        for record in self:
+            if record.status == 'refused':
+                raise UserError(_("Offer already refused!"))
+            elif record.status == 'accepted':
+                raise UserError(_("Can't refuse an accepted offer!"))
+            else:
+                record.status = 'refused'
+
+        return True
+
+    @api.model_create_multi
+    def create(self, vals):
+        for val in vals:
+            current_property_id = self.env['estate.property'].browse(val['property_id'])
+
+            if current_property_id.best_price > val['price']:
+                raise UserError(_("Can't create an offer with a price lower than the best offer!"))
+
+            current_property_id.state = 'offer_received'
+
+        return super().create(vals)