[IMP] custom_sale_purchase_display: enhance product listing

Improve product selection on Sale Orders, Purchase Orders

Before:
- Products in Sale Orders were displayed in default order, unrelated to customer
  history.
- No indication of the last invoice date on product cards.
- Forecasted and on-hand quantities were not visible at a glance.
- No visual indicator for differences in stock levels.
- Kanban product catalog in Purchase Orders didn't showed color tags

After:
- In Sale Orders, products already sold to the selected customer are prioritized
  and sorted from most recent to oldest invoice.
- Remaining products appear afterward in standard order.
- Product cards in catalog view now display the last invoice date
- Forecasted quantity and on-hand quantity are shown directly on product cards.
- Stock differences are highlighted: red for negative (-), green for
  positive (+).

Author: ksoz-odoo

custom_sale_purchase_display/__init__.py

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+from . import models

custom_sale_purchase_display/__manifest__.py

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+{
+    'name': 'Sale Order Product History',
+    'version': '1.0',
+    'category': 'Sales',
+    'depends': ['sale_management', 'stock', 'purchase'],
+    'data': [
+        'views/purchase_order_form.xml',
+        'views/product_template_kanban_catalog.xml',
+    ],
+    'installable': True,
+    'application': False,
+    'license': 'LGPL-3'
+}

custom_sale_purchase_display/models/__init__.py

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+from . import product_product
+from . import product_template

custom_sale_purchase_display/models/product_product.py

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+from odoo import models, fields, api
+
+
+class ProductProduct(models.Model):
+    _inherit = 'product.product'
+
+    last_invoice_date = fields.Date(
+        string="Last Invoice Date",
+        compute="_compute_last_invoice_data",
+        store=False
+    )
+    last_invoice_time_diff = fields.Char(
+        string="Last Invoice Time Diff",
+        compute="_compute_last_invoice_data",
+        store=False
+    )
+
+    def _compute_last_invoice_data(self):
+        for product in self:
+            partner_id = product.env.context.get('sale_order_partner_id') \
+                or product.env.context.get('purchase_order_partner_id')
+
+            is_sale = bool(product.env.context.get('sale_order_partner_id'))
+            move_type = 'out_invoice' if is_sale else 'in_invoice'
+
+            domain = [
+                ('state', '=', 'posted'),
+                ('invoice_date', '!=', False),
+                ('line_ids.product_id', '=', product.id),
+                ('move_type', '=', move_type),
+            ]
+            if partner_id:
+                domain.append(('partner_id', '=', partner_id))
+
+            move = product.env['account.move'].search(
+                domain, order='invoice_date desc', limit=1
+            )
+
+            product.last_invoice_date = move.invoice_date if move else False
+            product.last_invoice_time_diff = (
+                self._format_time_diff(move.invoice_date) if move else False
+            )
+
+    @api.model
+    def _get_recent_invoices(self, partner_id, is_sale=True):
+        if not partner_id:
+            return []
+
+        move_type = 'out_invoice' if is_sale else 'in_invoice'
+        moves = self.env['account.move'].search([
+            ('partner_id', '=', partner_id),
+            ('move_type', '=', move_type),
+            ('state', '=', 'posted'),
+            ('invoice_date', '!=', False)
+        ], order='invoice_date desc')
+
+        recent, seen = [], set()
+        for mv in moves:
+            for line in mv.line_ids.filtered('product_id'):
+                pid = line.product_id.id
+                if pid not in seen:
+                    recent.append({'pid': pid, 'date': mv.invoice_date})
+                    seen.add(pid)
+        return recent
+
+    @api.model
+    def _format_time_diff(self, invoice_date):
+        if not invoice_date:
+            return ""
+        days = (fields.Date.today() - invoice_date).days
+        if days > 365:
+            return f"{days // 365}y ago"
+        if days > 30:
+            return f"{days // 30}mo ago"
+        if days > 7:
+            return f"{days // 7}w ago"
+        if days > 0:
+            return f"{days}d ago"
+        return "today"

custom_sale_purchase_display/models/product_template.py

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+from odoo import models, fields, api
+
+
+class ProductTemplate(models.Model):
+    _inherit = 'product.template'
+
+    last_invoice_date = fields.Date(
+        string="Last Invoice Date",
+        related='product_variant_id.last_invoice_date',
+        store=False
+    )
+    last_invoice_time_diff = fields.Char(
+        string="Last Invoice Time Diff",
+        related='product_variant_id.last_invoice_time_diff',
+        store=False
+    )
+
+    product_variant_id = fields.Many2one(
+        'product.product',
+        compute='_compute_product_variant_id',
+        store=True,
+        index=True
+    )
+
+    @api.model
+    def name_search(self, name="", args=None, operator="ilike", limit=100):
+        args = args or []
+
+        partner_id = self.env.context.get('sale_order_partner_id') \
+            or self.env.context.get('purchase_order_partner_id')
+        if not partner_id:
+            return super().name_search(name, args, operator, limit)
+
+        is_sale = bool(self.env.context.get('sale_order_partner_id'))
+        recent_lines = self.env['product.product']._get_recent_invoices(
+            partner_id=partner_id,
+            is_sale=is_sale
+        )
+
+        if not recent_lines:
+            return super().name_search(name, args, operator, limit)
+
+        recent_template_ids = list(dict.fromkeys(
+            self.env['product.product'].browse(rl['pid']).product_tmpl_id.id
+            for rl in recent_lines
+        ))
+
+        base_domain = [('name', operator, name)] + args
+
+        recent_templates = self.search(
+            [('id', 'in', recent_template_ids)] + base_domain,
+            limit=limit
+        )
+        other_templates = self.search(
+            [('id', 'not in', recent_template_ids)] + base_domain,
+            limit=max(0, limit - len(recent_templates))
+        )
+
+        results = []
+        for tmpl_id in recent_template_ids:
+            tmpl = recent_templates.filtered(lambda t: t.id == tmpl_id)
+            if tmpl:
+                td = tmpl.last_invoice_time_diff
+                label = f"{tmpl.display_name} ⏱ {td}" if td else tmpl.display_name
+                results.append((tmpl.id, label))
+
+        results.extend((t.id, t.display_name) for t in other_templates)
+        return results

custom_sale_purchase_display/views/product_template_kanban_catalog.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="view_product_template_kanban_inherit" model="ir.ui.view">
+        <field name="name">product.product.kanban.inherit.catalog</field>
+        <field name="model">product.product</field>
+        <field name="inherit_id" ref="product.product_view_kanban_catalog"/>
+        <field name="arch" type="xml">
+            <xpath expr="//div[contains(@name, 'o_kanban_qty_available')]" position="inside">
+                <field name="virtual_available" invisible="1"/>
+                <field name="qty_available" invisible="1"/>  <!-- Ensure loaded -->
+                <field name="last_invoice_date" invisible="1"/>  <!-- Ensure loaded -->
+                <field name="last_invoice_time_diff" invisible="1"/>  <!-- Ensure loaded -->
+                <t t-set="diff" t-value="record.virtual_available.raw_value - record.qty_available.raw_value"/>
+                <t t-if="diff &gt; 0">
+                    <div style="color: green;">(+ <t t-esc="diff"/>)</div>
+                </t>
+                <t t-elif="diff &lt; 0">
+                    <div style="color: red;">(<t t-esc="diff"/>)</div>
+                </t>
+                <t t-else="">
+                    <div>(0)</div>
+                </t>
+                <!-- Display last invoice info -->
+                <div t-if="record.last_invoice_time_diff.value" style="font-size: 80%; color: #888;">
+                    ⏱ <t t-esc="record.last_invoice_time_diff.value"/>
+                </div>
+                <div t-if="record.last_invoice_date.value" style="font-size: 80%; color: #aaa;">
+                    📅 <t t-esc="record.last_invoice_date.value"/>
+                </div>
+            </xpath>
+        </field>
+    </record>
+</odoo>

custom_sale_purchase_display/views/purchase_order_form.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="view_order_form_inherit_custom" model="ir.ui.view">
+        <field name="name">purchase.order.form.inherit.custom</field>
+        <field name="model">purchase.order</field>
+        <field name="inherit_id" ref="purchase.purchase_order_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='order_line']/list/field[@name='product_id']" position="attributes">
+                <attribute name="context">{'purchase_order_partner_id': parent.partner_id}</attribute>
+            </xpath>
+        </field>
+    </record>
+</odoo>