[IMP] purchase: Add purchase history for PO line

Sometimes it's difficult to track the price of a product, with the
different discounts you can obtain.
Price of products might change often and it's very practical to track
the price at the moment of the order to verify that it's in line with
what you paid in the past.

Also hides the Forecast Report button when a new line is created (and
not yet saved) as the button is disabled anyway without any feedback).
New purchase history button will also hide at creation.

Task-2658786

closes odoo/odoo#78438

Signed-off-by: Tiffany Chang <tic@odoo.com>

addons/purchase/models/purchase.py

@@ -907,6 +907,7 @@ class PurchaseOrderLine(models.Model):
     partner_id = fields.Many2one('res.partner', related='order_id.partner_id', string='Partner', readonly=True, store=True)
     currency_id = fields.Many2one(related='order_id.currency_id', store=True, string='Currency', readonly=True)
     date_order = fields.Datetime(related='order_id.date_order', string='Order Date', readonly=True)
+    date_approve = fields.Datetime(related="order_id.date_approve", string='Confirmation Date', readonly=True)
     product_packaging_id = fields.Many2one('product.packaging', string='Packaging', domain="[('purchase', '=', True), ('product_id', '=', product_id)]", check_company=True)
     product_packaging_qty = fields.Float('Packaging Quantity')
 
@@ -1230,6 +1231,17 @@ class PurchaseOrderLine(models.Model):
             else:
                 line.product_uom_qty = line.product_qty
 
+    def action_purchase_history(self):
+        self.ensure_one()
+        action = self.env["ir.actions.actions"]._for_xml_id("purchase.action_purchase_history")
+        action['domain'] = [('state', 'in', ['purchase', 'done']), ('product_id', '=', self.product_id.id)]
+        action['display_name'] = _("Purchase History for %s", self.product_id.display_name)
+        action['context'] = {
+            'search_default_partner_id': self.partner_id.id
+        }
+
+        return action
+
     def _suggest_quantity(self):
         '''
         Suggest a minimal quantity based on the seller

addons/purchase/views/purchase_views.xml

@@ -250,6 +250,7 @@
                                     <field name="product_packaging_qty" attrs="{'invisible': ['|', ('product_id', '=', False), ('product_packaging_id', '=', False)]}" groups="product.group_stock_packaging" optional="show"/>
                                     <field name="product_packaging_id" attrs="{'invisible': [('product_id', '=', False)]}" context="{'default_product_id': product_id, 'tree_view_ref':'product.product_packaging_tree_view', 'form_view_ref':'product.product_packaging_form_view'}" groups="product.group_stock_packaging" optional="show"/>
                                     <field name="price_unit" attrs="{'readonly': [('qty_invoiced', '!=', 0)]}"/>
+                                    <button name="action_purchase_history" type="object" icon="fa-history" title="Purchase History" attrs="{'invisible': [('id', '=', False)]}"/>
                                     <field name="taxes_id" widget="many2many_tags" domain="[('type_tax_use','=','purchase'), ('company_id', '=', parent.company_id), ('country_id', '=', parent.tax_country_id)]" context="{'default_type_tax_use': 'purchase', 'search_view_ref': 'account.account_tax_view_search'}" options="{'no_create': True}" optional="show"/>
                                     <field name="price_subtotal" widget="monetary"/>
                                 </tree>
@@ -742,6 +743,32 @@
             </field>
         </record>
 
+    <record id="purchase_history_tree" model="ir.ui.view">
+        <field name="name">purchase.history.tree</field>
+        <field name="model">purchase.order.line</field>
+        <field name="arch" type="xml">
+            <tree create="false" default_order="order_id asc">
+                <field name="order_id" widget="many2one"/>
+                <field name="date_approve" widget="date"/>
+                <field name="partner_id"/>
+                <field name="product_uom_qty"/>
+                <field name="price_unit"/>
+            </tree>
+        </field>
+    </record>
+
+    <record id="action_purchase_history" model="ir.actions.act_window">
+        <field name="res_model">purchase.order.line</field>
+        <field name="view_mode">tree</field>
+        <field name="view_id" ref="purchase.purchase_history_tree"/>
+        <field name="context">{}</field>
+        <field name="help" type="html">
+            <p class="o_view_nocontent_smiling_face">
+                No purchase order were made for this product yet!
+            </p>
+        </field>
+    </record>
+
     <record id="action_purchase_batch_bills" model="ir.actions.server">
         <field name="name">Create Vendor Bills</field>
         <field name="model_id" ref="purchase.model_purchase_order"/>

addons/purchase_stock/views/purchase_views.xml

@@ -31,8 +31,8 @@
             </xpath>
             <xpath expr="//page/field[@name='order_line']/tree/field[@name='product_qty']" position="after">
                 <field name="forecasted_issue" invisible="1"/>
-                <button type="object" name="action_product_forecast_report" title="Forecast Report" icon="fa-area-chart" attrs="{'invisible': ['|', ('forecasted_issue', '=', False), ('product_type', '!=', 'product')]}" class="text-danger"/>
-                <button type="object" name="action_product_forecast_report" title="Forecast Report" icon="fa-area-chart" attrs="{'invisible': ['|', ('forecasted_issue', '=', True), ('product_type', '!=', 'product')]}"/>
+                <button type="object" name="action_product_forecast_report" title="Forecast Report" icon="fa-area-chart" attrs="{'invisible': ['|', '|', ('id', '=', False), ('forecasted_issue', '=', False), ('product_type', '!=', 'product')]}" class="text-danger"/>
+                <button type="object" name="action_product_forecast_report" title="Forecast Report" icon="fa-area-chart" attrs="{'invisible': ['|', '|', ('id', '=', False), ('forecasted_issue', '=', True), ('product_type', '!=', 'product')]}"/>
             </xpath>
             <xpath expr="//div[@name='date_planned_div']" position="inside">
                 <button name="%(action_purchase_vendor_delay_report)d" class="oe_link" type="action" context="{'search_default_partner_id': partner_id}" attrs="{'invisible': ['|', ('state', 'in', ['purchase', 'done']), ('partner_id', '=', False)]}">