From 0e4b33be96174c15e04e5829bbc2dc7154d319b5 Mon Sep 17 00:00:00 2001
From: Lance Edgar <lance@edbob.org>
Date: Thu, 16 Jan 2020 11:56:33 -0600
Subject: [PATCH] Add "cost history" dialog for product view

older jquery theme only, for now
---
 tailbone/templates/products/view.mako | 35 +++++++++++++-
 tailbone/views/products.py            | 70 +++++++++++++++++++++++++++
 2 files changed, 103 insertions(+), 2 deletions(-)

diff --git a/tailbone/templates/products/view.mako b/tailbone/templates/products/view.mako
index 35095a1d..1c36c63c 100644
--- a/tailbone/templates/products/view.mako
+++ b/tailbone/templates/products/view.mako
@@ -10,7 +10,25 @@
             var dialog = $('#' + typ + '-price-history-dialog');
             dialog.dialog({
                 title: typ[0].toUpperCase() + typ.slice(1) + " Price History",
-                width: 500,
+                width: 600,
+                height: 300,
+                modal: true,
+                buttons: [
+                    {
+                        text: "Close",
+                        click: function() {
+                            dialog.dialog('close');
+                        }
+                    }
+                ]
+            });
+        }
+
+        function showCostHistory() {
+            var dialog = $('#cost-history-dialog');
+            dialog.dialog({
+                title: "Cost History",
+                width: 600,
                 height: 300,
                 modal: true,
                 buttons: [
@@ -41,6 +59,11 @@
                 return false;
             });
 
+            $('#view-cost-history').on('click', function() {
+                showCostHistory();
+                return false;
+            });
+
         });
 
       </script>
@@ -286,7 +309,12 @@
       </nav>
   % else:
   <div class="panel-grid" id="product-costs">
-    <h2>Vendor Sources</h2>
+    <h2>
+      Vendor Sources
+      % if request.rattail_config.versioning_enabled() and master.has_perm('versions'):
+          <a id="view-cost-history" href="#">(view cost history)</a>
+      % endif
+    </h2>
     ${self.sources_grid()}
   </div>
   % endif
@@ -405,6 +433,9 @@
           <div class="price-history-dialog" id="suggested-price-history-dialog">
             ${suggested_price_history_grid.render_grid()|n}
           </div>
+          <div class="price-history-dialog" id="cost-history-dialog">
+            ${cost_history_grid.render_grid()|n}
+          </div>
       % endif
   % endif
 
diff --git a/tailbone/views/products.py b/tailbone/views/products.py
index 3ce27e87..14e17247 100644
--- a/tailbone/views/products.py
+++ b/tailbone/views/products.py
@@ -1030,6 +1030,24 @@ class ProductsView(MasterView):
             grid.set_type('changed', 'datetime')
             kwargs['suggested_price_history_grid'] = grid
 
+            # cost history
+            data = self.get_cost_history(product)
+            grid = grids.Grid('products.cost_history', data,
+                              request=self.request,
+                              columns=[
+                                  'cost',
+                                  'vendor',
+                                  'since',
+                                  'changed',
+                                  'changed_by',
+                              ],
+                              labels={
+                                  'price_type': "Type",
+                              })
+            grid.set_type('cost', 'currency')
+            grid.set_type('changed', 'datetime')
+            kwargs['cost_history_grid'] = grid
+
         kwargs['costs_label_preferred'] = "Pref."
         kwargs['costs_label_vendor'] = "Vendor"
         kwargs['costs_label_code'] = "Order Code"
@@ -1289,6 +1307,58 @@ class ProductsView(MasterView):
 
         return list(final_history.values())
 
+    def get_cost_history(self, product):
+        """
+        Returns a sequence of "records" which corresponds to the given
+        product's cost history.
+        """
+        Transaction = continuum.transaction_class(model.Product)
+        ProductVersion = continuum.version_class(model.Product)
+        ProductCostVersion = continuum.version_class(model.ProductCost)
+        now = make_utc()
+        history = []
+
+        # we just find all relevant (preferred!) ProductCostVersion records
+        versions = self.Session.query(ProductCostVersion)\
+                               .join(Transaction,
+                                     Transaction.id == ProductCostVersion.transaction_id)\
+                               .filter(ProductCostVersion.product_uuid == product.uuid)\
+                               .filter(ProductCostVersion.preference == 1)\
+                               .order_by(Transaction.issued_at,
+                                         Transaction.id)\
+                               .all()
+
+        last_cost = None
+        last_vendor_uuid = None
+        for version in versions:
+
+            changed = False
+            if version.unit_cost != last_cost:
+                changed = True
+            elif version.vendor_uuid != last_vendor_uuid:
+                changed = True
+
+            if changed:
+                changed = version.transaction.issued_at
+                history.append({
+                    'transaction_id': version.transaction.id,
+                    'cost': version.unit_cost,
+                    'vendor': version.vendor.name,
+                    'since': humanize.naturaltime(now - changed),
+                    'changed': changed,
+                    'changed_by': version.transaction.user,
+                })
+
+            last_cost = version.unit_cost
+            last_vendor_uuid = version.vendor_uuid
+
+        final_history = OrderedDict()
+        for hist in sorted(history, key=lambda h: h['changed'], reverse=True):
+            if hist['transaction_id'] not in final_history:
+                final_history[hist['transaction_id']] = hist
+
+        return list(final_history.values())
+
     def edit(self):
         # TODO: Should add some more/better hooks, so don't have to duplicate
         # so much code here.