make product redistribution work!

app/assets/stylesheets/bootstrap_and_overrides.css.less

@@ -253,6 +253,11 @@ tr.unavailable {
   height: inherit;
 }
 
+// inline form elements
+.inline {
+  display: inline;
+}
+
 // show package icon after amount of package numbers
 .package {
   background: url(package-bg.png) no-repeat right center;

app/controllers/finance/receive_controller.rb

@@ -6,19 +6,38 @@ class Finance::ReceiveController < Finance::BaseController
   end
 
   def update
+    # where to leave remainder during redistribution
+    rest_to = []
+    rest_to << :tolerance if params[:rest_to_tolerance]
+    rest_to << :stock if params[:rest_to_stock]
+    rest_to << nil
+    # count what happens to the articles
+    counts = [0] * (rest_to.length+2)
+    cunits = [0] * (rest_to.length+2)
     OrderArticle.transaction do
       params[:order_articles].each do |oa_id, oa_params|
         unless oa_params.blank?
           oa = OrderArticle.find(oa_id)
-          # update attributes
-          oa.update_attributes!(oa_params)
-          # and process consequences
-          oa.redistribute(oa.units_received * oa.price.unit_quantity) unless oa.units_received.blank?
+          # update attributes; don't use update_attribute because it calls save
+          # which makes received_changed? not work anymore
+          oa.attributes = oa_params
+          counts[0] += 1 if oa.units_received_changed?
+          cunits[0] += oa.units_received * oa.article.unit_quantity
+          unless oa.units_received.blank?
+            oacounts = oa.redistribute oa.units_received * oa.price.unit_quantity, rest_to
+            oacounts.each_with_index {|c,i| cunits[i+1]+=c; counts[i+1]+=1 if c>0 }
+          end
           oa.save!
         end
       end
 
-      flash[:notice] = I18n.t('finance.receive.update.notice')
+      #flash[:notice] = I18n.t('finance.receive.update.notice')
+      notice = "Order received:"
+      notice += " #{counts.shift} articles (#{cunits.shift} units) updated"
+      notice += ", #{counts.shift} (#{cunits.shift}) using tolerance" if params[:rest_to_tolerance]
+      notice += ", #{counts.shift} (#{cunits.shift}) go to stock if foodsoft would support that" if params[:rest_to_stock]
+      notice += ", #{counts.shift} (#{cunits.shift}) left over"
+      flash[:notice] = notice
       redirect_to finance_order_index_path
     end
   end

app/models/order_article.rb

@@ -102,16 +102,50 @@ class OrderArticle < ActiveRecord::Base
     (units_to_order * price.unit_quantity) == group_orders_sum[:quantity] rescue false
   end
 
-  def redistribute(quantity)
-    # recompute
-    group_order_articles.each {|goa| goa.save_results! quantity }
+  # redistribute articles over ordergroups
+  #   quantity       Number of units to distribute
+  #   surplus        What to do when there are more articles than ordered quantity
+  #                    :tolerance   fill member orders' tolerance
+  #                    :stock       move to stock
+  #                    nil          nothing; for catching the remaining count
+  #   update_totals  Whether to update group_order and ordergroup totals
+  # returns array with counts for each surplus method
+  def redistribute(quantity, surplus = [:tolerance], update_totals = true)
+    qty_left = quantity
+    counts = [0] * surplus.length
+
+    if surplus.index(:tolerance).nil?
+      qty_for_members = [qty_left, self.quantity].min
+    else
+      qty_for_members = [qty_left, self.quantity+self.tolerance].min
+      counts[surplus.index(:tolerance)] = [0, qty_for_members-self.quantity].max
+    end
+
+    # Recompute
+    group_order_articles.each {|goa| goa.save_results! qty_for_members }
+    qty_left -= qty_for_members
+
+    # if there's anything left, move to stock if wanted
+    if qty_left > 0 and surplus.index(:stock)
+      counts[surplus.index(:stock)] = qty_left
+      # 1) find existing stock article with same name, unit, price
+      # 2) if not found, create new stock article
+      #      avoiding duplicate stock article names
+    end
+    if qty_left > 0 and surplus.index(nil)
+      counts[surplus.index(nil)] = qty_left
+    end
 
     # Update GroupOrder prices & Ordergroup stats
     # TODO only affected group_orders, and once after redistributing all articles
-    order.group_orders.each(&:update_price!)
-    order.ordergroups.each(&:update_stats!)
+    if update_totals
+      update_ordergroup_prices
+      order.ordergroups.each(&:update_stats!)
+    end
 
     # TODO notifications
+
+    counts
   end
 
   # Updates order_article and belongings during balancing process
@@ -173,7 +207,7 @@ class OrderArticle < ActiveRecord::Base
     # updates prices of ALL ordergroups - these are actually too many
     # in case of performance issues, update only ordergroups, which ordered this article
     # CAUTION: in after_destroy callback related records (e.g. group_order_articles) are already non-existent
-    order.group_orders.each { |go| go.update_price! }
+    order.group_orders.each(&:update_price!)
   end
 
 end

app/views/finance/receive/edit.html.haml

@@ -3,8 +3,21 @@
 = form_tag(finance_receive_path(@order), :method => :put) do
   %section#results
     = render 'edit_articles'
+
   .form-actions
-    = submit_tag t('.submit'), class: 'btn btn-primary'
-    = link_to t('ui.or_cancel'), finance_order_index_path
+    .pull-left
+      Surplus to
+      = label_tag :rest_to_tolerance, class: 'inline' do
+        = check_box_tag :rest_to_tolerance, 1, true
+        member tolerance,
+      %span{style: 'color: grey'}
+        and
+        = label_tag :rest_to_stock, class: 'inline' do
+          = check_box_tag :rest_to_stock, 1, false, disabled: true
+          stock
+
+    .pull-right
+      = submit_tag t('.submit'), class: 'btn btn-primary'
+      = link_to t('ui.or_cancel'), finance_order_index_path
 
 %p= link_to_top

spec/models/order_article_spec.rb

@@ -67,21 +67,21 @@ describe OrderArticle do
 
     it 'does nothing when nothing has changed' do
       set_quantities [3,2], [1,3], [1,0]
-      oa.redistribute 6
+      expect(oa.redistribute 6, [:tolerance, nil]).to eq [1, 0]
       goa_reload
       expect([goa1, goa2, goa3].map(&:result).map(&:to_i)).to eq [4, 1, 1]
     end
 
     it 'works when there is nothing to distribute' do
       set_quantities [3,2], [1,3], [1,0]
-      oa.redistribute 0
+      expect(oa.redistribute 0, [:tolerance, nil]).to eq [0, 0]
       goa_reload
       expect([goa1, goa2, goa3].map(&:result)).to eq [0, 0, 0]
     end
 
     it 'works when quantity needs to be reduced' do
       set_quantities [3,2], [1,3], [1,0]
-      oa.redistribute 4
+      expect(oa.redistribute 4, [:tolerance, nil]).to eq [0, 0]
       goa_reload
       expect([goa1, goa2, goa3].map(&:result)).to eq [3, 1, 0]
     end
@@ -89,18 +89,32 @@ describe OrderArticle do
     it 'works when quantity is increased within quantity' do
       set_quantities [3,0], [2,0], [2,0]
       expect([goa1, goa2, goa3].map(&:result)).to eq [3, 2, 1]
-      oa.redistribute 7
+      expect(oa.redistribute 7, [:tolerance, nil]).to eq [0, 0]
       goa_reload
       expect([goa1, goa2, goa3].map(&:result).map(&:to_i)).to eq [3, 2, 2]
     end
 
     it 'works when there is just one for the first' do
       set_quantities [3,2], [1,3], [1,0]
-      oa.redistribute 1
+      expect(oa.redistribute 1, [:tolerance, nil]).to eq [0, 0]
       goa_reload
       expect([goa1, goa2, goa3].map(&:result)).to eq [1, 0, 0]
     end
 
+    it 'works when there is tolerance and left-over' do
+      set_quantities [3,2], [1,1], [1,0]
+      expect(oa.redistribute 10, [:tolerance, nil]).to eq [3, 2]
+      goa_reload
+      expect([goa1, goa2, goa3].map(&:result)).to eq [5, 2, 1]
+    end
+
+    it 'works when redistributing without tolerance' do
+      set_quantities [3,2], [1,3], [1,0]
+      expect(oa.redistribute 8, [nil]).to eq [3]
+      goa_reload
+      expect([goa1, goa2, goa3].map(&:result)).to eq [3, 1, 1]
+    end
+
   end
 
 end