Add "cost of doing epic" page. So far it gathers and processes the da…

…ta, but doesn't do any nice presentation. Part of #30

app/controllers/reports_controller.rb

@@ -170,4 +170,106 @@ def income_distribution
     @categories = @totals.keys
     @periods = periods_hash.keys.sort
   end
+
+  def cost_of_doing_epic
+    @title = "Cost of Doing Epic"
+
+    categories_hash = {}
+    exclusions = params[:exclusions] || []
+    ProductCategoryDescription.all.each do |pcd|
+      category = pcd.product_category.name
+      categories_hash[pcd.description] = category
+    end
+
+    begin
+      @start_date = Date.parse(params[:start_date])
+    rescue Exception
+      @start_date = Invoice.minimum(:date)
+    end
+    begin
+      @end_date = Date.parse(params[:end_date])
+    rescue Exception
+      @end_date = Date.today
+    end
+    @six_month_start_date = Date.today.prev_month.beginning_of_month.months_ago(5)
+    @six_month_end_date = Date.today.prev_month.end_of_month
+
+    @income_split = {}
+    @incomings = {}
+    @outgoings = {}
+    InvoiceItem.joins(:invoice).where(["`date` >= ? AND `date` < ?", @start_date, @end_date]).each do |item|
+      category_name = categories_hash[item.description]
+      if exclusions.include?(category_name)
+        next
+      end
+      if item.subtotal < 0
+        puts "Skipping "+item.inspect
+        next
+      end
+      puts "Unknown category: #{item.description} #{item.subtotal}"
+      if category_name.nil?
+        category_name = "Uncategorized"
+      end
+      if @income_split[category_name].nil?
+        @income_split[category_name] = 0.0
+      end
+      @income_split[category_name] += Float(item.subtotal)
+    end
+
+    # Find and categorise the expenses
+    BankAccountEntry.where(["`date` >= ? AND `date` < ?", @start_date, @end_date]).each do |item|
+      if item.entry_type.match?("Transfer.*Another Account")
+        next
+      end
+      if Float(item.gross_value) > 0
+        # Money in!
+        if @incomings[item.entry_type].nil?
+          @incomings[item.entry_type] = 0
+        end
+        puts item.inspect
+        @incomings[item.entry_type] += Float(item.gross_value)
+      else
+        if @outgoings[item.entry_type].nil?
+          @outgoings[item.entry_type] = 0
+        end
+        puts item.inspect
+        @outgoings[item.entry_type] += -1*Float(item.gross_value)
+      end
+    end
+
+    # Summarize and...
+    @total_incoming = @incomings.values.sum
+    @total_outgoing = @outgoings.values.sum
+    # ...roll the smaller items into an "other" category
+    other_incoming, wanted_incoming = @incomings.partition { |k, v| v < 100.00 } #@total_incoming/50 }
+    @incomings = wanted_incoming.to_h
+    @incomings["Other"] = other_incoming.to_h.values.sum unless other_incoming.empty?
+    other_outgoing, wanted_outgoing = @outgoings.partition { |k, v| v < 100.00 } #@total_outgoing/50 }
+    @outgoings = wanted_outgoing.to_h
+    @outgoings["Other"] = other_outgoing.to_h.values.sum unless other_outgoing.empty?
+    other_income_split, wanted_income_split = @income_split.partition { |k, v| v < @total_incoming/80 }
+    @income_split = wanted_income_split.to_h
+    @income_split["Other"] = 0
+    @income_split["Other"] += other_income_split.to_h.values.sum unless other_income_split.empty?
+    @income_split["Other"] += @income_split["Uncategorized"] unless @income_split["Uncategorized"].nil?
+    @income_split.delete("Uncategorized")
+
+    # Work out split of invoices based on categories in @income_split
+    @total_income_split = @income_split.values.sum
+    @processed_incomings = @income_split.transform_values do |value|
+        (value / @total_income_split) * @total_incoming
+    end
+    @total_processed_incoming = @processed_incomings.values.sum
+
+    # Convert them to a-month's-worth of values
+    one_month_multiplier = 31/(@end_date - @start_date).to_f
+    @monthly_incomings = @processed_incomings.transform_values { |v| v*one_month_multiplier }
+    @monthly_outgoings = @outgoings.transform_values { |v| v*one_month_multiplier }
+    @total_monthly_incoming = @monthly_incomings.values.sum
+    @total_monthly_outgoing = @monthly_outgoings.values.sum
+
+    # Draw a chart
+
+    @categories = @income_split.keys
+  end
 end

app/views/layouts/application.html.erb

@@ -13,6 +13,7 @@
       <li><%= link_to "Categories", { controller: "reports", action: "categories" } %>
       <li><%= link_to "Income Distribution", { controller: "reports", action: "income_distribution" } %>
       <li><%= link_to "Service Users", { controller: "reports", action: "service_users" } %>
+      <li><%= link_to "Cost of Doing Epic", { controller: "reports", action: "cost_of_doing_epic" } %>
     </ul>
     <%= yield %>
   </body>

app/views/reports/cost_of_doing_epic.erb

@@ -0,0 +1,96 @@
+<%= form_tag("", method: "get") do %>
+<%= label_tag :start_date, "Start date:" %>
+<%= text_field_tag :start_date, @start_date, size:12 %>
+<%= label_tag :end_date, "End date:" %>
+<%= text_field_tag :end_date, @end_date, size:12 %>
+<%= label_tag :stacked_percent, "Stacked as percent:" %>
+<%= check_box_tag :stacked_percent, "on", params[:stacked_percent] =='on' %>
+<%= label_tag :exclusions, "Exclude categories:" %>
+<%= select_tag :exclusions, options_for_select( ProductCategory.all.map { |c| c.name }, params[:exclusions]), {multiple: true, size: 5} %>
+<%= submit_tag "Show" %>
+<% end %>
+<%= form_tag("", method: "get") do %>
+<%= hidden_field_tag :start_date, @six_month_start_date %>
+<%= hidden_field_tag :end_date, @six_month_end_date %>
+<%= submit_tag "Last 6 Months" %>
+<% end %>
+<%= form_tag("", method: "get") do %>
+<%= hidden_field_tag :start_date, "" %>
+<%= hidden_field_tag :end_date,"" %>
+<%= submit_tag "All Time" %>
+<% end %>
+
+<h3>@income_split</h3>
+<ul>
+<% @income_split.each do |incoming| -%>
+<li><%= incoming -%></li>
+<% end -%>
+</ul>
+
+<h3>@incomings</h3>
+<ul>
+<% @incomings.each do |incoming| -%>
+<li><%= incoming -%></li>
+<% end -%>
+</ul>
+
+<h3>@outgoings</h3>
+<ul>
+<% @outgoings.each do |outgoing| -%>
+<li><%= outgoing -%></li>
+<% end -%>
+</ul>
+
+<h3>@processed_incomings</h3>
+<ul>
+<% @processed_incomings.each do |processed| -%>
+<li><%= processed -%></li>
+<% end -%>
+</ul>
+
+<p>total_income_split: <%= @total_income_split -%>,
+total_incoming: <%= @total_incoming -%>,
+total_processed_incoming: <%= @total_processed_incoming -%></p>
+
+<h3>@monthly_incomings - total: <%= @total_monthly_incoming -%></h3>
+<ul>
+<% @monthly_incomings.each do |item| -%>
+<li><%= item -%></li>
+<% end -%>
+</ul>
+
+<h3>@monthly_outgoings - total: <%= @total_monthly_outgoing -%></h3>
+<ul>
+<% @monthly_outgoings.each do |item| -%>
+<li><%= item -%></li>
+<% end -%>
+</ul>
+
+<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
+<script type="text/javascript">
+  google.charts.load('current', {'packages':['corechart']});
+  google.charts.setOnLoadCallback(function() {
+    drawTotalsBarChart()
+  });
+
+  function drawTotalsBarChart() {
+    var dataArray = [
+    ];
+    var data = google.visualization.arrayToDataTable(dataArray);
+
+    var options = {
+      isStacked: <%= raw (params[:stacked_percent] == 'on' ? 'percent' : true).to_json %>
+    };
+
+    var chart = new google.visualization.BarChart(document.getElementById('bar_chart'));
+    google.visualization.events.addListener(chart, 'ready', function () {
+      var link = document.getElementById('bar_chart_link')
+      link.href = chart.getImageURI()
+      link.style.visibility = "visible"
+    });
+
+    chart.draw(data, options);
+  }
+</script>
+<div id="bar_chart" style="width: 900px; height: 500px"></div>
+<a id="bar_chart_link" style="visibility: hidden;" href="">Download Chart</a>

config/routes.rb

@@ -3,4 +3,5 @@
   get "/reports/categories", to: "reports#categories"
   get "/reports/income_distribution", to: "reports#income_distribution"
   get "/reports/service_users", to: "reports#service_users"
+  get "/reports/cost_of_doing_epic", to: "reports#cost_of_doing_epic"
 end