Encapsulate action stats

This gets rid of a bunch of instance variables in the view/controller
layer.

app/models/stats/actions.rb

@@ -0,0 +1,119 @@
+module Stats
+  class Actions
+
+    SECONDS_PER_DAY = 86400;
+
+    attr_reader :user
+    def initialize(user)
+      @user = user
+    end
+
+    def avg_ttc
+      @avg_ttc ||= (sum/count)/SECONDS_PER_DAY
+    end
+
+    def max_ttc
+      @max_ttc ||= max/SECONDS_PER_DAY
+    end
+
+    def min_ttc
+      @min_ttc ||= min/SECONDS_PER_DAY
+    end
+
+    def min_ttc_sec
+      min_ttc_sec = arbitrary_day + min # convert to a datetime
+      @actions_min_ttc_sec = (min_ttc_sec).strftime("%H:%M:%S")
+      @actions_min_ttc_sec = (min / SECONDS_PER_DAY).round.to_s + " days " + @actions_min_ttc_sec if min > SECONDS_PER_DAY
+      @actions_min_ttc_sec
+    end
+
+    def done_last30days
+      @done_last30days ||= done_since(one_month)
+    end
+
+    def done_last12months
+      @done_last12months ||= done_since(one_year)
+    end
+
+    def created_last30days
+      @sum_actions_created_last30days ||= new_since(one_month)
+    end
+
+    def created_last12months
+      @sum_actions_created_last12months ||= new_since(one_year)
+    end
+
+    def completion_charts
+      @completion_charts ||= %w{
+     actions_done_last30days_data
+     actions_done_last12months_data
+     actions_completion_time_data
+      }.map do |action|
+        Stats::Chart.new(action)
+      end
+    end
+
+    def timing_charts
+      @timing_charts ||= %w{
+      actions_visible_running_time_data
+      actions_running_time_data
+      actions_open_per_week_data
+      actions_day_of_week_all_data
+      actions_day_of_week_30days_data
+      actions_time_of_day_all_data
+      actions_time_of_day_30days_data
+      }.map do |action|
+        Stats::Chart.new(action)
+      end
+    end
+
+    private
+
+    def arbitrary_day
+      @arbitrary_day ||= Time.utc(2000,1,1,0,0)
+    end
+
+    def one_year
+      @one_year ||= 12.months.ago.beginning_of_day
+    end
+
+    def one_month
+      @one_month ||= 1.month.ago.beginning_of_day
+    end
+
+    def completed
+      @completed ||= user.todos.completed.select("completed_at, created_at")
+    end
+
+    def durations
+      @durations ||= completed.map do |r|
+        (r.completed_at - r.created_at)
+      end
+    end
+
+    def sum
+      @sum ||= durations.inject(0) {|sum, d| sum + d}
+    end
+
+    def min
+      @min ||= durations.min || 0
+    end
+
+    def max
+      @max ||= durations.max || 0
+    end
+
+    def count
+      completed.empty? ? 1 : completed.size
+    end
+
+    def new_since(cutoff)
+      user.todos.created_after(cutoff).count
+    end
+
+    def done_since(cutoff)
+      user.todos.completed.completed_after(cutoff).count
+    end
+
+  end
+end