WIP: Add "Beginning Cash Balance" to total contributions

Author: tdooner

calculators/total_contributions_calculator.rb

@@ -46,10 +46,39 @@ def fetch
       contributions_by_filer_id[filer_id] += result['Total'].to_f
     end
 
+    # For candidates where we specify a "Start Date", we include their initial
+    # "Beginning Cash Balance" as a contribution so that our calculation of
+    # their remaining balance matches up with their actual reported balance.
+    starting_balances_by_filer_id.each do |filer_id, result|
+      contributions_by_filer_id[filer_id] ||= 0
+      contributions_by_filer_id[filer_id] += result['Starting_Balance'].to_f
+    end
+
     contributions_by_filer_id.each do |filer_id, total_contributions|
       candidate = @candidates_by_filer_id[filer_id]
       candidate.save_calculation(:total_contributions, total_contributions)
     end
   end
+
+  def starting_balances_by_filer_id
+    ActiveRecord::Base.connection.execute(<<-SQL).index_by { |r| r['Filer_ID'] }
+      WITH first_filing_after_start_dates AS (
+        -- Get the first report after the Start Date for each filer
+        SELECT "Filer_ID", MIN("Thru_Date") as "Thru_Date"
+        FROM "Summary", candidates
+        WHERE "Filer_ID" = "FPPC"::varchar
+        AND "Start_Date" IS NOT NULL
+        AND "Thru_Date" >= "Start_Date"
+        GROUP BY "Filer_ID"
+      )
+      SELECT "Summary"."Filer_ID", "Summary"."Thru_Date", "Amount_A" as "Starting_Balance"
+      FROM "Summary"
+      INNER JOIN first_filing_after_start_dates
+        ON first_filing_after_start_dates."Filer_ID" = "Summary"."Filer_ID"
+        AND first_filing_after_start_dates."Thru_Date" = "Summary"."Thru_Date"
+      WHERE "Form_Type" = 'F460'
+      AND "Line_Item" = '12';
+    SQL
+  end
 end