finder and it's specs work!

lib/redistat/finder.rb

@@ -1,5 +1,6 @@
 module Redistat
   class Finder
+    include Database
     
     attr_reader :options
     
@@ -7,16 +8,64 @@ module Redistat
       @options = options
     end
     
-    def builder
-      
-    end
-    
     def valid_options?
       return true if !@options[:scope].blank? && !@options[:label].blank? && !@options[:from].blank? && !@options[:till].blank?
       false
     end
     
+    def find(options = {})
+      @options.merge!(options)
+      return nil if !valid_options?
+      sets = Finder::DateSet.new(@options[:from], @options[:till], @options[:depth], @options[:interval])
+      key = Key.new(@options[:scope], @options[:label])
+      sum = {}
+      sets.each do |set|
+        set_sum = summarize_add_keys(set[:add], key, {})
+        set_sum = summarize_sub_keys(set[:sub], key, set_sum)
+        set_sum.each do |k, v|
+          if sum.has_key?(k)
+            sum[k] += v.to_i
+          else
+            sum[k] = v.to_i
+          end
+        end
+      end
+      sum
+    end
+    
+    def summarize_add_keys(the_sets, key, sum)
+      the_sets.each do |date|
+        stat = db.hgetall("#{key.prefix}#{date}")
+        stat.each do |k, v|
+          if sum.has_key?(k)
+            sum[k] += v.to_i
+          else
+            sum[k] = v.to_i
+          end
+        end
+      end
+      sum
+    end
+    
+    def summarize_sub_keys(the_sets, key, sum)
+      the_sets.each do |date|
+        stat = db.hgetall("#{key.prefix}#{date}")
+        stat.each do |k, v|
+          if sum.has_key?(k)
+            sum[k] -= v.to_i
+          else
+            sum[k] = -v.to_i
+          end
+        end
+      end
+      sum
+    end
+    
     class << self
+    
+      def find(*args)
+        new.find(*args)
+      end
       
       def scope(scope)
         new.scope(scope)