add reputation view and improve queries

app/helpers/wow_standings_helper.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module WowStandingsHelper
+  def reput_pourcentage(standing, tier)
+    max = tier.max_value
+    min = tier.min_value
+    value = standing.value
+
+    return 100 if max == min
+    return value * 100 / (max - min) if max.positive? && (min.positive? || min.zero?)
+    return value * -100 / (min - max) if min.negative? && (max.negative? || max.zero?)
+
+    0
+  end
+end