FEATURE: Hide Reviewable scores, change score filter to Priority

We found score hard to understand. It is still there behind the scenes
for sorting purposes, but it is no longer shown.

You can now filter by minimum priority (low, med, high) instead of
score.

spec/jobs/notify_reviewable_spec.rb

@@ -65,7 +65,8 @@ describe Jobs::NotifyReviewable do
 
     it "respects visibility" do
       SiteSetting.enable_category_group_review = true
-      SiteSetting.min_score_default_visibility = 2.0
+      Reviewable.set_priorities(medium: 2.0)
+      SiteSetting.reviewable_default_visibility = 'medium'
 
       GroupUser.create!(group_id: group.id, user_id: moderator.id)
 

spec/jobs/pending_reviewables_reminder_spec.rb

@@ -56,19 +56,21 @@ describe Jobs::PendingReviewablesReminder do
       expect(execute.sent_reminder).to eq(true)
     end
 
-    context "min_score_default_visibility" do
+    context "reviewable_default_visibility" do
       before do
         create_flag(49.hours.ago)
         create_flag(51.hours.ago)
       end
 
-      it "doesn't send a message when min_score_default_visibility is not met" do
-        SiteSetting.min_score_default_visibility = 3.0
+      it "doesn't send a message when `reviewable_default_visibility` is not met" do
+        Reviewable.set_priorities(medium: 3.0)
+        SiteSetting.reviewable_default_visibility = 'medium'
         expect(execute.sent_reminder).to eq(false)
       end
 
-      it "sends a message when min_score_default_visibility is met" do
-        SiteSetting.min_score_default_visibility = 2.0
+      it "sends a message when `reviewable_default_visibility` is met" do
+        Reviewable.set_priorities(medium: 2.0)
+        SiteSetting.reviewable_default_visibility = 'medium'
         expect(execute.sent_reminder).to eq(true)
       end
     end

spec/jobs/reviewable_priorities_spec.rb

@@ -0,0 +1,21 @@
+require 'rails_helper'
+
+describe Jobs::ReviewablePriorities do
+
+  it "will set priorities based on the maximum score" do
+    (1..6).each { |i| Fabricate(:reviewable, score: i) }
+    Jobs::ReviewablePriorities.new.execute({})
+
+    expect(Reviewable.min_score_for_priority('low')).to eq(0.0)
+    expect(Reviewable.min_score_for_priority('medium')).to eq(3.0)
+    expect(Reviewable.min_score_for_priority('high')).to eq(5.0)
+  end
+
+  it "will return 0 if no reviewables exist" do
+    Jobs::ReviewablePriorities.new.execute({})
+
+    expect(Reviewable.min_score_for_priority('low')).to eq(0.0)
+    expect(Reviewable.min_score_for_priority('medium')).to eq(0.0)
+    expect(Reviewable.min_score_for_priority('high')).to eq(0.0)
+  end
+end