1 files changed, 59 insertions, 0 deletions
diff --git a/app/lib/admin/metrics/measure/instance_followers_measure.rb b/app/lib/admin/metrics/measure/instance_followers_measure.rb
new file mode 100644
index 000000000..caa60013b
--- /dev/null
+++ b/app/lib/admin/metrics/measure/instance_followers_measure.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Measure::InstanceFollowersMeasure < Admin::Metrics::Measure::BaseMeasure
+  def self.with_params?
+    true
+  end
+
+  def key
+    'instance_followers'
+  end
+
+  def total_in_time_range?
+    false
+  end
+
+  protected
+
+  def perform_total_query
+    Follow.joins(:account).merge(Account.where(domain: params[:domain])).count
+  end
+
+  def perform_previous_total_query
+    nil
+  end
+
+  def perform_data_query
+    sql = <<-SQL.squish
+      SELECT axis.*, (
+        WITH new_followers AS (
+          SELECT follows.id
+          FROM follows
+          INNER JOIN accounts ON follows.account_id = accounts.id
+          WHERE date_trunc('day', follows.created_at)::date = axis.period
+            AND accounts.domain = $3::text
+        )
+        SELECT count(*) FROM new_followers
+      ) AS value
+      FROM (
+        SELECT generate_series(date_trunc('day', $1::timestamp)::date, date_trunc('day', $2::timestamp)::date, interval '1 day') AS period
+      ) AS axis
+    SQL
+
+    rows = ActiveRecord::Base.connection.select_all(sql, nil, [[nil, @start_at], [nil, @end_at], [nil, params[:domain]]])
+
+    rows.map { |row| { date: row['period'], value: row['value'].to_s } }
+  end
+
+  def time_period
+    (@start_at.to_date..@end_at.to_date)
+  end
+
+  def previous_time_period
+    ((@start_at.to_date - length_of_period)..(@end_at.to_date - length_of_period))
+  end
+
+  def params
+    @params.permit(:domain)
+  end
+end