feat: add analytics. start with factcheck article contribution

-  setting up analytics route and controller
- fetch factcheck urls and authors, displaying it on UI
- counting urls and displaying data on a table

Author: aatmanvaidya

lib/dau/analytics.ex

@@ -0,0 +1,36 @@
+defmodule DAU.Analytics do
+  import Ecto.Query
+  alias DAU.Feed.Common
+  alias DAU.Repo
+
+  def fetch_author_and_url(opts \\ []) do
+    query =
+      Common
+      |> query_author_and_url()
+
+    query =
+      case Keyword.get(opts, :test_run) do
+        true -> query |> limit(20) |> offset(0)
+        _ -> query
+      end
+
+    query
+    |> Repo.all()
+    |> count_urls_per_username()
+  end
+
+  defp query_author_and_url(query) do
+    from c in query,
+      select: %{
+        username: fragment("jsonb_array_elements(?)->>'username'", c.factcheck_articles),
+        url: fragment("jsonb_array_elements(?)->>'url'", c.factcheck_articles)
+      }
+  end
+
+  defp count_urls_per_username(data) do
+    data
+    |> Enum.group_by(& &1.username)
+    |> Enum.map(fn {username, urls} -> %{username: username, url_count: Enum.count(urls)} end)
+    |> Enum.sort(&(&1.url_count >= &2.url_count))
+  end
+end

lib/dau_web/controllers/analytics_controller.ex

@@ -0,0 +1,9 @@
+defmodule DAUWeb.AnalyticsController do
+  use DAUWeb, :controller
+  alias DAU.Analytics
+
+  def hello_world(conn, _params) do
+    data = Analytics.fetch_author_and_url()
+    render(conn, :index, data: data)
+  end
+end

lib/dau_web/controllers/analytics_html.ex

@@ -0,0 +1,17 @@
+defmodule DAUWeb.AnalyticsHTML do
+  use DAUWeb, :html
+  import DAUWeb.CoreComponents
+
+  def index(assigns) do
+    ~H"""
+    <div class="flex justify-center">
+      <div class="w-full max-w-4xl mx-auto">
+        <.table id="analytics-table" rows={@data}>
+          <:col :let={item} label="Username"><%= item.username %></:col>
+          <:col :let={item} label="Factcheck Articles Added"><%= item.url_count %></:col>
+        </.table>
+      </div>
+    </div>
+    """
+  end
+end

lib/dau_web/router.ex

@@ -158,4 +158,10 @@ defmodule DAUWeb.Router do
       live "/users/confirm", UserConfirmationInstructionsLive, :new
     end
   end
+
+  scope "/analytics", DAUWeb do
+    pipe_through [:browser]
+
+    get "/", AnalyticsController, :hello_world
+  end
 end