From 7a141fb94b447fff46256554ce16626de2b602f9 Mon Sep 17 00:00:00 2001
From: Max Wofford <max@maxwofford.com>
Date: Sat, 15 Mar 2025 21:14:12 -0400
Subject: [PATCH] Add tracking for scrapyard pins

---
 .../scrapyard_leaderboards_controller.rb      | 36 +++++++++++++++++++
 .../scrapyard_leaderboards/index.html.erb     | 26 +++++---------
 2 files changed, 44 insertions(+), 18 deletions(-)

diff --git a/app/controllers/scrapyard_leaderboards_controller.rb b/app/controllers/scrapyard_leaderboards_controller.rb
index dcac642..6d7f4e5 100644
--- a/app/controllers/scrapyard_leaderboards_controller.rb
+++ b/app/controllers/scrapyard_leaderboards_controller.rb
@@ -1,10 +1,16 @@
 class ScrapyardLeaderboardsController < ApplicationController
   # March 14, 2024 at 8:00 PM Eastern
   TRACKING_START_TIME = Time.find_zone("Eastern Time (US & Canada)").local(2025, 3, 14, 20, 0).to_i
+  PINNED_EVENT_TIMEOUT = 1.minutes
 
   def index
     @sort_by = params[:sort] == "average" ? "average" : "total"
 
+    # If there's a pinned event, cache it
+    if params[:event_pin].present?
+      mark_event_as_pinned(params[:event_pin])
+    end
+
     # Cache the expensive computations for 10 seconds
     @event_stats = Rails.cache.fetch("scrapyard_leaderboard_stats", expires_in: 10.seconds) do
       # Get all attendees and their emails in one query
@@ -63,6 +69,15 @@ class ScrapyardLeaderboardsController < ApplicationController
         -stats[:total_seconds]
       end
     end
+
+    # Get currently pinned events
+    @pinned_events = get_pinned_events
+  end
+
+  def pin
+    event_id = params[:id]
+    mark_event_as_pinned(event_id)
+    head :ok
   end
 
   def show
@@ -104,4 +119,25 @@ class ScrapyardLeaderboardsController < ApplicationController
       stats.sort_by { |stats| -stats[:total_seconds] }
     end
   end
+
+  private
+
+  def mark_event_as_pinned(event_id)
+    Rails.cache.write(
+      "pinned_event:#{event_id}",
+      true,
+      expires_in: PINNED_EVENT_TIMEOUT
+    )
+  end
+
+  def get_pinned_events
+    # Get all cache keys for pinned events
+    cache_keys = Rails.cache.instance_variable_get(:@data)
+      .keys
+      .select { |k| k.start_with?("pinned_event:") }
+    return [] if cache_keys.empty?
+
+    event_ids = cache_keys.map { |k| k.split(":").last }
+    Warehouse::ScrapyardEvent.where(id: event_ids)
+  end
 end
diff --git a/app/views/scrapyard_leaderboards/index.html.erb b/app/views/scrapyard_leaderboards/index.html.erb
index ba2f7ae..7b8d735 100644
--- a/app/views/scrapyard_leaderboards/index.html.erb
+++ b/app/views/scrapyard_leaderboards/index.html.erb
@@ -14,7 +14,7 @@
 
   <% @event_stats.each_with_index do |stats, index| %>
     <div class="event-card" id="event-<%= stats[:event].id %>">
-      <a href="#<%= stats[:event].id %>" class="pin-link" title="Copy link to this event">📌</a>
+      <a href="?event_pin=<%= stats[:event].id %>" class="pin-link" title="Pin this event">📌</a>
       <h2>
         <%= link_to scrapyard_leaderboard_path(stats[:event]) do %>
           <% case index %>
@@ -28,6 +28,9 @@
             <span class="ordinal"><%= (index + 1).ordinalize %></span>
           <% end %>
           <%= stats[:event].name %>
+          <% if @pinned_events.include?(stats[:event]) %>
+            <span title="Currently being watched">👀</span>
+          <% end %>
         <% end %>
       </h2>
       <div class="stats">
@@ -62,8 +65,8 @@
 <% content_for :head do %>
   <script>
     function handlePin() {
-      console.log("Handling pin");
-      const pinId = window.location.hash.substring(1);
+      const params = new URLSearchParams(window.location.search);
+      const pinId = params.get('event_pin');
       
       if (pinId) {
         const targetCard = document.getElementById('event-' + pinId);
@@ -84,28 +87,15 @@
       }
     }
 
-    // Add click handlers to pin links
-    document.addEventListener('turbo:load', function() {
-      document.querySelectorAll('.pin-link').forEach(link => {
-        link.addEventListener('click', function(e) {
-          e.preventDefault();
-          const hash = this.getAttribute('href');
-          window.location.hash = hash;
-          handlePin();
-          window.location.reload();
-        });
-      });
-    });
-
     // Handle both initial page load and subsequent Turbo navigations
     document.addEventListener('turbo:load', handlePin);
     document.addEventListener('turbo:render', handlePin);
     document.addEventListener('DOMContentLoaded', handlePin);
-    window.addEventListener('hashchange', handlePin);
 
     // Set up auto-refresh if we have a pin
     document.addEventListener('turbo:load', function() {
-      if (window.location.hash) {
+      const params = new URLSearchParams(window.location.search);
+      if (params.has('event_pin')) {
         // Clear any existing refresh interval
         if (window.refreshInterval) {
           clearInterval(window.refreshInterval);