From f22fbe1ae27f943a279fe87e868620b7991081e9 Mon Sep 17 00:00:00 2001
From: ctc-devops <90984711+ctc-devops@users.noreply.github.com>
Date: Sat, 27 Apr 2024 14:23:15 -0700
Subject: [PATCH] Added /stats backend route to published-schedule.js for stats
 modal (#66)

* published-schedule route for statistics

* chaning stats route to handle season and year query

---------

Co-authored-by: subinqkim <subinlk@uci.edu>
---
 routes/publishedSchedule.js | 50 +++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/routes/publishedSchedule.js b/routes/publishedSchedule.js
index 30aa1af..749be96 100644
--- a/routes/publishedSchedule.js
+++ b/routes/publishedSchedule.js
@@ -217,6 +217,56 @@ publishedScheduleRouter.get('/season', async (req, res) => {
   }
 });
 
+// GET /published-schedule/stats - returns stats of event types and subjects for a specific season
+publishedScheduleRouter.get('/stats', async (req, res) => {
+  try {
+    const { season, year } = req.query;
+
+    const statResult = await db.query(
+      `
+      WITH all_event_types AS (
+        SELECT DISTINCT unnest(event_type) AS event_type
+        FROM catalog
+    ),
+    all_subjects AS (
+        SELECT DISTINCT unnest(subject) AS subject
+        FROM catalog
+    ),
+    all_permutations AS (
+        SELECT aet.event_type, asu.subject
+        FROM all_event_types aet
+        CROSS JOIN all_subjects asu
+    )
+    SELECT 
+        COALESCE(ap.event_type::text, 'Total') AS event_type,
+        COALESCE(ap.subject::text, 'Total') AS subject,
+        COALESCE(COUNT(c.catalog_id), 0) AS total_count
+    FROM all_permutations ap
+    LEFT JOIN (
+        SELECT *,
+               ps.day_id AS ps_day_id,
+               c.id AS catalog_id
+        FROM catalog c
+        JOIN published_schedule ps ON c.id = ps.event_id
+        JOIN day d ON PS.day_id = d.id
+        WHERE $1 = ANY(c.season)
+            AND EXTRACT(YEAR FROM d.event_date) = $2
+    ) c ON ap.event_type = ANY(c.event_type) AND ap.subject = ANY(c.subject)
+    GROUP BY ROLLUP (ap.event_type), ROLLUP (ap.subject)
+    ORDER BY CASE WHEN ap.event_type IS NULL THEN 1 ELSE 0 END,
+             CASE WHEN ap.subject IS NULL THEN 1 ELSE 0 END,
+             ap.event_type NULLS FIRST,
+             ap.subject NULLS FIRST;
+    `,
+      [season, year],
+    );
+
+    res.status(200).json(keysToCamel(statResult));
+  } catch (error) {
+    res.status(500).json({ error: 'Internal server error' });
+  }
+});
+
 // GET /published-schedule/date - returns all events occurring on a specific date
 publishedScheduleRouter.get('/dayId', async (req, res) => {
   try {