Add collection stats endpoint

tutor/database.py

@@ -356,3 +356,23 @@ async def store_var(db: psycopg.Cursor, key: str, value: str) -> None:
         """,
         {"key": key, "value": value},
     )
+
+
+async def collection_stats(db: psycopg.Cursor) -> dict:
+    db.row_factory = psycopg.rows.dict_row
+    await db.execute(
+        """
+                SELECT COUNT("copies"."id") AS cards
+                     , SUM(
+                           CASE WHEN "copies"."isFoil"
+                           THEN "card_prices"."usd_foil"
+                           ELSE "card_prices"."usd"
+                           END
+                       ) AS value
+                     , COUNT(DISTINCT cards.set_code) AS sets
+                FROM "copies"
+                JOIN "cards" USING ("scryfall_id")
+                LEFT JOIN "card_prices" USING ("scryfall_id")
+                """
+    )
+    return await db.fetchone()

tutor/server.py

@@ -4,6 +4,7 @@ import typing
 import urllib.parse
 
 import psycopg
+import psycopg.rows
 import psycopg_pool
 import tornado.ioloop
 import tornado.web
@@ -85,11 +86,13 @@ class SearchHandler(tornado.web.RequestHandler):
         if has_more:
             links["next"] = update_args(self.request.full_url(), page=page + 1)
         self.set_links(**links)
+
         def price(amount: typing.Optional[decimal.Decimal]) -> typing.Optional[str]:
             if amount is not None:
                 return str(amount)
             else:
                 return None
+
         self.write(
             json.dumps(
                 [
@@ -119,10 +122,22 @@ class SearchHandler(tornado.web.RequestHandler):
         )
 
 
+class CollectionHandler(tornado.web.RequestHandler):
+    async def get(self) -> None:
+        async with self.application.pool.connection() as conn:
+            async with conn.cursor() as cursor:
+                self.write(
+                    json.dumps(
+                        await tutor.database.collection_stats(cursor), default=str
+                    )
+                )
+
+
 class Application(tornado.web.Application):
     def __init__(self, **settings):
         paths = [
             (r"/search", SearchHandler),
+            (r"/collection", CollectionHandler),
         ]
         if static_path := settings.get("static"):
             paths.extend(