From 30de8107b499741808150db61abecd623bf1581b Mon Sep 17 00:00:00 2001
From: Ilion Beyst <ilion.beyst@gmail.com>
Date: Tue, 17 May 2022 21:13:29 +0200
Subject: [PATCH] implement leaderboard endpoint

---
 planetwars-server/src/db/ratings.rs  | 29 +++++++++++++++++++++++++++-
 planetwars-server/src/lib.rs         |  1 +
 planetwars-server/src/routes/bots.rs |  7 +++++++
 3 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/planetwars-server/src/db/ratings.rs b/planetwars-server/src/db/ratings.rs
index bee8548..8262fed 100644
--- a/planetwars-server/src/db/ratings.rs
+++ b/planetwars-server/src/db/ratings.rs
@@ -1,7 +1,8 @@
 use diesel::{prelude::*, PgConnection, QueryResult};
 use serde::{Deserialize, Serialize};
 
-use crate::schema::{bots, ratings};
+use crate::db::bots::Bot;
+use crate::schema::{bots, ratings, users};
 
 #[derive(Queryable, Debug, Insertable, PartialEq, Serialize, Deserialize)]
 pub struct Rating {
@@ -25,3 +26,29 @@ pub fn set_rating(bot_id: i32, rating: f64, db_conn: &PgConnection) -> QueryResu
         .set(ratings::rating.eq(rating))
         .execute(db_conn)
 }
+
+#[derive(Queryable, Serialize, Deserialize)]
+pub struct Author {
+    id: i32,
+    username: String,
+}
+
+#[derive(Queryable, Serialize, Deserialize)]
+pub struct RankedBot {
+    pub bot: Bot,
+    pub author: Option<Author>,
+    pub rating: f64,
+}
+
+pub fn get_bot_ranking(db_conn: &PgConnection) -> QueryResult<Vec<RankedBot>> {
+    bots::table
+        .left_join(users::table)
+        .inner_join(ratings::table)
+        .select((
+            bots::all_columns,
+            (users::id, users::username).nullable(),
+            ratings::rating,
+        ))
+        .order_by(ratings::rating.desc())
+        .get_results(db_conn)
+}
diff --git a/planetwars-server/src/lib.rs b/planetwars-server/src/lib.rs
index 3f6caa9..28d7a76 100644
--- a/planetwars-server/src/lib.rs
+++ b/planetwars-server/src/lib.rs
@@ -91,6 +91,7 @@ pub fn api() -> Router {
             "/matches/:match_id/log",
             get(routes::matches::get_match_log),
         )
+        .route("/leaderboard", get(routes::bots::get_ranking))
         .route("/submit_bot", post(routes::demo::submit_bot))
         .route("/save_bot", post(routes::bots::save_bot))
 }
diff --git a/planetwars-server/src/routes/bots.rs b/planetwars-server/src/routes/bots.rs
index 2cdea2a..3bbaa1a 100644
--- a/planetwars-server/src/routes/bots.rs
+++ b/planetwars-server/src/routes/bots.rs
@@ -12,6 +12,7 @@ use std::path::PathBuf;
 use thiserror;
 
 use crate::db::bots::{self, CodeBundle};
+use crate::db::ratings::{RankedBot, self};
 use crate::db::users::User;
 use crate::modules::bots::save_code_bundle;
 use crate::{DatabaseConnection, BOTS_DIR};
@@ -170,6 +171,12 @@ pub async fn list_bots(conn: DatabaseConnection) -> Result<Json<Vec<Bot>>, Statu
         .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)
 }
 
+pub async fn get_ranking(conn: DatabaseConnection) -> Result<Json<Vec<RankedBot>>, StatusCode> {
+    ratings::get_bot_ranking(&conn)
+        .map(Json)
+        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)
+}
+
 // TODO: currently this only implements the happy flow
 pub async fn upload_code_multipart(
     conn: DatabaseConnection,