1 files changed, 0 insertions, 64 deletions
diff --git a/tools/elo.js b/tools/elo.js
deleted file mode 100644
index f6064f1..0000000
--- a/tools/elo.js
+++ /dev/null
@@ -1,64 +0,0 @@
-#!/usr/bin/env -S node
-
-const sqlite3 = require("better-sqlite3")
-
-const db = new sqlite3("db")
-
-const SQL_SELECT_GAMES = db.prepare("select * from rated_games_view order by mtime")
-const SQL_SELECT_RATING = db.prepare("select * from player_rating_view where game_id=?")
-const SQL_INSERT_RATING = db.prepare("insert or replace into ratings (title_id,user_id,rating,count,last) values (?,?,?,?,?)")
-
-function is_winner(role, result) {
-	// NOTE: uses substring matching for multiple winners instead of splitting result on comma.
-	return (result === "Draw" || result === role || result.includes(role))
-}
-
-function elo_k(n) {
-	return 30
-}
-
-function elo_ev(a, players) {
-	// Generalized formula for multiple players.
-	// https://arxiv.org/pdf/2104.05422.pdf
-	let sum = 0
-	for (let p of players)
-		sum += Math.pow(10, p.rating / 400)
-	return Math.pow(10, a.rating / 400) / sum
-}
-
-function elo_change(a, players, s) {
-	return Math.round(elo_k(a.count) * (s - elo_ev(a, players)))
-}
-
-function update_elo_ratings(game) {
-	let players = SQL_SELECT_RATING.all(game.game_id)
-
-	if (game.player_count !== players.length)
-		return
-
-	if (!game.result || game.result === "None")
-		return
-
-	let winners = 0
-	for (let p of players)
-		if (is_winner(p.role, game.result))
-			winners ++
-
-	if (winners === 0)
-		return
-
-	for (let p of players)
-		if (is_winner(p.role, game.result))
-			p.change = elo_change(p, players, 1 / winners)
-		else
-			p.change = elo_change(p, players, 0)
-
-	for (let p of players)
-		SQL_INSERT_RATING.run(game.title_id, p.user_id, p.rating + p.change, p.count + 1, game.mtime)
-}
-
-db.exec("begin transaction")
-db.exec("delete from ratings")
-for (let game of SQL_SELECT_GAMES.all())
-	update_elo_ratings(game)
-db.exec("commit")