From 03bad7b1d65394eff846f411aa5c49982843b100 Mon Sep 17 00:00:00 2001
From: lonkaars <l.leblansch@gmail.com>
Date: Tue, 16 Mar 2021 14:54:38 +0100
Subject: ~rating

---
 api/game/info.py |  6 +-----
 api/rating.py    | 26 ++++++++++++++++++++++++++
 api/user/info.py |  4 +++-
 3 files changed, 30 insertions(+), 6 deletions(-)
 create mode 100644 api/rating.py

(limited to 'api')

diff --git a/api/game/info.py b/api/game/info.py
index 64812d8..a58edde 100644
--- a/api/game/info.py
+++ b/api/game/info.py
@@ -3,13 +3,9 @@ from functools import reduce
 from db import cursor
 from auth.login_token import token_login
 from user.info import format_user
+from rating import outcome
 from ruleset import resolve_ruleset
 
-def outcome(outcome_str, player_1):
-    outcome_int = { "w": 1, "l": -1, "d": 0 }[outcome_str]
-    if not player_1: outcome_int *= -1
-    return { 1: "w", -1: "l", 0: "d" }[outcome_int]
-
 def format_game(game_id, user_id = None):
     game = cursor.execute("select " + ", ".join([
         "game_id",               # 0
diff --git a/api/rating.py b/api/rating.py
new file mode 100644
index 0000000..e05645f
--- /dev/null
+++ b/api/rating.py
@@ -0,0 +1,26 @@
+from db import cursor
+
+def outcome(outcome_str, player_1):
+    outcome_int = { "w": 1, "l": -1, "d": 0 }[outcome_str]
+    if not player_1: outcome_int *= -1
+    return { 1: "w", -1: "l", 0: "d" }[outcome_int]
+
+def rating_v1(won_games): # python is a garbage language
+    return abs(won_games) ** (1 / 2.2) * 23 * (1, -1)[won_games < 0]
+
+def get_all_games(user_id):
+    return cursor.execute("select player_1_id, player_2_id, outcome " + \
+            "from games " + \
+            "where (player_1_id = ? or player_2_id = ?) " + \
+            "and status = \"finished\" or status = \"resign\"", [user_id, user_id]).fetchall()
+
+def get_rating(user_id):
+    score = 400
+    games = get_all_games(user_id)
+    mapped_games = [game if game[0] == user_id else (game[1], game[0], outcome(game[2], False)) for game in games]
+    counted_opponents = {}
+    for game in mapped_games:
+        counted_opponents |= {game[1]: (counted_opponents.get(game[1]) or 0) + { "w": 1, "l": -1, "d": 0 }[game[2]]}
+    for opponent in counted_opponents:
+        score += rating_v1(counted_opponents.get(opponent))
+    return int(score)
diff --git a/api/user/info.py b/api/user/info.py
index b60593e..a9594aa 100644
--- a/api/user/info.py
+++ b/api/user/info.py
@@ -1,6 +1,7 @@
 from flask import Blueprint, request
 from db import cursor
 from auth.login_token import token_login
+from rating import get_rating
 import json
 
 def valid_user_id(user_id):
@@ -38,7 +39,8 @@ def format_user(user_id, viewer = ''):
         "registered": user[3],
         "avatar": user[4],
         "status": user[5],
-        "friends": count_friends(user_id)
+        "friends": count_friends(user_id),
+        "rating": get_rating(user_id),
     }
     if viewer:
         formatted_user["relation"] = get_relation_to(viewer, user_id)
-- 
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