Refactor codebase

app/routes/leaderboard.py

@@ -1,8 +1,8 @@
 from flask import Blueprint, render_template
 from app.auth import login_required
 from app.db import query, query_one
-from app import SYDNEY_TZ
-from app.utils import calculate_streak
+from app.config import SYDNEY_TZ
+from app.utils import calculate_streak, calculate_weight_change
 from datetime import timezone
 
 bp = Blueprint("leaderboard", __name__)
@@ -33,13 +33,7 @@ def index():
     for u in users:
         start_w = float(u["starting_weight_kg"] or u["first_weight"] or 0)
         current_w = float(u["current_weight"] or start_w)
-
-        if start_w > 0:
-            weight_lost = start_w - current_w
-            pct_lost = round((weight_lost / start_w) * 100, 1)
-        else:
-            weight_lost = 0
-            pct_lost = 0
+        weight_lost, pct_lost = calculate_weight_change(start_w, current_w)
 
         goal = float(u["goal_weight_kg"]) if u["goal_weight_kg"] else None
         goal_progress = None
@@ -50,7 +44,7 @@ def index():
         streak = calculate_streak(u["id"])
         ranked.append({
             **u,
-            "weight_lost": round(weight_lost, 1),
+            "weight_lost": weight_lost,
             "pct_lost": pct_lost,
             "goal_progress": goal_progress,
             "streak": streak["current"],