add rank delta to leaderboard

app.py

@@ -7,6 +7,7 @@ from pathlib import Path
 from flask import Flask, flash, redirect, render_template, request, session, url_for
 
 from stats import (
+    apply_rank_changes,
     build_leaderboard,
     build_session_summaries,
     cents_to_dollars,
@@ -71,22 +72,30 @@ def home() -> str:
 def leaderboard() -> str:
     events = load_events(DATA_PATH)
     all_sessions = build_session_summaries(events)
+    ordered_sessions = sorted(all_sessions, key=lambda s: s.session_date)
+
+    session_dates = [session.session_date for session in ordered_sessions]
     selected_session_date = request.args.get("through_session", "").strip()
-    valid_session_dates = {session.session_date for session in all_sessions}
 
-    if selected_session_date not in valid_session_dates:
+    if session_dates:
-        selected_session_date = ""
+        if selected_session_date in session_dates:
+            cutoff_index = session_dates.index(selected_session_date)
+        else:
+            cutoff_index = len(session_dates) - 1
+            selected_session = session_dates[cutoff_index]
 
-    filtered_sessions = all_sessions
+        filtered_sessions = ordered_sessions[: cutoff_index + 1]
-    if selected_session_date:
+        previous_sessions = ordered_sessions[:cutoff_index]
-        filtered_sessions = [
+    else:
-            session
+        filtered_sessions = []
-            for session in all_sessions
+        previous_sessions = []
-            if session.session_date <= selected_session_date
-        ]
 
     board = build_leaderboard(filtered_sessions)
+    previous_board = build_leaderboard(previous_sessions)
+    board = apply_rank_changes(board, previous_board)
+
     chart_data = cumulative_profit_series(filtered_sessions)
+
     return render_template(
         "leaderboard.html",
         leaderboard=board,

static/css/style.css

@@ -489,6 +489,31 @@ h2 {
     letter-spacing: -0.06em;
 }
 
+.rank-move {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    min-width: 2.5rem;
+    font-weight: 650;
+    letter-spacing: 0.01em;
+}
+
+.rank-up {
+    color: #22c55e;
+}
+
+.rank-down {
+    color: #ef4444;
+}
+
+.rank-flat {
+    color: var(--text-muted);
+}
+
+.inline-filter-form select {
+    min-width: 12rem;
+}
+
 .table-wrap {
     position: relative;
     z-index: 1;

stats.py

@@ -71,15 +71,30 @@ class PlayerStats:
     total_cash_out_cents: int
     total_net_cents: int
     roi_pct: float
+    rank_change: int = 0
 
 
+def apply_rank_changes(
+    current_board: list[PlayerStats], prev_board: list[PlayerStats]
+) -> list[PlayerStats]:
+    prev_ranks = {p.player_name: i for i, p in enumerate(prev_board, start=1)}
+
+    for i, p in enumerate(current_board, start=1):
+        prev_rank = prev_ranks.get(p.player_name)
+
+        if prev_rank is None:
+            p.rank_change = 0
+        else:
+            p.rank_change = prev_rank - i
+
+    return current_board
+
 
 def cents_to_dollars(cents: int) -> str:
     value = cents / 100
     return f"${value:,.2f}"
 
 
-
 def safe_date_label(session_date: str) -> str:
     try:
         return datetime.strptime(session_date, "%Y-%m-%d").strftime("%b %d, %Y")
@@ -87,7 +102,6 @@ def safe_date_label(session_date: str) -> str:
         return session_date
 
 
-
 def color_for_name(name: str, names: list[str]) -> str:
     try:
         index = sorted(names, key=str.casefold).index(name)
@@ -96,7 +110,6 @@ def color_for_name(name: str, names: list[str]) -> str:
     return PLAYER_PALETTE[index % len(PLAYER_PALETTE)]
 
 
-
 def net_tone(value_cents: int) -> str:
     if value_cents > 0:
         return "#22c55e"
@@ -105,7 +118,6 @@ def net_tone(value_cents: int) -> str:
     return "#f59e0b"
 
 
-
 def build_session_summaries(events: list[EventRow]) -> list[SessionSummary]:
     grouped: dict[tuple[str, str], SessionEntry] = {}
 
@@ -141,7 +153,6 @@ def build_session_summaries(events: list[EventRow]) -> list[SessionSummary]:
     return sessions
 
 
-
 def build_leaderboard(sessions: list[SessionSummary]) -> list[PlayerStats]:
     player_entries: dict[str, list[SessionEntry]] = defaultdict(list)
     for session in sessions:
@@ -162,7 +173,9 @@ def build_leaderboard(sessions: list[SessionSummary]) -> list[PlayerStats]:
         break_even_sessions = sessions_played - winning_sessions - losing_sessions
         win_pct = (winning_sessions / sessions_played * 100) if sessions_played else 0.0
         avg_win = round(sum(wins) / len(wins)) if wins else 0
-        avg_loss = round(sum(abs(value) for value in losses) / len(losses)) if losses else 0
+        avg_loss = (
+            round(sum(abs(value) for value in losses) / len(losses)) if losses else 0
+        )
         biggest_win = max(wins) if wins else 0
         biggest_loss = min(losses) if losses else 0
         roi_pct = (total_net / total_buy_in * 100) if total_buy_in else 0.0
@@ -193,11 +206,14 @@ def build_leaderboard(sessions: list[SessionSummary]) -> list[PlayerStats]:
     return leaderboard
 
 
-
 def cumulative_profit_series(sessions: list[SessionSummary]) -> dict[str, Any]:
     ordered_sessions = sorted(sessions, key=lambda session: session.session_date)
     player_names = sorted(
-        {entry.player_name for session in ordered_sessions for entry in session.entries},
+        {
+            entry.player_name
+            for session in ordered_sessions
+            for entry in session.entries
+        },
         key=str.casefold,
     )
 
@@ -211,7 +227,11 @@ def cumulative_profit_series(sessions: list[SessionSummary]) -> dict[str, Any]:
 
         for session in ordered_sessions:
             matching_entry = next(
-                (entry for entry in session.entries if entry.player_name == player_name),
+                (
+                    entry
+                    for entry in session.entries
+                    if entry.player_name == player_name
+                ),
                 None,
             )
             if matching_entry is not None:
@@ -241,8 +261,9 @@ def cumulative_profit_series(sessions: list[SessionSummary]) -> dict[str, Any]:
     return {"labels": labels, "datasets": datasets}
 
 
-
+def player_session_series(
-def player_session_series(sessions: list[SessionSummary], player_name: str) -> dict[str, Any]:
+    sessions: list[SessionSummary], player_name: str
+) -> dict[str, Any]:
     ordered_sessions = sorted(sessions, key=lambda session: session.session_date)
     labels: list[str] = []
     net_values: list[float] = []
@@ -250,7 +271,11 @@ def player_session_series(sessions: list[SessionSummary], player_name: str) -> d
     running_total = 0
 
     all_player_names = sorted(
-        {entry.player_name for session in ordered_sessions for entry in session.entries},
+        {
+            entry.player_name
+            for session in ordered_sessions
+            for entry in session.entries
+        },
         key=str.casefold,
     )
 
@@ -276,11 +301,9 @@ def player_session_series(sessions: list[SessionSummary], player_name: str) -> d
     }
 
 
-
 def session_events(events: list[EventRow], session_date: str) -> list[EventRow]:
     return [event for event in events if event["session_date"] == session_date]
 
 
-
 def unique_player_names(events: list[EventRow]) -> list[str]:
     return sorted({event["player_name"] for event in events}, key=str.casefold)

templates/leaderboard.html

@@ -66,6 +66,7 @@
             <thead>
                 <tr>
                     <th><button type="button" class="sort-button" data-sort-key="rank" data-sort-type="number" data-initial-direction="asc">Rank <span class="sort-indicator">↕</span></button></th>
+                    <th><button type="button" class="sort-button" data-sort-key="rankdelta" data-sort-type="number" data-initial-direction="desc">Rank Δ <span class="sort-indicator">↕</span></button></th>
                     <th><button type="button" class="sort-button" data-sort-key="player" data-sort-type="string" data-initial-direction="asc">Player <span class="sort-indicator">↕</span></button></th>
                     <th><button type="button" class="sort-button" data-sort-key="buyins" data-sort-type="number" data-initial-direction="desc">Buy-ins <span class="sort-indicator">↕</span></button></th>
                     <th><button type="button" class="sort-button" data-sort-key="cashouts" data-sort-type="number" data-initial-direction="desc">Cash-outs <span class="sort-indicator">↕</span></button></th>
@@ -81,6 +82,15 @@
                 {% for player in leaderboard %}
                 <tr data-player-row="true" data-original-rank="{{ loop.index }}">
                     <td data-sort-value="{{ loop.index }}" data-rank-cell>#{{ loop.index }}</td>
+                    <td data-sort-value="{{ player.rank_change }}">
+                        {% if player.rank_change > 0 %}
+                            <span class="rank-move rank-up">↑ {{ player.rank_change }}</span>
+                        {% elif player.rank_change < 0 %}
+                            <span class="rank-move rank-down">↓ {{ player.rank_change | abs }}</span>
+                        {% else %}
+                            <span class="rank-move rank-neutral">-</span>
+                        {% endif %}
+                    </td>
                     <td data-sort-value="{{ player.player_name|lower }}"><a href="{{ url_for('player_detail', player_name=player.player_name) }}">{{ player.player_name }}</a></td>
                     <td data-sort-value="{{ player.total_buy_in_cents }}">{{ player.total_buy_in_cents | money }}</td>
                     <td data-sort-value="{{ player.total_cash_out_cents }}">{{ player.total_cash_out_cents | money }}</td>
@@ -93,7 +103,7 @@
                 </tr>
                 {% else %}
                 <tr>
-                    <td colspan="10">No data yet. Add the first event from the admin page.</td>
+                    <td colspan="11">No data yet. Add the first event from the admin page.</td>
                 </tr>
                 {% endfor %}
             </tbody>
@@ -254,15 +264,16 @@
     const sortButtons = Array.from(document.querySelectorAll('.sort-button'));
     const columnIndexMap = {
         rank: 0,
-        player: 1,
+        rankdelta: 1,
-        buyins: 2,
+        player: 2,
-        cashouts: 3,
+        buyins: 3,
-        net: 4,
+        cashouts: 4,
-        winpct: 5,
+        net: 5,
-        roi: 6,
+        winpct: 6,
-        avgwin: 7,
+        roi: 7,
-        avgloss: 8,
+        avgwin: 8,
-        sessions: 9,
+        avgloss: 9,
+        sessions: 10,
     };
 
     function updateRankCells() {