feat(members): assign team roles from the tournament registration sheet

Match members by Discord username against the lineup nicknames in the
separate registration spreadsheet (TEAM_SHEET_ID) and give each their
team's role. One team per person: switching teams removes the old team
role, and a team with no Discord role yet is auto-created. Only role
names present in the sheet are ever touched, so organisation/field/base
roles are never at risk; the feature is a no-op when TEAM_SHEET_ID is
unset.

The sheet is not a single table (merged rows, stacked CS2/LoL sections
with different layouts), so it is parsed via raw-row scanning rather than
get_all_records. Citizenship markers like "(EST)" are used only as
player delimiters and discarded.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

core/sheets.py

@@ -8,6 +8,7 @@ Pure-cache helpers (get_cache, find_*) remain sync.
 
 import asyncio
 import logging
+import re
 
 import gspread
 from google.oauth2.service_account import Credentials
@@ -250,3 +251,163 @@ def _add_new_member_row_sync(username: str, discord_id: int) -> None:
 async def add_new_member_row(username: str, discord_id: int) -> None:
     """Append a new row pre-filled with Discord username and User ID (non-blocking)."""
     await asyncio.to_thread(_add_new_member_row_sync, username, discord_id)
+
+
+# ===========================================================================
+# Team registration sheet (a SEPARATE spreadsheet, config.TEAM_SHEET_ID)
+# ---------------------------------------------------------------------------
+# Unlike the member roster this sheet is NOT a single clean table: it stacks
+# several game sections (CS2, LoL, ...) - each with merged title/description
+# rows, its own header row, and a block of team rows - across one or more tabs.
+# So we read raw cell values (get_all_values) and scan for header rows rather
+# than relying on get_all_records, which requires one rectangular table.
+#
+# Each team's players live in one "Lineup" cell, comma-joined, every nickname
+# suffixed with a citizenship marker like "(EST)". Those nicknames ARE the
+# players' Discord usernames; the citizenship is used only as a delimiter
+# (a nickname may itself contain commas) and then discarded.
+# ===========================================================================
+
+# Matches a citizenship marker such as "(EST)" / "(LAT)". Used to split a
+# lineup cell into individual players, then thrown away.
+_CITIZENSHIP_RE = re.compile(r"\(\s*[A-Za-z]{2,4}\s*\)")
+
+_TEAM_NAME_HEADER = "team name"
+_LINEUP_HEADER_PREFIX = "lineup"
+
+# Team-sheet caches (mirrors the member-roster cache above)
+_team_roster: dict[str, list[str]] = {}   # team name -> [Discord username, ...]
+_team_by_username: dict[str, str] = {}     # normalized username -> team name
+_team_names: set[str] = set()              # universe of all team names
+
+
+def parse_lineup(cell: str) -> list[str]:
+    """Split one 'Lineup' cell into player nicknames (Discord usernames).
+
+    Players are delimited by their trailing citizenship marker, e.g.
+        'TFT (EST), nqmm (EST), sn1rk (EST)' -> ['TFT', 'nqmm', 'sn1rk']
+    Splitting on the marker (not on commas) keeps nicknames that themselves
+    contain commas or semicolons intact. Falls back to comma-splitting when a
+    cell carries no citizenship markers at all.
+    """
+    cell = str(cell).strip()
+    if not cell:
+        return []
+    names: list[str] = []
+    last = 0
+    matched = False
+    for m in _CITIZENSHIP_RE.finditer(cell):
+        matched = True
+        chunk = cell[last:m.start()].strip().strip(",;").strip()
+        if chunk:
+            names.append(chunk)
+        last = m.end()
+    if not matched:
+        return [p.strip() for p in cell.split(",") if p.strip()]
+    tail = cell[last:].strip().strip(",;").strip()  # stray name after last marker
+    if tail:
+        names.append(tail)
+    return names
+
+
+def _find_col(row: list, matches) -> int | None:
+    for idx, cell in enumerate(row):
+        if matches(str(cell)):
+            return idx
+    return None
+
+
+def _cell(row: list, idx: int) -> str:
+    return str(row[idx]) if 0 <= idx < len(row) else ""
+
+
+def parse_team_rosters(rows: list[list]) -> dict[str, list[str]]:
+    """Extract {team_name: [nickname, ...]} from a tab's raw rows.
+
+    Scans for every header row that has both a 'Team Name' and a 'Lineup...'
+    column, then reads the rows beneath it (using that section's own column
+    positions) until the team-name column goes blank or a new header appears.
+    Handles multiple stacked sections with differing layouts in one tab.
+    """
+    rosters: dict[str, list[str]] = {}
+    i, n = 0, len(rows)
+    while i < n:
+        name_col = _find_col(rows[i], lambda c: c.strip().lower() == _TEAM_NAME_HEADER)
+        lineup_col = _find_col(rows[i], lambda c: c.strip().lower().startswith(_LINEUP_HEADER_PREFIX))
+        if name_col is None or lineup_col is None:
+            i += 1
+            continue
+        i += 1  # move past the header into the data block
+        while i < n:
+            team = _cell(rows[i], name_col).strip()
+            if not team or team.lower() == _TEAM_NAME_HEADER:
+                break  # blank team-name (or a new header) ends this section
+            players = parse_lineup(_cell(rows[i], lineup_col))
+            if players:
+                rosters.setdefault(team, []).extend(players)
+            i += 1
+    return rosters
+
+
+def build_username_index(rosters: dict[str, list[str]]) -> dict[str, str]:
+    """Invert {team: [usernames]} into {normalized username: team}.
+
+    If the same username appears on two teams the last one wins and a warning
+    is logged (a person is expected to be on exactly one team).
+    """
+    index: dict[str, str] = {}
+    for team, players in rosters.items():
+        for player in players:
+            key = player.strip().lower()
+            if not key:
+                continue
+            if key in index and index[key] != team:
+                log.warning(
+                    "Player %r appears on both %r and %r; using %r",
+                    player, index[key], team, team,
+                )
+            index[key] = team
+    return index
+
+
+def _refresh_teams_sync() -> dict[str, list[str]]:
+    global _team_roster, _team_by_username, _team_names
+    creds = Credentials.from_service_account_file(config.GOOGLE_CREDS_PATH, scopes=SCOPES)
+    client = gspread.authorize(creds)
+    spreadsheet = client.open_by_key(config.TEAM_SHEET_ID)
+
+    rosters: dict[str, list[str]] = {}
+    for ws in spreadsheet.worksheets():
+        for team, players in parse_team_rosters(ws.get_all_values()).items():
+            rosters.setdefault(team, []).extend(players)
+
+    _team_roster = rosters
+    _team_by_username = build_username_index(rosters)
+    _team_names = set(rosters)
+    return rosters
+
+
+async def refresh_teams() -> dict[str, list[str]]:
+    """Reload the team registration sheet into the in-memory team caches.
+
+    No-op returning {} when TEAM_SHEET_ID is not configured, so the whole
+    feature can be left switched off without touching sync behaviour.
+    """
+    if not config.TEAM_SHEET_ID:
+        return {}
+    return await asyncio.to_thread(_refresh_teams_sync)
+
+
+def get_team_for_username(username: str) -> str | None:
+    """Return the team a Discord username is registered on, or None."""
+    return _team_by_username.get(str(username).strip().lower())
+
+
+def all_team_names() -> set[str]:
+    """Every team name known from the registration sheet (the role universe)."""
+    return set(_team_names)
+
+
+def get_team_rosters() -> dict[str, list[str]]:
+    """Current {team: [usernames]} cache (mainly for diagnostics/tests)."""
+    return _team_roster