Project Map – helldivers

Files

File	Purpose
`server.js`	Express + WebSocket (ws) + SQLite (better-sqlite3) – Auth, Scores, Matchmaking
`public/app.js`	Gesamte Client-Logik (WebSocket-Client, Practice/Match/Lobby)
`public/styles.css`	Alle Styles
`public/index.html`	App-Shell
`data/helldivers.db`	SQLite-Datenbank (Scores, Users, Sessions, History)
`scripts/`	Migrations / Seed-Skripte

app.js

State Object

state = {
  user, currentView, stratagems,
  settings: { timerDuration, difficulty },
  practice: {
    active, mode, current, queue, progress, timeLeft, timerHandle, startTime,
    score, streak, selectedCats, dailyTarget,
    lives,                          // Endless mode
    drillPool, drillCompleted, drillTotal,  // Drill mode
    speedrunStart, speedrunPool, speedrunElapsed,  // Speedrun mode
    sessionStats: { completed, missed, bestTime, stratagems, mistakes, maxStreak }
  },
  lobby: { online, incoming, pendingChallenge },
  match: { roomId, opponent, matchScores, current, myProgress, oppProgress, roundActive, roundHistory },
  leaderboard: { activeTab },
  history: { page, total },
  ws, wsReconnectTimer
}

Constants

Constant	Purpose
`RING_CIRCUMFERENCE`	`219.9` – Kreis-Umfang für Timer-Ring-Canvas (r=35)
`ELO_RANKS`	Array `{ min, label, color }` – ELO-Rangstufen
`STRATAGEMS`	Array aller Stratagems mit `name`, `category`, `icon`, `sequence`

Function	Purpose
`loadSettings() / saveSettings()`	localStorage-Persistenz für Settings
`applySettingsToUI()`	Settings auf UI-Elemente anwenden
`showView(name)`	Ansicht wechseln (login/dashboard/practice/leaderboard/history/admin)
`connectWS() / wsSend(type, payload)`	WebSocket-Verbindung + Nachrichten senden
`handleWSMessage({ type, payload })`	Eingehende WS-Nachrichten dispatchen

Key Functions – Practice

Function	Purpose
`initPracticeView()`	Practice-View initialisieren
`getPool()`	Stratagem-Pool nach Filter + Modus aufbauen
`buildQueue() / renderQueue(queue)`	Warteschlange aufbauen und rendern
`nextStratagem()`	Nächstes Stratagem anzeigen
`handlePracticeInput(dir)`	Pfeilrichtung auswerten (Treffer/Fehler)
`startPracticeTimer() / stopPracticeTimer()`	Timer für Timed-Modus
`startSpeedrunTimer()`	Timer für Speedrun-Modus
`renderPracticeStratagem()`	Aktuelles Stratagem + Pfeile rendern
`renderArrows(containerId, sequence, progress)`	Pfeil-Sequenz rendern
`updateScoreDisplay() / updateStreakDisplay() / updateLivesDisplay()`	Score-UI
`openSessionSummary() / closeSessionSummary()`	Sitzungs-Zusammenfassung Modal

Key Functions – Lobby & Match

Function	Purpose
`updateLobbyView()`	Online-Nutzer-Liste aktualisieren
`sendChallenge(target) / acceptChallenge(from) / declineChallenge(from)`	Herausforderungen verwalten
`openChallengeModal(from, elo) / closeChallengeModal()`	Challenge-Dialog
`renderMatchRound()`	Aktive Match-Runde rendern
`handleMatchInput(dir)`	Match-Eingabe auswerten
`renderRoundResult(winner)`	Rundensieger anzeigen
`openMatchResultModal({ winner, eloChanges, roundHistory })`	Match-Ergebnis-Modal

Key Functions – Admin & History

Function	Purpose
`renderAdminOverview(data)`	Admin-Dashboard: Nutzer, Scores, Aktivität
`renderAdminUsers(users)`	Nutzertabelle im Admin-Bereich
`renderAdminActivity(data)`	Aktivitätslog rendern
`renderHistoryChart(sessions)`	Verlaufs-Diagramm (Canvas)
`renderHistoryPagination(limit)`	Pagination-Buttons
`renderDashboard({ stats, rank, elo, ... })`	Haupt-Dashboard-Kacheln

server.js

Besonderheiten

SQLite (better-sqlite3) statt JSON-Dateien
WebSocket (ws-Library) für Multiplayer: Lobby, Challenges, Live-Matches
ELO-Rating-System für 1v1-Matches

Server-Side State

Variable	Purpose
`userSockets`	`Map<userId, ws>` – aktive WebSocket-Verbindungen
`pendingChallenges`	`Map<challengerId, targetId>`
`rooms`	`Map<roomId, roomState>` – aktive Match-Räume

API Routes

Route	Purpose
`POST /api/login`	Login (rate-limited)
`POST /api/logout`	Logout
`GET /api/me`	Session-Info
`POST /api/change-password`	Passwort ändern
`GET /api/users`	Alle Nutzer (Admin)
`POST /api/users`	Nutzer erstellen (Admin)
`DELETE /api/users/:username`	Nutzer löschen (Admin)
`POST /api/users/:username/reset-password`	Temp-Passwort (Admin)
`PATCH /api/users/:username`	Nutzerdaten ändern (Admin)
`GET /api/admin/overview`	Admin-Dashboard-Daten
`GET /api/admin/activity`	Aktivitätslog (Admin)
`GET /api/dashboard`	Dashboard-Daten (Stats, Rank, ELO, Daily)
`POST /api/scores/practice`	Practice-Session speichern
`GET /api/scores/leaderboard`	Gesamt-Leaderboard
`GET /api/scores/leaderboard/elo`	ELO-Rangliste
`GET /api/scores/leaderboard/speedrun`	Speedrun-Rangliste
`GET /api/scores/me`	Eigene Statistiken
`GET /api/history`	Session-Verlauf (paginiert)
`GET /api/stats/stratagems`	Stratagem-Trefferquoten
`GET /api/stratagems`	Stratagem-Liste (für Client-Sync)

WebSocket Message Types (Client → Server)

join, challenge, accept_challenge, decline_challenge, ready, input, leave_match

WebSocket Message Types (Server → Client)

lobby_update, challenge_received, challenge_declined, match_start, round_start, round_result, match_end, opponent_progress, error

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