strat-gameplay-webapp/frontend-sba/CLAUDE.md

Frontend SBA - Strat-O-Matic Baseball Association Web App

Overview

Vue 3 + Nuxt 3 frontend for the SBA league. Real-time game interface with WebSocket communication to backend.

Tech Stack: Nuxt 4.1.3, TypeScript (strict), Tailwind CSS, Pinia, Socket.io-client, Discord OAuth

CRITICAL: Nuxt 4 Breaking Changes

MUST READ: .claude/NUXT4_BREAKING_CHANGES.md

1. Explicit Store Imports Required

All Pinia stores MUST be explicitly imported:

// WRONG - will cause "useAuthStore is not defined":
const authStore = useAuthStore()

// CORRECT:
import { useAuthStore } from '~/store/auth'
const authStore = useAuthStore()

2. No app/ Directory Allowed

CRITICAL: Do NOT create an app/ directory in the frontend root. Nuxt 4 treats this as a special directory that overrides app.vue. If NuxtWelcome appears instead of your app, delete app/ and rebuild.

Project Structure

frontend-sba/
├── components/     # See components/CLAUDE.md for inventory
│   ├── Game/       # ScoreBoard, GameBoard, CurrentSituation, PlayByPlay
│   ├── Decisions/  # DecisionPanel, DefensiveSetup, OffensiveApproach
│   ├── Substitutions/
│   └── UI/         # ActionButton, ButtonGroup, ToggleSwitch
├── composables/    # See composables/CLAUDE.md for data flow
│   ├── useWebSocket.ts   # Connection, event handlers
│   └── useGameActions.ts # Game action wrappers
├── store/          # See store/CLAUDE.md for patterns
│   ├── auth.ts     # Discord OAuth, HttpOnly cookie auth
│   ├── game.ts     # Game state, lineups, decisions
│   └── ui.ts       # Toasts, modals
├── types/          # See types/CLAUDE.md for mappings
│   ├── game.ts     # GameState, PlayResult
│   ├── player.ts   # SbaPlayer, Lineup
│   └── websocket.ts
├── pages/
├── layouts/
├── middleware/
└── plugins/

Development

npm install          # First time
npm run dev          # Dev server at http://localhost:3000
npm run type-check   # Check types
npm run lint         # Lint code

Configuration

Environment Variables

Copy .env.example to .env and configure:

# API endpoints
NUXT_PUBLIC_API_URL=http://localhost:8000
NUXT_PUBLIC_WS_URL=http://localhost:8000

# Discord OAuth (public client ID - safe to expose)
NUXT_PUBLIC_DISCORD_CLIENT_ID=your-client-id
NUXT_PUBLIC_DISCORD_REDIRECT_URI=http://localhost:3000/auth/callback

# Vite dev server allowed hosts (comma-separated)
# Add your domain for external access
NUXT_ALLOWED_HOSTS=localhost,127.0.0.1

Note: NUXT_ALLOWED_HOSTS is read in nuxt.config.ts to configure Vite's allowedHosts. Required when accessing dev server through a reverse proxy or external domain.

League Theme

• Primary: #1e40af (SBA Blue)
• Secondary: #dc2626 (SBA Red)

Mobile-First Design

• Breakpoints: xs(375px), sm(640px), md(768px), lg(1024px)
• Touch-friendly: 44x44px minimum buttons
• Sticky scoreboard, bottom sheets for inputs

Key Architecture Concepts

Data Resolution Pattern

Game state contains minimal LineupPlayerState (lineup_id, position). Use gameStore.findPlayerInLineup(lineupId) to get full player data (name, headshot).

Team Determination

• Top of inning: away bats, home fields
• Bottom of inning: home bats, away fields
• Use gameStore.battingTeamId / gameStore.fieldingTeamId

Full details: See subdirectory CLAUDE.md files for component inventory, data flow, store patterns, and type mappings.

References

• WebSocket Protocol Spec: ../.claude/WEBSOCKET_PROTOCOL_SPEC.md - Complete event catalog and workflow
• Implementation Guide: ../.claude/implementation/01-infrastructure.md
• Full PRD: ../prd-web-scorecard-1.1.md

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League: SBA | Port: 3000 | Last Updated: 2025-01-19

Current Phase

Phase F2: Game State Display - COMPLETE (2025-01-10)

Components: ScoreBoard, GameBoard, CurrentSituation, PlayByPlay

Phase F3: Decision Input Workflow - NEXT

Components to integrate with live backend

See: .claude/implementation/NEXT_SESSION.md for detailed plan