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# CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
## Project Overview
Gym Tracker is a containerized web application for tracking gym sessions and muscle group training frequency. It displays a heatmap of workout sessions, tracks muscle group balance, and provides insights into training patterns.
**Tech Stack:**
- **Backend:** Node.js with Express (REST API)
- **Database:** SQLite (file-based, for simplicity)
- **Frontend:** Vanilla JavaScript (no build process)
- **Deployment:** Docker container with Nginx reverse proxy
## Commands
### Backend Development
```bash
# Install dependencies
cd backend && npm install
# Start the backend server (port 3000)
npm start
```
### Docker
```bash
# Build the Docker image
docker build -t gym-tracker .
# Run the container
docker run -p 80:80 -p 3000:3000 -v $(pwd)/data:/app/data gym-tracker
# Note: Volume mount for /app/data ensures SQLite database persists across restarts
```
## Architecture
### Backend Structure
- **`backend/server.js`**: Express server with REST API endpoints
- `GET /api/sessions` - Fetch all gym sessions
- `POST /api/sessions` - Create new session (requires date and muscle_groups array)
- `PUT /api/sessions/:id` - Update existing session
- `DELETE /api/sessions/:id` - Delete session
- **`backend/database.js`**: SQLite database layer with schema and query functions
- **Database schema**: Single `sessions` table with columns: `id` (TEXT), `date` (TEXT, ISO format), `muscle_groups` (TEXT, JSON array)
### Frontend Structure
- **`frontend/index.html`**: Main HTML structure
- **`frontend/app.js`**: Core application logic and state management
- **`frontend/api.js`**: API client for backend communication
- **`frontend/styles.css`**: Application styling
- **Frontend architecture**: Modular vanilla JS without build tools, served directly by Nginx
### Muscle Groups
The application tracks 6 muscle groups: Chest, Legs, Delts (shoulders), Lats (back), Triceps, Biceps
### Balance Indicator Logic
- **Happy**: All 6 muscle groups trained 2+ times in last 7 days
- **Neutral**: All 6 muscle groups trained 1+ times in last 7 days
- **Angry**: Any muscle group not trained in last 7 days
### Docker Configuration
- Single container runs both Nginx (frontend) and Express (backend)
- Nginx serves static files and proxies `/api/*` requests to Express
- SQLite database requires volume mount for persistence
- Ports: 80 (Nginx/HTTP), 3000 (Express API)
## Important Implementation Details
### Date Format
All dates are stored and transmitted in ISO 8601 format (YYYY-MM-DD) for consistency between frontend and backend.
### Session IDs
Sessions use UUID format for unique identification.
### Muscle Groups Storage
Muscle groups are stored as JSON-encoded arrays in the SQLite TEXT column, e.g., `["Chest", "Legs", "Delts"]`.
### Heatmap Implementation
Uses Cal-Heatmap library (loaded via CDN) to visualize workout frequency across the year.

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# Gym Tracker App - Implementation Plan
## Overview
This document outlines the step-by-step implementation plan for building the Gym Tracker application based on the Product Design Document. The application will be containerized using Docker and consist of a Node.js/Express backend with SQLite database, and a vanilla JavaScript frontend served by Nginx.
## Project Structure
```
gym-tracker/
├── backend/
│ ├── server.js # Express server and API routes
│ ├── database.js # SQLite database setup and queries
│ ├── package.json # Node.js dependencies
│ └── package-lock.json
├── frontend/
│ ├── index.html # Main HTML file
│ ├── styles.css # CSS styling
│ ├── app.js # Main application logic
│ ├── heatmap.js # Heatmap component logic
│ ├── muscleGroups.js # Muscle group tracking logic
│ └── api.js # API client for backend communication
├── nginx/
│ └── nginx.conf # Nginx configuration
├── Dockerfile # Docker container definition
└── README.md # Setup and usage instructions
```
## Implementation Phases
### Phase 1: Backend Setup
#### Step 1.1: Initialize Node.js Backend
- [ ] Create `backend/` directory
- [ ] Initialize npm project (`npm init`)
- [ ] Install dependencies:
- `express` - Web framework
- `sqlite3` - SQLite database driver
- `cors` - Enable CORS for API
- `body-parser` - Parse JSON request bodies
- `uuid` - Generate unique session IDs
#### Step 1.2: Create Database Schema
- [ ] Create `database.js` file
- [ ] Define SQLite database initialization
- [ ] Create `sessions` table with schema:
```sql
CREATE TABLE IF NOT EXISTS sessions (
id TEXT PRIMARY KEY,
date TEXT NOT NULL,
muscle_groups TEXT NOT NULL
);
```
- [ ] Implement database connection management
- [ ] Add error handling for database operations
#### Step 1.3: Build API Endpoints
- [ ] Create `server.js` with Express setup
- [ ] Implement `GET /api/sessions` - Fetch all sessions
- [ ] Implement `POST /api/sessions` - Create new session
- Validate date format
- Validate muscle_groups array
- Generate unique ID
- [ ] Implement `PUT /api/sessions/:id` - Update session
- Validate session exists
- Validate input data
- [ ] Implement `DELETE /api/sessions/:id` - Delete session
- [ ] Add error handling and appropriate HTTP status codes
- [ ] Enable CORS for frontend access
#### Step 1.4: Test Backend API
- [ ] Test each endpoint with curl or Postman
- [ ] Verify data persistence in SQLite
- [ ] Test edge cases (invalid data, missing sessions, etc.)
### Phase 2: Frontend Development
#### Step 2.1: HTML Structure
- [ ] Create `frontend/index.html`
- [ ] Define semantic HTML structure:
- Header with app title and balance indicator
- "Add Today's Workout" button
- Heatmap container
- Muscle groups dashboard (6 cards)
- Modal/form for adding sessions
- [ ] Include CDN links for Cal-Heatmap
- [ ] Link CSS and JS files
#### Step 2.2: CSS Styling
- [ ] Create `frontend/styles.css`
- [ ] Style header and navigation
- [ ] Style balance indicator (emoji + status text)
- [ ] Style "Add Workout" button
- [ ] Style heatmap container
- [ ] Style muscle group cards:
- Color-coded indicators (green/yellow/red)
- Display days since last trained
- Display training counts
- [ ] Style modal/form for session entry
- [ ] Add responsive design for mobile devices
- [ ] Implement color scheme and typography
#### Step 2.3: API Client Layer
- [ ] Create `frontend/api.js`
- [ ] Implement `fetchSessions()` function
- [ ] Implement `createSession(session)` function
- [ ] Implement `updateSession(id, session)` function
- [ ] Implement `deleteSession(id)` function
- [ ] Add error handling for network requests
- [ ] Add loading states
#### Step 2.4: Core Application Logic
- [ ] Create `frontend/app.js`
- [ ] Initialize application state:
- Sessions array
- Muscle groups configuration
- [ ] Implement session management:
- Load sessions on page load
- Add new session functionality
- Edit session functionality
- Delete session functionality
- [ ] Implement data calculation functions:
- Calculate days since last trained per muscle group
- Calculate training frequency (7 days, 30 days)
- Calculate balance indicator score
- [ ] Implement UI update functions:
- Update muscle group cards
- Update balance indicator
- Refresh heatmap
#### Step 2.5: Heatmap Component
- [ ] Create `frontend/heatmap.js`
- [ ] Initialize Cal-Heatmap with configuration:
- Set date range (current year)
- Configure color scheme (green/grey)
- Set domain and subDomain
- [ ] Transform sessions data for Cal-Heatmap format
- [ ] Implement tooltip showing:
- Date
- Muscle groups trained
- [ ] Add navigation controls (previous/next year)
- [ ] Handle click events on heatmap cells
#### Step 2.6: Muscle Groups Dashboard
- [ ] Create `frontend/muscleGroups.js`
- [ ] Define muscle groups configuration:
- Chest, Legs, Delts, Lats, Triceps, Biceps
- [ ] Implement rendering of muscle group cards
- [ ] Calculate and display for each muscle group:
- Days since last trained
- Training count (last 7 days / last 30 days)
- Color-coded status indicator
- [ ] Update cards when sessions change
#### Step 2.7: Balance Indicator
- [ ] Implement balance score calculation logic:
- Happy: All 6 groups trained 2+ times in last 7 days
- Neutral: All 6 groups trained 1+ times in last 7 days
- Angry: Any group not trained in last 7 days
- [ ] Render emoji and status text
- [ ] Update indicator when sessions change
#### Step 2.8: Session Form/Modal
- [ ] Create modal UI for adding/editing sessions
- [ ] Implement form with:
- Date picker (default: today)
- Checkboxes for 6 muscle groups
- Save button
- Cancel button
- [ ] Handle form submission
- [ ] Validate form inputs
- [ ] Clear form after submission
- [ ] Close modal after save
### Phase 3: Docker Configuration
#### Step 3.1: Create Dockerfile
- [ ] Create `Dockerfile` in root directory
- [ ] Use multi-stage build:
- Stage 1: Install Node.js dependencies
- Stage 2: Copy backend and frontend files
- Stage 3: Install and configure Nginx
- [ ] Copy backend files to container
- [ ] Copy frontend files to Nginx html directory
- [ ] Expose ports (80 for Nginx, 3000 for Express)
- [ ] Set up startup command to run both services
#### Step 3.2: Configure Nginx
- [ ] Create `nginx/nginx.conf`
- [ ] Configure Nginx to:
- Serve static files from `/usr/share/nginx/html`
- Proxy `/api/*` requests to Express backend
- Set appropriate headers
- [ ] Configure port 80 for HTTP
#### Step 3.3: Test Docker Build
- [ ] Build Docker image
- [ ] Run container locally
- [ ] Verify frontend loads correctly
- [ ] Verify API endpoints work through Nginx proxy
- [ ] Verify database persistence across container restarts
- [ ] Test complete workflow (add/edit/delete sessions)
### Phase 4: Integration and Testing
#### Step 4.1: End-to-End Testing
- [ ] Test adding multiple sessions
- [ ] Test multiple sessions on same day
- [ ] Test editing sessions
- [ ] Test deleting sessions
- [ ] Verify heatmap updates correctly
- [ ] Verify muscle group stats update correctly
- [ ] Verify balance indicator changes appropriately
#### Step 4.2: Edge Case Testing
- [ ] Test with empty database (first use)
- [ ] Test with many sessions (performance)
- [ ] Test date boundaries (year transitions)
- [ ] Test all muscle groups selected
- [ ] Test no muscle groups selected (validation)
- [ ] Test invalid date inputs
#### Step 4.3: UI/UX Polish
- [ ] Review and improve styling
- [ ] Add loading indicators
- [ ] Add success/error messages
- [ ] Improve mobile responsiveness
- [ ] Test across different browsers
- [ ] Optimize performance
### Phase 5: Documentation and Deployment
#### Step 5.1: Create README
- [ ] Write `README.md` with:
- Project overview
- Prerequisites (Docker installed)
- Installation instructions
- Usage instructions
- Docker commands reference
- Backup recommendations
- Troubleshooting guide
#### Step 5.2: Deployment Preparation
- [ ] Document Docker build process
- [ ] Document port configuration
- [ ] Document volume mount for data persistence
- [ ] Create startup scripts if needed
- [ ] Document environment variables
#### Step 5.3: Final Review
- [ ] Code review and cleanup
- [ ] Remove console.logs and debug code
- [ ] Optimize bundle size
- [ ] Verify all PRD requirements met
- [ ] Test final Docker image
## Development Order Recommendation
**Recommended sequence for building:**
1. **Backend First** (Phase 1)
- Build and test API independently
- Ensures data layer is solid before frontend
2. **Frontend Core** (Phase 2.1-2.4)
- HTML structure and basic styling
- API client and core logic
- Can test with mock data initially
3. **Frontend Components** (Phase 2.5-2.8)
- Heatmap integration
- Muscle groups dashboard
- Balance indicator
- Session form
4. **Docker Integration** (Phase 3)
- Containerize application
- Configure Nginx proxy
5. **Testing & Polish** (Phase 4-5)
- End-to-end testing
- Documentation
- Final deployment preparation
## Key Technical Decisions
### Database Design
- **Single table:** Simple schema with JSON-encoded muscle_groups array
- **Text IDs:** Using UUIDs for session identification
- **Date format:** ISO 8601 string format (YYYY-MM-DD) for consistency
### Frontend Architecture
- **Modular files:** Separate concerns (app logic, heatmap, muscle groups, API)
- **No build process:** Vanilla JS served directly
- **Cal-Heatmap:** Mature library for heatmap visualization
### Docker Strategy
- **Single container:** Both Nginx and Express in one container for simplicity
- **Volume mount:** Persistent data storage outside container
- **Nginx proxy:** Clean separation of static and API requests
## Success Criteria
- ✅ Application runs in Docker container
- ✅ All API endpoints function correctly
- ✅ Heatmap displays gym sessions accurately
- ✅ Muscle group tracking calculates correctly
- ✅ Balance indicator shows appropriate status
- ✅ Sessions can be added, edited, and deleted
- ✅ Data persists across container restarts
- ✅ UI is responsive and user-friendly
- ✅ All PRD requirements implemented

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node_modules/

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const sqlite3 = require('sqlite3').verbose();
const path = require('path');
// Database file path
const DB_PATH = path.join(__dirname, '../data/gym-tracker.db');
// Initialize database connection
const db = new sqlite3.Database(DB_PATH, (err) => {
if (err) {
console.error('Error opening database:', err.message);
} else {
console.log('Connected to SQLite database at', DB_PATH);
initializeDatabase();
}
});
// Create tables if they don't exist
function initializeDatabase() {
const createTableSQL = `
CREATE TABLE IF NOT EXISTS sessions (
id TEXT PRIMARY KEY,
date TEXT NOT NULL,
muscle_groups TEXT NOT NULL
)
`;
db.run(createTableSQL, (err) => {
if (err) {
console.error('Error creating sessions table:', err.message);
} else {
console.log('Sessions table ready');
}
});
}
// Get all sessions
function getAllSessions(callback) {
const sql = 'SELECT * FROM sessions ORDER BY date DESC';
db.all(sql, [], (err, rows) => {
if (err) {
callback(err, null);
} else {
// Parse muscle_groups JSON string back to array
const sessions = rows.map(row => ({
id: row.id,
date: row.date,
muscle_groups: JSON.parse(row.muscle_groups)
}));
callback(null, sessions);
}
});
}
// Get session by ID
function getSessionById(id, callback) {
const sql = 'SELECT * FROM sessions WHERE id = ?';
db.get(sql, [id], (err, row) => {
if (err) {
callback(err, null);
} else if (!row) {
callback(null, null);
} else {
const session = {
id: row.id,
date: row.date,
muscle_groups: JSON.parse(row.muscle_groups)
};
callback(null, session);
}
});
}
// Create new session
function createSession(id, date, muscleGroups, callback) {
const sql = 'INSERT INTO sessions (id, date, muscle_groups) VALUES (?, ?, ?)';
const muscleGroupsJSON = JSON.stringify(muscleGroups);
db.run(sql, [id, date, muscleGroupsJSON], function(err) {
if (err) {
callback(err);
} else {
callback(null, { id, date, muscle_groups: muscleGroups });
}
});
}
// Update existing session
function updateSession(id, date, muscleGroups, callback) {
const sql = 'UPDATE sessions SET date = ?, muscle_groups = ? WHERE id = ?';
const muscleGroupsJSON = JSON.stringify(muscleGroups);
db.run(sql, [date, muscleGroupsJSON, id], function(err) {
if (err) {
callback(err);
} else if (this.changes === 0) {
callback(new Error('Session not found'));
} else {
callback(null, { id, date, muscle_groups: muscleGroups });
}
});
}
// Delete session
function deleteSession(id, callback) {
const sql = 'DELETE FROM sessions WHERE id = ?';
db.run(sql, [id], function(err) {
if (err) {
callback(err);
} else if (this.changes === 0) {
callback(new Error('Session not found'));
} else {
callback(null);
}
});
}
// Close database connection
function closeDatabase() {
db.close((err) => {
if (err) {
console.error('Error closing database:', err.message);
} else {
console.log('Database connection closed');
}
});
}
module.exports = {
getAllSessions,
getSessionById,
createSession,
updateSession,
deleteSession,
closeDatabase
};

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{
"name": "gym-tracker-back",
"version": "1.0.0",
"description": "Gym tracker application back-end",
"license": "ISC",
"author": "Roger Oriol",
"type": "commonjs",
"main": "server.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "node server.js"
},
"dependencies": {
"express": "^5.1.0"
}
}

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const express = require('express');
const cors = require('cors');
const { v4: uuidv4 } = require('uuid');
const db = require('./database');
const app = express();
const PORT = process.env.PORT || 3000;
// Middleware
app.use(cors());
app.use(express.json());
// Validation helpers
function isValidDate(dateString) {
const regex = /^\d{4}-\d{2}-\d{2}$/;
if (!regex.test(dateString)) return false;
const date = new Date(dateString);
return date instanceof Date && !isNaN(date);
}
function isValidMuscleGroups(muscleGroups) {
if (!Array.isArray(muscleGroups) || muscleGroups.length === 0) {
return false;
}
const validGroups = ['Chest', 'Legs', 'Delts', 'Lats', 'Triceps', 'Biceps'];
return muscleGroups.every(group => validGroups.includes(group));
}
// API Routes
// GET /api/sessions - Fetch all sessions
app.get('/api/sessions', (req, res) => {
db.getAllSessions((err, sessions) => {
if (err) {
console.error('Error fetching sessions:', err);
return res.status(500).json({ error: 'Failed to fetch sessions' });
}
res.json(sessions);
});
});
// POST /api/sessions - Create new session
app.post('/api/sessions', (req, res) => {
const { date, muscle_groups } = req.body;
// Validation
if (!date) {
return res.status(400).json({ error: 'Date is required' });
}
if (!isValidDate(date)) {
return res.status(400).json({ error: 'Invalid date format. Use YYYY-MM-DD' });
}
if (!muscle_groups) {
return res.status(400).json({ error: 'Muscle groups are required' });
}
if (!isValidMuscleGroups(muscle_groups)) {
return res.status(400).json({
error: 'Invalid muscle groups. Must be a non-empty array containing: Chest, Legs, Delts, Lats, Triceps, Biceps'
});
}
// Generate unique ID
const id = uuidv4();
// Create session
db.createSession(id, date, muscle_groups, (err, session) => {
if (err) {
console.error('Error creating session:', err);
return res.status(500).json({ error: 'Failed to create session' });
}
res.status(201).json(session);
});
});
// PUT /api/sessions/:id - Update session
app.put('/api/sessions/:id', (req, res) => {
const { id } = req.params;
const { date, muscle_groups } = req.body;
// Validation
if (!date) {
return res.status(400).json({ error: 'Date is required' });
}
if (!isValidDate(date)) {
return res.status(400).json({ error: 'Invalid date format. Use YYYY-MM-DD' });
}
if (!muscle_groups) {
return res.status(400).json({ error: 'Muscle groups are required' });
}
if (!isValidMuscleGroups(muscle_groups)) {
return res.status(400).json({
error: 'Invalid muscle groups. Must be a non-empty array containing: Chest, Legs, Delts, Lats, Triceps, Biceps'
});
}
// Update session
db.updateSession(id, date, muscle_groups, (err, session) => {
if (err) {
if (err.message === 'Session not found') {
return res.status(404).json({ error: 'Session not found' });
}
console.error('Error updating session:', err);
return res.status(500).json({ error: 'Failed to update session' });
}
res.json(session);
});
});
// DELETE /api/sessions/:id - Delete session
app.delete('/api/sessions/:id', (req, res) => {
const { id } = req.params;
db.deleteSession(id, (err) => {
if (err) {
if (err.message === 'Session not found') {
return res.status(404).json({ error: 'Session not found' });
}
console.error('Error deleting session:', err);
return res.status(500).json({ error: 'Failed to delete session' });
}
res.status(204).send();
});
});
// Health check endpoint
app.get('/health', (req, res) => {
res.json({ status: 'ok' });
});
// Start server
app.listen(PORT, () => {
console.log(`Server running on port ${PORT}`);
});
// Graceful shutdown
process.on('SIGINT', () => {
console.log('\nShutting down gracefully...');
db.closeDatabase();
process.exit(0);
});

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frontend/index.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Gym tracker</title>
<base href="/">
<meta name="viewport"
content="viewport-fit=cover, width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=5.0">
<meta name="description" content="">
<meta name="keywords" content="">
<meta name="author" content="">
<meta name="application-name" content="">
<meta name="theme-color" content="#33d">
<meta name="color-scheme" content="light dark">
<meta property="og:title" content="" />
<meta property="og:type" content="website" />
<meta property="og:url" content="" />
<meta property="og:image" content="" />
<link rel="canonical" href="" />
<link rel="manifest" href="manifest.json">
<link rel="preload"
href="https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,700;0,900;1,100;1,300;1,400;1,500;1,700;1,900&display=swap"
as="style" onload="this.onload=null;this.rel='stylesheet'">
<link rel="preconnect" href="https://fonts.gstatic.com">
<style>
body {
background: #fefefe;
color: #222;
font-family: 'Roboto', sans-serif;
padding: 1rem;
line-height: 1.8;
}
</style>
<link rel="preload" href="styles.css" as="style" onload="this.onload=null;this.rel='stylesheet'">
<noscript>
<link rel="stylesheet" href="styles.css">
</noscript>
<script>
if ('serviceWorker' in navigator) {
window.addEventListener('load', () => {
navigator.serviceWorker.register('/service-worker.js');
});
}
</script>
<script type="module" src="app.js"></script>
<body>
</body>
</html>

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