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# Coding Standards
- category: coding
- priority: critical

## Overview
Core coding standards and best practices for the project.

## Go-Specific Standards
- Follow Go naming conventions (camelCase, PascalCase)
- Use `gofmt` for code formatting
- Handle errors explicitly, don't ignore them
- Use interfaces for abstraction

## Error Handling
- Always check and handle errors
- Use structured error types
- Wrap errors with context using `fmt.Errorf`
- Return meaningful error messages

## Testing
- Write unit tests for all public functions
- Use table-driven tests for multiple test cases
- Achieve minimum 80% code coverage

# Architecture Patterns
- category: architecture
- priority: critical

## Design Principles
- **Single Responsibility**: Each component has one reason to change
- **Dependency Inversion**: Depend on abstractions, not concretions

## Recommended Patterns

### Repository Pattern
- Encapsulate data access logic
- Provide consistent interface for data operations
- Enable easy testing with mock implementations

### Layered Architecture
┌─────────────────────┐
│   Presentation      │  ← HTTP handlers, CLI
├─────────────────────┤
│   Business Logic    │  ← Domain models, use cases
├─────────────────────┤
│   Data Access       │  ← Repositories, databases
└─────────────────────┘

# API Documentation
- category: architecture
- tags: api, rest, authentication

## Authentication Endpoints

### POST /auth/login
**Request:**
```json
{
  "email": "user@example.com",
  "password": "secure_password"
}

{
  "token": "jwt_token_here",
  "user": {
    "id": 123,
    "email": "user@example.com",
    "role": "user"
  }
}

{
  "user": {
    "id": 123,
    "email": "user@example.com",
    "role": "user"
  }
}

{
  "error": "error_code",
  "message": "Human readable message"
}

</details>

---

### ✅ Todo Files

> **Location:** `.buddy/todos/`  
> **Purpose:** Track tasks, features, and project progress

#### 📝 Format Requirements
- ✅ Use markdown format (`.md`)
- ✅ Use checkbox syntax: `- [ ]` (incomplete) or `- [x]` (complete)
- ✅ Group related tasks under clear headings
- ✅ Include context and details for each task

#### 🔐 Example: Feature Development

<details>
<summary>Click to expand feature development example</summary>

```markdown
# Authentication Feature

## Backend Implementation
- [x] Set up JWT library
- [x] Create user model and database migration
- [x] Implement password hashing with bcrypt
- [ ] Create login endpoint
- [ ] Create registration endpoint
- [ ] Add middleware for protected routes
- [ ] Write unit tests for auth service
- [ ] Add integration tests for auth endpoints

## Frontend Implementation
- [ ] Create login form component
- [ ] Create registration form component
- [ ] Implement JWT token storage
- [ ] Add authentication context
- [ ] Create protected route wrapper
- [ ] Handle token refresh logic

## Security & Testing
- [ ] Add rate limiting to auth endpoints
- [ ] Implement account lockout after failed attempts
- [ ] Add password strength validation
- [ ] Security audit of auth implementation
- [ ] Load testing for auth endpoints

-- Users table
CREATE TABLE users (
    id SERIAL PRIMARY KEY,
    email VARCHAR(255) UNIQUE NOT NULL,
    password_hash VARCHAR(255) NOT NULL,
    role VARCHAR(50) DEFAULT 'user',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Sessions table for JWT blacklisting
CREATE TABLE sessions (
    id SERIAL PRIMARY KEY,
    user_id INTEGER REFERENCES users(id) ON DELETE CASCADE,
    token_hash VARCHAR(255) UNIQUE NOT NULL,
    expires_at TIMESTAMP NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Indexes for performance
CREATE INDEX idx_users_email ON users(email);
CREATE INDEX idx_sessions_token_hash ON sessions(token_hash);
CREATE INDEX idx_sessions_expires_at ON sessions(expires_at);