# AGENTS.md - Coding Guidelines for WealthWise

## Project Overview

WealthWise is a financial analytics platform with:
- **Frontend**: React + TypeScript + Vite + shadcn/ui + Tailwind CSS
- **Backend**: FastAPI + SQLModel + PostgreSQL + Poetry

## Build & Development Commands

### Frontend (Root Directory)

```bash
# Install dependencies
npm install

# Development server (runs on port 7863)
npm run dev

# Production build
npm run build

# Preview production build
npm run preview

# Lint code
npm run lint

# Deploy to Vercel
npm run deploy      # Production
npm run deploy:dev  # Development
```

### Backend (`/backend` Directory)

```bash
# Install dependencies
poetry install

# Run development server
poetry run uvicorn app.main:app --reload --port 8080

# Run production server
poetry run uvicorn app.main:app --host 0.0.0.0 --port 8080

# Run tests
poetry run pytest
poetry run pytest -v                    # Verbose
poetry run pytest tests/test_auth.py    # Single test file
poetry run pytest -k "test_name"        # Single test by name
poetry run pytest --cov=app             # With coverage

# Format and lint
poetry run black .
poetry run isort .
poetry run flake8
poetry run mypy app/

# Database migrations
cd backend
poetry run alembic revision --autogenerate -m "description"
poetry run alembic upgrade head
poetry run alembic downgrade -1
```

## Code Style Guidelines

### Frontend - TypeScript/React

#### Imports
- Use `@/` path aliases for all internal imports
- Group imports: React → External libraries → Internal (@/lib, @/components) → Relative
- Use single quotes for string literals

```typescript
import React, { useState, useCallback } from 'react';
import { useQuery } from '@tanstack/react-query';
import { Button } from '@/components/ui/button';
import { cn } from '@/lib/utils';
import { useAuth } from '@/hooks/useAuth';
```

#### Components
- Use functional components with arrow functions
- Add displayName for forwarded ref components
- Use `React.FC<Props>` for typing components
- Destructure props in function parameters

```typescript
interface ButtonProps {
  variant?: 'default' | 'outline';
  onClick?: () => void;
}

const Button: React.FC<ButtonProps> = ({ variant = 'default', onClick }) => {
  return <button onClick={onClick}>{children}</button>;
};

Button.displayName = 'Button';
```

#### Naming Conventions
- Components: PascalCase (e.g., `Dashboard.tsx`)
- Hooks: camelCase with `use` prefix (e.g., `useAuth.ts`)
- Utils: camelCase (e.g., `utils.ts`)
- Types/Interfaces: PascalCase (e.g., `User`, `AuthState`)
- CSS Classes: Use Tailwind utility classes with `cn()` helper

#### Styling (Tailwind + shadcn/ui)
- Use `cn()` from `@/lib/utils` for conditional classes
- Follow glassmorphic design with `glass`, `widget` classes
- Use CSS variables from `index.css` for theme colors
- Prefer `rounded-xl`, `rounded-2xl` for border radius

```tsx
<div className={cn(
  "glass-card hover:scale-[1.02] transition-all",
  className
)}>
```

#### Error Handling
- Use try/catch with typed errors
- Check for `err.response?.data?.detail` for API errors
- Set user-friendly error messages in state

#### State Management
- Use React Query for server state
- Use `useState` for local UI state
- Use Context API for auth state

### Backend - Python/FastAPI

#### Imports
- Group: Standard library → Third-party → Local app imports
- Use absolute imports for app modules

```python
import time
from datetime import datetime

from fastapi import FastAPI, HTTPException
from sqlmodel import Session, select

from app.core.config import get_settings
from app.models.user import User
```

#### Naming Conventions
- Files: snake_case (e.g., `auth_service.py`)
- Classes: PascalCase (e.g., `AuthService`)
- Functions/Variables: snake_case (e.g., `get_current_user`)
- Constants: UPPER_SNAKE_CASE

#### Type Hints
- Use type hints on all function parameters and return types
- Use `Optional[Type]` for nullable values
- Use Pydantic models for request/response schemas

```python
def create_user(
    email: str,
    password: str,
    db: Session
) -> Optional[User]:
    """Create a new user."""
    pass
```

#### Docstrings
- Use Google-style docstrings
- Document args, returns, and raises

```python
def validate_token(token: str) -> TokenPayload:
    """Validate JWT token.
    
    Args:
        token: JWT token string
        
    Returns:
        TokenPayload with user information
        
    Raises:
        HTTPException: If token is invalid
    """
```

#### Error Handling
- Use FastAPI's HTTPException with appropriate status codes
- Handle exceptions at router level when possible
- Log errors with context

## Testing

### Frontend
No test framework configured yet. Consider adding Vitest for unit testing.

### Backend
- Tests located in `backend/tests/`
- Use pytest with pytest-asyncio for async tests
- Use TestClient for FastAPI integration tests
- Use `pytest.raises` for exception testing

```python
def test_login_success(client: TestClient):
    response = client.post("/api/v1/auth/login", json={...})
    assert response.status_code == 200
```

## Project Structure

```
/                         # Frontend (Vite + React)
├── src/
│   ├── components/       # React components
│   │   ├── ui/          # shadcn/ui components
│   │   ├── features/    # Feature components
│   │   └── *.tsx        # Shared components
│   ├── hooks/           # Custom React hooks
│   ├── context/         # React context providers
│   ├── lib/             # Utilities, API clients
│   ├── types/           # TypeScript types
│   └── pages/           # Page components
├── public/              # Static assets
└── package.json

/backend/                # FastAPI backend
├── app/
│   ├── api/v1/         # API routes
│   ├── core/           # Config, db, deps
│   ├── models/         # SQLModel models
│   └── schemas/        # Pydantic schemas
├── tests/              # Test files
├── alembic/            # DB migrations
└── pyproject.toml      # Poetry dependencies
```

## Environment Variables

Frontend (`.env`):
- `VITE_API_URL`: Backend API URL

Backend (`.env`):
- `DATABASE_URL`: PostgreSQL connection string
- `SECRET_KEY`: JWT signing key
- `SUPABASE_JWT_SECRET`: Supabase JWT secret
- `DEBUG`: Debug mode flag

## Critical Rules

1. **Never** commit secrets or `.env` files
2. **Always** use TypeScript strict mode compliance
3. **Always** run `npm run lint` before committing frontend changes
4. **Always** run `poetry run black && poetry run flake8` before committing backend changes
5. Use `cn()` for conditional Tailwind classes
6. Use React Query for all API calls
7. Use proper HTTP status codes in backend responses
8. Write docstrings for all public functions
9. Use Pydantic v2 patterns for validation