# Authentication Usage Example
# This file demonstrates how to use the authentication endpoints

import requests
import json

# API Base URL
BASE_URL = "http://localhost:8000"

def register_user(email, username, password):
    """Register a new user"""
    response = requests.post(f"{BASE_URL}/register", json={
        "email": email,
        "username": username,
        "password": password
    })
    return response.json()

def login_user(username, password):
    """Login and get JWT token"""
    response = requests.post(f"{BASE_URL}/login", json={
        "username": username,
        "password": password
    })
    if response.status_code == 200:
        data = response.json()
        return data["access_token"]
    else:
        print(f"Login failed: {response.json()}")
        return None

def get_user_info(token):
    """Get current user info"""
    headers = {"Authorization": f"Bearer {token}"}
    response = requests.get(f"{BASE_URL}/me", headers=headers)
    return response.json()

def get_products(token, skip=0, limit=10):
    """Get products (requires authentication)"""
    headers = {"Authorization": f"Bearer {token}"}
    response = requests.get(f"{BASE_URL}/products?skip={skip}&limit={limit}", headers=headers)
    return response.json()

def create_product(token, product_data):
    """Create a new product (requires authentication)"""
    headers = {"Authorization": f"Bearer {token}"}
    response = requests.post(f"{BASE_URL}/products", json=product_data, headers=headers)
    return response.json()

# Example usage
if __name__ == "__main__":
    # 1. Register a new user
    print("1. Registering new user...")
    try:
        user_result = register_user("test@example.com", "testuser", "password123")
        print(f"User registered: {user_result}")
    except Exception as e:
        print(f"Registration failed: {e}")
    
    # 2. Login with default admin user
    print("\n2. Logging in as admin...")
    admin_token = login_user("admin", "admin123")
    if admin_token:
        print(f"Admin login successful! Token: {admin_token[:50]}...")
        
        # 3. Get user info
        print("\n3. Getting admin user info...")
        user_info = get_user_info(admin_token)
        print(f"User info: {user_info}")
        
        # 4. Create a sample product
        print("\n4. Creating a sample product...")
        sample_product = {
            "product_id": "TEST001",
            "title": "Test Product",
            "description": "A test product for demonstration",
            "price": "19.99",
            "brand": "Test Brand",
            "availability": "in stock"
        }
        
        product_result = create_product(admin_token, sample_product)
        print(f"Product created: {product_result}")
        
        # 5. Get products list
        print("\n5. Getting products list...")
        products = get_products(admin_token)
        print(f"Products: {products}")
    
    # 6. Login with regular user
    print("\n6. Logging in as regular user...")
    user_token = login_user("testuser", "password123")
    if user_token:
        print(f"User login successful! Token: {user_token[:50]}...")
        
        # Regular users can also access protected endpoints
        user_info = get_user_info(user_token)
        print(f"Regular user info: {user_info}")
        
        products = get_products(user_token, limit=5)
        print(f"Products accessible to regular user: {len(products.get('products', []))} products")
    
    print("\nAuthentication example completed!")

# Example cURL commands:
"""
# Register a new user
curl -X POST "http://localhost:8000/register" \
     -H "Content-Type: application/json" \
     -d '{"email": "user@example.com", "username": "newuser", "password": "password123"}'

# Login (get JWT token)
curl -X POST "http://localhost:8000/login" \
     -H "Content-Type: application/json" \
     -d '{"username": "admin", "password": "admin123"}'

# Use token to access protected endpoint
curl -X GET "http://localhost:8000/me" \
     -H "Authorization: Bearer YOUR_JWT_TOKEN_HERE"

# Get products (protected)
curl -X GET "http://localhost:8000/products" \
     -H "Authorization: Bearer YOUR_JWT_TOKEN_HERE"

# Create product (protected)
curl -X POST "http://localhost:8000/products" \
     -H "Authorization: Bearer YOUR_JWT_TOKEN_HERE" \
     -H "Content-Type: application/json" \
     -d '{"product_id": "TEST001", "title": "Test Product", "price": "19.99"}'
"""