# Quick Start Guide - Slice 1
## Get Your Multi-Tenant Platform Running in 15 Minutes

This guide gets Slice 1 up and running quickly so you can test the complete admin → vendor creation → vendor login flow.

## 🎯 What You'll Accomplish

By the end of this guide, you'll be able to:
1. ✅ Login as super admin
2. ✅ Create vendors with auto-generated owner accounts
3. ✅ Login as vendor owner
4. ✅ See vendor-specific dashboard
5. ✅ Verify vendor isolation works

## 📦 Prerequisites Checklist

Before starting, ensure you have:

```bash
# Check Python version (need 3.11+)
python --version

# Check PostgreSQL is running
psql --version

# Check you have the project files
ls main.py  # Should exist
```

## ⚡ 5-Step Setup

### Step 1: Install Dependencies (2 minutes)

```bash
# Create virtual environment
python -m venv venv

# Activate it
source venv/bin/activate  # macOS/Linux
# OR
venv\Scripts\activate  # Windows

# Install requirements
pip install fastapi uvicorn sqlalchemy psycopg2-binary python-jose passlib bcrypt python-multipart
```

### Step 2: Configure Database (3 minutes)

```bash
# Create .env file
cat > .env << 'EOF'
# Database
DATABASE_URL=postgresql://postgres:postgres@localhost:5432/multitenant_ecommerce

# JWT Security
JWT_SECRET_KEY=your-super-secret-key-change-this-in-production-please
JWT_EXPIRE_MINUTES=30

# Server
SERVER_ADDRESS=http://localhost:8000
DEBUG=True
PROJECT_NAME=Multi-Tenant Ecommerce Platform
ALLOWED_HOSTS=["*"]
EOF

# Create database
createdb multitenant_ecommerce

# Or using psql:
# psql -U postgres -c "CREATE DATABASE multitenant_ecommerce;"
```

### Step 3: Initialize Database (3 minutes)

Create `scripts/init_db.py`:

```python
# scripts/init_db.py
import sys
sys.path.append('.')

from app.core.database import Base, engine
from models.database.user import User
from models.database.vendor import Vendor, Role, VendorUser
from middleware.auth import AuthManager

def init_database():
    """Initialize database with tables and admin user"""
    
    print("🔧 Creating database tables...")
    Base.metadata.create_all(bind=engine)
    print("✅ Tables created successfully")
    
    # Create admin user
    from sqlalchemy.orm import Session
    db = Session(bind=engine)
    
    try:
        admin = db.query(User).filter(User.username == "admin").first()
        
        if not admin:
            auth_manager = AuthManager()
            admin = User(
                email="admin@platform.com",
                username="admin",
                hashed_password=auth_manager.hash_password("admin123"),
                role="admin",
                is_active=True
            )
            db.add(admin)
            db.commit()
            print("\n✅ Admin user created:")
            print("   📧 Email: admin@platform.com")
            print("   👤 Username: admin")
            print("   🔑 Password: admin123")
        else:
            print("\nℹ️  Admin user already exists")
        
        print("\n🎉 Database initialization complete!")
        print("\n🚀 Next steps:")
        print("   1. Run: uvicorn main:app --reload")
        print("   2. Visit: http://localhost:8000/static/admin/login.html")
        
    finally:
        db.close()

if __name__ == "__main__":
    init_database()
```

Run it:

```bash
python scripts/init_db.py
```

### Step 4: Create Directory Structure (2 minutes)

```bash
# Create required directories
mkdir -p static/admin
mkdir -p static/vendor
mkdir -p static/js/shared
mkdir -p static/css/admin
mkdir -p static/css/shared
```

Copy the HTML/JS files I created into these directories:
- `static/admin/login.html`
- `static/admin/dashboard.html`
- `static/admin/vendors.html`
- `static/vendor/login.html`
- `static/vendor/dashboard.html`
- `static/js/shared/api-client.js`

### Step 5: Start the Application (1 minute)

```bash
# Start FastAPI server
uvicorn main:app --reload --port 8000
```

You should see:
```
INFO:     Uvicorn running on http://127.0.0.1:8000
INFO:     Application startup complete.
```

## 🧪 Test the Complete Flow (5 minutes)

### Test 1: Admin Login

1. **Open browser**: http://localhost:8000/static/admin/login.html
2. **Login**:
   - Username: `admin`
   - Password: `admin123`
3. **Expected**: Redirected to admin dashboard

### Test 2: Create Vendor

1. **Click**: "Create New Vendor" button
2. **Fill form**:
   ```
   Vendor Code: TECHSTORE
   Name: Tech Store Luxembourg
   Subdomain: techstore
   Owner Email: owner@techstore.com
   (Leave other fields optional)
   ```
3. **Submit**: Click "Create Vendor"
4. **Expected**: Success message with credentials displayed

### Test 3: Copy Vendor Credentials

**IMPORTANT**: Copy these credentials immediately (they're shown only once):

```
Vendor Code: TECHSTORE
Subdomain: techstore
Owner Username: techstore_owner
Owner Email: owner@techstore.com
Temporary Password: [COPY THIS!]
```

### Test 4: Vendor Login (Path-based)

1. **Open new tab**: http://localhost:8000/vendor/techstore/login
2. **Login**:
   - Username: `techstore_owner`
   - Password: [paste the temporary password]
3. **Expected**: Redirected to vendor dashboard
4. **Verify**: Dashboard shows "TECHSTORE Dashboard"

### Test 5: Verify Isolation

1. **Try accessing different vendor**: http://localhost:8000/vendor/otherstore/login
2. **Expected**: "Vendor Not Found" message
3. **Database check**:
   ```sql
   SELECT * FROM vendors WHERE vendor_code = 'TECHSTORE';
   SELECT * FROM users WHERE email = 'owner@techstore.com';
   ```

## ✅ Success Indicators

You know Slice 1 is working when:

- [x] Admin can login and see dashboard
- [x] Admin can create vendors
- [x] Vendor owner credentials are generated
- [x] Vendor owner can login
- [x] Vendor dashboard shows correct vendor context
- [x] Invalid vendor URLs show error message
- [x] Each vendor is completely isolated

## 🐛 Common Issues & Fixes

### Issue: "Module not found" errors

**Fix**:
```bash
pip install -r requirements.txt
# Or install missing packages individually
pip install fastapi sqlalchemy psycopg2-binary
```

### Issue: Database connection fails

**Fix**:
```bash
# Check PostgreSQL is running
sudo service postgresql status

# Check database exists
psql -U postgres -l | grep multitenant

# Update DATABASE_URL in .env to match your setup
```

### Issue: "401 Unauthorized" in browser console

**Fix**:
```javascript
// Open browser console (F12)
// Check token exists:
localStorage.getItem('admin_token')

// If null, login again
// If exists but still fails, token might be expired - login again
```

### Issue: Admin login redirects to login page

**Fix**:
```bash
# Check admin user exists in database:
psql -U postgres -d multitenant_ecommerce -c "SELECT * FROM users WHERE role='admin';"

# If no results, run:
python scripts/init_db.py
```

### Issue: Vendor context not detected

**Fix**:
Check URL format:
- ✅ Correct: `localhost:8000/vendor/techstore/login`
- ❌ Wrong: `localhost:8000/techstore/login`
- ❌ Wrong: `localhost:8000/vendor/login`

### Issue: Static files not loading (404)

**Fix**:
```python
# Verify main.py has static file mounting:
from fastapi.staticfiles import StaticFiles

app.mount("/static", StaticFiles(directory="static"), name="static")
```

## 📊 Database Verification

Check everything was created correctly:

```sql
-- Connect to database
psql -U postgres -d multitenant_ecommerce

-- Check tables
\dt

-- Check admin user
SELECT id, username, email, role FROM users WHERE role = 'admin';

-- Check created vendor
SELECT id, vendor_code, name, subdomain, is_active, is_verified 
FROM vendors;

-- Check vendor owner
SELECT id, username, email, role 
FROM users WHERE email LIKE '%techstore%';

-- Check default roles were created
SELECT id, name, vendor_id 
FROM roles 
WHERE vendor_id = (SELECT id FROM vendors WHERE vendor_code = 'TECHSTORE');
```

Expected results:
- 1 admin user
- 1 vendor (TECHSTORE)
- 1 vendor owner user
- 4 roles (Owner, Manager, Editor, Viewer)

## 🎯 Next Steps

Once Slice 1 is working:

### Option 1: Create More Vendors

Test multi-tenancy by creating multiple vendors:
1. Create `FASHIONSTORE` vendor
2. Create `BOOKSHOP` vendor
3. Verify each has isolated login and dashboard

### Option 2: Proceed to Slice 2

Move on to **Slice 2: Marketplace Product Import**:
- Implement CSV import functionality
- Create MarketplaceProduct staging table
- Build import UI
- Add Celery for background processing

### Option 3: Customize UI

Enhance the frontend:
- Add custom CSS themes
- Improve dashboard widgets
- Add vendor statistics
- Build team management UI

## 📚 Quick Reference

### Important URLs

```
Admin Portal:
- Login: http://localhost:8000/static/admin/login.html
- Dashboard: http://localhost:8000/static/admin/dashboard.html
- Create Vendor: http://localhost:8000/static/admin/vendors.html

Vendor Portal (Path-based):
- Login: http://localhost:8000/vendor/{subdomain}/login
- Dashboard: http://localhost:8000/vendor/{subdomain}/dashboard

API Documentation:
- Swagger UI: http://localhost:8000/docs
- ReDoc: http://localhost:8000/redoc
- Health Check: http://localhost:8000/health
```

### Key API Endpoints

```bash
# Authentication
POST /api/v1/auth/login          # Login (admin or vendor)
POST /api/v1/auth/register       # Register new user
GET  /api/v1/auth/me             # Get current user info

# Admin - Vendors
POST /api/v1/admin/vendors       # Create vendor with owner
GET  /api/v1/admin/vendors       # List all vendors
GET  /api/v1/admin/vendors/{id}  # Get vendor details
PUT  /api/v1/admin/vendors/{id}/verify   # Verify vendor
PUT  /api/v1/admin/vendors/{id}/status   # Toggle active status

# Admin - Users
GET  /api/v1/admin/users         # List all users
PUT  /api/v1/admin/users/{id}/status     # Toggle user status

# Admin - Dashboard
GET  /api/v1/admin/dashboard     # Get dashboard stats
GET  /api/v1/admin/stats/users   # User statistics
GET  /api/v1/admin/stats/vendors # Vendor statistics
```

### Testing with cURL

```bash
# Login as admin
curl -X POST http://localhost:8000/api/v1/auth/login \
  -H "Content-Type: application/json" \
  -d '{"username":"admin","password":"admin123"}'

# Save the token
TOKEN="your_token_here"

# Create vendor
curl -X POST http://localhost:8000/api/v1/admin/vendors \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $TOKEN" \
  -d '{
    "vendor_code": "TESTSHOP",
    "name": "Test Shop",
    "subdomain": "testshop",
    "owner_email": "owner@testshop.com"
  }'

# Get all vendors
curl -X GET http://localhost:8000/api/v1/admin/vendors \
  -H "Authorization: Bearer $TOKEN"
```

### Browser Console Testing

```javascript
// In browser console (F12), test API calls:

// Login
fetch('/api/v1/auth/login', {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({username: 'admin', password: 'admin123'})
})
.then(r => r.json())
.then(d => {
  localStorage.setItem('admin_token', d.access_token);
  console.log('Logged in!', d);
});

// Create vendor
const token = localStorage.getItem('admin_token');
fetch('/api/v1/admin/vendors', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': `Bearer ${token}`
  },
  body: JSON.stringify({
    vendor_code: 'MYSHOP',
    name: 'My Shop',
    subdomain: 'myshop',
    owner_email: 'owner@myshop.com'
  })
})
.then(r => r.json())
.then(d => console.log('Vendor created!', d));
```

## 🔒 Security Notes

### For Development

Current setup uses:
- ✅ JWT tokens with bcrypt password hashing
- ✅ HttpOnly would be recommended for production cookies
- ✅ CORS middleware configured
- ⚠️ Default admin password (change immediately!)
- ⚠️ DEBUG=True (disable in production)

### For Production

Before going live:

1. **Change default credentials**:
   ```sql
   UPDATE users SET hashed_password = 'new_hash' WHERE username = 'admin';
   ```

2. **Update environment variables**:
   ```bash
   DEBUG=False
   JWT_SECRET_KEY=[generate strong random key]
   ALLOWED_HOSTS=["yourdomain.com"]
   ```

3. **Enable HTTPS**:
   - Use nginx/apache with SSL certificates
   - Force HTTPS redirects
   - Set secure cookie flags

4. **Set up subdomain routing**:
   - Configure DNS wildcards: `*.platform.com`
   - Update nginx to route subdomains
   - Test subdomain detection

## 📝 File Checklist

Ensure you have all these files:

```
✅ Backend Core:
- main.py
- app/core/config.py
- app/core/database.py
- app/api/main.py
- app/api/deps.py

✅ Models:
- models/database/user.py
- models/database/vendor.py
- models/database/base.py
- models/schemas/auth.py
- models/schemas/vendor.py

✅ Services:
- app/services/admin_service.py
- app/services/auth_service.py
- app/services/vendor_service.py

✅ Middleware:
- middleware/auth.py
- middleware/vendor_context.py

✅ API Endpoints:
- app/api/v1/admin.py
- app/api/v1/auth.py
- app/api/v1/vendor/vendor.py

✅ Frontend:
- static/admin/login.html
- static/admin/dashboard.html
- static/admin/vendors.html
- static/vendor/login.html
- static/vendor/dashboard.html
- static/js/shared/api-client.js

✅ Scripts:
- scripts/init_db.py

✅ Configuration:
- .env
- requirements.txt
```

## 🎉 Congratulations!

If you've made it here and everything works, you've successfully implemented **Slice 1** of your multi-tenant ecommerce platform!

### What You've Built

✅ **Multi-tenant foundation** with complete vendor isolation  
✅ **Admin portal** for platform management  
✅ **Vendor creation** with automatic owner account generation  
✅ **Context detection** supporting both subdomain and path-based routing  
✅ **Secure authentication** with JWT tokens  
✅ **Role-based access control** separating admin and vendor users  
✅ **Database schema** with proper relationships  
✅ **Clean architecture** following the vertical slice approach  

### Ready for Production Features

Your platform now has:
- 🔐 Secure authentication system
- 🏪 Vendor account management
- 👥 User role system
- 🎨 Modern, responsive UI
- 📊 Dashboard with statistics
- 🔄 Vendor context isolation
- 🚀 Scalable architecture

## 📞 Need Help?

If you encounter issues:

1. **Check logs**: Look at terminal output for errors
2. **Check browser console**: F12 → Console tab
3. **Check database**: Use psql to verify data
4. **Review this guide**: Most issues covered above
5. **Check documentation**: See SLICE_1_IMPLEMENTATION_GUIDE.md

## 🚀 What's Next?

You're now ready for **Slice 2**! Here's what's coming:

### Slice 2: Vendor Imports Products from Letzshop
- CSV file import from marketplace
- MarketplaceProduct staging table
- Product import UI with file upload
- Background job processing with Celery
- Import history and status tracking

### Future Slices
- **Slice 3**: Product catalog management and publishing
- **Slice 4**: Customer shopping experience
- **Slice 5**: Order processing and payments

---

**Happy coding!** 🎉 You've built a solid foundation for your multi-tenant ecommerce platform!