orion/docs/project-roadmap/slice_overview.md

Multi-Tenant Ecommerce Platform - Vertical Slices Overview

📋 Development Approach

This project follows a vertical slice development approach, delivering complete, working user workflows incrementally. Each slice is fully functional and provides immediate value.

🎯 Technology Stack

Backend

• Framework: FastAPI (Python 3.11+)
• Database: PostgreSQL with SQLAlchemy ORM
• Authentication: JWT tokens with bcrypt
• Background Jobs: Celery (for async tasks)
• API Documentation: Auto-generated OpenAPI/Swagger

Frontend

• Templating: Jinja2 (server-side rendering)
• JavaScript Framework: Alpine.js v3.x (15KB, CDN-based)
• Styling: Custom CSS with CSS variables
• AJAX: Vanilla JavaScript with Fetch API
• No Build Step: Everything runs directly in the browser

Why Alpine.js + Jinja2?

• ✅ Lightweight: Only 15KB, no build step required
• ✅ Perfect Jinja2 Integration: Works seamlessly with server-side templates
• ✅ Reactive State: Modern UX without framework complexity
• ✅ Scoped Components: Natural vendor isolation
• ✅ Progressive Enhancement: Works even if JS fails
• ✅ Minimal Learning Curve: Feels like inline JavaScript

📚 Slice Documentation Structure

Each slice has its own comprehensive markdown file:

Slice 1: Multi-Tenant Foundation ✅ IN PROGRESS

File: 01_slice1_admin_vendor_foundation.md

• Admin creates vendors through admin interface
• Vendor owner login with context detection
• Complete vendor data isolation
• Status: Backend mostly complete, frontend in progress

Slice 2: Marketplace Integration

File: 02_slice2_marketplace_import.md

• CSV import from Letzshop marketplace
• Background job processing
• Product staging area
• Import status tracking with Alpine.js

Slice 3: Product Catalog Management

File: 03_slice3_product_catalog.md

• Browse imported products in staging
• Select and publish to vendor catalog
• Product customization (pricing, descriptions)
• Inventory management

Slice 4: Customer Shopping Experience

File: 04_slice4_customer_shopping.md

• Public product browsing
• Customer registration/login
• Shopping cart with Alpine.js reactivity
• Product search functionality

Slice 5: Order Processing

File: 05_slice5_order_processing.md

• Checkout workflow
• Order placement
• Order management (vendor side)
• Order history (customer side)

🎯 Slice Completion Criteria

Each slice must pass these gates before moving to the next:

Technical Criteria

• All backend endpoints implemented and tested
• Frontend pages created with Jinja2 templates
• Alpine.js components working (where applicable)
• Database migrations applied successfully
• Service layer business logic complete
• Exception handling implemented
• API documentation updated

Quality Criteria

• Manual testing complete (all user flows)
• Security validation (vendor isolation)
• Performance acceptable (basic load testing)
• No console errors in browser
• Responsive design works on mobile
• Code follows project conventions

Documentation Criteria

• Slice markdown file updated
• API endpoints documented
• Frontend components documented
• Database changes documented
• Testing checklist completed

🗓️ Estimated Timeline

Week 1: Slice 1 - Foundation ⏳ Current

• Days 1-3: Backend completion (vendor context, admin APIs)
• Days 4-5: Frontend completion (admin pages, vendor login)
• Deliverable: Admin can create vendors, vendor owners can log in

Week 2: Slice 2 - Import

• Days 1-3: Import backend (CSV processing, job tracking)
• Days 4-5: Import frontend (upload UI, status tracking)
• Deliverable: Vendors can import products from Letzshop

Week 3: Slice 3 - Catalog

• Days 1-3: Catalog backend (product publishing, inventory)
• Days 4-5: Catalog frontend (product management UI)
• Deliverable: Vendors can manage product catalog

Week 4: Slice 4 - Shopping

• Days 1-3: Customer backend (registration, cart, products)
• Days 4-5: Shop frontend (product browsing, cart)
• Deliverable: Customers can browse and add to cart

Week 5: Slice 5 - Orders

• Days 1-3: Order backend (checkout, order management)
• Days 4-5: Order frontend (checkout flow, order history)
• Deliverable: Complete order workflow functional

📊 Progress Tracking

✅ Completed

• Database schema design
• Core models (User, Vendor, Roles)
• Authentication system
• Admin service layer
• Vendor context detection middleware

🔄 In Progress (Slice 1)

• Admin frontend pages (login, dashboard, vendors)
• Vendor frontend pages (login, dashboard)
• Admin API endpoints refinement
• Frontend-backend integration

📋 Upcoming (Slice 2)

• MarketplaceProduct model
• ImportJob model
• CSV processing service
• Import frontend with Alpine.js

🎨 Frontend Architecture Pattern

Page Structure (Jinja2 + Alpine.js)

{% extends "base.html" %}

{% block content %}
<div x-data="componentName()">
    <!-- Alpine.js reactive component -->
    <h1 x-text="title"></h1>
    
    <!-- Jinja2 for initial data -->
    <script>
        window.initialData = {{ data|tojson }};
    </script>
</div>
{% endblock %}

{% block scripts %}
<script src="/static/js/admin/component.js"></script>
{% endblock %}

Alpine.js Component Pattern

function componentName() {
    return {
        // State
        data: window.initialData || [],
        loading: false,
        error: null,
        
        // Lifecycle
        init() {
            this.loadData();
        },
        
        // Methods
        async loadData() {
            this.loading = true;
            try {
                const response = await apiClient.get('/api/endpoint');
                this.data = response;
            } catch (error) {
                this.error = error.message;
            } finally {
                this.loading = false;
            }
        }
    }
}

🔑 Key Principles

1. Complete Features

Each slice delivers a complete, working feature from database to UI.

2. Vendor Isolation

All slices maintain strict vendor data isolation and context detection.

3. Progressive Enhancement

• HTML works without JavaScript
• Alpine.js enhances interactivity
• Jinja2 provides server-side rendering

4. API-First Design

• Backend exposes RESTful APIs
• Frontend consumes APIs via Fetch
• Clear separation of concerns

5. Clean Architecture

• Service layer for business logic
• Repository pattern for data access
• Exception-first error handling
• Dependency injection

📖 Documentation Files

Slice Files (This Directory)

• 00_slices_overview.md - This file
• 01_slice1_admin_vendor_foundation.md
• 02_slice2_marketplace_import.md
• 03_slice3_product_catalog.md
• 04_slice4_customer_shopping.md
• 05_slice5_order_processing.md

Supporting Documentation

• ../quick_start_guide.md - Get running in 15 minutes
• ../css_structure_guide.txt - CSS organization
• ../css_quick_reference.txt - CSS usage guide
• ../12.project_readme_final.md - Complete project README

🚀 Getting Started

For Current Development (Slice 1)

1. Read 01_slice1_admin_vendor_foundation.md
2. Follow setup in ../quick_start_guide.md
3. Complete Slice 1 testing checklist
4. Move to Slice 2

For New Features

1. Review this overview
2. Read the relevant slice documentation
3. Follow the implementation pattern
4. Test thoroughly before moving forward

💡 Tips for Success

Working with Slices

• ✅ Complete one slice fully before starting the next
• ✅ Test each slice thoroughly
• ✅ Update documentation as you go
• ✅ Commit code after each slice completion
• ✅ Demo each slice to stakeholders

Alpine.js Best Practices

• Keep components small and focused
• Use x-data for component state
• Use x-init for initialization
• Prefer x-show over x-if for toggles
• Use Alpine directives, not vanilla JS DOM manipulation

Jinja2 Best Practices

• Extend base templates
• Use template inheritance
• Pass initial data from backend
• Keep logic in backend, not templates
• Use filters for formatting

🎯 Success Metrics

By End of Slice 1

• Admin can create vendors ✅
• Vendor owners can log in ⏳
• Vendor context detection works ✅
• Complete data isolation verified

By End of Slice 2

• Vendors can import CSV files
• Import jobs tracked in background
• Product staging area functional

By End of Slice 3

• Products published to catalog
• Inventory management working
• Product customization enabled

By End of Slice 4

• Customers can browse products
• Shopping cart functional
• Customer accounts working

By End of Slice 5

• Complete checkout workflow
• Order management operational
• Platform ready for production

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Next Steps: Start with 01_slice1_admin_vendor_foundation.md to continue your current work on Slice 1.