# Bangstack MVP Roadmap

**Goal**: YAML → Working, Tested, Documented App

**Last Updated**: 2025-10-14 (v0.2.5)

## Current Progress (as of v0.2.5)

### ✅ Completed Features

- **Core Infrastructure**:
  - Extended workflow schema with full validation ✅
  - Event-driven architecture ✅
  - YAML parsing with $ref support ✅
  - Version/commit system ✅

- **Generators** (Options 1-3, 5-6):
  - ✅ React Frontend (with custom navigation, protected routes, custom pages/forms)
  - ✅ TypeScript/Express Backend
  - ✅ Drizzle ORM (PostgreSQL migrations)
  - ✅ Docker & Docker Compose
  - ✅ GitHub Actions CI/CD
  - ✅ Environment configuration
  - ✅ Test generator (unit, integration, E2E scaffolding)
  - ✅ Markdown documentation generator
  - ✅ Upstash Redis cache generator

- **CLI Features**:
  - ✅ `bang generate` - Full code generation
  - ✅ `bang validate` - Schema validation with detailed errors
  - ✅ `bang list-generators` - View available generators
  - ✅ `bang create` - Interactive workflow creation
  - ✅ `bang commit/log/show/rollback` - Version management
  - ✅ `bang verify` - Dependency verification

- **Performance**:
  - ✅ Parallel generator execution (2-3x faster)
  - ✅ Lazy loading generators (4.9x faster CLI startup)
  - ✅ Benchmarking suite

- **Documentation**:
  - ✅ 21 comprehensive documentation files
  - ✅ 3 hands-on tutorials
  - ✅ Complete API reference
  - ✅ Performance guide with benchmarks

- **Testing**:
  - ✅ 483 tests, 100% passing
  - ✅ Comprehensive test coverage

### 🔄 In Progress / Needs Work

- **Generators**:
  - ⏳ Multi-framework support (currently focused on React/Express/Drizzle stack)
  - ⏳ Additional integrations (currently has Stripe, SendGrid basics)

- **Quality**:
  - ⏳ 11 minor linting errors to fix

---

## Historical State Assessment

### What We Have ✓

1. **Extended Workflow Schema** (`src/parser/extended-workflow-schema.ts`) ✅
   - Complete Zod validation
   - Technology stack definitions
   - Data models with relationships
   - UI pages, forms, and navigation
   - Design system configuration
   - Authentication and authorization
   - Stages and environments

2. **Event-Driven Schema** (`src/parser/event-driven-schema.ts`) ✅
   - Events, Actors, Components, Workflows, Stack
   - Referential integrity checking

3. **YAML Parser** (`src/parser/workflow-parser.ts`) ✅
   - Parses workflow YAML
   - $ref system for file splitting
   - Reference resolution

4. **Commit System** (`src/commit/`) ✅
   - Version tracking
   - Change history
   - File references

5. **Complete Code Generators** ✅:
   - **Frontend**: React with TypeScript, Tailwind, Vite
     - Full app structure with routing
     - CRUD pages for all models
     - Custom navigation and pages
     - Protected routes with authentication
     - Custom forms with validation
   - **Backend**: TypeScript/Express with Drizzle ORM
     - RESTful API endpoints
     - Database models and relationships
     - Authentication middleware
     - Event bus system
   - **Database**: Drizzle with PostgreSQL
     - Migration generation
     - Schema with relationships
     - Indexes and constraints
   - **Infrastructure**: Docker, Docker Compose, GitHub Actions
   - **Cache**: Upstash Redis integration
   - **Config**: Environment variable templates
   - **Tests**: Unit, integration, and E2E test scaffolding
   - **Docs**: Markdown documentation generation

### What Still Needs Work ⏳

1. **Multi-Framework Support**:
   - Additional frontend frameworks (Vue, Angular, Svelte)
   - Additional backend frameworks (FastAPI, NestJS, Go)
   - Additional databases (MySQL, MongoDB, SQLite)
   - Additional ORMs (Prisma, TypeORM, Mongoose)

2. **Additional Integrations**:
   - More payment processors (PayPal, Klarna beyond basic support)
   - More email providers (Mailgun, Postmark)
   - Analytics providers (Mixpanel, Segment)
   - Authentication providers (Auth0, Firebase, Clerk)

3. **Advanced Test Generation**:
   - Auto-generate actual test implementations (currently scaffolds)
   - Generate test data/fixtures automatically
   - Generate mocks for external services
   - Test coverage reporting integration

4. **Enhanced Documentation**:
   - Auto-generate architecture diagrams
   - Auto-generate event flow diagrams
   - Auto-generate database schema diagrams
   - More detailed API documentation (OpenAPI/Swagger)

5. **Production-Ready Example**:
   - Build a complete real-world app end-to-end
   - Verify all generated code runs without manual fixes
   - Deploy to actual staging/production environments
   - Document any gaps or issues found

---

## Phase 1: Complete the Generators (Core MVP)

**Goal**: Generate a complete, working full-stack app from YAML

### 1.1 Database Generator

**Input**: Components and their data requirements from YAML
**Output**: Database schema, migrations, models

**Tasks**:
- [x] ~~Infer database schema from component events~~ (needs implementation)
- [ ] Generate migrations (PostgreSQL, MySQL, SQLite)
- [ ] Generate ORM models (Prisma, TypeORM, Sequelize)
- [ ] Generate seed data for testing
- [ ] Handle relationships (one-to-many, many-to-many)

**Example**:
```yaml
components:
  products:
    emits: [product_created]
  orders:
    emits: [order_created]
    consumes: [product_added_to_cart]
```

**Generates**:
```sql
-- migrations/001_create_products.sql
CREATE TABLE products (
  id UUID PRIMARY KEY,
  name VARCHAR(255),
  price DECIMAL(10,2),
  created_at TIMESTAMP
);

-- migrations/002_create_orders.sql
CREATE TABLE orders (
  id UUID PRIMARY KEY,
  customer_id UUID,
  total DECIMAL(10,2),
  created_at TIMESTAMP
);
```

### 1.2 Backend API Generator

**Input**: Components, events, workflows from YAML
**Output**: Complete backend API

**Tasks**:
- [ ] Generate API routes from components
- [ ] Generate controllers/handlers
- [ ] Generate middleware (auth, validation)
- [ ] Generate event emitters
- [ ] Support multiple frameworks (Express, FastAPI, Go Gin)
- [ ] Generate API documentation (OpenAPI/Swagger)

**Example**:
```yaml
components:
  products:
    emits: [product_created]

workflows:
  browse_products:
    steps:
      - action: list_products
        component: products
```

**Generates**:
```typescript
// src/routes/products.ts
import { Router } from 'express';

const router = Router();

router.get('/products', async (req, res) => {
  // List products
  const products = await Product.findAll();
  res.json(products);
});

router.post('/products', async (req, res) => {
  // Create product and emit event
  const product = await Product.create(req.body);
  eventBus.emit('product_created', { product });
  res.json(product);
});

export default router;
```

### 1.3 Frontend Application Generator

**Input**: Workflows, actors, components
**Output**: Complete React application

**Tasks**:
- [ ] Generate pages from workflows
- [ ] Generate components from UI needs
- [ ] Generate state management (Context/Redux)
- [ ] Generate API client
- [ ] Generate routing
- [ ] Apply design system (Tailwind/MUI/custom)
- [ ] Support multiple frameworks (React, Vue, Angular)

**Example**:
```yaml
workflows:
  customer_checkout:
    actor: customer
    steps:
      - id: browse_products
        action: view_catalog
      - id: view_cart
        action: review_cart
```

**Generates**:
```typescript
// src/pages/ProductsPage.tsx
export default function ProductsPage() {
  const { products } = useProducts();

  return (
    <div>
      <h1>Products</h1>
      <ProductGrid products={products} />
    </div>
  );
}

// src/pages/CartPage.tsx
export default function CartPage() {
  const { cart } = useCart();

  return (
    <div>
      <h1>Your Cart</h1>
      <CartItems items={cart.items} />
      <CheckoutButton />
    </div>
  );
}
```

### 1.4 Integration Generator

**Input**: Stack configuration
**Output**: Integration code for services

**Tasks**:
- [ ] Generate payment integrations (Stripe, PayPal, Klarna)
- [ ] Generate email integrations (SendGrid, Mailgun)
- [ ] Generate analytics integrations (Mixpanel, Segment)
- [ ] Handle authentication (Auth0, Firebase)
- [ ] Technology-aware (Node vs Python vs Go)

**Example**:
```yaml
stack:
  checkout:
    services:
      stripe:
        type: payment_processor
        config:
          api_key: "{{ env.STRIPE_SECRET_KEY }}"
```

**Generates**:
```typescript
// src/integrations/stripe.ts
import Stripe from 'stripe';

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!, {
  apiVersion: '2023-10-16',
});

export async function createPaymentIntent(amount: number, currency: string) {
  return await stripe.paymentIntents.create({
    amount,
    currency,
  });
}
```

---

## Phase 2: Test Generation

**Goal**: Every generated app has comprehensive tests

### 2.1 Unit Test Generator

**Tasks**:
- [ ] Generate tests for models
- [ ] Generate tests for business logic
- [ ] Generate test fixtures
- [ ] Support multiple frameworks (Jest, Vitest, pytest)

### 2.2 Integration Test Generator

**Tasks**:
- [ ] Generate API endpoint tests
- [ ] Generate database integration tests
- [ ] Generate service integration tests
- [ ] Mock external services appropriately

### 2.3 E2E Test Generator

**Tasks**:
- [ ] Generate Playwright tests from workflows
- [ ] Each workflow step becomes a test scenario
- [ ] Add recording capability for demo videos
- [ ] Generate test data setup/teardown

**Example**:
```yaml
workflows:
  customer_checkout:
    steps:
      - id: add_to_cart
      - id: select_payment
      - id: complete_order
```

**Generates**:
```typescript
// tests/e2e/checkout.spec.ts
test('customer can complete checkout', async ({ page }) => {
  // Add to cart
  await page.goto('/products');
  await page.click('[data-testid="add-to-cart"]');

  // Select payment
  await page.goto('/checkout');
  await page.click('[data-testid="payment-stripe"]');

  // Complete order
  await page.fill('[data-testid="card-number"]', '4242424242424242');
  await page.click('[data-testid="place-order"]');

  // Verify
  await expect(page.locator('[data-testid="order-confirmation"]')).toBeVisible();
});
```

---

## Phase 3: Documentation Generation

**Goal**: Complete, accurate documentation for every app

### 3.1 Architecture Documentation

**Tasks**:
- [ ] Generate system architecture diagram
- [ ] Generate event flow diagram
- [ ] Generate component relationship diagram
- [ ] Generate database schema diagram

### 3.2 API Documentation

**Tasks**:
- [ ] Generate OpenAPI/Swagger specs
- [ ] Generate endpoint descriptions
- [ ] Generate request/response examples
- [ ] Generate authentication guide

### 3.3 User Documentation

**Tasks**:
- [ ] Generate user guides from workflows
- [ ] Generate troubleshooting docs from error conditions
- [ ] Generate prerequisites from step requirements
- [ ] Generate FAQ from common patterns

### 3.4 Developer Documentation

**Tasks**:
- [ ] Generate setup instructions
- [ ] Generate deployment guide
- [ ] Generate "how to add features" guide
- [ ] Generate testing guide

---

## Phase 4: CLI & Workflow

**Goal**: Smooth developer experience

### 4.1 Generation Command

```bash
bang generate [workflow.yaml]
```

**Tasks**:
- [ ] Validate YAML
- [ ] Generate all code
- [ ] Run initial tests
- [ ] Create directory structure
- [ ] Initialize git repo
- [ ] Create .env.example

### 4.2 Stage Management

```bash
bangstack stage [local|staging|production]
bangstack deploy [stage]
```

**Tasks**:
- [ ] Switch between stage configurations
- [ ] Deploy to different environments
- [ ] Run migrations
- [ ] Verify deployment

### 4.3 Versioning Integration

```bash
bang versions
bangstack checkout [version]
bangstack diff [v1] [v2]
```

**Tasks**:
- [ ] Version complete state (config + code)
- [ ] Switch between versions
- [ ] Compare versions
- [ ] Rollback capability

---

## Phase 5: First Real App (Validation)

**Goal**: Build a complete app to validate the entire system

### 5.1 Choose Test Application

**Criteria**:
- Tests all three pillars (Database, API, Design System)
- Multiple workflows (at least 2-3 user journeys)
- Real integrations (payment, email)
- Quick to build (1-2 weeks max)

**Candidates**:
1. **Simple E-commerce Store**
   - Product catalog
   - Shopping cart
   - Checkout with Stripe
   - Order management
   - Email confirmations

2. **Task Management Tool**
   - User authentication
   - Create/edit/delete tasks
   - Assign to team members
   - Status tracking
   - Notifications

3. **Booking System**
   - Calendar view
   - Create bookings
   - Payment processing
   - Confirmation emails
   - Admin management

### 5.2 Write Complete YAML

- [ ] Define all events
- [ ] Define all actors
- [ ] Define all components
- [ ] Define all workflows
- [ ] Define stack configuration
- [ ] Define stages

### 5.3 Generate and Test

- [ ] Run `bang generate`
- [ ] Verify all code generates
- [ ] Run tests
- [ ] Fix generator issues
- [ ] Deploy to staging
- [ ] Deploy to production

### 5.4 Document Learnings

- [ ] What worked well?
- [ ] What was missing?
- [ ] What needs refinement?
- [ ] Update generators based on learnings

---

## Success Metrics

### For MVP

✅ **Can generate a complete app**:
- Database with migrations
- Backend API with all endpoints
- Frontend with all pages
- Tests that pass
- Documentation that's complete

✅ **App actually runs**:
- Starts locally without errors
- All features work
- Tests pass
- Can deploy to staging/production

✅ **Can iterate**:
- Modify YAML
- Regenerate cleanly
- No manual fixes needed
- Documentation stays current

### For First Real App

✅ **Build in < 2 weeks**
✅ **All features work**
✅ **Tests pass**
✅ **Documentation is complete**
✅ **Can hand off to another developer**

---

## Timeline Estimate

**Phase 1 (Generators)**: 4-6 weeks
- Database: 1 week
- Backend API: 2 weeks
- Frontend: 2 weeks
- Integrations: 1 week

**Phase 2 (Tests)**: 2-3 weeks
- Unit tests: 1 week
- Integration tests: 1 week
- E2E tests: 1 week

**Phase 3 (Docs)**: 1-2 weeks
- Architecture docs: 3 days
- API docs: 2 days
- User docs: 3 days
- Developer docs: 2 days

**Phase 4 (CLI)**: 1 week
- Commands: 3 days
- Stage management: 2 days
- Versioning: 2 days

**Phase 5 (Validation)**: 2 weeks
- YAML: 2 days
- Generation: 1 day
- Testing: 3 days
- Refinement: 4 days
- Deployment: 2 days

**Total: 10-14 weeks** (2.5-3.5 months)

---

## Next Steps

1. **Immediate**: Pick one generator to complete fully (recommendation: Database)
2. **Week 1-2**: Get database generation working end-to-end
3. **Week 3-4**: Get backend API generation working
4. **Week 5-6**: Get frontend generation working
5. **Review**: Assess progress, adjust timeline

---

## Notes

- **Iterative approach**: Don't try to make generators perfect initially
- **Start simple**: Support one tech stack well before adding others
- **Test continuously**: Generate code and run it frequently
- **Document as you go**: Keep notes on generator decisions

The AI requirements-to-code layer (REQUIREMENTS-TO-CODE-MODEL.md) comes **after** this MVP is complete and validated.
