# 🚀 Next Steps - Getting Started with Development

You've successfully completed Sprint 0! Here's what to do next.

---

## 🎯 Immediate Actions (Today)

### 1. Install Dependencies

```bash
# From the root directory
npm install
```

**Expected**: This will take 2-3 minutes. You may see some deprecation warnings (normal).

**On Windows**: If you see `EISDIR` symlink errors, that's okay - dependencies are still installed.

### 2. Start Docker Services

```bash
docker-compose up -d
```

**Expected**: PostgreSQL and Redis containers will start.

**Verify**:
```bash
docker-compose ps

# You should see:
# xpeditis-postgres - Up (healthy)
# xpeditis-redis    - Up (healthy)
```

### 3. Setup Environment Files

```bash
# Backend
cp apps/backend/.env.example apps/backend/.env

# Frontend
cp apps/frontend/.env.example apps/frontend/.env
```

**Note**: Default values work for local development. No changes needed!

### 4. Start the Backend

```bash
# Option 1: From root
npm run backend:dev

# Option 2: From backend directory
cd apps/backend
npm run dev
```

**Expected Output**:
```
╔═══════════════════════════════════════╗
║   🚢 Xpeditis API Server Running     ║
║   API: http://localhost:4000/api/v1  ║
║   Docs: http://localhost:4000/api/docs  ║
╚═══════════════════════════════════════╝
```

**Verify**: Open http://localhost:4000/api/v1/health

### 5. Start the Frontend (New Terminal)

```bash
# Option 1: From root
npm run frontend:dev

# Option 2: From frontend directory
cd apps/frontend
npm run dev
```

**Expected Output**:
```
▲ Next.js 14.0.4
- Local: http://localhost:3000
✓ Ready in 2.3s
```

**Verify**: Open http://localhost:3000

---

## ✅ Verification Checklist

Before proceeding to development, verify:

- [ ] `npm install` completed successfully
- [ ] Docker containers are running (check with `docker-compose ps`)
- [ ] Backend starts without errors
- [ ] Health endpoint returns 200 OK: http://localhost:4000/api/v1/health
- [ ] Swagger docs accessible: http://localhost:4000/api/docs
- [ ] Frontend loads: http://localhost:3000
- [ ] No TypeScript compilation errors

**All green? You're ready to start Phase 1! 🎉**

---

## 📅 Phase 1 - Core Search & Carrier Integration (Next 6-8 weeks)

### Week 1-2: Domain Layer & Port Definitions

**Your first tasks**:

#### 1. Create Domain Entities

Create these files in `apps/backend/src/domain/entities/`:

```typescript
// organization.entity.ts
export class Organization {
  constructor(
    public readonly id: string,
    public readonly name: string,
    public readonly type: 'FREIGHT_FORWARDER' | 'NVOCC' | 'DIRECT_SHIPPER',
    public readonly scac?: string,
    public readonly address?: Address,
    public readonly logoUrl?: string,
  ) {}
}

// user.entity.ts
export class User {
  constructor(
    public readonly id: string,
    public readonly organizationId: string,
    public readonly email: Email, // Value Object
    public readonly role: UserRole,
    public readonly passwordHash: string,
  ) {}
}

// rate-quote.entity.ts
export class RateQuote {
  constructor(
    public readonly id: string,
    public readonly origin: PortCode, // Value Object
    public readonly destination: PortCode, // Value Object
    public readonly carrierId: string,
    public readonly price: Money, // Value Object
    public readonly surcharges: Surcharge[],
    public readonly etd: Date,
    public readonly eta: Date,
    public readonly transitDays: number,
    public readonly route: RouteStop[],
    public readonly availability: number,
  ) {}
}

// More entities: Carrier, Port, Container, Booking
```

#### 2. Create Value Objects

Create these files in `apps/backend/src/domain/value-objects/`:

```typescript
// email.vo.ts
export class Email {
  private constructor(private readonly value: string) {
    this.validate(value);
  }

  static create(value: string): Email {
    return new Email(value);
  }

  private validate(value: string): void {
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    if (!emailRegex.test(value)) {
      throw new InvalidEmailException(value);
    }
  }

  getValue(): string {
    return this.value;
  }
}

// port-code.vo.ts
export class PortCode {
  private constructor(private readonly value: string) {
    this.validate(value);
  }

  static create(value: string): PortCode {
    return new PortCode(value.toUpperCase());
  }

  private validate(value: string): void {
    // UN LOCODE format: 5 characters (CCCCC)
    if (!/^[A-Z]{5}$/.test(value)) {
      throw new InvalidPortCodeException(value);
    }
  }

  getValue(): string {
    return this.value;
  }
}

// More VOs: Money, ContainerType, BookingNumber, DateRange
```

#### 3. Define Ports

**API Ports (domain/ports/in/)** - What the domain exposes:

```typescript
// search-rates.port.ts
export interface SearchRatesPort {
  execute(input: RateSearchInput): Promise<RateQuote[]>;
}

export interface RateSearchInput {
  origin: PortCode;
  destination: PortCode;
  containerType: ContainerType;
  mode: 'FCL' | 'LCL';
  departureDate: Date;
  weight?: number;
  volume?: number;
  hazmat: boolean;
}
```

**SPI Ports (domain/ports/out/)** - What the domain needs:

```typescript
// rate-quote.repository.ts
export interface RateQuoteRepository {
  save(rateQuote: RateQuote): Promise<void>;
  findById(id: string): Promise<RateQuote | null>;
  findByRoute(origin: PortCode, destination: PortCode): Promise<RateQuote[]>;
}

// carrier-connector.port.ts
export interface CarrierConnectorPort {
  searchRates(input: RateSearchInput): Promise<RateQuote[]>;
  checkAvailability(input: AvailabilityInput): Promise<boolean>;
}

// cache.port.ts
export interface CachePort {
  get<T>(key: string): Promise<T | null>;
  set<T>(key: string, value: T, ttl: number): Promise<void>;
  delete(key: string): Promise<void>;
}
```

#### 4. Write Domain Tests

```typescript
// domain/services/rate-search.service.spec.ts
describe('RateSearchService', () => {
  let service: RateSearchService;
  let mockCache: jest.Mocked<CachePort>;
  let mockConnectors: jest.Mocked<CarrierConnectorPort>[];

  beforeEach(() => {
    mockCache = createMockCache();
    mockConnectors = [createMockConnector('Maersk')];
    service = new RateSearchService(mockCache, mockConnectors);
  });

  it('should return cached rates if available', async () => {
    const input = createTestRateSearchInput();
    const cachedRates = [createTestRateQuote()];
    mockCache.get.mockResolvedValue(cachedRates);

    const result = await service.execute(input);

    expect(result).toEqual(cachedRates);
    expect(mockConnectors[0].searchRates).not.toHaveBeenCalled();
  });

  it('should query carriers if cache miss', async () => {
    const input = createTestRateSearchInput();
    mockCache.get.mockResolvedValue(null);
    const carrierRates = [createTestRateQuote()];
    mockConnectors[0].searchRates.mockResolvedValue(carrierRates);

    const result = await service.execute(input);

    expect(result).toEqual(carrierRates);
    expect(mockCache.set).toHaveBeenCalledWith(
      expect.any(String),
      carrierRates,
      900, // 15 minutes
    );
  });

  // Target: 90%+ coverage for domain
});
```

---

## 📚 Recommended Reading Order

Before starting development, read these in order:

1. **[QUICK-START.md](QUICK-START.md)** (5 min)
   - Get everything running

2. **[CLAUDE.md](CLAUDE.md)** (30 min)
   - Understand hexagonal architecture
   - Learn the rules for each layer
   - See complete examples

3. **[apps/backend/README.md](apps/backend/README.md)** (10 min)
   - Backend-specific guidelines
   - Available scripts
   - Testing strategy

4. **[TODO.md](TODO.md)** - Sections relevant to current sprint (20 min)
   - Detailed task breakdown
   - Acceptance criteria
   - Technical specifications

---

## 🛠️ Development Guidelines

### Hexagonal Architecture Rules

**Domain Layer** (`src/domain/`):
- ✅ Pure TypeScript classes
- ✅ Define interfaces (ports)
- ✅ Business logic only
- ❌ NO imports from NestJS, TypeORM, or any framework
- ❌ NO decorators (@Injectable, @Column, etc.)

**Application Layer** (`src/application/`):
- ✅ Import from `@domain/*` only
- ✅ Controllers, DTOs, Mappers
- ✅ Handle HTTP-specific concerns
- ❌ NO business logic

**Infrastructure Layer** (`src/infrastructure/`):
- ✅ Import from `@domain/*` only
- ✅ Implement port interfaces
- ✅ Framework-specific code (TypeORM, Redis, etc.)
- ❌ NO business logic

### Testing Strategy

- **Domain**: 90%+ coverage, test without any framework
- **Application**: 80%+ coverage, test DTOs and mappings
- **Infrastructure**: 70%+ coverage, test with test databases

### Git Workflow

```bash
# Create feature branch
git checkout -b feature/domain-entities

# Make changes and commit
git add .
git commit -m "feat: add Organization and User domain entities"

# Push and create PR
git push origin feature/domain-entities
```

---

## 🎯 Success Criteria for Week 1-2

By the end of Sprint 1-2, you should have:

- [ ] All core domain entities created (Organization, User, RateQuote, Carrier, Port, Container)
- [ ] All value objects created (Email, PortCode, Money, ContainerType, etc.)
- [ ] All API ports defined (SearchRatesPort, CreateBookingPort, etc.)
- [ ] All SPI ports defined (Repositories, CarrierConnectorPort, CachePort, etc.)
- [ ] Domain services implemented (RateSearchService, BookingService, etc.)
- [ ] Domain unit tests written (90%+ coverage)
- [ ] All tests passing
- [ ] No TypeScript errors
- [ ] Code formatted and linted

---

## 💡 Tips for Success

### 1. Start Small
Don't try to implement everything at once. Start with:
- One entity (e.g., Organization)
- One value object (e.g., Email)
- One port (e.g., SearchRatesPort)
- Tests for what you created

### 2. Test First (TDD)
```typescript
// 1. Write the test
it('should create organization with valid data', () => {
  const org = new Organization('1', 'ACME Freight', 'FREIGHT_FORWARDER');
  expect(org.name).toBe('ACME Freight');
});

// 2. Implement the entity
export class Organization { /* ... */ }

// 3. Run the test
npm test

// 4. Refactor if needed
```

### 3. Follow Patterns
Look at examples in CLAUDE.md and copy the structure:
- Entities are classes with readonly properties
- Value objects validate in the constructor
- Ports are interfaces
- Services implement ports

### 4. Ask Questions
If something is unclear:
- Re-read CLAUDE.md
- Check TODO.md for specifications
- Look at the PRD.md for business context

### 5. Commit Often
```bash
git add .
git commit -m "feat: add Email value object with validation"
# Small, focused commits are better
```

---

## 📞 Need Help?

**Documentation**:
- [QUICK-START.md](QUICK-START.md) - Setup issues
- [CLAUDE.md](CLAUDE.md) - Architecture questions
- [TODO.md](TODO.md) - Task details
- [apps/backend/README.md](apps/backend/README.md) - Backend specifics

**Troubleshooting**:
- [INSTALLATION-STEPS.md](INSTALLATION-STEPS.md) - Common issues

**Architecture**:
- Read the hexagonal architecture guidelines in CLAUDE.md
- Study the example flows at the end of CLAUDE.md

---

## 🎉 You're Ready!

**Current Status**: ✅ Sprint 0 Complete
**Next Milestone**: Sprint 1-2 - Domain Layer
**Timeline**: 2 weeks
**Focus**: Create all domain entities, value objects, and ports

**Let's build something amazing! 🚀**

---

*Xpeditis MVP - Maritime Freight Booking Platform*
*Good luck with Phase 1!*