peikarband/docs/handbook.md

# پروژه پیکربند - Handbook جامع

**نسخه**: 1.0.0  
**آخرین بروزرسانی**: 2025-01-24  
**نویسنده**: تیم توسعه پیکربند

---

## فهرست مطالب

1. [معرفی پروژه](#1-معرفی-پروژه)
2. [معماری کلی](#2-معماری-کلی)
3. [قوانین و استانداردها](#3-قوانین-و-استانداردها)
4. [راه‌اندازی محیط توسعه](#4-راهاندازی-محیط-توسعه)
5. [ساختار پروژه](#5-ساختار-پروژه)
6. [Design Patterns](#6-design-patterns)
7. [Best Practices](#7-best-practices)
8. [Testing Strategy](#8-testing-strategy)
9. [Deployment Guide](#9-deployment-guide)
10. [Troubleshooting](#10-troubleshooting)
11. [مستندسازی تغییرات](#11-مستندسازی-تغییرات)

---

## 1. معرفی پروژه

### 1.1 هدف

پیکربند یک پلتفرم جامع مدیریت هاستینگ و زیرساخت ابری است که شامل:

- **هاستینگ وردپرس**: مدیریت حرفه‌ای سایت‌های WordPress
- **فروش دامین**: ثبت و مدیریت دامین‌ها
- **سرورهای اختصاصی**: VPS و Dedicated Servers
- **خدمات DevOps**: مشاوره و پیاده‌سازی
- **پنل مدیریت**: پنل کنترل سفارشی شبیه cPanel

### 1.2 تکنولوژی‌های استفاده شده

| تکنولوژی | نسخه | کاربرد |
|----------|------|--------|
| Python | 3.11+ | زبان اصلی |
| Reflex | 0.4.0 | Frontend/Backend Framework |
| PostgreSQL | 14+ | Database اصلی |
| Redis | 7+ | Cache & Sessions |
| SQLAlchemy | 2.0+ | ORM |
| Celery | 5.3+ | Task Queue |
| pytest | 7.4+ | Testing |

### 1.3 اصول طراحی

#### Clean Architecture
پروژه بر اساس معماری تمیز طراحی شده که شامل 4 لایه اصلی است:

1. **Domain Layer**: منطق کسب‌وکار خالص
2. **Application Layer**: موارد استفاده (Use Cases)
3. **Infrastructure Layer**: جزئیات فنی
4. **Presentation Layer**: رابط کاربری

#### SOLID Principles
- **S**ingle Responsibility Principle
- **O**pen/Closed Principle
- **L**iskov Substitution Principle
- **I**nterface Segregation Principle
- **D**ependency Inversion Principle

#### سایر اصول
- **DRY**: Don't Repeat Yourself
- **KISS**: Keep It Simple, Stupid
- **YAGNI**: You Aren't Gonna Need It
- **Convention over Configuration**

---

## 2. معماری کلی

### 2.1 نمای کلی لایه‌ها

```
┌─────────────────────────────────────────┐
│      Presentation Layer (Reflex UI)     │
│  ┌────────┐  ┌────────┐  ┌────────┐   │
│  │Landing │  │Dashboard│  │ Admin │   │
│  └────────┘  └────────┘  └────────┘   │
└──────────────────┬──────────────────────┘
                   │
┌──────────────────┴──────────────────────┐
│       Application Layer (Use Cases)      │
│  ┌──────┐ ┌──────┐ ┌──────┐ ┌──────┐  │
│  │ Auth │ │Billing│ │Server│ │Ticket│  │
│  └──────┘ └──────┘ └──────┘ └──────┘  │
└──────────────────┬──────────────────────┘
                   │
┌──────────────────┴──────────────────────┐
│     Domain Layer (Business Logic)        │
│  ┌────────┐ ┌────────┐ ┌────────┐     │
│  │Entities│ │ Values │ │Services│     │
│  └────────┘ └────────┘ └────────┘     │
└──────────────────┬──────────────────────┘
                   │
┌──────────────────┴──────────────────────┐
│   Infrastructure Layer (Technical)       │
│  ┌─────┐ ┌─────┐ ┌─────┐ ┌─────┐      │
│  │ DB  │ │Cache│ │ API │ │Tasks│      │
│  └─────┘ └─────┘ └─────┘ └─────┘      │
└─────────────────────────────────────────┘
```

### 2.2 جریان داده

```
User Request → Presentation → Application → Domain
                                            ↓
Infrastructure ← Application ← Domain Logic
                ↓
          External APIs
```

### 2.3 Layer های جزئی

#### Domain Layer
- **Entities**: موجودیت‌های اصلی (User, Service, Invoice, etc.)
- **Value Objects**: اشیاء ارزشی (Email, Money, Phone)
- **Domain Services**: منطق پیچیده دامین
- **Enums**: مقادیر ثابت
- **Exceptions**: خطاهای دامین

#### Application Layer
- **Use Cases**: موارد استفاده سیستم
- **DTOs**: Data Transfer Objects
- **Interfaces**: تعریف رابط‌های سرویس‌ها
- **Validators**: اعتبارسنجی ورودی‌ها

#### Infrastructure Layer
- **Database**: Models و Repositories
- **Cache**: Redis implementation
- **External**: API های خارجی
- **Tasks**: Background jobs
- **Security**: Authentication & Authorization
- **Logging**: Structured logging

#### Presentation Layer
- **Web**: Reflex components و pages
- **API**: REST endpoints (optional)
- **State**: Reflex state management

---

## 3. قوانین و استانداردها

### 3.1 Python Code Style (PEP 8)

#### Naming Conventions

```python
# Classes: PascalCase
class UserService:
    pass

class PaymentGateway:
    pass

# Functions & Methods: snake_case
def create_user(email: str) -> User:
    pass

def process_payment(amount: Decimal) -> PaymentResult:
    pass

# Constants: UPPER_SNAKE_CASE
MAX_LOGIN_ATTEMPTS = 3
DEFAULT_TIMEOUT = 30
API_VERSION = "v1"

# Private methods: _leading_underscore
def _internal_helper():
    pass

# Protected: __double_underscore (name mangling)
class BaseClass:
    def __private_method(self):
        pass

# Variables: snake_case
user_email = "test@example.com"
total_amount = Decimal("100.00")
```

### 3.2 Type Hints (الزامی)

```python
from typing import Optional, List, Dict, Any, Union
from decimal import Decimal

# Function signatures
def get_user_by_id(user_id: int) -> Optional[User]:
    pass

def create_invoice(
    user_id: int,
    amount: Decimal,
    items: List[InvoiceItem]
) -> Invoice:
    pass

# Return types
def get_users(limit: int = 10) -> List[User]:
    pass

def find_service(service_id: int) -> Optional[Service]:
    pass

# Complex types
def process_config(config: Dict[str, Any]) -> bool:
    pass

UserOrNone = Optional[User]
ServiceList = List[Service]
```

### 3.3 Docstrings (Google Style - الزامی)

```python
def create_user(
    email: str,
    password: str,
    full_name: str,
    phone: Optional[str] = None
) -> User:
    """Create a new user account.
    
    This function creates a new user in the system with the provided
    information. Password is automatically hashed before storage.
    
    Args:
        email: User's email address (must be unique)
        password: Plain text password (will be hashed)
        full_name: User's full name
        phone: Optional phone number
        
    Returns:
        User: Created user object
        
    Raises:
        EmailAlreadyExistsException: If email is already registered
        InvalidEmailException: If email format is invalid
        WeakPasswordException: If password doesn't meet requirements
        
    Example:
        >>> user = create_user(
        ...     email="test@example.com",
        ...     password="SecurePass123!",
        ...     full_name="John Doe",
        ...     phone="+989123456789"
        ... )
        >>> print(user.id)
        1
    """
    pass
```

### 3.4 Import Order (با isort)

```python
# 1. Standard library imports
import os
import sys
from typing import Optional, List
from decimal import Decimal
from datetime import datetime

# 2. Third-party imports
import redis
from sqlalchemy import Column, Integer, String
from pydantic import BaseModel

# 3. Local application imports
from src.config.settings import settings
from src.core.domain.entities.user import User
from src.infrastructure.database.repositories.user_repository import UserRepository
```

### 3.5 Error Handling

```python
# ✅ GOOD: Specific exceptions
try:
    user = user_repository.get_by_id(user_id)
    if not user:
        raise UserNotFoundException(f"User {user_id} not found")
except DatabaseException as e:
    logger.error("database_error", error=str(e), user_id=user_id)
    raise
except Exception as e:
    logger.critical("unexpected_error", error=str(e))
    raise InfrastructureException("Internal server error") from e

# ❌ BAD: Generic exceptions
try:
    # code
except:  # Never do this!
    pass

# ❌ BAD: Too broad
try:
    # code
except Exception:
    pass
```

### 3.6 Logging Best Practices

```python
import structlog

logger = structlog.get_logger(__name__)

# ✅ GOOD: Structured logging with context
logger.info(
    "user_created",
    user_id=user.id,
    email=user.email,
    registration_source="web",
    ip_address=request.ip
)

logger.error(
    "payment_failed",
    user_id=user.id,
    invoice_id=invoice.id,
    amount=str(invoice.amount),
    gateway="zarinpal",
    error_code=response.code,
    error_message=response.message
)

# ❌ BAD: String concatenation
logger.info("User " + str(user.id) + " created")
```

---

## 4. راه‌اندازی محیط توسعه

### 4.1 پیش‌نیازها

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

# Check PostgreSQL (14+)
psql --version

# Check Redis (7+)
redis-cli --version

# Check Node.js (18+)
node --version
```

### 4.2 نصب وابستگی‌ها

```bash
# Clone repository
git clone https://github.com/yourusername/peikarband.git
cd peikarband

# Create virtual environment
python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

# Install dependencies
pip install -r requirements.txt
pip install -r requirements-dev.txt

# Install pre-commit hooks
pre-commit install
```

### 4.3 تنظیم Environment Variables

```bash
# Copy example env file
cp .env.example .env

# Edit .env file
nano .env

# Required variables:
# - DATABASE_URL
# - REDIS_URL
# - SECRET_KEY
# - JWT_SECRET_KEY
```

### 4.4 راه‌اندازی دیتابیس

```bash
# Create database
createdb peikarband

# Or using psql
psql -U postgres
CREATE DATABASE peikarband;
\q

# Run migrations
alembic upgrade head

# (Optional) Seed database
python scripts/seed_database.py
```

### 4.5 اجرای پروژه

```bash
# Development mode
python -m reflex run

# With auto-reload
python -m reflex run --reload

# Production mode
python -m reflex run --env prod
```

---

## 5. ساختار پروژه

### 5.1 نمای کلی

```
peikarband/
├── docs/                    # Documentation
├── src/                     # Source code
├── tests/                   # Tests
├── scripts/                 # Utility scripts
├── .github/workflows/       # CI/CD
└── [config files]           # Configuration
```

### 5.2 src/ Structure

```
src/
├── config/                  # Configuration
│   ├── settings.py         # Main settings
│   ├── database.py         # DB config
│   ├── cache.py            # Redis config
│   └── logging.py          # Log config
│
├── core/                    # Core business logic
│   ├── domain/             # Domain layer
│   │   ├── entities/       # Business entities
│   │   ├── value_objects/  # Value objects
│   │   ├── enums/          # Enumerations
│   │   └── exceptions/     # Domain exceptions
│   │
│   ├── application/        # Application layer
│   │   ├── use_cases/      # Use cases
│   │   ├── dto/            # DTOs
│   │   ├── interfaces/     # Service interfaces
│   │   └── validators/     # Validators
│   │
│   └── utils/              # Core utilities
│
├── infrastructure/         # Infrastructure layer
│   ├── database/          # Database implementation
│   ├── cache/             # Cache implementation
│   ├── external/          # External APIs
│   ├── tasks/             # Background tasks
│   ├── security/          # Security utilities
│   └── logging/           # Logging setup
│
├── presentation/          # Presentation layer
│   ├── web/              # Reflex web app
│   │   ├── pages/        # Pages
│   │   ├── components/   # Components
│   │   ├── state/        # State management
│   │   └── styles/       # Styling
│   │
│   └── api/              # REST API (optional)
│
└── shared/               # Shared code
    ├── events/           # Domain events
    └── messaging/        # Event bus
```

---

## 6. Design Patterns

### 6.1 Repository Pattern

```python
from abc import ABC, abstractmethod
from typing import Optional, List

# Interface (in core/application/interfaces/repositories/)
class IUserRepository(ABC):
    @abstractmethod
    def get_by_id(self, user_id: int) -> Optional[User]:
        """Get user by ID."""
        pass
    
    @abstractmethod
    def get_by_email(self, email: str) -> Optional[User]:
        """Get user by email."""
        pass
    
    @abstractmethod
    def save(self, user: User) -> User:
        """Save or update user."""
        pass
    
    @abstractmethod
    def delete(self, user_id: int) -> bool:
        """Delete user."""
        pass

# Implementation (in infrastructure/database/repositories/)
class UserRepository(IUserRepository):
    def __init__(self, session: Session):
        self._session = session
    
    def get_by_id(self, user_id: int) -> Optional[User]:
        model = self._session.query(UserModel).filter_by(id=user_id).first()
        return self._to_entity(model) if model else None
    
    def save(self, user: User) -> User:
        model = self._to_model(user)
        self._session.add(model)
        self._session.commit()
        self._session.refresh(model)
        return self._to_entity(model)
```

### 6.2 Unit of Work Pattern

```python
from contextlib import contextmanager

class UnitOfWork:
    """Manages database transactions."""
    
    def __init__(self, session_factory):
        self.session_factory = session_factory
        self._session = None
    
    def __enter__(self):
        self._session = self.session_factory()
        self.users = UserRepository(self._session)
        self.services = ServiceRepository(self._session)
        return self
    
    def __exit__(self, exc_type, exc_val, exc_tb):
        if exc_type:
            self._session.rollback()
        else:
            self._session.commit()
        self._session.close()

# Usage
with UnitOfWork(SessionLocal) as uow:
    user = uow.users.get_by_id(1)
    user.email = "new@email.com"
    uow.users.save(user)
    # Automatically commits on success
```

### 6.3 Factory Pattern

```python
from abc import ABC, abstractmethod

class ICloudProvider(ABC):
    @abstractmethod
    def create_server(self, config: ServerConfig) -> Server:
        pass

class DigitalOceanProvider(ICloudProvider):
    def create_server(self, config: ServerConfig) -> Server:
        # Implementation
        pass

class HetznerProvider(ICloudProvider):
    def create_server(self, config: ServerConfig) -> Server:
        # Implementation
        pass

class CloudProviderFactory:
    @staticmethod
    def create(provider_type: str) -> ICloudProvider:
        providers = {
            "digitalocean": DigitalOceanProvider,
            "hetzner": HetznerProvider,
            "ovh": OVHProvider,
        }
        
        provider_class = providers.get(provider_type)
        if not provider_class:
            raise ValueError(f"Unknown provider: {provider_type}")
        
        return provider_class()

# Usage
provider = CloudProviderFactory.create("digitalocean")
server = provider.create_server(config)
```

### 6.4 Strategy Pattern

```python
class PaymentStrategy(ABC):
    @abstractmethod
    def pay(self, amount: Decimal) -> PaymentResult:
        pass

class ZarinpalPayment(PaymentStrategy):
    def pay(self, amount: Decimal) -> PaymentResult:
        # Zarinpal implementation
        pass

class IdPayPayment(PaymentStrategy):
    def pay(self, amount: Decimal) -> PaymentResult:
        # IdPay implementation
        pass

class PaymentProcessor:
    def __init__(self, strategy: PaymentStrategy):
        self._strategy = strategy
    
    def process(self, amount: Decimal) -> PaymentResult:
        return self._strategy.pay(amount)

# Usage
processor = PaymentProcessor(ZarinpalPayment())
result = processor.process(Decimal("100.00"))
```

---

## 7. Best Practices

### 7.1 کد تمیز

```python
# ✅ GOOD: Clear and simple
def calculate_total_price(items: List[Item]) -> Decimal:
    """Calculate total price of items."""
    return sum(item.price * item.quantity for item in items)

# ❌ BAD: Too complex
def calc(i):
    t = 0
    for x in i:
        t += x[0] * x[1]
    return t
```

### 7.2 Don't Repeat Yourself (DRY)

```python
# ❌ BAD: Repetition
def get_user_name(user_id: int) -> str:
    session = SessionLocal()
    user = session.query(User).filter_by(id=user_id).first()
    session.close()
    return user.name

def get_user_email(user_id: int) -> str:
    session = SessionLocal()
    user = session.query(User).filter_by(id=user_id).first()
    session.close()
    return user.email

# ✅ GOOD: Reusable
def get_user(user_id: int) -> User:
    with get_db_context() as session:
        return session.query(User).filter_by(id=user_id).first()

def get_user_name(user_id: int) -> str:
    user = get_user(user_id)
    return user.name if user else None
```

### 7.3 Single Responsibility

```python
# ❌ BAD: Multiple responsibilities
class User:
    def save(self):
        # Saves to database
        pass
    
    def send_email(self):
        # Sends email
        pass
    
    def calculate_discount(self):
        # Business logic
        pass

# ✅ GOOD: Separated
class User:
    # Just entity
    pass

class UserRepository:
    def save(self, user: User):
        pass

class EmailService:
    def send_welcome_email(self, user: User):
        pass

class DiscountService:
    def calculate_user_discount(self, user: User):
        pass
```

---

## 8. Testing Strategy

### 8.1 Test Pyramid

```
     /\
    /E2E\      10% - End-to-End Tests
   /------\
  /Integr-\    20% - Integration Tests
 /----------\
/   Unit     \  70% - Unit Tests
```

### 8.2 Unit Test Example

```python
import pytest
from decimal import Decimal

class TestInvoiceCalculation:
    def test_calculate_total_with_items(self):
        # Arrange
        items = [
            InvoiceItem(name="Item 1", price=Decimal("10.00"), quantity=2),
            InvoiceItem(name="Item 2", price=Decimal("5.00"), quantity=3),
        ]
        invoice = Invoice(items=items)
        
        # Act
        total = invoice.calculate_total()
        
        # Assert
        assert total == Decimal("35.00")
    
    def test_calculate_total_empty(self):
        invoice = Invoice(items=[])
        assert invoice.calculate_total() == Decimal("0.00")
```

### 8.3 Integration Test Example

```python
@pytest.mark.integration
class TestUserRepository:
    def test_save_and_retrieve_user(self, db_session):
        # Arrange
        repository = UserRepository(db_session)
        user = User(email="test@example.com", name="Test User")
        
        # Act
        saved_user = repository.save(user)
        retrieved_user = repository.get_by_id(saved_user.id)
        
        # Assert
        assert retrieved_user is not None
        assert retrieved_user.email == "test@example.com"
```

---

## 9. Deployment Guide

### 9.1 Production Checklist

- [ ] همه تست‌ها pass شدند
- [ ] Code coverage بالای 80%
- [ ] Security audit انجام شد
- [ ] Environment variables set شدند
- [ ] Database migrations اجرا شدند
- [ ] Monitoring setup شد
- [ ] Backup strategy تعریف شد
- [ ] SSL certificates نصب شدند
- [ ] Firewall rules تنظیم شدند

---

## 10. Troubleshooting

### 10.1 مشکلات رایج

#### Database Connection Error

**Problem**: `sqlalchemy.exc.OperationalError`

**Solution**:
1. Check DATABASE_URL in .env
2. Verify PostgreSQL is running
3. Check firewall rules
4. Test connection: `psql $DATABASE_URL`

#### Redis Connection Error

**Problem**: `redis.exceptions.ConnectionError`

**Solution**:
1. Check REDIS_URL in .env
2. Verify Redis is running: `redis-cli ping`
3. Check Redis password if set

---

## 11. مستندسازی تغییرات

### 11.1 Commit Message Format

```
<type>(<scope>): <subject>

<body>

<footer>
```

**Types**:
- feat: ویژگی جدید
- fix: رفع باگ
- docs: تغییرات مستندات
- style: فرمت‌بندی
- refactor: بازنویسی
- test: اضافه کردن تست
- chore: کارهای نگهداری

**Example**:
```
feat(auth): add two-factor authentication

- Implement TOTP-based 2FA
- Add QR code generation for authenticator apps
- Add backup codes feature

Closes #123
```

### 11.2 CHANGELOG.md

تمام تغییرات باید در CHANGELOG.md ثبت شود:

```markdown
# Changelog

## [Unreleased]

## [1.0.0] - 2025-01-24

### Added
- User authentication system
- Two-factor authentication
- Password reset functionality

### Changed
- Improved database schema
- Updated UI components

### Fixed
- Payment gateway timeout issue
- Email verification bug
```

---

## پیوست‌ها

### A. فایل‌های مهم

- `docs/architecture/`: معماری سیستم
- `docs/development/`: راهنمای توسعه
- `docs/changelog/`: تاریخچه تغییرات
- `docs/api/`: مستندات API

### B. لینک‌های مفید

- [Python PEP 8](https://pep8.org/)
- [Clean Architecture](https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html)
- [SOLID Principles](https://en.wikipedia.org/wiki/SOLID)

---

**این handbook باید همیشه به‌روز نگه داشته شود.**