# WIA-CORE-010 PHASE 3 Specification
## Multi-Language SDKs and Integrations

**Version:** 1.0.0
**Status:** Active
**Date:** 2025-12-27
**Depends On:** PHASE-1, PHASE-2

---

## 1. Overview

PHASE 3 delivers production-ready SDK implementations for 99 programming languages, enabling universal adoption of WIA-CORE-010 across the entire software ecosystem.

**Objectives:**
- Implement SDKs for 20 Tier-1 languages (full feature parity)
- Provide reference implementations for 30 Tier-2 languages
- Document integration patterns for 49 Tier-3 languages
- Establish SDK quality standards and testing requirements

**Deliverables:**
- 20 production SDKs (Tier-1)
- 30 community SDKs (Tier-2)
- 49 reference implementations (Tier-3)
- Integration guides for popular frameworks
- SDK testing framework

---

## 2. Language Tiers

### 2.1 Tier-1: Full SDK Support (20 languages)

**Criteria:**
- Official WIA-maintained SDK
- 100% feature coverage
- Production-ready quality
- Automated testing and CI/CD
- Published to official package registries
- Regular updates and security patches

**Languages:**
JavaScript, TypeScript, Python, Java, C++, C#, Go, Rust, PHP, Ruby, Swift, Kotlin, Scala, R, Dart, Elixir, Haskell, Erlang, Objective-C, Perl

**Package Names:**
- JavaScript/TypeScript: `@wia/universal-error-handling`
- Python: `wia-error-handling`
- Go: `github.com/wia-official/error-handling-go`
- Rust: `wia-error-handling`
- Java: `dev.wia:error-handling`

### 2.2 Tier-2: Community SDKs (30 languages)

**Criteria:**
- Community-maintained with WIA oversight
- Core features implemented
- Published to package registries
- Community support and contributions

**Languages:**
Julia, Lua, MATLAB, F#, OCaml, Groovy, Clojure, Crystal, Nim, Zig, D, Racket, Elm, PureScript, Reason, ReScript, Solidity, Vyper, Move, Cairo, CoffeeScript, LiveScript, Ballerina, Chapel, Hack, Pony, Red, Ring, V, Wren

### 2.3 Tier-3: Reference Implementations (49 languages)

**Criteria:**
- Basic reference implementation
- Example code and patterns
- Community contributions welcome

**Languages:**
Pascal, Fortran, COBOL, Ada, Lisp, Scheme, Prolog, Assembly, VHDL, Verilog, Bash, PowerShell, Awk, Sed, SQL, PL/SQL, T-SQL, VB.NET, VBA, Delphi, Smalltalk, Koka, Idris, Agda, Coq, Lean, ATS, ML, SML, Vala, Eiffel, Logo, APL, J, K, Q, Forth, PostScript, tcl, Rexx, Alice, Scratch, Blockly, LabVIEW, Simulink, PLC, Ladder Logic, ABAP, ActionScript

---

## 3. SDK Architecture

### 3.1 Core Components

All SDKs MUST implement:

1. **Error Class/Type**
   - Extends native error type
   - Implements WIA error structure
   - Serialization/deserialization

2. **Error Code Enum/Constants**
   - All standard error codes
   - Type-safe code references
   - Documentation strings

3. **Severity Enum**
   - Four severity levels
   - Type-safe severity values

4. **Recovery Strategy Enum**
   - Six recovery strategies
   - Type-safe strategy values

5. **Utility Functions**
   - Error creation helpers
   - Validation functions
   - Serialization utilities

### 3.2 TypeScript SDK Example

```typescript
// @wia/universal-error-handling

export enum Severity {
  CRITICAL = 'CRITICAL',
  ERROR = 'ERROR',
  WARNING = 'WARNING',
  INFO = 'INFO'
}

export enum Recovery {
  RETRY_WITH_BACKOFF = 'RETRY_WITH_BACKOFF',
  FALLBACK = 'FALLBACK',
  CIRCUIT_BREAKER = 'CIRCUIT_BREAKER',
  GRACEFUL_DEGRADATION = 'GRACEFUL_DEGRADATION',
  FAIL_FAST = 'FAIL_FAST',
  MANUAL = 'MANUAL'
}

export class ErrorCode {
  static readonly AUTH_INVALID_001 = 'WIA-AUTH-INVALID-001';
  static readonly DB_TIMEOUT_015 = 'WIA-DB-TIMEOUT-015';
  // ... all standard codes
}

export interface WIAErrorConfig {
  code: string;
  message: string;
  severity: Severity;
  recovery: Recovery;
  context?: Record<string, any>;
  correlationId?: string;
  causedBy?: Error;
}

export class WIAError extends Error {
  public readonly code: string;
  public readonly severity: Severity;
  public readonly recovery: Recovery;
  public readonly timestamp: string;
  public readonly correlationId: string;
  public readonly context: Record<string, any>;
  public readonly causedBy?: Error;

  constructor(config: WIAErrorConfig) {
    super(config.message);
    this.name = 'WIAError';
    this.code = config.code;
    this.severity = config.severity;
    this.recovery = config.recovery;
    this.timestamp = new Date().toISOString();
    this.correlationId = config.correlationId || generateUUID();
    this.context = config.context || {};
    this.causedBy = config.causedBy;
  }

  toJSON(): object {
    return {
      code: this.code,
      message: this.message,
      severity: this.severity,
      recovery: this.recovery,
      timestamp: this.timestamp,
      correlationId: this.correlationId,
      context: this.context,
      stackTrace: this.stack,
      causedBy: this.causedBy ? {
        message: this.causedBy.message,
        stack: this.causedBy.stack
      } : undefined
    };
  }

  static fromJSON(json: string): WIAError {
    const obj = JSON.parse(json);
    return new WIAError({
      code: obj.code,
      message: obj.message,
      severity: obj.severity as Severity,
      recovery: obj.recovery as Recovery,
      context: obj.context,
      correlationId: obj.correlationId
    });
  }
}

// Utility functions
export function retryWithBackoff<T>(
  operation: () => Promise<T>,
  options?: RetryOptions
): Promise<T> {
  // Implementation
}

export class CircuitBreaker {
  // Implementation
}
```

### 3.3 Python SDK Example

```python
# wia-error-handling

from enum import Enum
from typing import Dict, Any, Optional
from datetime import datetime
import uuid
import json

class Severity(Enum):
    CRITICAL = "CRITICAL"
    ERROR = "ERROR"
    WARNING = "WARNING"
    INFO = "INFO"

class Recovery(Enum):
    RETRY_WITH_BACKOFF = "RETRY_WITH_BACKOFF"
    FALLBACK = "FALLBACK"
    CIRCUIT_BREAKER = "CIRCUIT_BREAKER"
    GRACEFUL_DEGRADATION = "GRACEFUL_DEGRADATION"
    FAIL_FAST = "FAIL_FAST"
    MANUAL = "MANUAL"

class ErrorCode:
    AUTH_INVALID_001 = "WIA-AUTH-INVALID-001"
    DB_TIMEOUT_015 = "WIA-DB-TIMEOUT-015"
    # ... all standard codes

class WIAError(Exception):
    def __init__(
        self,
        code: str,
        message: str,
        severity: Severity,
        recovery: Recovery,
        context: Optional[Dict[str, Any]] = None,
        correlation_id: Optional[str] = None,
        caused_by: Optional[Exception] = None
    ):
        super().__init__(message)
        self.code = code
        self.message = message
        self.severity = severity
        self.recovery = recovery
        self.timestamp = datetime.utcnow().isoformat() + 'Z'
        self.correlation_id = correlation_id or str(uuid.uuid4())
        self.context = context or {}
        self.caused_by = caused_by

    def to_dict(self) -> Dict[str, Any]:
        return {
            "code": self.code,
            "message": self.message,
            "severity": self.severity.value,
            "recovery": self.recovery.value,
            "timestamp": self.timestamp,
            "correlationId": self.correlation_id,
            "context": self.context,
            "causedBy": str(self.caused_by) if self.caused_by else None
        }

    def to_json(self) -> str:
        return json.dumps(self.to_dict())

    @classmethod
    def from_json(cls, json_str: str) -> 'WIAError':
        data = json.loads(json_str)
        return cls(
            code=data["code"],
            message=data["message"],
            severity=Severity(data["severity"]),
            recovery=Recovery(data["recovery"]),
            context=data.get("context"),
            correlation_id=data.get("correlationId")
        )
```

---

## 4. Framework Integrations

### 4.1 Express.js (Node.js)

```typescript
import express from 'express';
import { WIAError, Severity } from '@wia/universal-error-handling';

const app = express();

// Error handling middleware
app.use((err: Error, req: express.Request, res: express.Response, next: express.NextFunction) => {
  if (err instanceof WIAError) {
    const statusCode = getHTTPStatus(err.code);
    res.status(statusCode).json({
      error: err.toJSON()
    });
  } else {
    // Convert unknown errors to WIA errors
    const wiaError = new WIAError({
      code: 'WIA-API-INTERNAL-999',
      message: err.message,
      severity: Severity.ERROR,
      recovery: Recovery.MANUAL,
      causedBy: err
    });
    res.status(500).json({
      error: wiaError.toJSON()
    });
  }
});
```

### 4.2 Django (Python)

```python
from django.http import JsonResponse
from wia_error_handling import WIAError, Severity, Recovery

class WIAErrorMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        return self.get_response(request)

    def process_exception(self, request, exception):
        if isinstance(exception, WIAError):
            status_code = get_http_status(exception.code)
            return JsonResponse(
                exception.to_dict(),
                status=status_code
            )
        else:
            wia_error = WIAError(
                code="WIA-API-INTERNAL-999",
                message=str(exception),
                severity=Severity.ERROR,
                recovery=Recovery.MANUAL
            )
            return JsonResponse(
                wia_error.to_dict(),
                status=500
            )
```

---

## 5. SDK Quality Standards

### 5.1 Required Features

- [ ] Error class implementation
- [ ] Standard error code constants
- [ ] Severity and recovery enums
- [ ] JSON serialization/deserialization
- [ ] Validation functions
- [ ] Documentation (API docs, examples)
- [ ] Unit tests (>80% coverage)
- [ ] Integration tests
- [ ] Type definitions (for typed languages)
- [ ] Package registry publication

### 5.2 Testing Requirements

**Unit Tests:**
- Error creation and validation
- Serialization/deserialization
- Error code format validation
- Severity and recovery validation

**Integration Tests:**
- Framework integration (Express, Django, etc.)
- Error propagation
- Correlation ID preservation
- HTTP status code mapping

---

## 6. Distribution

### 6.1 Package Registries

- npm (JavaScript/TypeScript)
- PyPI (Python)
- Maven Central (Java)
- Crates.io (Rust)
- Go Modules (Go)
- NuGet (C#)
- RubyGems (Ruby)
- Packagist (PHP)
- CocoaPods/Swift Package Manager (Swift)

### 6.2 Documentation Sites

- Official docs: https://docs.wia.dev/error-handling
- API reference per language
- Migration guides
- Best practices
- Example applications

---

## 7. Next Steps

PHASE 3 completion enables:
- **PHASE 4:** Advanced features (ML-based recovery, predictive maintenance, ecosystem tools)

---

**Approval:** WIA Standards Committee
**Effective Date:** 2025-12-27
**Review Cycle:** Quarterly