class QQTranslator {
	# =========================================================================
	# 成员变量
	# =========================================================================
	
	$secretId = ""
	$secretKey = ""
	$projectId = 0
	$sourceLanguage = "auto"
	$targetLanguage = "zh"
	$region = "ap-hongkong"
	
	
	# =========================================================================
	# 公共成员函数
	# =========================================================================
	
	# 设置 secret Id
	function setSecretId($id)
	{
		$this.secretId = $id
	}
	
	# 设置 secret key
	function setSecretKey($key)
	{
		$this.secretKey = $key
	}
	
	# 设置 project id
	function setProjectId($id)
	{
		$this.projectId = $id
	}
	
	# 指定源语言
	function setSourceLanguage($str)
	{
		$this.sourceLanguage = $str
	}
	
	# 指定目标语言
	function setTargetLanguage($str)
	{
		$this.targetLanguage = $str
	}
	
	# 设置所在地域的服务器
	function setRegion($str)
	{
		$this.region = $str
	}
	
	# 一次翻译一个句子
	function translateString($sourceText)
	{
		
		$secretId = $this.secretId
		$secretKey = $this.secretKey
		$projectId = $this.projectId
		$region = $this.region
		$sourceLanguage = ""
		$targetLanguage = ""
		
		# 取得传入参数的数组
		$count = $args.Length
		
		switch ($count)
		{
			1 {
				# 用户未指定源语言和目标语言
				$sourceLanguage = $this.sourceLanguage
				$targetLanguage = $this.targetLanguage
			}
			2 {
				# 用户未指定目标语言
				$sourceLanguage = $this.sourceLanguage
				$targetLanguage = $args[1]
			}
			3 {
				# 用户同时指定了源语言和目标语言
				$sourceLanguage = $args[1]
				$targetLanguage = $args[2]
			}
		}
		
		$params = @{
			'Action'	 = 'TextTranslate'
			'Region'	 = $region
			'ProjectId'  = $projectId
			'SecretId'   = $secretId
			'Source'	 = $sourceLanguage
			'Target'	 = $targetLanguage
			'SourceText' = $sourceText
			'Timestamp'  = [System.Convert]::ToString((Get-Date).ToUniversalTime().Subtract((Get-Date "1970-01-01")).TotalSeconds)
			'Nonce'	     = [System.Convert]::ToString((Get-Random).Next(1000000))
			'Version'    = '2018-03-21'
			'Signature'  = ''
		}
		
		$params['Signature'] = $this.getReqSign($params, $secretKey)
		$url = 'https://tmt.tencentcloudapi.com/'
		$response = $this.doHttpPost($url, $params)
		$responseArray = $response | ConvertFrom-Json
		
		if ($responseArray.Response.TargetText)
		{
			return $responseArray.Response.TargetText
		}
		elseif ($responseArray.Response.Error)
		{
			$errorCode = $responseArray.Response.Error.Code
			$errorMessage = $responseArray.Response.Error.Message
			return "获取翻译失败。错误代码：$errorCode，错误描述：$errorMessage"
		}
		else
		{
			return "获取翻译失败。未知错误。"
		}
		
	}
	
	# 一次翻译多个句子
	function translateStrings($sourceTextList)
	{
		
		$secretId = $this.secretId
		$secretKey = $this.secretKey
		$projectId = $this.projectId
		$region = $this.region
		$sourceLanguage = ""
		$targetLanguage = ""
		
		# 取得传入参数的数组
		$count = $args.Length
		
		switch ($count)
		{
			1 {
				$sourceLanguage = $this.sourceLanguage
				$targetLanguage = $this.targetLanguage
			}
			2 {
				$sourceLanguage = $this.sourceLanguage
				$targetLanguage = $args[1]
			}
			3 {
				$sourceLanguage = $args[1]
				$targetLanguage = $args[2]
			}
		}
		
		$params = @{
			'Action'    = 'TextTranslateBatch'
			'Region'    = $region
			'ProjectId' = $projectId
			'SecretId'  = $secretId
			'Source'    = $sourceLanguage
			'Target'    = $targetLanguage
			'Timestamp' = [System.Convert]::ToString((Get-Date).ToUniversalTime().Subtract((Get-Date "1970-01-01")).TotalSeconds)
			'Nonce'	    = [System.Convert]::ToString((Get-Random).Next(1000000))
			'Version'   = '2018-03-21'
			'Signature' = ''
		}
		
		$counter = 0
		
		foreach ($sourceText in $sourceTextList)
		{
			$itemName = "SourceTextList.$counter"
			$params[$itemName] = $sourceText
			$counter += 1
		}
		
		$params['Signature'] = $this.getReqSign($params, $secretKey)
		
		$url = 'https://tmt.tencentcloudapi.com/'
		$response = $this.doHttpPost($url, $params)
		$responseArray = $response | ConvertFrom-Json
		
		if ($responseArray.Response.TargetTextList)
		{
			return $responseArray.Response.TargetTextList
		}
		elseif ($responseArray.Response.Error)
		{
			$errorCode = $responseArray.Response.Error.Code
			$errorMessage = $responseArray.Response.Error.Message
			return "获取翻译失败。错误代码：$errorCode，错误描述：$errorMessage"
		}
		else
		{
			return "获取翻译失败。未知错误。"
		}
		
	}
	
	
	# =========================================================================
	# 私有成员函数
	# =========================================================================
	
	# getReqSign ：根据接口请求参数和应用密钥计算请求签名
	function getReqSign($params, $appkey)
	{
		# 对参数排序
		$params = $params.GetEnumerator() | Sort-Object Name
		$signStr = ""
		
		foreach ($param in $params)
		{
			$signStr += $param.Key + "=" + $param.Value
		}
		
		# 拼接签名原文字符串
		$signStr = "POSTtmt.tencentcloudapi.com/?" + $signStr
		
		# 生成签名串
		$hmacsha1 = New-Object System.Security.Cryptography.HMACSHA1
		$byteArray = [System.Text.Encoding]::UTF8.GetBytes($appkey)
		$hmacsha1.Key = $byteArray
		$signBytes = $hmacsha1.ComputeHash([System.Text.Encoding]::UTF8.GetBytes($signStr))
		$sign = [System.Convert]::ToBase64String($signBytes)
		
		return $sign
	}
	
	# doHttpPost ：执行POST请求，并取回响应结果
	function doHttpPost($url, $params)
	{
		$client = New-Object System.Net.WebClient
		$body = [System.Text.Encoding]::UTF8.GetBytes(($params | ConvertTo-Json))
		
		$client.Headers["Content-Type"] = "application/json"
		$response = $client.UploadData($url, "POST", $body)
		
		return [System.Text.Encoding]::UTF8.GetString($response)
	}
	
	# -------------------------------------------------------------------------
}

$translator = [QQTranslator]::new()
$translator.setSecretId("")
$translator.setSecretKey("")
$translator.setProjectId(0)
$translator.setSourceLanguage("auto")
$translator.setTargetLanguage("zh")

$sourceText = "你好"
$translation = $translator.translateString($sourceText)
Write-Host "翻译结果: $translation"
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