<?php
namespace app\service;
use think\Db;
use think\Queue;
class AIGatewayService{

    /**
     * 接口访问配置
     *
     * 每个模块包含：
     * - api_key：API 调用密钥（Bearer Token）
     * - api_url：对应功能的服务端地址
     */
    protected $config = [
        //图生文
        'imgtotxt' => [
            'api_key' => 'sk-scyWT2YPrPOIzralcb6WzCeFdAZvl91rh1JcuuaNMrhEJNDZ',
            'api_url' => 'https://niubi.zeabur.app/v1/chat/completions'
        ],
        //文生文
        'txttotxt' => [
            'api_key' => 'sk-Bhos1lXTRpZiAAmN06624a219a874eCd91Dc068b902a3e73',
            'api_url' => 'https://one.opengptgod.com/v1/chat/completions'
        ],
        //文生图
        'txttoimg' => [
            'api_key' => 'sk-e0JuPjMntkbgi1BoMjrqyyzMKzAxILkQzyGMSy3xiMupuoWY',
            'api_url' => 'https://niubi.zeabur.app/v1/images/generations'
        ]
    ];

    /**
     * 图生文
     * @param string $imageUrl 图像 URL，支持公网可访问地址
     * @param string $prompt   对图像的提问内容或提示文本
     */
    public function callGptApi($imageUrl, $prompt)
    {
        $data = [
            "model" => "gemini-2.5-pro-preview-05-06",
            "messages" => [[
                "role" => "user",
                "content" => [
                    ["type" => "text", "text" => $prompt],
                    ["type" => "image_url", "image_url" => [
                        "url" => $imageUrl,
                        "detail" => "auto"
                    ]]
                ]
            ]],
            "max_tokens" => 1000
        ];

        return $this->callApi($this->config['imgtotxt']['api_url'], $this->config['imgtotxt']['api_key'], $data);
    }
//    public function callGptApi($imageUrl, $prompt)
//    {
//        $data = [
//             "model" => "gpt-4-vision-preview",
//            "messages" => [[
//                "role" => "user",
//                "content" => [
//                    ["type" => "text", "text" => $prompt],
//                    ["type" => "image_url", "image_url" => [
//                        "url" => $imageUrl,
//                        "detail" => "auto"
//                    ]]
//                ]
//            ]],
//            "max_tokens" => 1000
//        ];
//        return $this->callApi($this->config['imgtotxt']['api_url'], $this->config['imgtotxt']['api_key'], $data);
//    }

    /**
     * 文生文
     * @param string $prompt 用户输入的文本提示内容
     */
    public function txtGptApi($prompt)
    {
        $data = [
            'prompt' => $prompt,
            'model' => 'gpt-4',
            'session_id' => null,
            'context_reset' => true
        ];
        return $this->callApi(
            $this->config['txttotxt']['api_url'],
            $this->config['txttotxt']['api_key'],
            $data
        );
    }

    /**
     * 文生图
     * @param string $prompt          提示文本，用于指导图像生成
     * @param string $selectedOption  模型名称，例如 'dall-e-3' 或其他兼容模型
     */
    public function callDalleApi($prompt,$selectedOption)
    {
        if($selectedOption == 'dall-e-3'){
            $data = [
                'prompt' => $prompt,
                'model'   => $selectedOption,
                'n'       => 1,
                'size'    => '1024x1024',
                'quality' => 'standard',
                'style'   => 'vivid',
                'response_format' => 'url',
                'session_id' => null,
                'context_reset' => true
            ];
        }else{
            $data = [
                'prompt' => $prompt,
                'model'   => $selectedOption,
                'n'       => 1,
                'size'    => '1024x1024',
                'quality' => 'hd',
                'style'   => 'vivid',
                'response_format' => 'url',
                'session_id' => null,
                'context_reset' => true
            ];
        }

        return $this->callApi($this->config['txttoimg']['api_url'], $this->config['txttoimg']['api_key'], $data);
    }

    /**
     * 通用 API 调用方法（支持重试机制）
     *
     * @param string $url     接口地址
     * @param string $apiKey  授权密钥（Bearer Token）
     * @param array  $data    请求数据（JSON 格式）
     *
     * 功能说明：
     * - 使用 cURL 发送 POST 请求到指定 API 接口
     * - 设置请求头和超时时间等参数
     * - 支持最多重试 2 次，当接口调用失败时自动重试
     * - 返回成功时解析 JSON 响应为数组
     *
     * 异常处理：
     * - 若全部重试失败，将抛出异常并包含最后一次错误信息
     *
     * @return array 接口响应数据（成功时返回解析后的数组）
     * @throws \Exception 接口请求失败时抛出异常
     */
    public function callApi($url, $apiKey, $data)
    {
        $maxRetries = 2;           // 最多重试次数
        $attempt = 0;              // 当前尝试次数
        $lastError = '';           // 最后一次错误信息

        while ($attempt <= $maxRetries) {
            $ch = curl_init();
            curl_setopt_array($ch, [
                CURLOPT_URL => $url,
                CURLOPT_RETURNTRANSFER => true,
                CURLOPT_POST => true,
                CURLOPT_POSTFIELDS => json_encode($data),
                CURLOPT_HTTPHEADER => [
                    'Content-Type: application/json',
                    'Authorization: Bearer ' . $apiKey
                ],
                CURLOPT_TIMEOUT => 120,
                CURLOPT_SSL_VERIFYPEER => false,
                CURLOPT_SSL_VERIFYHOST => 0,
                CURLOPT_TCP_KEEPALIVE => 1,
                CURLOPT_FORBID_REUSE => false
            ]);

            $response = curl_exec($ch);
            $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
            $curlError = curl_error($ch);
            curl_close($ch);

            if ($response !== false && $httpCode === 200) {
                $result = json_decode($response, true);
                return $result;
            }

            $lastError = $curlError ?: "HTTP错误：{$httpCode}";
            $attempt++;
            sleep(1);
        }

        throw new \Exception("请求失败（重试{$maxRetries}次）：{$lastError}");
    }
}