<?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（Token）
     * - api_url：对应功能的服务端地址
     */
    protected $config = [
        //图生文-gemini-2.5-flash-preview
        'imgtotxt' => [
            'api_key' => 'sk-LVcDfTx5SYK6pWiGpfcAN2KA0LunymnMiYSVfzUKQXrjlkZv',
            'api_url' => 'https://chatapi.onechats.top/v1/chat/completions'
        ],
        //文生文-gtp-4
        'txttotxtgtp' => [
            'api_key' => 'sk-fxlawqVtbbQbNW0wInR3E4wsLo5JHozDC2XOHzMa711su6ss',
            'api_url' => 'https://chatapi.onechats.top/v1/chat/completions'
        ],
        //文生文-gemini-2.0-flash
        'txttotxtgemini' => [
            'api_key' => 'sk-cqfCZFiiSIdpDjIHLMBbH6uWfeg7iVsASvlubjrNEmfUXbpX',
            'api_url' => 'https://chatapi.onechats.top/v1/chat/completions'
        ],
        //文生图-dall-e-3
        'txttoimg' => [
            'api_key' => 'sk-MB6SR8qNaTjO80U7HJl4ztivX3zQKPgKVka9oyfVSXIkHSYZ',
            'api_url' => 'https://chatapi.onechats.top/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)
    {
        //方式一
        $data = [
            "model" => "gemini-2.5-flash-preview",
            "messages" => [[
                "role" => "user",
                "content" => [
                    ["type" => "text", "text" => $prompt],
                    ["type" => "image_url", "image_url" => [
                        "url" => $imageUrl,
                        "detail" => "auto"
                    ]]
                ]
            ]],
            "max_tokens" => 1000
        ];
        //方式二
//        $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,$txttotxt_selectedOption)
    {
        if (empty($prompt)) {
            throw new \Exception("Prompt 不允许为空");
        }
        //判断使用模型
        if ($txttotxt_selectedOption === 'gemini-2.0-flash') {
            $data = [
                'model' => 'gemini-2.0-flash',
                'messages' => [
                    ['role' => 'user', 'content' => $prompt]
                ],
                'temperature' => 0.7,
                'max_tokens' => 1024
            ];
            return $this->callApi(
                $this->config['txttotxtgemini']['api_url'],
                $this->config['txttotxtgemini']['api_key'],
                $data
            );
        }else if ($txttotxt_selectedOption === 'gpt-4') {
            $data = [
                'model' => 'gpt-4',
                'messages' => [
                    ['role' => 'user', 'content' => $prompt]
                ],
                'temperature' => 0.7,
                'max_tokens' => 1024
            ];
            return $this->callApi(
                $this->config['txttotxtgtp']['api_url'],
                $this->config['txttotxtgtp']['api_key'],
                $data
            );
        }

    }

    /**
     * 文生图
     *
     * @param string $prompt         提示文本，用于指导图像生成（最长建议 1000 字符）
     * @param string $selectedOption 模型名称，例如 'dall-e-3' 或其他兼容模型
     *
     * 默认参数说明（适用于所有模型）：
     * - n: 1（生成 1 张图）
     * - size: '1024x1024'（标准正方形图像）
     * - quality: 'hd'（高清质量）
     * - style: 'vivid'（鲜明风格）
     *
     * response_format 参数差异：
     * - 若模型为 'dall-e-3'：返回 base64 图像，字段为 `b64_json`
     * - 其他模型默认返回图像 URL，字段为 `url`
     *
     * ⚠️ 注意：使用此方法后，需在 Job/TextToImageJob.php 中按 response_format 判断提取方式：
     *  提取 url 图像
     *        $base64Image = $dalle1024['data'][0]['url'] ?? null;
     *  提取 base64 图像
     *        $base64Image = $dalle1024['data'][0]['b64_json'] ?? null;
     *
     * @return array 返回接口响应，成功时包含 'data' 字段，失败时包含 'error' 信息
     */
    public function callDalleApi($prompt, $selectedOption)
    {
        if ($selectedOption === 'dall-e-3') {
            $data = [
                'prompt'  => $prompt,
                'model'   => $selectedOption,
                'n'       => 1,
                'size'    => '1024x1024',
                'quality' => 'hd',
                'style'   => 'vivid',
                'response_format' => 'b64_json',
            ];
        } else {
            $data = [
                'prompt'  => $prompt,
                'model'   => $selectedOption,
                'n'       => 1,
                'size'    => '1024x1024',
                'quality' => 'hd',
                'style'   => 'vivid',
                'response_format' => 'b64_json',
            ];
        }
        return $this->callApi($this->config['txttoimg']['api_url'],$this->config['txttoimg']['api_key'],$data);
    }


    /**
     * 图生图
     * @param string $prompt 用户输入的文本提示内容
     * @param string $new_image_url 原图
     */
    public function imgtoimgGptApi($prompt, $new_image_url)
    {
        $imgPath = ROOT_PATH . 'public/' . $new_image_url;

        if (!file_exists($imgPath)) {
            return ['code' => 1, 'msg' => '原图不存在：' . $new_image_url];
        }

        // 原图 base64 编码
        $imgData = file_get_contents($imgPath);
        $base64Img = base64_encode($imgData);
        $initImage = 'data:image/png;base64,' . $base64Img;

        //请求参数
        $postData = json_encode([
            'prompt' => $prompt,
            'steps' => 20,
            'cfg_scale' => 7,
            'denoising_strength' => 0.6,
            'width' => 1024,
            'height' => 2048,
//            'width' => 679,
//            'height' => 862,
            'resize_mode' => 2,
            'sampler_name' => 'DPM++ 2M SDE Heun',
            'seed' => -1,
            'inpaint_full_res' => true,
            'inpainting_fill' => 1,
            'init_images' => [$initImage],
            'override_settings' => [
                'sd_model_checkpoint' => 'realisticVisionV51_v51VAE-inpainting.safetensors [f0d4872d24]',
                'sd_vae' => 'anything-v4.5.vae.pt',
                'CLIP_stop_at_last_layers' => 7
            ],
            'override_settings_restore_afterwards' => true // 调用后恢复模型设置
        ]);

        $apiUrl = "http://20.0.17.233:45001/sdapi/v1/img2img";
        $headers = ['Content-Type: application/json'];

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $apiUrl);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_TIMEOUT, 90);
        $response = curl_exec($ch);
        $error = curl_error($ch);
        curl_close($ch);

        if ($error) {
            return ['code' => 1, 'msg' => '请求失败：' . $error];
        }

        $data = json_decode($response, true);
        if (!isset($data['images'][0])) {
            return ['code' => 1, 'msg' => 'API未返回图像数据'];
        }

        return [
            'code' => 0,
            'msg' => '图像生成成功',
            'data' => [
                'url' => $data['images'][0]
            ]
        ];
    }

    /**
     * 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;
        $attempt = 0;
        $lastError = '';
        $httpCode = 0;
        $apiErrorDetail = '';

        while ($attempt <= $maxRetries) {
            try {
                $ch = curl_init();
                curl_setopt_array($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 => true,
                    CURLOPT_SSL_VERIFYHOST => 2,
                    CURLOPT_CONNECTTIMEOUT => 30,
                    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
                    CURLOPT_FAILONERROR => true
                ]);

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

                if ($response === false) {
                    throw new \Exception("请求发送失败: " . $curlError);
                }

                $result = json_decode($response, true);

                // 检查API返回的错误
                if (isset($result['error'])) {
                    $apiErrorDetail = $result['error']['message'] ?? '';
                    $errorType = $result['error']['type'] ?? '';

                    // 常见错误类型映射
                    $errorMessages = [
                        'invalid_request_error' => '请求参数错误',
                        'authentication_error' => '认证失败',
                        'rate_limit_error' => '请求频率过高',
                        'insufficient_quota' => '额度不足',
                        'billing_not_active' => '账户未开通付费',
                        'content_policy_violation' => '内容违反政策'
                    ];

                    $friendlyMessage = $errorMessages[$errorType] ?? 'API服务错误';
                    throw new \Exception("{$friendlyMessage}: {$apiErrorDetail}");
                }

                if ($httpCode !== 200) {
                    // HTTP状态码映射
                    $statusMessages = [
                        400 => '请求参数不合法',
                        401 => 'API密钥无效或权限不足',
                        403 => '访问被拒绝',
                        404 => 'API端点不存在',
                        429 => '请求过于频繁，请稍后再试',
                        500 => '服务器内部错误',
                        503 => '服务暂时不可用'
                    ];

                    $statusMessage = $statusMessages[$httpCode] ?? "HTTP错误({$httpCode})";
                    throw new \Exception($statusMessage);
                }

                curl_close($ch);
                return $result;

            } catch (\Exception $e) {
                $lastError = $e->getMessage();
                $attempt++;
                if ($attempt <= $maxRetries) {
                    sleep(pow(2, $attempt));
                } else {
                    // 最终失败时的详细错误信息
                    $errorDetails = [
                        '错误原因' => $this->getErrorCause($httpCode, $apiErrorDetail),
                        '解决方案' => $this->getErrorSolution($httpCode),
                        '请求参数' => json_encode($data, JSON_UNESCAPED_UNICODE),
                        'HTTP状态码' => $httpCode,
                        '重试次数' => $attempt
                    ];

                    throw new \Exception("API请求失败\n" .
                        "失败说明: " . $errorDetails['错误原因'] . "\n" .
                        "建议解决方案: " . $errorDetails['解决方案'] . "\n" .
                        "技术详情: HTTP {$httpCode} - " . $lastError);
                }
            }
        }
    }

    /**
     * 根据错误类型获取友好的错误原因
     */
    private function getErrorCause($httpCode, $apiError)
    {
        $causes = [
            401 => 'API密钥无效、过期或没有访问权限',
            400 => $apiError ?: '请求参数不符合API要求',
            429 => '已达到API调用频率限制',
            403 => '您的账户可能没有开通相关服务权限',
            500 => 'OpenAI服务器处理请求时出错'
        ];

        return $causes[$httpCode] ?? '未知错误，请检查网络连接和API配置';
    }

    /**
     * 根据错误类型获取解决方案建议
     */
    private function getErrorSolution($httpCode)
    {
        $solutions = [
            401 => '1. 检查API密钥是否正确 2. 确认密钥是否有访问权限 3. 尝试创建新密钥',
            400 => '1. 检查请求参数 2. 验证提示词内容 3. 参考API文档修正参数',
            429 => '1. 等待1分钟后重试 2. 升级账户提高限额 3. 优化调用频率',
            403 => '1. 检查账户状态 2. 确认是否已开通付费 3. 联系OpenAI支持',
            500 => '1. 等待几分钟后重试 2. 检查OpenAI服务状态页'
        ];

        return $solutions[$httpCode] ?? '1. 检查网络连接 2. 查看服务日志 3. 联系技术支持';
    }
}