package com.youlai.boot.common.util;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.aliyun.green20220302.Client;
import com.aliyun.green20220302.models.*;
import com.aliyun.teaopenapi.models.Config;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

/**
 * 阿里云内容安全统一审核工具类（v2.0）
 * ----------------------------------------
 * 支持：
 *   1. 文本审核
 *   2. 图片审核
 *   3. 视频审核（异步）
 *   4. 取消视频审核任务（直播流）
 *
 * 特性：
 *   - 自动切换备用节点（cn-beijing）
 *   - 从 application.yml 中读取配置
 *   - 返回 null 表示请求失败（业务层自行判断）
 */
@Slf4j
@Component
public class AliyunContentAuditUtil {

    @Value("${audit.aliyun.green.accessKeyId}")
    private String accessKeyId;

    @Value("${audit.aliyun.green.accessKeySecret}")
    private String accessKeySecret;

    // 主节点（上海）
    private static final String REGION_PRIMARY = "cn-shanghai";
    private static final String ENDPOINT_PRIMARY = "green-cip.cn-shanghai.aliyuncs.com";

    // 备用节点（北京）
    private static final String REGION_BACKUP = "cn-beijing";
    private static final String ENDPOINT_BACKUP = "green-cip.cn-beijing.aliyuncs.com";

    /**
     * 构建客户端
     */
    private Client createClient(boolean useBackup) throws Exception {
        String region = useBackup ? REGION_BACKUP : REGION_PRIMARY;
        String endpoint = useBackup ? ENDPOINT_BACKUP : ENDPOINT_PRIMARY;

        Config config = new Config()
                .setAccessKeyId(accessKeyId)
                .setAccessKeySecret(accessKeySecret)
                .setRegionId(region)
                .setEndpoint(endpoint)
                .setReadTimeout(6000)
                .setConnectTimeout(3000);

        return new Client(config);
    }

    /**
     * 自动调用机制：
     *   - 优先使用上海节点
     *   - 如果响应码为 500 或出现异常，自动切换至北京节点重试一次
     */
    private <T> T executeWithFailover(AliyunRequestExecutor<T> executor) {
        try {
            Client primary = createClient(false);
            T result = executor.execute(primary);
            if (isServerError(result)) {
                log.warn("阿里云内容安全服务端异常，切换到北京节点重试...");
                Client backup = createClient(true);
                return executor.execute(backup);
            }
            return result;
        } catch (Exception e) {
            log.error("阿里云内容安全调用异常（主节点失败），切换至备用节点", e);
            try {
                Client backup = createClient(true);
                return executor.execute(backup);
            } catch (Exception ex) {
                log.error("备用节点调用也失败", ex);
                return null;
            }
        }
    }

    /**
     * 判断是否服务端异常（statusCode=500）
     */
    private boolean isServerError(Object response) {
        try {
            Integer code = (Integer) response.getClass().getMethod("getStatusCode").invoke(response);
            return code != null && code == 500;
        } catch (Exception ignored) {
            return false;
        }
    }

    // ===================== 文本审核 =====================
    public TextModerationResponse textModeration(String content) {
        return executeWithFailover(client -> {
            JSONObject params = new JSONObject();
            params.put("content", content);

            TextModerationRequest request = new TextModerationRequest()
                    .setService("commentDetection")
                    .setServiceParameters(params.toJSONString());

            return client.textModeration(request);
        });
    }

    // ===================== 图片审核 =====================
    public ImageModerationResponse imageModeration(String imageUrl) {
        return executeWithFailover(client -> {
            JSONObject params = new JSONObject();
            JSONArray arr = new JSONArray();
            arr.add(imageUrl);
            params.put("images", arr);

            ImageModerationRequest request = new ImageModerationRequest()
                    .setService("imageDetection")
                    .setServiceParameters(params.toJSONString());

            return client.imageModeration(request);
        });
    }

    // ===================== 视频审核（异步） =====================
    public VideoModerationResponse videoModeration(String videoUrl) {
        return executeWithFailover(client -> {
            JSONObject params = new JSONObject();
            params.put("url", videoUrl);

            VideoModerationRequest request = new VideoModerationRequest()
                    .setService("videoDetection")
                    .setServiceParameters(params.toJSONString());

            return client.videoModeration(request);
        });
    }

    // ===================== 查询视频审核结果 =====================
    public VideoModerationResultResponse videoModerationResult(String taskId) {
        return executeWithFailover(client -> {
            JSONObject params = new JSONObject();
            params.put("taskId", taskId);

            VideoModerationResultRequest request = new VideoModerationResultRequest()
                    .setService("videoDetection")
                    .setServiceParameters(params.toJSONString());

            return client.videoModerationResult(request);
        });
    }

    // ===================== 取消视频任务（直播流） =====================
    public VideoModerationCancelResponse cancelVideoTask(String taskId) {
        return executeWithFailover(client -> {
            JSONObject params = new JSONObject();
            params.put("taskId", taskId);

            VideoModerationCancelRequest request = new VideoModerationCancelRequest()
                    .setService("liveStreamDetection")
                    .setServiceParameters(params.toJSONString());

            return client.videoModerationCancel(request);
        });
    }

    /**
     * 输出调试日志
     */
    public static void print(Object result) {
        System.out.println(JSON.toJSONString(result, true));
    }

    /**
     * 函数式接口：用于统一封装 SDK 调用逻辑
     */
    @FunctionalInterface
    private interface AliyunRequestExecutor<T> {
        T execute(Client client) throws Exception;
    }

}