<?php

namespace app\common\library\live\message\provider;

use app\common\library\live\message\ProviderInterface;
use app\common\library\live\message\Result;
use app\common\model\config\System;
use aliyun\LiveMessage;

/**
 * 阿里云互动消息服务商适配器
 * 基于 \aliyun\LiveMessage 实现统一接口
 */
class Aliyun implements ProviderInterface
{
    /**
     * @var LiveMessage 阿里云 SDK 实例
     */
    protected $sdk;

    /**
     * 构造函数，从配置 aliyun_message 读取阿里云相关参数并实例化 SDK
     */
    public function __construct()
    {
        $config = System::getConfig('aliyun_message');

        $appId           = (is_array($config) && isset($config['app_id'])) ? $config['app_id'] : '';
        $appKey          = (is_array($config) && isset($config['app_key'])) ? $config['app_key'] : '';
        $appSign         = (is_array($config) && isset($config['app_sign'])) ? $config['app_sign'] : '';
        $accessKeyId     = (is_array($config) && isset($config['access_key_id'])) ? $config['access_key_id'] : '';
        $accessKeySecret = (is_array($config) && isset($config['access_key_secret'])) ? $config['access_key_secret'] : '';
        $dataCenter      = (is_array($config) && !empty($config['data_center'])) ? $config['data_center'] : 'cn-shanghai';

        $this->sdk = new LiveMessage($appId, $appKey, $appSign, $accessKeyId, $accessKeySecret, $dataCenter);
    }

    /**
     * 发送消息到群组
     * @param string $groupId    群组ID
     * @param string $body       消息体
     * @param int $msgType       消息类型（业务 type 映射后的阿里云 MsgType）
     * @param string $senderId   发送者ID
     * @param string $senderMeta 发送者扩展信息
     * @param string $msgTid     消息唯一标识
     * @return Result data 含 msg_tid
     */
    public function send($groupId, $body, $msgType = 10001, $senderId = '', $senderMeta = '', $msgTid = '')
    {
        // 若未传入 senderId，使用系统默认（管理员发送场景）
        if ($senderId === '') {
            $senderId = 'system';
        }

        $result = $this->sdk->sendGroupMessage($groupId, $body, $msgType, $senderId, $senderMeta, $msgTid);

        if ($result['success']) {
            return Result::success([
                'msg_tid' => isset($result['data']['msg_tid']) ? $result['data']['msg_tid'] : '',
            ], $result['raw']);
        }

        return Result::fail($result['error'], $result['raw']);
    }

    /**
     * 撤回/删除消息
     * @param string $groupId 群组ID
     * @param string $msgTid  阿里云消息唯一标识
     * @return Result
     */
    public function del($groupId, $msgTid)
    {
        $result = $this->sdk->deleteGroupMessage($groupId, $msgTid);

        if ($result['success']) {
            return Result::success($result['data'], $result['raw']);
        }

        return Result::fail($result['error'], $result['raw']);
    }

    /**
     * 获取群组在线用户
     * 对于超过 2000 人的超级大群，返回 success=false 且 error='SuperLargeGroup'，业务层可降级处理
     * @param string $groupId       群组ID
     * @param int $pageSize         每页数量（10-30，阿里云实际限制）
     * @param int $nextPageToken    下一页起始位置
     * @return Result data 含 total、list、next_page_token、has_more
     */
    public function getOnlineUser($groupId, $pageSize = 20, $nextPageToken = 0)
    {
        $result = $this->sdk->listGroupUsers($groupId, $pageSize, $nextPageToken);

        if ($result['success']) {
            $data    = $result['data'];
            $userIds = [];
            if (isset($data['user_list']) && is_array($data['user_list'])) {
                foreach ($data['user_list'] as $user) {
                    if (isset($user['user_id'])) {
                        $userIds[] = $user['user_id'];
                    }
                }
            }

            return Result::success([
                'total'           => count($userIds),
                'list'            => $userIds,
                'next_page_token' => isset($data['next_page_token']) ? $data['next_page_token'] : 0,
                'has_more'        => isset($data['has_more']) ? $data['has_more'] : false,
            ], $result['raw']);
        }

        // 超级大群特殊错误码，保持与接口约定一致
        if ($result['error_code'] === 'SuperLargeGroup') {
            return Result::fail('SuperLargeGroup', $result['raw']);
        }

        return Result::fail($result['error'], $result['raw']);
    }

    /**
     * 获取客户端登录鉴权信息
     * 实现 token = sha256(appId + appKey + userId + nonce + timestamp + role)
     * @param string $userId 用户ID（需过滤，仅保留 A-Z a-z 0-9 -，最长 64 字节）
     * @param string $role   角色（admin 或空字符串）
     * @return Result data 含 app_id、app_sign、auth、app_token
     */
    public function getLoginAuth($userId, $role = '')
    {
        $appId  = $this->sdk->getAppId();
        $appKey = $this->sdk->getAppKey();

        // userId 过滤：仅保留 [A-Za-z0-9-]，最长 64 字节
        $filteredUserId = $this->filterUserId($userId);
        if ($filteredUserId === '') {
            return Result::fail('userId 无效，过滤后为空', null);
        }

        // nonce 生成：AK- + md5(uniqid(mt_rand, true))
        $nonce = 'AK-' . md5(uniqid(mt_rand(), true));

        // timestamp：当前时间 + 86400 秒
        $timestamp = time() + 86400;

        // role 仅允许 admin 或空字符串
        $role = ($role === 'admin') ? 'admin' : '';

        // 计算 token
        $token = hash('sha256', $appId . $appKey . $filteredUserId . $nonce . $timestamp . $role);

        $data = [
            'app_id'    => $appId,
            'app_sign'  => $this->sdk->getAppSign(),
            'auth'      => [
                'nonce'     => $nonce,
                'timestamp' => $timestamp,
                'role'      => $role,
                'user_id'   => $filteredUserId,
            ],
            'app_token' => $token,
        ];

        return Result::success($data, null);
    }

    /**
     * 创建群组
     * @param string $groupId   群组ID
     * @param string $groupName 群组名称
     * @param string $groupMeta 群组扩展信息
     * @return Result
     */
    public function createGroup($groupId, $groupName = '', $groupMeta = '')
    {
        $result = $this->sdk->createGroup($groupId, $groupName, $groupMeta);

        if ($result['success']) {
            return Result::success($result['data'], $result['raw']);
        }

        return Result::fail($result['error'], $result['raw']);
    }

    /**
     * 删除群组
     * @param string $groupId 群组ID
     * @param string $operatorId 操作者ID（可选）
     * @return Result
     */
    public function deleteGroup($groupId, $operatorId = '')
    {
        $result = $this->sdk->deleteGroup($groupId, $operatorId);

        if ($result['success']) {
            return Result::success($result['data'], $result['raw']);
        }

        return Result::fail($result['error'], $result['raw']);
    }

    /**
     * 获取底层 SDK 实例（供扩展调用，如 listGroups）
     * @return LiveMessage
     */
    public function getSdk()
    {
        return $this->sdk;
    }

    /**
     * 过滤 userId，仅保留 [A-Za-z0-9-]，最长 64 字节
     * @param string $userId 原始用户ID
     * @return string
     */
    protected function filterUserId($userId)
    {
        $filtered = preg_replace('/[^A-Za-z0-9\-]/', '', (string)$userId);
        // 截断到 64 字节
        if (strlen($filtered) > 64) {
            $filtered = substr($filtered, 0, 64);
        }
        return $filtered;
    }
}