<?php

namespace app\inquiry\service;

use support\Db;
use support\Redis;
use support\exception\BusinessException;
use Webman\RedisQueue\Redis as RedisQueueRedis;

class InquiryAssignService
{
    /**
     * 按渠道分配 inquiry_log 中待分配的记录，轮询业务员，并推送到 CRM 队列
     *
     * @param int[]  $salesUserIds  参与轮询的业务员ID列表
     * @param string $roundRobinKey 轮询分组key（Redis记指针）
     * @param int    $channelId     渠道ID（对应 inquiry_log.channel）
     * @param int    $limit         每次最多分配多少条
     *
     * @return int 实际分配的条数
     */
    public function assignBatch(array $salesUserIds, string $roundRobinKey, int $channelId, int $limit = 100): int
    {
        $userIds = array_values(array_filter(array_map('intval', $salesUserIds), fn($v) => $v > 0));
        if (empty($userIds)) {
            throw new BusinessException('分配失败：业务员列表为空');
        }

        $inquiries = Db::table('inquiry_log')
            ->where('status', 0)
            ->where('recipient', 0)
            ->where('channel', $channelId)
            ->orderBy('id')
            ->limit($limit)
            ->get();

        if ($inquiries->isEmpty()) {
            return 0;
        }

        $now   = time();
        $count = 0;

        foreach ($inquiries as $row) {
            $inquiryId       = (int)$row->id;
            $recipientUserId = $this->nextRecipientId($userIds, $roundRobinKey);

            Db::transaction(function () use ($inquiryId, $recipientUserId, $now, &$count) {
                $affected = Db::table('inquiry_log')
                    ->where('id', $inquiryId)
                    ->update([
                        'recipient'  => $recipientUserId,
                        'status'     => 2,
                        'r_time'     => $now,
                        't_time'     => $now,
                        'updated_at' => $now,
                    ]);

                if ($affected === 0) {
                    // 可能被其他进程抢先处理了，直接跳过
                    return;
                }

                $res = [
                    'id'            => $inquiryId,
                    'recipient'     => $recipientUserId,
                    'dispatched_at' => $now,
                    'source'        => 'fb_leads_inquiry',
                ];

                // 队列推送 —— 用你原来的写法
                RedisQueueRedis::send('inquiry-to-crm-new', $res);

                $count++;
            });
        }

        return $count;
    }

    /**
     * 轮询获取下一个业务员ID
     */
    protected function nextRecipientId(array $userIds, string $groupKey): int
    {
        $userIds = array_values(array_filter(array_map('intval', $userIds), fn($v) => $v > 0));
        if (empty($userIds)) {
            throw new BusinessException('轮询分配失败：业务员列表为空');
        }

        $count = count($userIds);
        $key   = 'inquiry:assign:round_robin:' . $groupKey;

        $val   = Redis::incr($key); // 原子自增
        $index = ($val - 1) % $count;

        return $userIds[$index];
    }
}