<?php


namespace app\common\command;


use app\common\model\FlowLogs;
use app\common\model\User;
use app\common\model\UserTraffic;
use think\console\Command;
use think\console\Input;
use think\console\Output;
use think\Db;
use think\Exception;

class SettlementTraffic extends Command
{
    protected function configure()
    {
//        parent::configure(); // TODO: Change the autogenerated stub
        $this->setName('settlement')->setDescription('后台统计用户流量使用, 并扣除相关流量');
    }

    /**
     * 功能: 执行任务, 计算统计使用的流量
     * @param Input $input
     * @param Output $output
     * @return int|void|null
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\ModelNotFoundException
     * @throws \think\exception\DbException
     */
    protected function execute(Input $input, Output $output)
    {
//        parent::execute($input, $output); // TODO: Change the autogenerated stub
//        $output->writeln("TestCommand");

        $dateTime = time() - 5; // 设置处理数据的时间为当前时间的前5秒，避免数据竞争

        // 分组统计出指定时间内用户使用了的流量
        $data = FlowLogs::where('created_at', '<=', $dateTime)
            ->field('username, sum(bytes) as bytes')
            ->group('username')
            ->select()->toArray();

        // 当前数据所有用户名的数组
        $userNames = array_column($data, 'username');
        $users = collection(User::whereIn('username', $userNames)->field('id, username')->select())->toArray();
        $userNameMapId = array_column($users, 'id', 'username');
        Db::startTrans();
        try {
            foreach ($data as $datum) {
                if (!$this->usedTraffic($userNameMapId[$datum['username']], $datum['bytes'], $dateTime)) {
                    throw new Exception('统计用户使用流量失败');
                }
            }
            // 指定时间段的流量已统计，删除相关记录
            FlowLogs::where('created_at', '<=', $dateTime)->delete();
            // 统计数据成功，提交事物
            Db::commit();
        } catch (Exception $e) {            // 操作失败，数据库信息回滚
            Db::rollback();
        }
    }


    /**
     * 功能: 处理用户使用过的流量
     * @param $uid
     * @param $bytes
     * @param $dateTime
     * @return bool
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\ModelNotFoundException
     * @throws \think\exception\DbException
     */
    protected function usedTraffic($uid, $bytes, $dateTime)
    {
        $usable = UserTraffic::where('uid', $uid)
            ->where('is_usable', '1')
            ->where('start_time', '<', $dateTime)
            ->where('expired_time', '>', $dateTime)
            ->order('expired_time', 'ASC')
            ->select();

        if (empty($usable)) {
            return true;
        }

        foreach ($usable as $item) {
            if ($bytes == 0) break;
            if ($item->traffic > bcadd($item->used, $bytes)) {
                $item->setInc('used', $bytes);
            } else {
                $bytes = bcsub($bytes, bcsub($item->traffic, $item->used));
                $item->used = $item->traffic;
                $item->is_usable = 0;
                $item->save();
            }
        }
        return true;
    }
}