<?php
namespace App\Repositories\Service;

use Hyperf\Redis\Redis;

class UserSingInService
{
    /**
     * @var Redis
     */
    protected $redis;

    public function __construct()
    {
        $this->redis = make(Redis::class);
    }

    /**
     * 签到
     *
     * @param string $userId
     * @return int
     */
    public function doSigns(string $userId): bool
    {
        $day = date('d') - 1;
        $date = date('Y-m');
        return $this->redis->setbit($this->buildSignKey($userId, $date), (int)$day, true);
    }

    /**
     * 统计连续签到次数
     * 统计的是连续的签到次数，按业务需求改为七天的
     *
     * @param string $userId
     * @return int
     */
    public function getContinuousSignCount(string $userId): int
    {
        $day = date('d');
        $lastMonthCount = 0;
        if ($day == '1' || $day == '01') {
            $lastMonthCount = $this->lastMonthContinuousSignCount($userId);
        }

        $date = date('Y-m');
        $key = $this->buildSignKey($userId, $date);
        //获取本月的二进制数据
        $nowContinuousStr = $this->redis->rawCommand('BITFIELD', $key, 'GET', 'u' . (int)$day, 0);

        //获取连续签到天数
        if ($nowContinuousStr) {
            $count = $this->countContinuousSignCount($nowContinuousStr, (int)$day);
        } else {
            $count = 0;
        }

        $count = $count + $lastMonthCount;
        if ($count > 7) {
            $count = 7;
        }

        return $count;
    }

    /**
     * 检查用户是否签到
     *
     * @param string $userId
     * @param string $date
     * @return int
     */
    public function checkSign(string $userId, string $date): int
    {
        $day = date('d') - 1;
        return $this->redis->getBit($this->buildSignKey($userId, $date), $day);
    }

    /**
     * 统计上个月连续签到总数
     *
     * @param string $userId
     * @return int
     */
    public function lastMonthContinuousSignCount(string $userId): int
    {
        $date = date('Ym', strtotime('-1 month'));
        //上个月最后一天
        $day = date("d", strtotime(-date('d') . 'day'));
        $key = $this->buildSignKey($userId, $date);

        //获取本月签到的所有二进制数据
        $continuousStr = $this->redis->get($key);
        if ($continuousStr) {
            $res = $this->countContinuousSignCount($continuousStr, (int)$day);
        } else {
            $res = 0;
        }

        return $res;
    }

    /**
     * 连续签到计算
     *
     * @param string $continuousStr
     * @param string $day
     * @return int
     */
    private function countContinuousSignCount(array $continuousStr, int $day): int
    {
        if (!empty($continuousStr)) {
            $v = $continuousStr[0];
            $count = 0;

            for ($i = 0; $i < $day; $i++) {
                if ($v >> 1 << 1 == $v) {
                    // 低位为0且非当天说明连续签到中断了
                    if ($i > 0) {
                        break;
                    }
                } else {
                    $count += 1;
                }
                $v >>= 1;
            }
        } else {
            $count = 0;
        }

        return $count;
    }

    /**
     * 构建签到key
     *
     * @param string $userId
     * @param string $date
     * @return string
     */
    private function buildSignKey(string $userId, string $date): string
    {
        return "u:sign:{$userId}:{$date}";
    }
}