<?php
namespace app\common\service;

use think\facade\Log;

class WorkTimeService
{
    /**
     * 判断当前时间是否为工作时间
     * @param string $workDay     工作日字符串，如 "1,2,3,4,5,6,7"
     * @param string $workStart   上班时间，如 "8:00"
     * @param string $workEnd     下班时间，如 "22:00"
     * @param string|null $checkTime 要检查的时间（可选），默认当前时间
     * @return bool
     */
    public static function isWorkingTime(string $workDay, string $workStart, string $workEnd, string $checkTime = null): bool
    {
        try {
            // 解析工作日配置
            $workDays = self::parseWorkDays($workDay);

            // 获取当前时间或指定时间
            $now = $checkTime ? strtotime($checkTime) : time();
            $currentWeekDay = date('N', $now); // 1-7，对应周一到周日

            // 判断是否为工作日
            if (!in_array($currentWeekDay, $workDays)) {
                return false;
            }

            // 获取当天的上班和下班时间戳
            $today = date('Y-m-d', $now);
            $startTime = strtotime($today . ' ' . $workStart);
            $endTime = strtotime($today . ' ' . $workEnd);

            // 处理跨天的情况（如22:00到次日8:00）
            if ($endTime < $startTime) {
                // 如果当前时间在上班时间之后，则endTime为次日
                if ($now >= $startTime) {
                    $endTime = strtotime($today . ' ' . $workEnd . ' +1 day');
                } else {
                    // 如果当前时间在上班时间之前，则startTime为昨日
                    $startTime = strtotime($today . ' ' . $workStart . ' -1 day');
                }
            }

            // 判断当前时间是否在工作时间内
            return $now >= $startTime && $now <= $endTime;

        } catch (\Exception $e) {
            Log::error('判断工作时间出错: ' . $e->getMessage());
            return false;
        }
    }

    /**
     * 解析工作日字符串为数组
     * @param string $workDay
     * @return array
     */
    private static function parseWorkDays(string $workDay): array
    {
        if (empty($workDay)) {
            return [];
        }

        $days = explode(',', $workDay);
        $result = [];

        foreach ($days as $day) {
            $day = trim($day);
            if (is_numeric($day) && $day >= 1 && $day <= 7) {
                $result[] = (int)$day;
            }
        }

        return array_unique($result);
    }

    /**
     * 获取剩余工作时间（秒）
     * @param string $workDay
     * @param string $workStart
     * @param string $workEnd
     * @return int
     */
    public static function getRemainingWorkTime(string $workDay, string $workStart, string $workEnd): int
    {
        if (!self::isWorkingTime($workDay, $workStart, $workEnd)) {
            return 0;
        }

        $now = time();
        $today = date('Y-m-d');
        $endTime = strtotime($today . ' ' . $workEnd);

        // 处理跨天情况
        if ($endTime < $now) {
            $endTime = strtotime($today . ' ' . $workEnd . ' +1 day');
        }

        return max(0, $endTime - $now);
    }

    /**
     * 获取下个工作时间开始的时间戳
     * @param string $workDay
     * @param string $workStart
     * @param string $workEnd
     * @return int
     */
    public static function getNextWorkTime(string $workDay, string $workStart, string $workEnd): int
    {
        $now = time();
        $workDays = self::parseWorkDays($workDay);
        $currentWeekDay = date('N', $now);

        // 查找下一个工作日
        $nextWorkDay = null;
        for ($i = 0; $i < 7; $i++) {
            $checkDay = ($currentWeekDay + $i) % 7;
            $checkDay = $checkDay == 0 ? 7 : $checkDay;

            if (in_array($checkDay, $workDays)) {
                $nextWorkDay = $checkDay;
                $daysToAdd = $i;
                break;
            }
        }

        if ($nextWorkDay === null) {
            return 0;
        }

        // 计算下一个工作日的开始时间
        $nextDate = date('Y-m-d', strtotime("+{$daysToAdd} days"));
        $nextStartTime = strtotime($nextDate . ' ' . $workStart);

        return $nextStartTime;
    }
}