// ==UserScript==
// @name		天数正计时
// @namespace	https://bbs.tampermonkey.net.cn/
// @version		0.1
// @description	记录开始日期的累计天数，每隔一天计数增加1，可以在设置中填写回滚值对天数进行减少
// @author		Exisi
// @crontab    * 18-23 once * *
// @grant		GM_notification
// @grant		GM_getValue
// @grant		GM_setValue
// @supportURL  www.exi.ink
// ==/UserScript==

/* ==UserConfig==
设置:
    Notice:
        title: 标题
        description: 请输入通知标题
    Timeout:
        title: 通知时间
        description: 请输入每次通知保持的时长，默认 3 秒
    Count:
        title: 累计天数
        description: 请输入计数，默认为0，每天增加1
    Back:
        title: 回滚值
        description: 请输入回滚值，默认为0
 ==/UserConfig== */

function getDiffDay(pre, cur) {
    let pre_date = new Date();
    let cur_date = new Date();
    pre_date.setFullYear(pre.year, pre.month - 1, pre.day);
    cur_date.setFullYear(cur.year, cur.month - 1, cur.day);
    let diff = (cur_date - pre_date) / 1000 / 3600 / 24;
    return diff;
}

return new Promise((resolve, reject) => {
    let notice = GM_getValue('设置.Notice', '') != '' ? GM_getValue('设置.Notice') : 0;
    let start = GM_getValue('设置.Count', '') != '' ? GM_getValue('设置.Count') : 0;
    let back = GM_getValue('设置.Back', '') != '' ? GM_getValue('设置.Back') : 0;
    let date = new Date();
    let current = {
        year: date.getFullYear(),
        month: date.getMonth() + 1,
        day: date.getDate(),
    }
    let mark = GM_getValue('mark', '') != '' ? 1 : 0;
    if (mark) {
        let previous = GM_getValue('mark');
        let diff_day = parseInt(getDiffDay(previous, current))
        start -= back;
        start += diff_day;
        GM_setValue('设置.Count', start);
        GM_setValue('设置.Back', '');
        GM_setValue('mark', current);
    } else {
        GM_setValue('mark', current);
    }
    GM_notification({
        title: notice,
        text: '记录：'+start,
        timeout: GM_getValue('设置.Timeout') != '' ? GM_getValue('设置.Timeout') : 3000,
    });
    resolve('ok');
});