let curDate = new Date();

function printDate(date) {
  return date.getFullYear() + "年" + (date.getMonth() + 1) + "月" + date.getDate() + "日";
}

function render() {
  $("#date").text(printDate(curDate));
  const daysAfter = (curDate - groupStartDate) / 86400000;
  $("#group").text("值日生房间号：" + ((daysAfter % 5) * 2 + 1) + "、" + ((daysAfter % 5) * 2 + 2));
  let projects = "项目：";
  let first = true;
  project.forEach((x, _) => {
    const daysAfter = (curDate - x.startDate) / 86400000;
    if (daysAfter % x.interval === 0) {
      if (!first) {
        projects += "、";
      }
      first = false;
      projects += x.name;
    }
  });
  if (projects.length === 3) {
    projects += "无";
  }
  $("#content").text(projects);
}

$(document).ready(() => {
  $("#prev").click(() => {
    curDate = new Date(curDate.getTime() - 86400000);
    render();
  });

  $("#next").click(() => {
    curDate = new Date(curDate.getTime() + 86400000);
    render();
  });

  $("#datepicker").datepicker({
    showOtherMonths: true,
    selectOtherMonths: true
  });
  $("#datepicker").change(function() {
    curDate = new Date($(this).val());
    render();
  });

  curDate = new Date();
  curDate.setHours(0, 0, 0, 0);
  render();
});