const { get } = require("../../utils/api");
const { showError } = require("../../utils/page-helpers");

function formatDateTime(value) {
  if (!value) return "";
  return String(value).replace("T", " ").slice(0, 16);
}

function scheduleTypeText(type) {
  return {
    course: "课程",
    deadline: "截止日",
    activity: "活动"
  }[type] || type || "排期";
}

function countdownText(value) {
  if (!value) return "";
  const targetDate = new Date(value);
  if (Number.isNaN(targetDate.getTime())) return "";
  const today = new Date();
  const targetDay = new Date(targetDate.getFullYear(), targetDate.getMonth(), targetDate.getDate()).getTime();
  const todayDay = new Date(today.getFullYear(), today.getMonth(), today.getDate()).getTime();
  const diffDays = Math.round((targetDay - todayDay) / (24 * 60 * 60 * 1000));
  if (diffDays < 0) return `已逾期 ${Math.abs(diffDays)} 天`;
  if (diffDays === 0) return "今天截止";
  if (diffDays === 1) return "明天截止";
  return `还有 ${diffDays} 天`;
}

function countdownClass(text) {
  if (!text) return "";
  if (text.indexOf("已逾期") === 0) return "overdue";
  if (text === "今天截止" || text === "明天截止") return "urgent";
  return "";
}

Page({
  data: { item: null, loading: false },

  onLoad(options) {
    wx.setNavigationBarTitle({ title: "排期详情" });
    this.load(options.id);
  },

  async load(id) {
    if (!id) return;
    this.setData({ loading: true });
    try {
      const item = await get(`/api/schedule/${id}`);
      const countdown_text = item.type === "deadline" ? countdownText(item.start_time) : "";
      this.setData({
        item: {
          ...item,
          start_time_text: formatDateTime(item.start_time),
          end_time_text: formatDateTime(item.end_time),
          type_text: scheduleTypeText(item.type),
          start_label: item.type === "deadline" ? "截止时间" : "开始时间",
          countdown_text,
          countdown_class: countdownClass(countdown_text),
          location_text: item.location || "地点待定",
          description_text: item.description || "暂无说明"
        }
      });
    } catch (error) {
      showError(error, "加载排期失败");
    } finally {
      this.setData({ loading: false });
    }
  }
});