const { del, get } = require("../../utils/api");
const { getModule } = require("../../utils/modules");
const { hasManagePermission } = require("../../utils/permissions");
const { ensureModuleOpen, getActiveClassId, showError } = require("../../utils/page-helpers");

const ENDPOINTS = {
  announcements: "/api/announcements/",
  directory: "/api/directory/",
  timeline: "/api/timeline/",
  votes: "/api/votes/",
  schedule: "/api/schedule/",
  fund: "/api/fund/"
};

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

function formatScheduleTime(item) {
  const start = formatDateTime(item.start_time);
  const end = formatDateTime(item.end_time);
  if (item.type === "deadline") return `截止 ${start}`;
  if (!end) return start;
  if (start.slice(0, 10) === end.slice(0, 10)) {
    return `${start} - ${end.slice(11)}`;
  }
  return `${start} - ${end}`;
}

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

Page({
  data: {
    moduleKey: "",
    title: "功能",
    moduleIcon: "项",
    items: [],
    canManage: false,
    canPostTimeline: false,
    isTimeline: false,
    isDirectory: false,
    isSchedule: false,
    isFund: false,
    isVotes: false,
    fundStats: null,
    directoryStats: null,
    needsRefresh: false,
    loading: false
  },

  onLoad(options) {
    const moduleKey = options.module || "";
    const module = getModule(moduleKey);
    const app = getApp();
    const classId = getActiveClassId();
    const title = module ? module.title : "功能";
    const icon = module ? module.icon : "项";
    this.setData({
      moduleKey,
      title,
      moduleIcon: icon,
      isTimeline: moduleKey === "timeline",
      isDirectory: moduleKey === "directory",
      isSchedule: moduleKey === "schedule",
      isFund: moduleKey === "fund",
      isVotes: moduleKey === "votes",
      canPostTimeline: moduleKey === "timeline",
      canManage: ["announcements", "votes", "schedule", "fund"].includes(moduleKey) &&
        hasManagePermission(app.globalData.user, classId, moduleKey)
    });
    wx.setNavigationBarTitle({ title });
    if (!module || !ensureModuleOpen(moduleKey)) return;
    this.load();
  },

  onShow() {
    if (this.data.moduleKey && getModule(this.data.moduleKey)) {
      this.setData({ needsRefresh: false });
      this.load();
    }
  },

  async onPullDownRefresh() {
    await this.load();
    wx.stopPullDownRefresh();
  },

  async load() {
    const classId = getActiveClassId();
    const endpoint = ENDPOINTS[this.data.moduleKey];
    if (!endpoint) return;
    this.setData({ loading: true });
    try {
      let stats = null;
      if (this.data.moduleKey === "fund") {
        stats = await get("/api/fund/statistics", { class_id: classId });
      }
      let directoryStats = null;
      if (this.data.moduleKey === "directory") {
        directoryStats = await get("/api/directory/stats", { class_id: classId });
      }
      const res = await get(endpoint, { page_size: 20, class_id: classId });
      const rawItems = Array.isArray(res) ? res : res.items || [];
      const currentUser = getApp().globalData.user || {};
      const currentUserId = currentUser.id;
      const formatAmount = (value) => Number(value || 0).toFixed(2);
      const items = rawItems.map((item) => ({
        ...item,
        can_delete: this.data.moduleKey === "timeline" && item.author_id === currentUserId,
        initial: String(item.name || item.author_name || this.data.title || "项").slice(0, 1),
        member_role_text: item.membership_role === "teacher" ? "老师" : "同学",
        member_role_class: item.membership_role === "teacher" ? "teacher" : "student",
        show_student_id: item.membership_role !== "teacher" && item.student_id,
        schedule_day: item.start_time ? String(item.start_time).slice(8, 10) : "",
        schedule_month: item.start_time ? `${String(item.start_time).slice(5, 7)}月` : "",
        schedule_time_text: this.data.moduleKey === "schedule" ? formatScheduleTime(item) : "",
        schedule_type_text: this.data.moduleKey === "schedule" ? scheduleTypeText(item.type) : "",
        vote_status_text: item.status === "open" ? "进行中" : "已关闭",
        vote_type_text: item.vote_type === "multiple" ? `多选，最多 ${item.max_choices || 1} 项` : "单选",
        vote_action_text: item.has_voted ? "已参与" : "待参与",
        vote_pill_class: item.has_voted ? "done" : "",
        vote_options_text: Array.isArray(item.options) ? `${item.options.length} 个选项` : "",
        committee_text: item.committee_role ? ` · ${item.committee_role}` : "",
        fund_type_text: item.type === "income" ? "收入" : "支出",
        fund_type_class: item.type === "income" ? "income" : "expense",
        amount_text: formatAmount(item.amount),
        image_urls: Array.isArray(item.image_urls) ? item.image_urls : []
      }));
      const fundStats = stats ? {
        ...stats,
        total_income_text: formatAmount(stats.total_income),
        total_expense_text: formatAmount(stats.total_expense),
        balance_text: formatAmount(stats.balance)
      } : null;
      this.setData({ items, fundStats, directoryStats });
    } catch (error) {
      if (error.message === "该功能当前未开放") {
        wx.redirectTo({
          url: `/pages/module-unavailable/index?title=${encodeURIComponent(this.data.title)}`
        });
        return;
      }
      showError(error);
    } finally {
      this.setData({ loading: false });
    }
  },

  openItem(event) {
    const id = event.currentTarget.dataset.id;
    const key = this.data.moduleKey;
    if (!id) return;
    if (key === "directory") {
      wx.navigateTo({ url: `/pages/member-detail/index?id=${id}` });
      return;
    }
    if (key === "schedule") {
      wx.navigateTo({ url: `/pages/schedule-detail/index?id=${id}` });
      return;
    }
    if (key === "timeline") {
      wx.navigateTo({ url: `/pages/timeline-detail/index?id=${id}` });
      return;
    }
    if (key === "votes") {
      wx.navigateTo({ url: `/pages/vote-detail/index?id=${id}` });
      return;
    }
    if (key === "fund") {
      wx.navigateTo({ url: `/pages/fund-detail/index?id=${id}` });
    }
  },

  previewImage(event) {
    const current = event.currentTarget.dataset.src;
    const postId = Number(event.currentTarget.dataset.postId);
    const post = this.data.items.find((item) => item.id === postId);
    const urls = post && post.image_urls ? post.image_urls : [];
    if (!current || !urls.length) return;
    wx.previewImage({ current, urls });
  },

  previewFundImage(event) {
    const current = event.currentTarget.dataset.src;
    const recordId = Number(event.currentTarget.dataset.recordId);
    const record = this.data.items.find((item) => item.id === recordId);
    const urls = record && record.image_urls ? record.image_urls : [];
    if (!current || !urls.length) return;
    wx.previewImage({ current, urls });
  },

  openTimelineActions(event) {
    const id = event.currentTarget.dataset.id;
    wx.showActionSheet({
      itemList: ["删除动态"],
      itemColor: "#b42318",
      success: () => {
        wx.showModal({
          title: "删除动态",
          content: "删除后无法恢复，确认删除这条动态？",
          confirmText: "删除",
          confirmColor: "#b42318",
          success: async (res) => {
            if (!res.confirm) return;
            try {
              await del(`/api/timeline/${id}`);
              wx.showToast({ title: "已删除", icon: "success" });
              this.load();
            } catch (error) {
              showError(error, "删除失败");
            }
          }
        });
      }
    });
  },

  openManage() {
    wx.navigateTo({ url: `/pages/manage/index?module=${this.data.moduleKey}` });
  },

  openTimelineCreate() {
    wx.navigateTo({ url: "/pages/timeline-create/index" });
  },

  openCreate() {
    if (this.data.canPostTimeline) {
      this.openTimelineCreate();
      return;
    }
    if (this.data.canManage) {
      this.openManage();
    }
  }
});