const { getModule, isModuleEnabled } = require("./modules");

function getActiveClassId() {
  const app = getApp();
  const user = app.globalData.user || wx.getStorageSync("auth_user");
  const memberships = user && Array.isArray(user.memberships) ? user.memberships : [];
  const activeMembership = user && user.active_membership ? user.active_membership : null;
  const firstMembership = memberships.length ? memberships[0] : null;
  return app.globalData.activeClassId || (activeMembership && activeMembership.class_id) || (firstMembership && firstMembership.class_id) || null;
}

function getEnabledModules() {
  const app = getApp();
  const user = app.globalData.user || wx.getStorageSync("auth_user");
  return app.globalData.enabledModules || (user && user.enabled_modules) || null;
}

function getActiveClassName() {
  const app = getApp();
  const user = app.globalData.user || wx.getStorageSync("auth_user");
  const classId = getActiveClassId();
  const savedClass = wx.getStorageSync("active_class") || null;
  if (savedClass && savedClass.id === classId && savedClass.name) return savedClass.name;
  const memberships = user && Array.isArray(user.memberships) ? user.memberships : [];
  const membership = memberships.find((item) => item.class_id === classId);
  const activeMembership = user && user.active_membership ? user.active_membership : null;
  return (membership && membership.class_name) || (activeMembership && activeMembership.class_name) || "HKU ICB";
}

function ensureModuleOpen(moduleKey) {
  const enabledModules = getEnabledModules();
  if (isModuleEnabled(moduleKey, enabledModules)) return true;
  const module = getModule(moduleKey);
  const title = module ? module.title : "功能";
  wx.redirectTo({
    url: `/pages/module-unavailable/index?title=${encodeURIComponent(title)}`
  });
  return false;
}

function showError(error, fallback = "加载失败") {
  wx.showToast({
    title: (error && error.message) || fallback,
    icon: "none"
  });
}

module.exports = {
  ensureModuleOpen,
  getActiveClassId,
  getActiveClassName,
  getEnabledModules,
  showError
};