const MODULE_MANAGE_PERMISSIONS = {
  announcements: "announcement_manage",
  schedule: "schedule_manage",
  resources: "resource_manage",
  fund: "fund_manage",
  timeline: "timeline_manage",
  votes: "vote_manage",
  reading_corner: "reading_corner_manage"
};

const TEACHER_DEFAULT_PERMISSIONS = new Set([
  "member_view",
  "member_manage",
  "committee_manage",
  "announcement_manage",
  "timeline_manage",
  "vote_manage",
  "schedule_manage",
  "resource_manage",
  "reading_corner_manage",
  "assignment_manage",
  "module_manage"
]);

function activeMembership(user, classId) {
  if (!user) return null;
  const memberships = Array.isArray(user.memberships) ? user.memberships : [];
  return memberships.find((item) => item.class_id === classId) || user.active_membership || null;
}

function hasManagePermission(user, classId, moduleKey) {
  const permission = MODULE_MANAGE_PERMISSIONS[moduleKey];
  if (!permission || !user) return false;
  if (user.role === "super_admin") return true;
  const membership = activeMembership(user, classId);
  const membershipPermissions = membership && Array.isArray(membership.class_permissions)
    ? membership.class_permissions
    : [];
  if (user.role === "teacher") {
    return TEACHER_DEFAULT_PERMISSIONS.has(permission) || membershipPermissions.includes(permission);
  }
  return membershipPermissions.includes(permission);
}

module.exports = {
  hasManagePermission
};