import get from 'lodash/get';

// =========================================================================
// BASIC PERMISSIONS
// =========================================================================

const basicPerms = {
  INTERACT_WITH_COMMUNITY: (user) => {
    const banned = get(user, 'status.banned.status');
    const suspensionUntil = get(user, 'status.suspension.until');
    const suspended = suspensionUntil && new Date(suspensionUntil) > new Date();

    return !banned && !suspended;
  },
  EDIT_NAME: (user) => {
    const usernameStatus = user.status.username.status;
    return usernameStatus === 'UNSET' || usernameStatus === 'REJECTED';
  },
};

// =========================================================================
// PERMISSIONS BY ROLE
// =========================================================================

const basicRoles = {
  HAS_STAFF_TAG: ['ADMIN', 'MODERATOR', 'STAFF'],
};

const queryRoles = {
  UPDATE_CONFIG: ['ADMIN'],
  ACCESS_ADMIN: ['ADMIN', 'MODERATOR'],
  VIEW_USER_EMAILS: ['ADMIN'],
};

const mutationRoles = {
  CHANGE_ROLES: ['ADMIN'],
  MODERATE_COMMENTS: ['ADMIN', 'MODERATOR'],
};

const roles = {...basicRoles, ...queryRoles, ...mutationRoles};

export const can = (user, ...perms) => {
  if (!user) {
    return false;
  }

  return perms.every((perm) => {

    // Basic Permissions
    const permAction = basicPerms[perm];
    if (typeof permAction !== 'undefined') {
      return permAction(user);
    }

    // Permissions by Role
    const role = roles[perm];
    if (typeof role === 'undefined') {
      throw new Error(`${perm} is not a valid role or permission`);
    }

    return role.includes(user.role);
  });
};