import { Schema, Model, Document } from 'mongoose';
import mongoosePaginate from 'mongoose-paginate-v2';

import { IExternalUserGroup } from '~/features/external-user-group/interfaces/external-user-group';
import UserGroup from '~/server/models/user-group';
import { getOrCreateModel } from '~/server/util/mongoose-utils';

export interface ExternalUserGroupDocument extends IExternalUserGroup, Document {}

export interface ExternalUserGroupModel extends Model<ExternalUserGroupDocument> {
  [x:string]: any, // for old methods

  PAGE_ITEMS: 10,

  findGroupsWithDescendantsRecursively: (groups, descendants?) => any,
}

const schema = new Schema<ExternalUserGroupDocument, ExternalUserGroupModel>({
  name: { type: String, required: true },
  parent: { type: Schema.Types.ObjectId, ref: 'ExternalUserGroup', index: true },
  description: { type: String, default: '' },
  externalId: { type: String, required: true, unique: true },
  provider: { type: String, required: true },
}, {
  timestamps: true,
});
schema.plugin(mongoosePaginate);
// group name should be unique for each provider
schema.index({ name: 1, provider: 1 }, { unique: true });

/**
 * Find group that has specified externalId and update, or create one if it doesn't exist.
 * @param name ExternalUserGroup name
 * @param name ExternalUserGroup externalId
 * @param name ExternalUserGroup provider
 * @param name ExternalUserGroup description
 * @param name ExternalUserGroup parentId
 * @returns ExternalUserGroupDocument[]
 */
schema.statics.findAndUpdateOrCreateGroup = async function(name: string, externalId: string, provider: string, description?: string, parentId?: string) {
  let parent: ExternalUserGroupDocument | null = null;
  if (parentId != null) {
    parent = await this.findOne({ _id: parentId });
    if (parent == null) {
      throw Error('Parent does not exist.');
    }
  }

  return this.findOneAndUpdate({ externalId }, {
    name, description, provider, parent,
  }, { upsert: true, new: true });
};

schema.statics.findWithPagination = UserGroup.findWithPagination;

schema.statics.findChildrenByParentIds = UserGroup.findChildrenByParentIds;

schema.statics.findGroupsWithAncestorsRecursively = UserGroup.findGroupsWithAncestorsRecursively;

schema.statics.findGroupsWithDescendantsRecursively = UserGroup.findGroupsWithDescendantsRecursively;

schema.statics.findGroupsWithDescendantsById = UserGroup.findGroupsWithDescendantsById;

export default getOrCreateModel<ExternalUserGroupDocument, ExternalUserGroupModel>('ExternalUserGroup', schema);