searchUsers.js

class SearchUsers {
  constructor(sb) {
    this.sb = sb;
    this.lookupDictionary = {};
    this.userDictionary = {};
  }

  addQueryUsersToDictionary(users, searchTerm) {
    if (users.length === 0) {
      this.lookupDictionary[searchTerm] = {};
      return;
    }

    users.forEach((user) => {
      this.userDictionary[user.userId] = user;
      for (var i = 1; i <= 10; i++) {
        let dictionaryKey = user.nickname.slice(0, i).toLowerCase();
        const userId = user.userId;
        let entry = {};
        entry[userId] = true;
        if (this.lookupDictionary[dictionaryKey]) {
          entry = this.lookupDictionary[dictionaryKey];
          entry[userId] = true;
        }
        this.lookupDictionary[dictionaryKey] = entry;
      }
    });
  }

  querySendbirdForNicknames(searchTerm) {
    return new Promise((resolve, reject) => {
      let query = this.sb.createApplicationUserListQuery();
      try {
        query.nicknameStartsWithFilter = searchTerm;
        query.limit = 100;
      } catch (e) {
        console.log(e);
        return;
      }

      const fetch = () => {
        if (query.hasNext) {
          query.next((users, error) => {
            console.log(users);
            if (error) reject(error);
            this.addQueryUsersToDictionary(users, searchTerm);
            fetch();
          });
        } else {
          resolve(this.lookupDictionary);
        }
      };
      fetch();
    });
  }

  searchApplicationUsers(searchTerm) {
    return new Promise((resolve, reject) => {
      const result = {
        usersDictionary: {},
        lookupDictionary: {}
      };
      if (searchTerm.length <= 3) {
        reject(null);
        return;
      }
      if (this.lookupDictionary[searchTerm]) {
        console.log("CALLED_IN");
        result.usersDictionary = this.userDictionary;
        result.lookupDictionary = this.lookupDictionary[searchTerm];
        resolve(result);
        return;
      }
      console.log("CALLED OUT");
      this.querySendbirdForNicknames(searchTerm)
        .then((lookupDictionary) => {
          result.usersDictionary = this.userDictionary;
          result.lookupDictionary = this.lookupDictionary[searchTerm];
          resolve(result);
        })
        .catch((error) => {
          reject(error);
        });
    });
  }
}

export default SearchUsers;