import { IPasswordHasher } from './IPasswordHasher'

export class CombinedPasswordHasher implements IPasswordHasher {
  private hashers: { [name: string]: IPasswordHasher }

  constructor(
    private defaultHasherName: string,
    defaultHasher: IPasswordHasher,
    additionalHashers?: { [name: string]: IPasswordHasher }
  ) {
    this.hashers = {
      [this.defaultHasherName]: defaultHasher,
      ...(additionalHashers || {}),
    }
  }

  public async hash(password: string): Promise<string> {
    return this.defaultHasherName + ':' + (await this.hashers[this.defaultHasherName].hash(password))
  }

  public verify(password: string, passwordHash: string): Promise<boolean> {
    const passwordHashName = passwordHash.split(':')[0]
    const passwordHashTail = passwordHash
      .split(':')
      .slice(1)
      .join(':')
    return this.hashers[passwordHashName].verify(password, passwordHashTail)
  }
}