import {PatientAppUserInfo} from '@ciitizen/back-end-apps-patient-app-nestjs'
import {extractEmailDomain} from '@ciitizen/common-utils'
import {Experiment, GrowthBook, Result} from '@growthbook/growthbook'
import {Injectable} from '@nestjs/common'

type FeatureFlagKey = 'test-2'

const gb = new GrowthBook({
  apiHost: '<https://cdn.growthbook.io>',
  clientKey: '<redacted>',
  enableDevMode: true,
  subscribeToChanges: false,
  trackingCallback: (experiment: Experiment<any>, result: Result<any>): void => {
    // TODO: Make amplitude available on the backend to send events
  },
})

@Injectable()
export class ExperimentationService {
  private _growthbook: GrowthBook

  constructor() {
    this._growthbook = gb
  }

  async getCohort({user, featureFlagKey}: {user: PatientAppUserInfo; featureFlagKey: FeatureFlagKey}): Promise<string> {
    await this._growthbook.loadFeatures()

    await this._growthbook.setAttributes({
      emailDomain: extractEmailDomain(user.email),
      id: user?.authTokenInfo.auth0UserId,
    })

    const defaultValue = 'not enabled'
    let result = defaultValue
    // while (result === defaultValue) {
    result = this._growthbook.getFeatureValue(featureFlagKey, defaultValue)
    // }
    return result
  }
}