import { SurveyResponses, SurveyResponseValue } from '../types'
import { isArray, isNullish, isUndefined } from '../utils'

export const SURVEY_LANGUAGE_PROPERTY = '$survey_language'

export function getSurveyResponseKey(questionId: string): string {
  return `$survey_response_${questionId}`
}

export function getSurveyOldResponseKey(originalQuestionIndex: number): string {
  return originalQuestionIndex === 0 ? '$survey_response' : `$survey_response_${originalQuestionIndex}`
}

export function getSurveyResponseValue(
  responses: SurveyResponses,
  questionId?: string
): SurveyResponseValue | undefined {
  if (!questionId) {
    return null
  }
  const response = responses[getSurveyResponseKey(questionId)]
  if (isArray(response)) {
    return [...response]
  }
  return response
}

export function buildSurveyResponseProperties(
  responses: SurveyResponses = {},
  survey: SurveyForResponses
): Record<string, unknown> {
  const oldFormatResponses: SurveyResponses = {}
  survey.questions.forEach((question: SurveyQuestionForResponses) => {
    if (isUndefined(question.originalQuestionIndex)) {
      return
    }
    const oldResponseKey = getSurveyOldResponseKey(question.originalQuestionIndex)
    const response = getSurveyResponseValue(responses, question.id)
    if (!isUndefined(response)) {
      oldFormatResponses[oldResponseKey] = response
    }
  })

  return {
    $survey_questions: survey.questions.map((question: SurveyQuestionForResponses) => ({
      id: question.id,
      question: question.question,
      response: getSurveyResponseValue(responses, question.id),
    })),
    ...responses,
    ...oldFormatResponses,
  }
}

export function surveyHasResponses(responses: SurveyResponses = {}): boolean {
  return Object.values(responses).some((response) => !isNullish(response))
}

export function getSurveyInteractionProperty(survey: SurveyWithIteration, action: string): string {
  let surveyProperty = `$survey_${action}/${survey.id}`
  if (survey.current_iteration && survey.current_iteration > 0) {
    surveyProperty = `$survey_${action}/${survey.id}/${survey.current_iteration}`
  }

  return surveyProperty
}
type SurveyQuestionForResponses = {
  id?: string
  question: string
  originalQuestionIndex?: number
}

type SurveyForResponses = {
  questions: SurveyQuestionForResponses[]
}

type SurveyWithIteration = {
  id: string
  current_iteration?: number | null
}