import { Survey } from '../entities/index.js'
import { fetchQuestions } from '../services/index.js'
import { splash, possible, surveyStages, allSteps } from './lang.js'

class SurveyFactory {
    constructor() {
        this.questionsFromDb = []
    }
    _addSurveyStages(responseKeys, surveyStages) {
        responseKeys.forEach((key, i) => {
            key.survey_stage = surveyStages[i]
        })
        return responseKeys
    }
    _addResponses(responseKeys, responsesByCategory) {
        Object.keys(responsesByCategory).forEach(k => {
            responseKeys.forEach(key => {
                if (key.survey_stage === k) {
                    key.responses = responsesByCategory[k]
                }
            })
        })
        return responseKeys
    }
    _addComponents(responseKeys) {
        responseKeys.forEach(key => {
            switch (key.category) {
                case 'input':
                    key.component = 'FormInput'
                    break
                case 'choice':
                    key.component = 'FormDropdown'
                    break
                case 'aspect':
                    key.component = 'QuestionResponse'
                    break
            }
        })
        return responseKeys
    }
    _sortSurveySteps(mutatedResponseKeys, allSteps) {
        const reordered = [] 
        Object.values(allSteps).forEach((step, i) => {
            Object.values(mutatedResponseKeys).forEach(val => {
                if (val.survey_stage === step) {
                    reordered[i] = val
                }
            })
        })
        return reordered
    }
    _setSteps() {
        const responseKeys = this.questionsFromDb
        const responsesByCategory = possible['usa']
        let mutatedResponseKeys = this._addSurveyStages(responseKeys, surveyStages)
        mutatedResponseKeys = this._addResponses(responseKeys, responsesByCategory)
        mutatedResponseKeys = this._addComponents(responseKeys)
        mutatedResponseKeys = this._sortSurveySteps(mutatedResponseKeys, allSteps['usa'])
        // Splash page is placed at beginning of survey
        mutatedResponseKeys.unshift(splash)
        return mutatedResponseKeys
    }
    async getQuestions() {
        try {
            this.questionsFromDb = await fetchQuestions()
            return this.questionsFromDb
        } catch (err) {
            console.error(err)
        }
    }
    async createSurvey(roleTree) {
        if (!this.questionsFromDb.length) {
            const res = await this.getQuestions()
            console.warn(
                `Attempted to create a survey before getting questions: retrieved ${res.length} questions`,
            )
        }
        const steps = this._setSteps()
        return new Survey(steps, roleTree)
    }
}

export { SurveyFactory }