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

class SurveyFactory {
    constructor() {
        this.questionsFromDb = []
        this.responsesFromDb = []
    }
    _addResponses(responseKeys, responsesByCategory) {
        const existingResponses = {}
        // Removes empty form drop down options from possible['usa']
        Object.keys(responsesByCategory).forEach(categoryKey => {
            if (responsesByCategory[categoryKey].length) {
                existingResponses[categoryKey] =
                    responsesByCategory[categoryKey]
            }
        })
        // Adds form drop down options to each responseKey
        Object.keys(existingResponses).forEach(inputKey => {
            responseKeys.forEach(responseKey => {
                if (responseKey.survey_stage == inputKey) {
                    responseKey.responses = existingResponses[inputKey]
                }
            })
        })
        return responseKeys
    }
    _addComponents(responseKeys) {
        responseKeys.forEach(responseKey => {
            switch (responseKey.category) {
                case 'input':
                    responseKey.component = 'FormInput'
                    break
                case 'choice':
                    responseKey.component = 'FormDropdown'
                    break
                case 'aspect':
                    responseKey.component = 'QuestionResponse'
                    break
            }
        })
        return responseKeys
    }
    _addSurveySteps(responseKeys, surveyStages) {
        responseKeys.forEach(responseKey => {
            Object.keys(surveyStages).forEach((stage, i) => {
                if (responseKey.response_key_id == stage) {
                    responseKey.survey_stage = surveyStages[i + 1]
                }
            })
        })
        return responseKeys
    }
    // TODO: Don't nest the for loop...
    _sortSurveySteps(mutatedResponseKeys, allSteps) {
        const reordered = []
        Object.values(allSteps).forEach(step => {
            Object.values(mutatedResponseKeys).forEach(response => {
                if (surveyStages[response.response_key_id] === step) {
                    response.survey_stage = step
                    reordered.push(response)
                }
            })
        })
        return reordered
    }
    _setSteps() {
        const responseKeys = this.questionsFromDb
        const responsesByCategory = possible['usa']
        let mutatedResponseKeys = this._addSurveySteps(
            responseKeys,
            surveyStages,
        )
        mutatedResponseKeys = this._addResponses(
            mutatedResponseKeys,
            responsesByCategory,
        )
        mutatedResponseKeys = this._addComponents(responseKeys)
        mutatedResponseKeys = this._sortSurveySteps(
            mutatedResponseKeys,
            allSteps['usa'],
        )
        // Splash page is placed at beginning of survey
        mutatedResponseKeys.unshift(splash)
        // Auth page is placed after email/password
        mutatedResponseKeys.splice(8, 0, auth)
        return mutatedResponseKeys
    }
    async getQuestions() {
        try {
            this.questionsFromDb = await fetchQuestions()
            return this.questionsFromDb
        } catch (err) {
            console.error(err)
        }
    }
    async addNewSurveyAnswer(responses, profileId) {
        try {
            this.responsesFromDb = await insertNewSurveyResponse(
                responses,
                profileId,
            )
            return this.responsesFromDb
        } 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 }