const Schmervice = require('@hapipal/schmervice')
const haversine = require('haversine')
const config = require('../../../db/data-generator/config.json')
const profiler = require('./profiler')
const scoring = require('./scorer')
const zipcoder = require('./zipcoder')

module.exports = class ProfileService extends Schmervice.Service {
    constructor(...args) {
        super(...args)
        /** Scores available in the db to map against score indices*/
        this.scoreLookup = {}
        /** Tags available in the db to map against tag_associations*/
        this.tagLookup = {}
        // this.responseKeyLookup = ResponseKey.query()
    }
    async _setScoreLookup() {
        if (!Object.keys(this.scoreLookup).length) {
            const { Aspect, AspectLabel } = this.server.models()
            const aspects = await Aspect.query()
            const labels = await AspectLabel.query()
            this.scoreLookup = scoring.makeScoreLookup(aspects, labels)
        }
    }
    async _setTagLookup() {
        /** Grab tag descriptions if they do NOT exist: Needed once per app load */
        if (Object.keys(this.tagLookup).length) return
        const { Tag } = this.server.models()
        const allTagDescriptions = await Tag.query()
        allTagDescriptions.forEach(desc => {
            if (!desc.is_active) return
            this.tagLookup[desc.tag_id] = desc
        })
    }
    /**
     * Internal method to get list of profile_ids for this user
     * @param {number} userId
     * @returns {Array} List of all profile_ids for user
     */
    async _getProfileIdsForUserId(userId) {
        const { Profile } = this.server.models()

        /** Grab every Profile associated with this id */
        const allProfiles = await Profile.query().where('user_id', userId)

        /** Copy a list of the just the Profiles */
        const profileIdsToGrab = allProfiles.map(profile => profile.profile_id)

        /** Uncomment to dedupe the list just in case */
        return [...new Set(profileIdsToGrab)]
    }

    async getProfile(profileId) {
        const { Profile } = this.server.models()
        await this._setTagLookup()
        const matchingProfile = await Profile.query()
            .where('profile_id', profileId)
            .first()
            .withGraphFetched('tags')
            .withGraphFetched('responses')
            .withGraphFetched('user')
        matchingProfile.tags = matchingProfile.tags.map(
            tag => this.tagLookup[tag.tag_id],
        )
        const complete = new profiler.CompleteProfile(matchingProfile, true)
        // TODO: Refactor to use this.setDefaults(), currently does not play
        // nice with reveal functionality
        return complete
        // return this.setDefaults(complete)
    }

    async getCompleteProfilesFor(userId, type) {
        const { Profile } = this.server.models()
        await this._setTagLookup()

        const dedupedProfileIds = await this._getProfileIdsForUserId(userId)

        const profilesEntries = await Profile.query()
            .whereIn('profile_id', dedupedProfileIds)
            .withGraphFetched('tags')
            .withGraphFetched('responses')
            // CHECKTHIS: Added this because we added user.user_name to CompleteProfile
            // so without this, we get undefined user_name
            .withGraphFetched('user')

        return profiler.makeCompleteFromProfileEntries(
            profilesEntries,
            type,
            this.tagLookup,
        )
    }

    async getProfilesFor(profileIdArray, type, includeResponses = true) {
        const { Profile } = this.server.models()
        await this._setScoreLookup()
        await this._setTagLookup()

        // profilesEntries is profiles in dataaspect_labelsbase row order
        const profilesEntries = await Profile.query()
            .whereIn('profile_id', profileIdArray)
            .withGraphFetched('tags')
            .withGraphFetched('responses')
            .withGraphFetched('user')

        // taking the info from profilesEntries
        // to repack into completeProfiles
        // in same order as profileIdArray
        return profiler.makeOrderedCompleteProfiles(
            profileIdArray,
            profilesEntries,
            type,
            includeResponses,
            this.tagLookup,
        )
    }

    /**
     * Save responses in a profile
     * @param {number} userId
     * @param {Array} responses
     * @returns {object}
     */
    async saveResponsesCreateProfileFor(userId, responses, txn) {
        const { Profile, Response } = this.server.models()

        const profile = await Profile.query(txn).insert({
            user_id: userId,
        })
        for (const responseToSave of responses) {
            /**
             * Convert indexes to actual score values
             * Using using the input and converting to index
             * of the generated possible prescore array in config
             * DUPLICATE:See saveResponseForProfile() line 343
             */
            let convertedResponse = responseToSave
            if (scoring._isScorableResponse(responseToSave.response_key_id)) {
                // Convert -3 to 0, 0 to 3, 3 to 6
                const offset = (config.scoreVals.length - 1) / 2
                const indexFromInput = parseInt(responseToSave.val) + offset
                convertedResponse.val =
                    config.scoreVals[indexFromInput].toString()
            }

            const responseInfo = {
                profile_id: profile.id,
                response_key_id: convertedResponse.response_key_id,
                val: convertedResponse.val,
            }
            await Response.query(txn).insert(responseInfo)
        }
        //** Work around for HAPI returning profile_id as id */
        return { user_id: profile.user_id, profile_id: profile.id }
    }

    /** Update responses in place
     * @param {number} profileId
     * @param {Array} responses
     * @returns {Array} updated responses
     */
    async updateResponsesInProfile(profileId, responses, txn) {
        const { Response } = this.server.models()
        for (const responseToSave of responses) {
            await Response.query(txn)
                .update({
                    response_id: responseToSave.response_id,
                    profile_id: responseToSave.profile_id,
                    response_key_id: responseToSave.response_key_id,
                    val: responseToSave.val,
                })
                .where({
                    profile_id: profileId,
                })
                .where({
                    response_id: responseToSave.response_id,
                })
        }
        return await Response.query(txn).where({
            profile_id: profileId,
        })
    }

    /** Add response
     * @param {Object} response to save
     * @returns {null} updated responses
     * @returns {Array} updated responses
     */
    async saveResponseForProfile(profileId, responseToSave) {
        const { Response } = this.server.models()
        let allResponses = await Response.query().where({
            profile_id: profileId,
        })

        // Delete matches
        // ?:Maybe bad idea
        const matchingResponses = allResponses.filter(
            response =>
                response.response_key_id == responseToSave.response_key_id,
        )
        if (matchingResponses.length > 0) {
            const alreadyAnswered = matchingResponses.map(
                matchingRes => matchingRes.response_key_id,
            )
            await Response.query()
                .where({ profile_id: profileId })
                .delete()
                .whereIn('response_key_id', alreadyAnswered)
        }

        /**
         * Convert indexes to actual score values
         * Using using the input and converting to index
         * of the generated possible prescore array in config
         */
        let convertedResponse = responseToSave
        if (scoring._isScorableResponse(responseToSave.response_key_id)) {
            // Convert -3 to 0, 0 to 3, 3 to 6
            const offset = (config.scoreVals.length - 1) / 2
            const scoreFromInput = parseInt(responseToSave.val) + offset
            const scoreFromConfig = config.scoreVals.indexOf(scoreFromInput)
            if (scoreFromConfig < 0) {
                console.error('score not found in possible config responses')
            }
            convertedResponse.val = scoreFromConfig.toString()
        }

        await Response.query().insert(convertedResponse)
        return allResponses
    }

    /**
     * Sets default profile attributes
     * @param {object} complete
     * @returns {object} updated profile
     */
    setDefaults(complete) {
        let defaultValues = {
            user_email: 'hidden@email.com',
            user_name: 'Hidden Name',
        }

        let defaultProfile = {
            ...complete,
            user_email: defaultValues.user_email,
            user_name: defaultValues.user_name,
        }
        console.log('---')
        console.log('defaultProfile: ', defaultProfile.user_email)
        if (!complete.reveal.length) return defaultProfile // nothing to reveal

        // swap out values of keys that are not found as complete.reveal.tag.tag_description values
        for (let [attribute, defaultVal] of Object.entries(defaultValues)) {
            if (
                typeof complete.reveal.find(
                    tag => tag.tag_description == attribute,
                ) == 'undefined'
            )
                complete[attribute] = defaultVal
        }
        console.log('complete: ', complete.user_email)

        return complete
    }

    /**
     * Delete a profile
     * @param {number} userId
     * @param {number} profileId
     * @returns
     */
    async deleteProfile(userId, profileId) {
        const { Profile } = this.server.models()

        const dedupedGroupings = await this._getProfileIdsForUserId(userId)

        /** Do NOTHING if NOT in Grouping */
        if (!dedupedGroupings.includes(profileId)) return

        return await Profile.query().delete().where('profile_id', profileId)
    }

    /**
     * Score a profile
     * @param {number} profileId
     * @returns {Array} Ordered and scored Profiles
     */
    async scoreProfilesFor(profileId, maxDistance, distanceUnit) {
        const { Profile } = this.server.models()

        await this._setScoreLookup()

        // Our User Profile to score for
        const userProfile = await Profile.query()
            .findOne('profile_id', profileId)
            .withGraphFetched('responses')
            .withGraphFetched('user')

        // Move unneeded responses
        const userZip = zipcoder.getZipCodeFromProfile(userProfile)

        // Find all Profiles that are NOT of our userProfile.type
        // ie. If userProfile.type == seeker, then find: poster
        let profileIdsOfOppositeType = await Profile.query()
            .withGraphFetched('responses')
            .withGraphFetched('user')
        // TODO: Let Objection optimize this
        const isPosterOpposite = userProfile.user.is_poster == 1 ? 0 : 1
        profileIdsOfOppositeType = profileIdsOfOppositeType
            .filter(profile => {
                return profile.user.is_poster == isPosterOpposite
            })
            .filter(profile => {
                // Only include profiles that included zipcode response
                return zipcoder.getZipCodeFromProfile(profile) ? true : false
            })

        const profilePlusDistance = await Promise.all(
            profileIdsOfOppositeType.map(async profile => {
                const targetZip = zipcoder.getZipCodeFromProfile(profile)

                if (!userZip || !targetZip)
                    return { ...profile, distance: [9999, distanceUnit] }

                const distance = await this._compareDistance(
                    userZip,
                    targetZip,
                    distanceUnit,
                )
                return {
                    ...profile,
                    distance: [distance.toFixed(2), distanceUnit],
                }
            }),
        )

        const distanceFilteredProfiles = zipcoder.filterByDistance(
            profilePlusDistance,
            maxDistance,
        )
        const scoredProfilesWithDistance = scoring.scoreAll(
            distanceFilteredProfiles,
            userProfile,
            this.scoreLookup,
        )
        // Order by score
        return scoredProfilesWithDistance.sort(
            (a, b) => b.score.total - a.score.total,
        )
    }

    /**
     * Use the db for zipcode info
     * @param {string} zipCode
     * @param {object}
     */
    async _latLonForZip(zipCode) {
        const { ZipCode } = this.server.models()
        const zipInfo = await ZipCode.query().findOne(
            'zip_code_id',
            parseInt(zipCode),
        )
        if (!zipInfo) {
            console.error('zip:', zipCode)
        }
        return {
            latitude: parseFloat(zipInfo.latitude),
            longitude: parseFloat(zipInfo.longitude),
        }
    }
    /**
     * Get the distance between two zipcodes
     * using the haversine formula
     * @param {string} start_zip
     * @param {string} end_zip
     * @param {number} distance in miles
     */
    async _compareDistance(start_zip, end_zip, distanceUnit) {
        if (!start_zip || !end_zip || isNaN(start_zip) || isNaN(end_zip)) return
        const start = await this._latLonForZip(start_zip)
        const end = await this._latLonForZip(end_zip)
        return haversine(start, end, { unit: distanceUnit })
    }

    /**
     * Use the db to grab tag associations
     * by profile and match them to tag types
     * @param {number} profileId
     * @param {object}
     */
    async getTagsFor(profileId, groupingId, category) {
        const { TagAssociation } = this.server.models()
        await this._setTagLookup()
        let associations = groupingId
            ? await TagAssociation.query()
                  .where('grouping_id', groupingId)
                  .andWhere('profile_id', profileId)
            : await TagAssociation.query().andWhere('profile_id', profileId)
        return associations
            .map(assoc => ({
                ...assoc,
                tag: this.tagLookup[assoc.tag_id],
            }))
            .filter(tagWithAssoc => {
                return category
                    ? tagWithAssoc.tag.tag_category == category
                    : true
            })
    }

    /**
     * Use the db to grab tag associations
     * by profile, grouping, tag, and insert
     * it if it already exists
     * @param {object} association
     */
    async revealProfileInfo(association) {
        const { TagAssociation } = this.server.models()

        const existingAssociations = await TagAssociation.query()
            .where('profile_id', `${association.profile_id}`)
            .where('grouping_id', `${association.grouping_id}`)
            .where('tag_id', `${association.tag_id}`)
            .where('is_deleted', 0)
        if (!existingAssociations.length) {
            await TagAssociation.query().insert(association)
            return await this.getTagsFor(association.profile_id)
        } else {
            return console.error('tag association already exists')
        }
    }
}