const config = require('../../../db/data-generator/config.json')

const makeScoreLookup = (aspects, labels) => {
    const labelLookup = {}
    labels.forEach(label => (labelLookup[label.aspect_id] = label))

    const scoreLookup = {}
    aspects.forEach(aspect => {
        const key = labelLookup[aspect.aspect_id]
        scoreLookup[`${key.a}:${key.b}`] = {}
        Object.keys(aspect).forEach(aspect_id => {
            if (!labelLookup[aspect_id]) return
            const comp = labelLookup[aspect_id]
            const score = aspect[aspect_id]
            scoreLookup[`${key.a}:${key.b}`][`${comp.a}:${comp.b}`] = score
        })
    })
    return scoreLookup
}

const _isScorableResponse = res_key_id =>
    config.scoreKeys.includes(res_key_id) ? true : false

const scoreResponses = (seeker, potentialMatch, prescoreLookup) => {
    if (seeker.responses.length != potentialMatch.responses.length)
        return {
            error: `complete responses for profile: ${seeker.profile_id} unqeual to profile: ${potentialMatch.profile_id} | ${seeker.responses.length}:${potentialMatch.responses.length}`,
        }
    const aRes = seeker.responses.filter(res =>
        _isScorableResponse(res.response_key_id),
    )
    const bRes = potentialMatch.responses.filter(res =>
        _isScorableResponse(res.response_key_id),
    )

    const composite = []
    while (aRes.length + bRes.length > 0) {
        const mKey = resList => {
            let el = resList.shift()
            let pair = el.val
            el = resList.shift()
            return `${pair}:${el.val}`
        }
        composite.push(prescoreLookup[mKey(aRes)][mKey(bRes)])
    }
    const scoreAvg = composite.reduce((a, b) => a + b) / composite.length
    return {
        total: Math.round(scoreAvg),
        aspects: composite,
    }
}

const scoreAll = (profileList, userProfile, prescoreLookup) => {
    return profileList.map(profile => {
        return {
            // Uncomment to return the whole profile
            // ...profile,
            profile_id: profile.profile_id,
            score: scoreResponses(userProfile, profile, prescoreLookup),
            distance: profile.distance,
        }
    })
}

module.exports = {
    _isScorableResponse,
    scoreResponses,
    makeScoreLookup,
    scoreAll,
}