const fs = require('fs')
const cosineSimilarity = require('compute-cosine-similarity')
const mockOutputPath = './db/_generated.js'

// Insert here how many users you would like to generate:
const total = 10
let extraProfilesToGenerate = 0

// Amount of responses for a complete survey
const questions = 13

// Seekers per 100 profiles
const percentageOfSeekers = 90

// Values for responses
const possibleResponses = {
    not_important: '120',
    some_what_important: '140',
    important: '160',
    very_important: '180',
    extremely_important: '200',
    mandatory: '400',
}

const possibleZipcodes = [
    '90065', // Glassel
    '90012', // Chinatown
    '90240', // Downey
    '91030', // South Pasadena
    '91201', // Glendale
    '91399', // Woodland Hills
    '91401', // Van Nuys
    '90840', // Long Beach
    '91001', // Altadena
    '91011', // La Canada Flintridge
    '97075', // Beaverton
]

// Helper functions
const randomNumber = max => {
    return Math.floor(Math.random() * max) < 1
        ? 1
        : Math.floor(Math.random() * max)
}

const randomValFrom = arr => arr[randomNumber(arr.length)]
const randomEmail = (length = 5) => {
    let chars =
        'abcdefghijklmnopqrstuvwxyz-_abcdefghijklmnopqrstuvwxyz0123456789'
    let str = ''
    for (let i = 0; i < length + randomNumber(9); i++) {
        str += chars.charAt(Math.floor(Math.random() * chars.length))
    }
    const suffixs = [
        '@gmail.com',
        '@aol.com',
        '@yahoo.com',
        '@apple.com',
        '@hotmail.com',
        '@rocket-mail.com',
        '@mail.com',
    ]
    return str + randomValFrom(suffixs)
}
const randomName = (length = 4) => {
    let chars = 'aeiouaeiouabcdefghijklmnoprstuvwyabcdefghijklmnopqrstuvwxyz'
    let str = ''
    for (let i = 0; i < length + randomNumber(9); i++) {
        str += chars.charAt(Math.floor(Math.random() * chars.length))
    }
    return str
}

const generate = (classObj, amount, meta) => {
    const instances = []
    for (let i = 0; i < amount; i++) {
        instances.push(new classObj(i + 1, meta))
    }
    return instances
}

class User {
    constructor(id) {
        this.user_id = id
        this.user_name = ''
        this.user_email = ''
        this.is_admin = false
        this.is_poster = false
    }
}
class Profile {
    constructor(id, override) {
        this.user_id = override ? override.user_id : id
        this.profile_id = override ? override.profile_id + id : id
    }
}
class Response {
    constructor(id) {
        this.response_id = id
        this.profile_id = null
        this.response_key_id = null
        this.val = null
    }
}

const users = generate(User, total)
users.forEach(user => {
    user.is_poster = randomNumber(100) > percentageOfSeekers ? 1 : 0
    if (user.is_poster) {
        extraProfilesToGenerate = extraProfilesToGenerate + randomNumber(2)
    }
    user.user_name = randomName() + ' ' + randomName()
    user.user_email = randomEmail()
})
let jobPosterIds = users
    .filter(user => user.is_poster > 0)
    .map(user => user.user_id)

// Guarentee ONE job poster
if (!jobPosterIds.length) {
    randomValFrom(users).is_poster = 1
    jobPosterIds = users
        .filter(user => user.is_poster > 0)
        .map(user => user.user_id)
}

const profiles = generate(Profile, total)

// Generate extra job posting profiles
// attributed to random user.is_poster === true
// TODO: Clean this up. Hard to read...
if (extraProfilesToGenerate > 0) {
    let extras = []
    for (let l = 0; l < extraProfilesToGenerate; l++) {
        const generatedExtraProfiles = generate(Profile, 1, {
            user_id:
                jobPosterIds.length > 1
                    ? randomValFrom(jobPosterIds)
                    : jobPosterIds[0],
            profile_id: profiles.length + l,
        })
        extras = [...extras, ...generatedExtraProfiles]
    }
    extras.forEach(profile => profiles.push(profile))
}

// Generate responses, then fill in details
const responses = generate(
    Response,
    (total + extraProfilesToGenerate) * questions,
)
profiles.forEach((profile, i) => {
    const startingIndex = i * questions
    for (let k = 0; k < questions; k++) {
        const resToEdit = responses[startingIndex + k]
        resToEdit.response_key_id = k + 1
        resToEdit.profile_id = profile.profile_id
        resToEdit.val =
            k + 1 == questions
                ? randomValFrom(possibleZipcodes)
                : randomValFrom(Object.values(possibleResponses))
    }
})

/**
 * Score all the profiles!
 */
const scoreResponses = (seeker, potentialMatch) => {
    const seekerResponses = responses
        .filter(response => response.profile_id == seeker.profile_id)
        .filter(response => response.val.length < 4)

    const potentialMatchResponses = responses
        .filter(response => response.profile_id == potentialMatch.profile_id)
        .filter(response => response.val.length < 4)

    const checkValCb = res => {
        const val = parseInt(res.val)
        return isNaN(val) ? 0 : val
    }
    return Math.floor(
        cosineSimilarity(
            seekerResponses.map(checkValCb),
            potentialMatchResponses.map(checkValCb),
        ) * 1000,
    )
}
const scoreProfile = (profile, potentialMatchList) => {
    const scored = potentialMatchList.map(profileToCompare => {
        return {
            match_queue_id: null,
            profile_id: profile.profile_id,
            target_id: profileToCompare.profile_id,
            is_deleted: false,
            score: scoreResponses(profile, profileToCompare),
        }
    })
    return scored.sort((a, b) => a.score - b.score)
}
const scoreAll = () => {
    let scores = []
    const posterProfiles = profiles.filter(profile =>
        jobPosterIds.includes(profile.user_id),
    )
    const seekerProfiles = profiles.filter(
        profile => !jobPosterIds.includes(profile.user_id),
    )
    seekerProfiles.forEach(seeker => {
        const scored = scoreProfile(seeker, posterProfiles)
        scores = [...scored, ...scores]
    })
    posterProfiles.forEach(poster => {
        const scored = scoreProfile(poster, seekerProfiles)
        scores = [...scored, ...scores]
    })
    return scores.reverse()
}
const match_queues = scoreAll().map((score, i) => {
    score.match_queue_id = i + 1
    // Comment out to see the score
    delete score.score
    return score
})

/**
 * Our output format
 */
const outputDataObject = { users, profiles, responses, match_queues }

const jobPostings = profiles.filter(profile =>
    jobPosterIds.includes(profile.user_id),
).length
const jobPosters = users.filter(user => user.is_poster > 0).length
const header = `/**
 * GENERATED MOCK SIIMEE DATA
 * Generated at: ${Date.now()}
 * ---
 * ${jobPostings} positions listed by ${jobPosters} job posters
 * ${total + extraProfilesToGenerate - jobPostings} candidate profiles by ${
    total + extraProfilesToGenerate - jobPostings
} job seekers
 * ---
 * ${total + extraProfilesToGenerate} Profiles
 * ${total} Users
 */
`
const write = async () => {
    await fs.writeFile(mockOutputPath, '', () => {})
    fs.appendFile(
        mockOutputPath,
        header + 'module.exports = ' + JSON.stringify(outputDataObject),
        err => {
            if (err) {
                console.error(err)
                return
            }
        },
    )
}
write()