lotta.js

const moment = require("moment");
const crypto = require('crypto')

const RAW_DATA = [{"d":"2020.04.11","v":[2,5,14,28,31,32,20]},{"d":"2020.04.12","v":[2,5,14,28,31,32,20]}]

const DEFAULT_DATE_FORMAT = "YYYY.MM.DD"
const DEFAULT_REPEAT = 100

function calcPowerpack(start, end) {
    let start_date = moment(start, DEFAULT_DATE_FORMAT).startOf('day'), 
        end_date = moment(end, DEFAULT_DATE_FORMAT).endOf('day'),
        powerpack = Array.from(new Array(45),()=>DEFAULT_REPEAT)

    RAW_DATA.forEach(e => {
        let date = moment(e.d, DEFAULT_DATE_FORMAT)

        if (date.isBetween(start_date, end_date)) {
            e.v.forEach(v => {
                powerpack[v]++
            })
        }     
    })

    let pureBox = []

    for(const [powerIdx, powerVal] of powerpack.entries()) {
        for(var i = 0; i < powerVal; i++) {
            pureBox.push(powerIdx + 1)
        }
    }

    let pickBox = []

    for(let pickIdx = 0; pickIdx < 6; pickIdx++) {
        var picked = pureBox[Math.round((pureBox.length - 1) * (parseInt(crypto.randomBytes(1).toString('hex'), 16) / 255))]
        
        pureBox = pureBox.filter(v => v != picked)

        pickBox.push(picked)
    }

    return pickBox.sort((a, b) => a - b)
}

function howManyWin(pickSet) {
    let winResult = [0, 0, 0, 0] // least 4 matched

    RAW_DATA.forEach(e => {
        let mat = e.v.reduce((p, n) => p + (pickSet.includes(n) ? 1 : 0), 0)

        if (mat > 3) {
            winResult[mat - 3]++
        }
    })

    return winResult
}

for(let i = 0; i < 5; i++) {
    let pp = calcPowerpack("2015.03.01", "2020.12.01");
    console.log(pp, "\t\t", howManyWin(pp))
}