import lcm from './lcm'

const _log2 = Math.log2

const _log10 = Math.log10

const _log2_10 = _log2(10)

const _bitsPerByte = 8

const _totalOf = (numStrings, log2Risk) => {

if (numStrings == 0) { return 0 }

let N

if (numStrings < 1000) {

N = _log2(numStrings) + _log2(numStrings-1)

}

else {

N = 2 * _log2(numStrings)

}

return N + log2Risk - 1

}

const bits = (total, risk) => {

if (total == 0) { return 0 }

return _totalOf(total, _log2(risk))

}

// CxTBD Mark as obsolete

const bitsWithRiskPower = (total, rPower) => {

let log2Risk = _log2_10 * rPower

return _totalOf(total, log2Risk)

}

// CxTBD Mark as obsolete

const bitsWithPowers = (tPower, rPower) => {

let N = 0

if (tPower < 4) {

return bitsWithRiskPower(Math.pow(10, tPower), rPower)

}

else {

return (2 * tPower + rPower) * _log2_10 - 1

}

}

export default {

bits,

bitsWithRiskPower,

bitsWithPowers

}