const _ = require('lodash')

exports.calculateAvgScore = (...scores) => {
  return avgScore = scores.reduce((total, score) => total += score) / scores.length;
}

exports.calculateScoreRange = (transitionRange, regionVal, sLowVal, sHighVal) => {
  //console.log('scores.calculateScoreRange:', min, max, multiplier, regionVal, sLowVal, sHighVal)
  // return full score when in range
  if (regionVal >= sLowVal && regionVal <= sHighVal) return 10;
  // choose value with smallest distance
  let sVal = Math.abs(regionVal - sLowVal) < Math.abs(regionVal - sHighVal) ? sLowVal : sHighVal;
  return this.calculateScore(transitionRange, regionVal, sVal);
}

exports.calculateScore = (transitionRange, regionVal, searchVal) => {
  let score = 1 - (Math.abs(searchVal - regionVal) / transitionRange);
  return (score) * 10;
  //return score <= 0 ? 0 : score * 10;
}

exports.linear = function (x, exponent) {
  if (x < 0) return 0
  if (x > 10) return 10
  return x
}

exports.easeOut = function (x, exponent) {
  if (x < 0) return 0
  if (x > 10) return 10
  return (1 - Math.pow(1 - (x / 10), exponent)) * 10
}

exports.easeInOut = function (sc, exponent) {
  const x = (sc ) / 10
  // console.log(sc, x);
  if (x<0) return 0
  if (x>1) return 10
  return x < 0.5 ? Math.pow(2, exponent-1) * Math.pow(x,exponent) * 10 : (1 - Math.pow(-2 * x + 2, exponent)/2) * 10
}

exports.easeInOutAsymmetric = function (sc, exponent) {
  const x = (sc ) / 10
  // console.log(sc, x);
  if (x<0) return 0
  if (x>1) return 10
  return x < 0.5 ? (2 * x) - 0.5 * 10 : (1 - Math.pow(-2 * x + 2, exponent)/2) * 10
}

exports.sigmoid = function (x, exponent) {
  // const sigm = (1 / (1 + Math.pow(Math.E, 5 * -x))) * 10 + 5
  // const sigm = 10 / (1 + Math.pow(Math.E, 1.2 * -x + 6))
  const sigm = 10 / (1 + 8 * Math.pow(Math.E, 3/4 * -x))
  console.log('sigmoid (IN/OUT):', _.round(x,3), _.round(sigm, 3))
  return sigm
}

exports.increaseTransitionForHighValues = function (transitionRange, searchVal) {
  //console.log(transitionRange);
  // console.log(transitionRange);
  // console.log(((Math.pow(searchVal / 20, 2) / 100) + 1));
  // console.log(((Math.pow(searchVal / 20, 2) / 100) + 1) * transitionRange);
  let transFactor = ((Math.pow(searchVal / 20, 2) / 100) + 1)
  
  return transFactor >= 4 ? 4 * transitionRange : transFactor * transitionRange
}