package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	rand.Seed(time.Now().UTC().UnixNano())

	var balance, investedPercentage, winningPercentage float64
	balance = 100
	investedPercentage = 0.80
	winningPercentage = 0.70
	discreteCompoundingPeriods := 200
	numSimulations := 16
	outputChannel := make(chan float64)

	for i := 0; i < numSimulations; i++ {
		go simulation(balance, investedPercentage, winningPercentage, discreteCompoundingPeriods, outputChannel)
	}

	for i := 0; i < numSimulations; i++ {
		fmt.Println(<-outputChannel)
	}

}

func simulation(startingBalance, investedPercentage, winningPercentage float64, discreteCompoundingPeriods int, outputChannel chan float64) {
	balance := startingBalance
	for i := 0; i < discreteCompoundingPeriods; i++ {
		investedAmount := balance * investedPercentage
		if rand.Float64() <= winningPercentage {
			// you win
			balance += investedAmount
		} else {
			// you lose
			balance -= investedAmount
		}
	}
	outputChannel <- (balance / startingBalance)
}