#!/bin/bash
 
# MartingaleSimulator v2
 
startBetAmount=1
startBankAmount=10000
 
#if [[ ${#} -eq 2 ]]; then
#    startBetAmount=${1}
#    startBankAmount=${2}
#else
#    echo "Enter starting bet (As positive non-zero integer)"
#    read -r startBetAmount
 
#    echo "Enter bank amount  (As positive non-zero integer)"
#    read -r startBankAmount
#fi
 
numBetsCast=0
currentBetAmount=1
currentBankAmount="${startBankAmount}"
 
greatestWin=0
greatestWinBetNumber=0
biggestLoss=0
greatestLossBetNumber=0
 
#echo numBetsCast=$numBetsCast
echo currentBetAmount=$currentBetAmount
echo currentBankAmount=$currentBankAmount
 
echo "Running simlation"
 
while (( "${currentBankAmount}" >= "${currentBetAmount}" )); do
 
    numBetsCast=$((${numBetsCast} + 1))
 
    coinToss=$((${RANDOM} % 2))
 
    if (( ${coinToss} == 0 )); then
        #echo "We won!!!!"
        currentBankAmount=$(("${currentBankAmount}" + "${currentBetAmount}"))
 
        if (( ${currentBankAmount} > ${greatestWin} )); then
            greatestWin=${currentBankAmount}
            greatestWinBetNumber=${numBetsCast}
            #printf "Bet ${greatestWinBetNumber} put our bank at \$${greatestWin}\n"
        fi
 
        currentBetAmount=1
 
    else
        #echo "We lost!!! Double the bet and roll again!"
        currentBankAmount=$(("${currentBankAmount}" - "${currentBetAmount}"))
        newBetAmount=$(("${currentBetAmount}" * 2))
 
        if (( ${currentBetAmount} > ${biggestLoss} )); then
            biggestLoss=${currentBetAmount}
            greatestLossBetNumber=${numBetsCast}
            printf "Bet %-10b is our biggest loss yet!! Doubling bet to %-10b. Current balance is %-10b\n" "${greatestLossBetNumber}" "\$${newBetAmount}" "\$${currentBankAmount}"
        fi
 
        currentBetAmount="${newBetAmount}"
 
    fi
done
 
echo "Cannot afford to double bet to \$${currentBetAmount}. You are forced to abandon the martingale strategy since you only have \$${currentBankAmount} left."
echo "You have cast a total of ${numBetsCast} bets."
echo "Should have quit at bet ${greatestWinBetNumber} when you were ahead by \$$((${greatestWin} - ${startBankAmount}))"

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