#!/bin/bash

check_dependancies()
{
    if [ $# -eq 0 ] ; then
        if [[ $(bash --version | head -n 1 | cut -f 1 -d "." | tr -d "[:alpha:]") < "4" ]] ; then
            echo "This game requires bash version 4 or higher. Earlier versions may not be able to successfully run this code."
        fi
        if ! hash sox &> /dev/null ; then
            echo "The program sox is required but does not appear to be installed on your system. Please install sox and try
again."
            exit 1
        fi
    fi
    for i in $@ ; do
        if ! hash $i &> /dev/null ; then
            echo "The program $i is required but does not appear to be installed on your system. Please install $i and try
again."
            exit 1
        fi
    done
}

initialize_players()
{
    i=1
    while [ $i -le $1 ] ; do
        player[$i]=0
        let i++
    done
}

score_keeper()
{
    #Initialize currentScore for the player to 0
    currentScore=0
    #clear the continue variable
    unset continue
    #Show current player
    i=1
    while [ $i -lt $columns ] ; do
        echo -n "-"
        let i++
    done
    echo "-"
    echo "It is player $1's turn. Player $1 has ${player[$1]} total points."
    #while the die roll is not 1 keep rolling and keep track of the score
    while [ "${continue^}" != "Q" ] ; do
        dieRoll=$(rolldice 1)
        play -qV0 "sounds/die.ogg" remix v0.$(rolldice 1d4+4) v0.$(rolldice 1d4+4)
        echo -n "player $1 rolled a $dieRoll "
        if [ $dieRoll -ne 1 ] ; then
            currentScore=$(echo "$currentScore + $dieRoll" | bc)
            echo "for a score of $currentScore."
            if [ $1 -eq 2 -a "$cpu" == "true" ] ; then
                continue="$(shuf -n 1 -e "q" "a" "b" "c" "d")"
            else
                read -n 1 -p "Press any key to roll again or q to stop and bank your current score." continue
            fi
            echo
        else
            echo "and loses their score of $currentScore."
            play -qV0 sounds/lose.ogg
            currentScore=0
            continue="q"
        fi
        if [ "${continue^}" == "Q" -o $currentScore -eq 0 ] ; then
            player[$1]=$(echo "${player[$1]} + $currentScore" | bc)
            echo "player $1's turn is over. Player $1's new score is ${player[$1]}."
        fi
        if [ ${player[$1]} -ge 100 ] ; then
            echo "Player $1 WINS!!!"
            play -qV0 sounds/win.ogg
            exit 0
        fi
    done
}

check_dependancies
check_dependancies rolldice
#get terminal width
columns=$(tput cols)
#find out how many players there are
if [ $# -gt 1 ] ; then
    echo "Usage: $0 or $0 number of players."
    exit 1
fi
if [ $# -eq 1 ] ; then
    if ! [[ "$1" =~ ^[0-9]+$ ]] ; then
        echo "The number of players must be a number, 2 or greater."
        exit 1
    fi
    if [ $1 -lt 2 ] ; then
        echo "The number of players must be a number, 2 or greater."
        exit 1
    fi
    totalPlayers=$1
else
    totalPlayers=2
    cpu=true
fi
initialize_players $totalPlayers
#determine who goes first.
playerIndex=$(rolldice 1d${#player[@]})
while [ $playerIndex -gt 0 ] ; do
    score_keeper $playerIndex
    let playerIndex++
    if [ $playerIndex -gt ${#player[@]} ] ; then
        playerIndex=1
    fi
done
exit 0