#!/usr/bin/env bash
#bash-written tictactoe game

#game save location
rc=$HOME/.local/share/bt3.rc
modename=('Local' 'Easy' 'Medium' 'Master' 'Online')

#(jojo) reference
help() {
        printf "%s\n"\
                "usage: bt3 [option] <mode>"\
                "Bash-written tictactoe game."\
                "OPTIONS:"\
                "  --help|-h       Show this help."\
                "  --version|-v    Show version."\
                "GAMEMODES:"\
                "  -1  Easy bot."\
                "  -2  Medium bot"\
                "  -3  Master bot."\
                "  -p  Play together on one device."\
                "  -o  Play online via...(In v1.1)"
        exit 0
}
version() {
        printf "%s\n" "bt3 v1.0" "Bash tictactoe game."
        exit 0
}

#option parcer
case $1 in
        --help|-h) help;;
        --version|-v) version;;
        -1|-2|-3|-p|-o) mode=$(echo $1 | sed 's/-//g');;
        *) echo 'Choose right game options.'; exit 1
esac

#ingame functions
printField() {
        clear
        for (( i=0 ; i<9 ; i=i+3 )); do
                echo "${session[$i]}${session[$(( i + 1 ))]}${session[$(( i + 2 ))]}"
        done
}
0() {
        while :; do
                printField
                read -n 1 -p '>> '
                if [[ ${session[$(( REPLY - 1 ))]} == '#' ]]; then
                        session[$REPLY-1]=$1
                        break
                fi
        done
}
1() {
        rand=$(( RANDOM % 9 ))
        while [[ ${session[$rand]} != '#' ]]; do
                if [[ $rand == 8 ]]; then
                        rand=0
                else
                        rand=$(( $rand + 1 ))
                fi
        done
        session[$rand]=$1
}
analyze() {
        for (( i=0 ; i<9 ; i=i+3 )); do
                checkField $i $(( i + 1 )) $(( i + 2 ))
        done
        for (( i=0 ; i<3 ; i++ )); do
                checkField $i $(( i + 3 )) $(( i + 6 ))
        done
        checkField {0 4 8, 2 4 6}
}
checkField() {
        if [[ "${session[$1]}"!='#' && "${session[$1]}"=="${session[$2]}" && "${session[$2]}"=="${session[$3]}" ]]; then
                printf "\nPlayer ${session[$1]} win at turn $turn\n" &&
                exit 0
        fi
}
#choose side
if ! source $rc; then
        for (( i=0 ; i<9 ; i++ )); do
                session[$i]='#'
        done
        select i in x o random; do
                case $i in
                        x|o) playside=$i; break;;
                        random)
                                if (( (RANDOM % 2) == 1 )); then
                                        playside=x
                                else
                                        playside=o
                                fi
                                break
                esac
        done
        if [[ $playside == 'x' ]]; then
                otherside='o'
        else
                otherside='x'
        fi
fi

#game
while :; do
        0 $playside
        analyze
        $mode $otherside
        analyze