#!/bin/sh

[ ! -d "$HOME/.cache/nmine" ] && mkdir -p "$HOME/.cache/nmine"
[ ! -f "$HOME/.cache/nmine/current-miner" ] && touch "$HOME/.cache/nmine/current-miner"
cat "$HOME/.cache/nmine/current-miner" > /dev/null || { echo "Error: no access to cache file"; exit 1; }
[ ! -d "$HOME/.config/nmine" ] && mkdir -p "$HOME/.config/nmine"
[ ! -f "$HOME/.config/nmine/config" ] && touch "$HOME/.config/nmine/config"
cat "$HOME/.config/nmine/config" > /dev/null || { echo "Error: no access to config file"; exit 1; }


[ -z "$(cat "$HOME/.config/nmine/config")" ] && echo "Error: config file is empty" && exit 1

helpMessage="Usage: nmine [option]
Options:
\tstart\t\tstart mining
\tstop\t\tstop mining
\tlist\t\tlist configured miners
\tchange [miner]\tchange mining software / coin
\thelp\t\tprint this help message"

getMiners() {
    grep "^miner" "$HOME/.config/nmine/config" | sed 's/^miner=//'
}

checkMinerConfig() {
    getMiners | grep -q "^$miner\$" || { printf "Error: miner '%s' not found
Exiting ...\n" "$miner"; exit 1; }
}

initCache () {
    miner="$(cat "$HOME/.cache/nmine/current-miner")"
    [ -z "$miner" ] && printf "Error: no miner selected, please run 'nmine change [miner]'\nExiting ...\n" && exit 1
}



[ -z "$1" ] && printf "Error: No Arguments given\n\n" && echo "$helpMessage" && exit 1

case "$1" in
    start)
        echo "Start mining ..."
        initCache
        checkMinerConfig
        cmd="$(grep -a1 "$miner" "$HOME/.config/nmine/config" | tail -n 1 | sed 's/^start=//')"
        eval "$cmd";;
    stop)
        echo "Stop mining ..."
        initCache
        checkMinerConfig
        processName="$(grep -a2 "$miner" "$HOME/.config/nmine/config" | tail -n 1 | sed 's/^stop=//')"
        echo "$processName"
        processID="$(pgrep -f "$processName")"
        echo "$processID"
        kill "$processID";;
    list)
        printf "Configured miners:\n"
        miner="$(cat "$HOME/.cache/nmine/current-miner")"
        [ -z "$miner" ] && getMiners && exit
        getMiners | sed "s/$miner/$miner (current)/";;
    change)
        echo "Changing miner ..."
        [ -z "$2" ] && printf "Error: Invalid Sytax\nExiting...\n" && exit
        miner="$2"
        checkMinerConfig
        echo "$miner" > "$HOME/.cache/nmine/current-miner"
        echo "Done";;
    help)
        echo "$helpMessage";;
    *)
        [ -z "$2" ] && printf "Error: Invalid Argument given:'%s'\n\n" "$1" &&
        echo "$helpMessage" && exit 1

        printf "Error: Invalid Arguments given:'%s'\n\n" "$@" &&
        echo "$helpMessage" && exit 1
esac