Archery Tournament

archeryTournament = (input) => {
    let points = 0;
    let targets = input.shift().split('|').map(Number);
    while((line = input.shift()) !== 'Game over') {
        if(line === 'Reverse') {
            targets.reverse();
        } else {
            let [ direction, index, length ] = line.split(' ')[1].split('@');
            index = Number(index);
            length = Number(length);
            if(targets[index] === undefined) {
                continue;
            }

            while(length-- > 0) {
                index = index + (direction === 'Left' ? -1 : 1);
                if(index === -1) {
                    index = targets.length - 1;
                } else if (index === targets.length) {
                    index = 0;
                }
            }

            points += targets[index] >= 5 ? 5 : targets[index];
            targets[index] = (value = targets[index] - 5) >= 0 ? value : 0;
        }
    }

    console.log(targets.join(' - '));
    console.log(`Iskren finished the archery tournament with ${points} points!`);
};