Man-O-War

function manageBattleBetweenShips(input) {
    let pirateShip = input.shift().split('>').map(Number);
    let warShip = input.shift().split('>').map(Number);
    let maxHealthCapacity = Number(input.shift());
    for (let element of input) {
        if (element === 'Retire') {
            break;
        }
        let el = element.split(' ');
        let currentCommand = el.shift();
        el = el.map(Number);
        switch (currentCommand) {
            case 'Fire': let [index, warShipDamage] = el;
                if (warShip[index]) {
                    warShip[index] - warShipDamage < 0 ? warShip[index] = 0 : warShip[index] -= warShipDamage;
                }

                if (warShip.includes(0)) {
                    console.log('You won! The enemy ship has sunken.');
                    return;
                }

                break;
            case 'Defend': let [startIndex, endIndex, pirateShipDamage] = el;
                if (pirateShip[startIndex] && pirateShip[endIndex]) {
                    for (let i = startIndex; i <= endIndex; i++) {
                        pirateShip[i] - pirateShipDamage <= 0 ? pirateShip[i] = 0 : pirateShip[i] -= pirateShipDamage;
                    }
                }
                if (pirateShip.includes(0)) {
                    console.log('You lost! The pirate ship has sunken.');
                    return;
                }

                break;
            case 'Repair': let [repairIndex, health] = el;
                if (pirateShip[repairIndex]) {
                    pirateShip[repairIndex] + health > maxHealthCapacity ? pirateShip[repairIndex] = maxHealthCapacity : pirateShip[repairIndex] += health;
                }

                break;
            case 'Status': let allSectionsForRepair = pirateShip.filter(a => a < maxHealthCapacity * 0.2);
                console.log(`${allSectionsForRepair.length} sections need repair.`);
                break;
        }
    }

    let pirateShipStatus = pirateShip.reduce((a, b) => a + b, 0);
    let warShipStatus = warShip.reduce((a, b) => a + b, 0);
    console.log(`Pirate ship status: ${pirateShipStatus}\nWarship status: ${warShipStatus}`);
}