let input = `0: 3
1: 2
4: 4
6: 4`

let regex = /(\d+):\s(\d+)/s;

let inputArray = input.split('\n')

let firewall = [];
firewall = createFirewall();

// Part One
console.log("Part One: ", goThroughFirewall(firewall, "severity"));


let packetDelay;
let passed = false;

while (!passed){
    if (packetDelay == undefined){
        packetDelay = 0;
    }
    else {
        packetDelay++;
    }
    resetFirewall(firewall);
    for (let idx = 0; idx < packetDelay; idx++){
        moveScanners(firewall);
    }
    passed = !goThroughFirewall(firewall, "delay")
}
console.log("Part Two: ", packetDelay);




function goThroughFirewall(firewall, task){
    let packetPosition = 0;
    let severity = 0;
    let caught = false;
    for (let idx = 0; idx < firewall.length; idx++){
        if (firewall[packetPosition] != undefined){
            if (firewall[packetPosition].scanner === 1) {
                // you are caught now
                severity = severity + (firewall[packetPosition].range * firewall[packetPosition].depth);
                caught = true;
            }
        }
        moveScanners(firewall);
        packetPosition++;
    }
    switch (task){
        case "severity":
            return severity;
        case "delay" :
            return caught;
    }
}


function createFirewall(){
    let firewall = [];
    for (let idx = 0; idx < inputArray.length; idx++){
        const layer = regex.exec(inputArray[idx]);
        const layerDepth = layer[1];
        const layerRange = layer[2];
        firewall[layerDepth] = {
            depth: layerDepth,
            range: layerRange,
            scanner: 1,
            scannerDown: true
        }
    }
    return firewall;
}


function moveScanners(firewall){
    for (let idx = 0; idx < firewall.length; idx++){
        if (firewall[idx] != undefined){
            if (firewall[idx].scannerDown){
                firewall[idx].scanner++;
            }
            else {
                firewall[idx].scanner--;
            }
            if (firewall[idx].scanner >= firewall[idx].range || firewall[idx].scanner <= 1){
                firewall[idx].scannerDown = !firewall[idx].scannerDown
            }
        }
    }
}


function resetFirewall(firewall){
    for (let idx = 0; idx < firewall.length; idx++){
        if (firewall[idx] != undefined){
            firewall[idx].scanner = 1;
            firewall[idx].scannerDown = true;
        }
    }
}