STFC Battle Journal Parse code

battle.js

import fs from "fs";

const battleJson = JSON.parse(fs.readFileSync("battle.json"));

let readingAbilitiesApply = false;
let readingFTs = false;
let readingAttack = false;

let idx = 0;

while (idx < battleJson.length) {
    const entry = battleJson[idx];
    var skip = false;
    switch (entry) {
        case -96:
            console.log("Round Start");
            break;
        case -90:
            console.log("Sub round start");
            break;
        case -88:
            console.log("Officer abilities apply start");
            readingAbilitiesApply = true;
            break;
        case -86:
            console.log("Officer ability apply start");
            idx++;
            var OfficerId = battleJson[idx];
            idx++;
            var AbilityId = battleJson[idx];
            idx++;
            var value = battleJson[idx];
            break;
        case -85:
            console.log("Officer ability apply end");
            break;
        case -87:
            console.log("Officer abilities apply end");
            readingAbilitiesApply = false;
            break;
        case -84:
            console.log("Forbidden techs apply start");
            readingFTs = true;
            break;
        case -82:
            console.log("Ft apply start");
            idx++;
            var FtId = battleJson[idx];
            idx++;
            var AbilityId = battleJson[idx];
            idx++;
            var value = battleJson[idx];
            break;
        case -81:
            console.log("Ft apply end");
            break;
        case -83:
            console.log("Forbidden techs apply end");
            readingFTs = false;
            break;
        case -98:
            console.log("Start attack");
            readingAttack = true;
            break;
        case -95:
            console.log("Charging");
            idx++;
            var charge = battleJson[idx];
            break;
        case -99:
            console.log("End attack");
            readingAttack = false;
            break;
        case -89:
            console.log("Sub round end");
            break;
        case -97:
            console.log("Round End");
            break;
        default:
            if (readingAbilitiesApply) {
                var OfficerAbilityAppliedShipId = entry;
            } else if (readingFTs) {
                idx++;
                var ftShipId = battleJson[idx];
            } else if (readingAttack) {
                var weaponId = entry;
                idx++;
                var targetShip = battleJson[idx];
                if (targetShip == -95) {
                    idx++;
                    var charge = battleJson[idx];
                } else {
                    idx++;
                    var accuracy = battleJson[idx];
                    idx++;
                    var dodge = battleJson[idx];
                    idx++;
                    var missed = battleJson[idx];
                    idx++;
                    var crit = battleJson[idx];
                    idx++;
                    var hpdamage = battleJson[idx];
                    idx++;
                    var remainingHp = battleJson[idx];
                    idx++;
                    var shieldDamage = battleJson[idx];
                    idx++;
                    var remainingShield = battleJson[idx];
                    idx++;
                    var mitigatedDamage = battleJson[idx];
                    idx++;
                    var isoDamage = battleJson[idx];
                    idx++;
                    var isoMitigated = battleJson[idx];
                }
            } else {
                var attackingShip = entry;
            }
            break;
    }
    if (!skip) {
        idx++;
    }
}