EXAM-04.Airport

function solve(dataRows) {
    let airport = new Set();
    let townStatistics = new Map();
    let townPlanes = new Map();

    for(let dataRow of dataRows) {
        let [planeId, town, passengersCount, action]
            = dataRow.split(/\s+/g);
        passengersCount = Number(passengersCount);

        if(action === 'land'){
            if (airport.has(planeId)) {
                continue;
            } else {
                airport.add(planeId);
            }

            if(!townStatistics.has(town)){
                townStatistics.set(town, [0, 0]);
            }

            if(!townPlanes.has(town)){
                townPlanes.set(town, new Set());
            }

            townStatistics.get(town)[0] += passengersCount;
            townPlanes.get(town).add(planeId);
        } else {
            if(airport.has(planeId)){
                airport.delete(planeId);
            } else {
                continue;
            }

            if(!townStatistics.has(town)){
                townStatistics.set(town, [0, 0]);
            }

            if(!townPlanes.has(town)){
                townPlanes.set(town, new Set());
            }

            townStatistics.get(town)[1] += passengersCount;
            townPlanes.get(town).add(planeId);
        }
    }

    let sortedAirport = Array.from(airport.values())
        .sort((a, b) => a.localeCompare(b));
    console.log('Planes left:');
    for(let planeId of sortedAirport) {
        console.log(`- ${planeId}`);
    }
    let sortedTowns = [...townStatistics.entries()]
        .sort(sortTowns);
    for(let [town, statistics] of sortedTowns) {
        console.log(town);
        console.log(`Arrivals: ${statistics[0]}`);
        console.log(`Departures: ${statistics[1]}`);
        let sortedPlanes = [...townPlanes.get(town).values()]
            .sort((a, b) => a.localeCompare(b));
        console.log('Planes:');
        for(let planeId of sortedPlanes) {
            console.log(`-- ${planeId}`);
        }
    }

    function sortTowns(a, b) {
        let aArrivals = a[1][0];
        let bArrivals = b[1][0];
        let firstCriteria = bArrivals - aArrivals;

        if(firstCriteria !== 0){
            return firstCriteria;
        } else {
            return a[0].localeCompare(b[0]);
        }
    }
}

solve([ "Airbus Paris 356 land",
    "Airbus London 321 land",
    "Airbus Paris 213 depart",
    "Airbus Ljubljana 250 land"
]);