const fs = require("fs");
const filePath = "data.txt";
const BITS = 12;




fs.readFile(filePath,"utf-8", (err, data)=>{
    let binaryArray = data.split("\n");

   
    let numberList = KeepCommon(binaryArray, 0)

    for(let bit = 1; bit < BITS ; bit++ ){
       numberList = KeepCommon(numberList, bit);
    
    }
    let oxygen_generator_rating = numberList[0];



    let numberList2 = KeepLeastCommon(binaryArray, 0);

    for(let bit = 1; bit < BITS; bit++){
        numberList2 = KeepLeastCommon(numberList2, bit);
    }

    CO2_scrubber_rating = numberList2[0];

    console.log(`Oxygen number: ${oxygen_generator_rating}, CO2 Scubber rating: ${CO2_scrubber_rating }`);

     oxygen_generator_rating = parseInt(oxygen_generator_rating ,2);
     CO2_scrubber_rating = parseInt(CO2_scrubber_rating, 2);
    console.log(` Oxygen: ${oxygen_generator_rating},CO2: ${CO2_scrubber_rating}`);

    let result = oxygen_generator_rating*CO2_scrubber_rating;
    console.log(`Result ${result}`);

});

function KeepCommon(binaryArray, bit){
    let hasOnes = [];
    let hasZeros= [];
    for( let i = 0; i < binaryArray.length; i++){
      
        if ( binaryArray[i][bit] == '1'){
            hasOnes.push(binaryArray[i]);
        } else {
            hasZeros.push(binaryArray[i]);
        }
    }


    if( hasZeros.length > hasOnes.length){
        return hasZeros;
    }else{
       return hasOnes;
    }
}

function KeepLeastCommon(binaryArray, bit){
    if( binaryArray.length == 1 )
        return binaryArray;

    let hasOnes = [];
    let hasZeros= [];
    for( let i = 0; i < binaryArray.length; i++){
      
        if ( binaryArray[i][bit] == '1'){
            hasOnes.push(binaryArray[i]);
        } else {
            hasZeros.push(binaryArray[i]);
        }
    }


    if( hasZeros.length > hasOnes.length){
        return hasOnes;
    }else{
       return hasZeros;
    }
}