const fs = require("fs");
const dataPath = "data.txt";

function sum ( a, b, c) {
    return Number(a)+Number(b)+Number(c);
}

fs.readFile(dataPath, 'UTF-8',  (err, data)=>{
    const dataArray = data.split('\n');
    let sums = [];
    let increase_counter = 0;
    // group Data
    for ( let i = 0; i < dataArray.length-2; i++) {

        console.log(`(${i}) ${dataArray[i]} `);
        console.log(`(${i+1}) ${dataArray[i+1]}`);
        console.log(`(${i+2}) ${dataArray[i+2]}`);
        let value = sum(dataArray[i], dataArray[i+1], dataArray[i+2]);
        console.log(value);
        console.log("=== End group ===");
        sums.push(value);
       
    }


    console.log(`sums count: ${sums.length}`);

    // Count increases
    for( let i = 0; i < sums.length; i++){
        if( i > 0){
            let previous_index = i -1;
            
            console.log("(current) " + sums[i]);
            console.log(sums[previous_index]);
            console.log(`${sums[i]} > ${sums[previous_index]}`);

            if( Number(sums[i]) > Number(sums[previous_index]) ){
            console.log('Bigger!');
                increase_counter++;
            }
        }
    }

    console.log(`Increased: ${increase_counter}`);
    
});