export async function solveTask1part1() {
    const decoder = new TextDecoder("utf-8");
    const inputData = await Deno.readFile('./1/input.txt');
    const input = decoder.decode(inputData);
    
    // console.log(input.substring(0,50) + '...');
    const lines = input.split('\n')
        .filter( l => l.trim() !== '');
    console.log('lines', lines.slice(0, 5));

    const lefts = lines.map( line => {
        const leftStr = line.substring(0, line.indexOf(' ')).trim();
        const left = parseInt(leftStr);
        return left
    }).sort();
    const rights = lines.map( line => {
        const rightStr = line.substring(line.indexOf(' ')).trim();
        const right = parseInt(rightStr);
        return right
    }).sort();
    console.log('lefts', lefts.slice(0, 5));
    console.log('rights', rights.slice(0, 5));

    const diffs = []
    for (let i = 0; i < lines.length; i++) {
        const left = lefts[i];
        const right = rights[i];
        diffs.push(Math.abs(right - left));
    }
    
    const diffSum = diffs
        .reduce( (p, c) => p + c, 0);
    console.log('diffSum', diffSum);
}

export async function solveTask1part2() {
    const decoder = new TextDecoder("utf-8");
    const inputData = await Deno.readFile('./1/input.txt');
    const input = decoder.decode(inputData);
    
    const lines = input.split('\n')
        .filter( l => l.trim() !== '');
    console.log('lines', lines.slice(0, 5));

    const lefts = lines.map( line => {
        const leftStr = line.substring(0, line.indexOf(' ')).trim();
        const left = parseInt(leftStr);
        return left
    }).sort();
    const rights = lines.map( line => {
        const rightStr = line.substring(line.indexOf(' ')).trim();
        const right = parseInt(rightStr);
        return right
    }).sort();
    console.log('lefts', lefts.slice(0, 5));
    console.log('rights', rights.slice(0, 5));

    const scores = []
    let iR = 0;
    for (let i = 0; i < lines.length; i++) {
        const left = lefts[i];
        let multiplyer = 0;
        while (rights[iR] < left) {
            iR++;
        }
        while (rights[iR] === left) {
            multiplyer++;
            iR++;
        }
        scores.push(left * multiplyer);
    }
    
    const scoreSum = scores
        .reduce( (p, c) => p + c, 0);
    console.log('scoreSum', scoreSum);
}