const fsPromises = require('fs').promises;

function getLimits(array) {
    let xmax = 0;
    let xmin = 0;
    let ymax = 0;
    let ymin = 0;

    let x = 0;
    let y = 0;

    array.forEach(elem => {
        let direction = elem[0];
        let distance = parseInt(elem.substr(1), 10);
        let xdifference = 0;
        let ydifference = 0;
        switch(direction) {
            case "R":
                xdifference += distance;
                x += xdifference;
                xmax = Math.max(x, xmax);
                xdifference += distance;
                break;
            case "L":
                xdifference -= distance;
                x -= xdifference;
                xmin = Math.min(x, xmin);
                break;
            case "U":
                ydifference += distance;
                y += ydifference;
                ymax = Math.max(y, ymax);
            case "D":
                ydifference -= distance;
                y -= ydifference;
                ymin = Math.min(y, ymin);
        }
    })
    return {
        xmax, xmin, ymax, ymin
    };
}

function combineLimits(limits1, limits2) {
    return {
        xmax: Math.max(limits1.xmax, limits2.xmax),
        xmin: Math.min(limits1.xmin, limits2.xmin),
        ymax: Math.max(limits1.ymax, limits2.ymax),
        ymin: Math.min(limits1.ymin, limits2.ymin)
    }
}

function drawMap(limits) {
    let map = [];
    let ylength = Math.abs(limits.ymin - limits.ymax - 1);
    let xlength = Math.abs(limits.xmin - limits.xmax - 1);
    let xline = [];
    for (i = 0; i < xlength; i++) {
        xline.push('0');
    }
    for (i = 0; i < ylength; i++) {
        map.push(xline.slice(0));
    }
    map[limits.ymax][limits.xmin] = 'W';
    for (i = 0; i < map.length; i++) {
        console.log(map[i].join(''))
    }
    return map;
}

fsPromises.readFile('/Users/Elture/Desktop/projects/puzzles/puzzle4input.txt', 'utf-8')
.then((string) => {
    let firstCable = string.split('\r\n')[0].split(',');
    let secondCable = string.split('\r\n')[1].split(',');
    let limitsFirst = getLimits(firstCable);
    let limitsSecond = getLimits(secondCable);
    let fullLimits = combineLimits(limitsFirst, limitsSecond);
    drawMap(fullLimits)
})