import path from 'path';
import { readFile, sum } from "../../utils";

let input = readFile(path.resolve(__dirname, 'input.txt'));

let grid: any[] = [];

let right = 0;
let up = 0;

let THistory: {x:number, y:number}[] = [];

let pos = {
   
    H: { x: 0, y: 0 },
    T: { x: 0, y: 0 }
}

input.split("\n").forEach(element => {
    const [dir, num] = element.split(" ");

    for (let n = 0; n < num; n++) {
        const prevH = {x: pos.H.x, y: pos.H.y}
        switch (dir) {
            case "U":
                pos.H = { x: pos.H.x, y: pos.H.y + 1 };
                break;
            case "D": 
                pos.H = { x: pos.H.x, y: pos.H.y - 1 };
                break;
            case "L":
                pos.H = { x: pos.H.x - 1, y: pos.H.y };
                break;
            case "R":
                pos.H = { x: pos.H.x + 1, y: pos.H.y };
                break;
        }

        const distX = Math.abs(pos.H.x - pos.T.x);
        const distY = Math.abs(pos.H.y - pos.T.y);
        if(distX > 1 || distY > 1) pos.T = {x: prevH.x, y: prevH.y};

        THistory.push(pos.T);
    }
}); 

console.log("Part 1:", new Set(THistory.map(pos => pos.x + "-" + pos.y)).size);