Begin work on day 15 pt 1

15/15_1.js

@@ -0,0 +1,145 @@
+const fs = require("node:fs");
+const Computer = require("../IntComp/Computer");
+
+/* Set up the computer */
+const input = fs.readFileSync("./15/input.dat", "utf8")
+    .split(",")
+    .map((x) => parseInt(x, 10));
+
+const droid = new Computer(input);
+
+/* Set up values for the simulation */
+/**
+ * Directions the droid can move in
+ */
+const Directions = {
+    NORTH: 1,
+    SOUTH: 2,
+    EAST: 3,
+    WEST: 4,
+};
+/**
+ * Vectorized values for the Directions values
+ */
+const Vectors = {
+    NORTH: 1,
+    SOUTH: -1,
+    EAST: 1,
+    WEST: -1,
+};
+/**
+ * Tile data for rendering the droid's internal map
+ */
+const mapTiles = {
+    WALL: "█",
+    EMPTY: ".",
+    OXYGEN: "0",
+};
+/**
+ * The current position of the droid
+ * 
+ * X and Y are relative to the droid's position at the start of the
+ * simulation.
+ */
+const droidPosition = {
+    x: 0,
+    y: 0
+};
+
+const droidMap = new Map();
+
+/**
+ * Statuses output but the droid
+ */
+const STATUS = ["NO_MOVEMENT", "MOVEMENT_SUCCESSFUL", "OXYGEN_FOUND"];
+
+/**
+ * The last direction we had the droid move in
+ */
+let lastDirection = Directions.EAST;
+/**
+ * The last status code output by the droid
+ */
+let lastSignal = -1;
+
+let mapLooped = false;
+
+// Start the droid
+droid.Run()
+// Continue running of droid
+do {
+    // Handle input to the droid
+    if (droid.awaitingInput) {
+        // Get the new direction to move in
+        let currDirection = updateMap(lastDirection, lastSignal);
+
+        droid.Input(currDirection);
+        lastDirection = currDirection;
+    }
+    // Handle the droid's output
+    if (droid.HasOutput()) {
+        lastSignal = droid.outputValues.pop()
+        console.log(STATUS[lastSignal]);
+    }
+} while (droid.running && !mapLooped);
+
+/**
+ * Update the map data and return a new dirction to move in
+ *
+ * @param {1|2|3|4} lastDirection The last direction the droid moved in
+ * @param {0|1|2} lastSignal The last signal output by the droid
+ *
+ * @returns {1|2|3|4} A new direction for the droid to move in
+ */
+function updateMap(lastDirection, lastSignal) {
+    let newDirection = lastDirection;
+    let mapX = droidPosition.x;
+    let mapY = droidPosition.y;
+    let foundTile = mapTiles.EMPTY;
+
+    if (lastSignal == 0) {
+        if (lastDirection == Directions.EAST) {
+            mapX += Vectors.EAST;
+            newDirection = Directions.NORTH;
+        }
+        else if (lastDirection == Directions.NORTH) {
+            mapY += Vectors.NORTH;
+            newDirection = Directions.WEST;
+        }
+        else if (lastDirection == Directions.WEST) {
+            mapX += Vectors.WEST;
+            newDirection = Directions.SOUTH;
+        }
+        else if (lastDirection == Directions.SOUTH) {
+            mapY += Vectors.SOUTH;
+            newDirection = Directions.EAST;
+        }
+
+        foundTile = mapTiles.WALL;
+    }
+    else if (lastSignal == 1) {
+        if (lastDirection == Directions.EAST) {
+            droidPosition.x += Vectors.EAST;
+        }
+        else if (lastDirection == Directions.NORTH) {
+            droidPosition.y += Vectors.NORTH;
+        }
+        else if (lastDirection == Directions.WEST) {
+            droidPosition.x += Vectors.WEST;
+        }
+        else if (lastDirection == Directions.SOUTH) {
+            droidPosition.y += Vectors.SOUTH;
+        }
+        foundTile = mapTiles.EMPTY;
+    }
+    else if (lastSignal == 2) {
+        foundTile = mapTiles.OXYGEN;
+        console.log(STATUS[lastSignal]);
+    }
+
+    mapLooped = droidMap.has(`${mapX},${mapY}`) && mapX + mapY != 0;
+
+    droidMap.set(`${mapX},${mapY}`, foundTile);
+
+    return newDirection;
+}