day 6 part 1 init

solutions/06.ts

@@ -4,60 +4,93 @@ import { solvables } from "../main.ts";
 import type { Solvable } from "../solvable.ts";
 import { readInput } from "../utils.ts";
 
-type Direction = "up" | "down" | "left" | "right"
+type Direction = "up" | "right" | "down" | "left"
 
 class DaySix implements Solvable {
     input: string[][] = readInput('06').split('\n').map(col => col.split(''))
     map = this.input
-    visitedLoc = new Map()
+    visitedLoc: Map<[number, number], null> = new Map()
 
     // assigned in part1
     startingPosition: [number, number] = [0, 0]
 
-    takeStep = (x: number, y: number, direction: Direction): [number, number] => {
+    turnRight = (direction: Direction): Direction => {
         switch (direction) {
             case 'up':
-                return [x, y + 1]
-            case 'down':
-                return [x, y - 1]
+                return 'right'
             case 'right':
-                return [x + 1, y]
+                return 'down'
+            case 'down':
+                return 'left'
             case 'left':
-                return [x + 1, y]
+                return 'up'
         }
     }
 
+    lookAhead = (x: number, y: number, direction: Direction): [number, number] => {
+        switch (direction) {
+            case 'up':
+                return [x, y - 1]
+            case 'down':
+                return [x, y + 1]
+            case 'right':
+                return [x + 1, y]
+            case 'left':
+                return [x - 1, y]
+        }
+    }
+
+    // returns true if out of bounds
     walk = (x: number, y: number, direction: Direction): [boolean, number, number, Direction] => {
         const nextStepInBounds = {
             up: y > 1,
             down: y < this.map.length,
             left: x > 1,
-            right: x < this.map.length,
+            right: x < this.map[0].length,
         }
 
+        // if oob, return true
         if (!nextStepInBounds[direction]) {
+            console.log('went oob')
             return [true, x, y, direction]
         } else {
-            // TODO check for obstacles
-            const [newX, newY] = this.takeStep(x, y, direction)
-            return [false, newX, newY, direction]
+            console.log(y, x, direction)
+            // if obstacle ahead, return false and current location
+            const [nextX, nextY] = this.lookAhead(x, y, direction)
+            if (this.map[nextY][nextX] === '#') {
+                return [false, x, y, this.turnRight(direction)]
+            }
+            // if no obstacle ahead, return false and new location
+            return [false, nextX, nextY, direction]
         }
     }
 
+    // path [y, x][]
+    visualizePath = (path: [number, number][]): string => {
+        const [height, width] = [this.map.length, this.map[0].length]
+        const screenMat: string[][] = new Array(width).fill(new Array(height).fill('.'))
+        for (const [y, x] of path) screenMat[y][x] = 'X'
+        const screen: string = screenMat.map((line: string[]) => line.join('')).join('\n')
+        return screen
+    }
+
     public part1(): Solvable {
         // find starting position
-        this.input.forEach((line, y) => line.forEach((col, x) => { if (col === '^') this.startingPosition = [y, x] }))
+        this.input.forEach((line, y) => line.forEach((char, x) => { if (char === '^') this.startingPosition = [y, x] }))
         let [x, y] = [this.startingPosition[0], this.startingPosition[1]]
         let direction: Direction = 'up'
         let outOfBounds = false
 
         while (!outOfBounds) {
             [outOfBounds, x, y, direction] = this.walk(x, y, direction)
+            this.visitedLoc.set([y, x], null)
         }
 
-
-
-        console.log()
+        const path = this.visitedLoc.keys().toArray()
+        const result: number = path.length
+        console.log(this.visualizePath(path))
+        console.log(path)
+        console.log(result)
 
         return this
     }