can't get second part done

solutions/02.ts

@@ -35,7 +35,47 @@ class DayTwo implements Solvable {
 
         return this
     }
+
     public part2(): DayTwo {
+        const reports = this.input.trim().split("\n").map(line => line.split(' ').map(level => Number.parseInt(level)))
+        const slidingWindow = (levels: number[]): boolean => { 
+            const gradients: ("ascending" | "descending" | "stagnating")[] = []
+            const diffs: number[] = []
+            let [i,j] = [0,1]
+            while (j < levels.length) {
+                // is unsafe if ascent / descend bigger than 3 or smaller than 1
+                const diff = Math.abs(levels[i] - levels[j])
+                diffs.push(diff)
+                // calculate positive or negative gradient
+                if (levels[i] < levels[j]) {
+                    gradients.push("ascending") 
+                } else if (levels[i] > levels[j]) {
+                    gradients.push("descending")
+                } else {
+                    gradients.push("stagnating")
+                }
+                i++
+                j++
+            }
+
+            // amount of unsafe diffs
+            const unsafeDiffs = diffs.filter((diff) => diff > 3 || diff < 1).length
+
+            // how many gradients are ascending / descending?
+            const ascendingAmount = gradients.filter((gradient) => gradient === "ascending").length
+            const descendingAmount = gradients.filter((gradient) => gradient === "descending").length
+
+            // accept one unsafe diff if all gradients either ascending or descending
+            if (ascendingAmount === gradients.length || descendingAmount === gradients.length && unsafeDiffs === 1) return true
+
+            // allow for a single wrong gradient
+            const ascendingExceptOne = ascendingAmount >= gradients.length - 1
+            const descendingExceptOne = descendingAmount >= gradients.length - 1
+            return ascendingExceptOne || descendingExceptOne
+        }
+        const result = reports.map(levels => slidingWindow(levels)).filter(level_safe => level_safe === true).length
+        console.log(result)
+
         return this
     }
 }