1 files changed, 30 insertions, 0 deletions
diff --git a/web/frontend/climb-attempts-logic.ts b/web/frontend/climb-attempts-logic.ts
new file mode 100644
index 0000000..868545b
--- /dev/null
+++ b/web/frontend/climb-attempts-logic.ts
@@ -0,0 +1,30 @@
+import type { ClimbAttemptPoint } from "./types.js";
+
+// formatAttemptDuration renders an attempt duration as "mm:ss", or "h:mm:ss" past an hour.
+export const formatAttemptDuration = (durationS: number): string => {
+  const total = Math.max(0, Math.round(durationS));
+  const seconds = total % 60;
+  const minutes = Math.floor(total / 60) % 60;
+  const hours = Math.floor(total / 3600);
+  const two = (value: number): string => String(value).padStart(2, "0");
+  return hours > 0 ? `${hours}:${two(minutes)}:${two(seconds)}` : `${minutes}:${two(seconds)}`;
+};
+
+// formatPower renders an average power in whole watts.
+export const formatPower = (powerW: number): string => `${Math.round(powerW)} W`;
+
+export interface AttemptsDomain {
+  maxDurationS: number;
+  maxPowerW: number;
+}
+
+// attemptsDomain returns zero-based axis bounds padded above the data; empty or degenerate data still yields a drawable unit domain.
+export const attemptsDomain = (points: ClimbAttemptPoint[]): AttemptsDomain => {
+  let maxDurationS = 0;
+  let maxPowerW = 0;
+  for (const point of points) {
+    maxDurationS = Math.max(maxDurationS, point.durationS);
+    maxPowerW = Math.max(maxPowerW, point.averagePowerW);
+  }
+  return { maxDurationS: maxDurationS * 1.08 || 1, maxPowerW: maxPowerW * 1.08 || 1 };
+};