fix(web): use Cotacol for climb difficulty

4 files changed, 25 insertions, 20 deletions

diff --git a/web/frontend/ride-detail-canvas.ts b/web/frontend/ride-detail-canvas.ts
index 1453013..c61afee 100644
--- a/web/frontend/ride-detail-canvas.ts
+++ b/web/frontend/ride-detail-canvas.ts
@@ -1,4 +1,4 @@
-import { clamp, climbMetrics, formatDistance, formatElevation, nearestPointIndex } from "./ride-detail-logic.js";
+import { clamp, climbMetrics, formatClimbLabel, formatDistance, formatElevation, nearestPointIndex } from "./ride-detail-logic.js";
 import type { BoundarySource, ClimbBounds, RideDetailColors, RideProfile, RideProfilePoint } from "./types.js";
 
 interface Plot {
@@ -137,7 +137,7 @@ export class RideProfileCanvas {
       const endX = clamp(this.xForDistance(metrics.end.distanceKm), plot.left, plot.right);
       this.context.fillStyle = climbIndex === this.focusedClimbIndex ? this.colors.climbFocusFill : this.colors.accentFill;
       this.context.fillRect(startX, plot.top, Math.max(endX - startX, 1), plot.bottom - plot.top);
-      const label = climb.name || `${metrics.category} ${Math.round(metrics.score)}`;
+      const label = formatClimbLabel(climb.name, metrics.category, metrics.cotacol);
       this.context.fillStyle = this.colors.climbLabel;
       this.context.textAlign = "center";
       this.context.textBaseline = "top";
diff --git a/web/frontend/ride-detail-logic.test.ts b/web/frontend/ride-detail-logic.test.ts
index 024f018..b848f7e 100644
--- a/web/frontend/ride-detail-logic.test.ts
+++ b/web/frontend/ride-detail-logic.test.ts
@@ -1,10 +1,11 @@
 import test from "node:test";
 import assert from "node:assert/strict";
 import {
-  categoryForScore,
+  categoryForCotacol,
   climbMetrics,
   cotacolForClimb,
   elevationAtDistance,
+  formatClimbLabel,
   formatDistance,
   formatElevation,
   nearestPointIndex,
@@ -28,7 +29,7 @@ test("interpolates elevation between route points", () => {
   assert.equal(elevationAtDistance(points, 2, 250), 120);
 });
 
-test("calculates climb metrics with the Cotacol score", () => {
+test("calculates climb metrics with Cotacol", () => {
   const metrics = climbMetrics(points, { startIndex: 0, endIndex: 3 });
   assert.ok(metrics);
 
@@ -36,7 +37,12 @@ test("calculates climb metrics with the Cotacol score", () => {
   assert.equal(metrics.elevationGain, 20);
   assert.equal(metrics.slope, 8);
   assert.equal(metrics.cotacol, cotacolForClimb(points, 0, 3));
-  assert.equal(metrics.category, categoryForScore(metrics.score));
+  assert.equal(metrics.category, categoryForCotacol(metrics.cotacol));
+});
+
+test("formats profile climb labels with Cotacol", () => {
+  assert.equal(formatClimbLabel("", "Cat 4", 45.9), "Cat 4 45.9");
+  assert.equal(formatClimbLabel("Col de Test", "Cat 4", 45.9), "Col de Test");
 });
 
 test("formats profile labels consistently", () => {
diff --git a/web/frontend/ride-detail-logic.ts b/web/frontend/ride-detail-logic.ts
index 825bb2c..a2ba80a 100644
--- a/web/frontend/ride-detail-logic.ts
+++ b/web/frontend/ride-detail-logic.ts
@@ -19,15 +19,17 @@ export const nearestPointIndex = (points: ProfilePoint[], distance: number): num
   return distance - previous.distanceKm < points[low].distanceKm - distance ? low - 1 : low;
 };
 
-export const categoryForScore = (score: number): string => {
-  if (score < 35) return "NO";
-  if (score < 80) return "Cat 4";
-  if (score < 180) return "Cat 3";
-  if (score < 250) return "Cat 2";
-  if (score < 600) return "Cat 1";
+export const categoryForCotacol = (cotacol: number): string => {
+  if (cotacol < 35) return "NO";
+  if (cotacol < 80) return "Cat 4";
+  if (cotacol < 180) return "Cat 3";
+  if (cotacol < 250) return "Cat 2";
+  if (cotacol < 600) return "Cat 1";
   return "HC";
 };
 
+export const formatClimbLabel = (name: string, category: string, cotacol: number): string => name || `${category} ${cotacol.toFixed(1)}`;
+
 export const elevationAtDistance = (points: ProfilePoint[], index: number, distanceM: number): number => {
   if (index + 1 >= points.length) return points[index].elevationM;
   const startDistanceM = points[index].distanceKm * 1000;
@@ -40,7 +42,7 @@ export const cotacolForClimb = (points: ProfilePoint[], startIndex: number, endI
   const startDistanceM = points[startIndex].distanceKm * 1000;
   const lastDistanceM = points[endIndex].distanceKm * 1000;
   if (lastDistanceM <= startDistanceM) return 0;
-  let score = 0;
+  let cotacol = 0;
   let pointIndex = startIndex;
   for (let segmentStartM = startDistanceM; segmentStartM < lastDistanceM; segmentStartM += 100) {
     const segmentEndM = Math.min(segmentStartM + 100, lastDistanceM);
@@ -49,9 +51,9 @@ export const cotacolForClimb = (points: ProfilePoint[], startIndex: number, endI
     while (pointIndex < endIndex && points[pointIndex + 1].distanceKm * 1000 < segmentEndM) pointIndex++;
     const endElevation = elevationAtDistance(points, pointIndex, segmentEndM);
     const slope = (endElevation - startElevation) / (segmentEndM - segmentStartM);
-    if (slope > 0) score += ((segmentEndM - segmentStartM) / 1000) * (slope * 100) ** 2;
+    if (slope > 0) cotacol += ((segmentEndM - segmentStartM) / 1000) * (slope * 100) ** 2;
   }
-  return score;
+  return cotacol;
 };
 
 export const climbMetrics = (points: ProfilePoint[], bounds: ClimbBounds | undefined): ClimbMetrics | null => {
@@ -70,15 +72,14 @@ export const climbMetrics = (points: ProfilePoint[], bounds: ClimbBounds | undef
   const distanceKm = end.distanceKm - start.distanceKm;
   const elevationGain = end.elevationM - start.elevationM;
   const slope = distanceKm > 0 ? elevationGain / (distanceKm * 10) : 0;
-  const score = distanceKm > 0 ? ((Math.abs(elevationGain) * elevationGain) / (distanceKm * 1000)) * 10 : 0;
+  const cotacol = cotacolForClimb(points, bounds.startIndex, bounds.endIndex);
   return {
     start,
     end,
     distanceKm,
     elevationGain,
     slope,
-    score,
-    cotacol: cotacolForClimb(points, bounds.startIndex, bounds.endIndex),
-    category: categoryForScore(score),
+    cotacol,
+    category: categoryForCotacol(cotacol),
   };
 };
diff --git a/web/frontend/types.d.ts b/web/frontend/types.d.ts
index 66f1ad2..3642971 100644
--- a/web/frontend/types.d.ts
+++ b/web/frontend/types.d.ts
@@ -18,7 +18,6 @@ export interface RideProfileClimb {
   topKm: number;
   topElevationM: number;
   name: string;
-  score: number;
   category: string;
   distanceKm: number;
   slopePercent: number;
@@ -69,7 +68,6 @@ export interface ClimbMetrics {
   distanceKm: number;
   elevationGain: number;
   slope: number;
-  score: number;
   cotacol: number;
   category: string;
 }