feat(web): improve ride detail climb profiles

1 files changed, 180 insertions, 11 deletions

diff --git a/web/static/ride-detail.js b/web/static/ride-detail.js
index bd36da4..fc9c123 100644
--- a/web/static/ride-detail.js
+++ b/web/static/ride-detail.js
@@ -26,6 +26,12 @@
     hoverLine: resolveColor("--color-hover-line"),
     climbRoute: resolveColor("--color-climb-route"),
     climbFocusFill: resolveColor("--color-climb-focus-fill"),
+    profileDownhill: resolveColor("--color-profile-downhill"),
+    profile0To3: resolveColor("--color-profile-0-3"),
+    profile3To6: resolveColor("--color-profile-3-6"),
+    profile6To9: resolveColor("--color-profile-6-9"),
+    profile9To12: resolveColor("--color-profile-9-12"),
+    profile12Plus: resolveColor("--color-profile-12-plus"),
   };
   colorProbe.remove();
   const route = JSON.parse(routeElement.textContent);
@@ -47,6 +53,8 @@
   const points = profile.points || [];
   if (points.length === 0) return;
   const climbItems = [...document.querySelectorAll("[data-climb-item]")];
+  const climbItemIndices = climbItems.map((item) => Number.parseInt(item.dataset.climbIndex, 10));
+  const officialProfileCanvases = [...document.querySelectorAll("[data-official-profile]")];
   const previousClimbButton = document.querySelector("[data-climb-previous]");
   const nextClimbButton = document.querySelector("[data-climb-next]");
   const climbPosition = document.querySelector("[data-climb-position]");
@@ -73,7 +81,8 @@
   if (!context) return;
   const state = {
     hoveredIndex: -1,
-    focusedClimbIndex: 0,
+    focusedClimbItemIndex: 0,
+    focusedClimbIndex: climbItemIndices[0] ?? 0,
     climbBounds: (profile.climbs || []).map((climb) => ({ startIndex: climb.startIndex, endIndex: climb.endIndex })),
     plot: null,
     width: 0,
@@ -94,6 +103,157 @@
   const formatDistance = (distance) => `${distance.toFixed(distance < 10 ? 1 : 0)} km`;
   const formatElevation = (elevation) => `${Math.round(elevation)} m`;
   const clamp = (value, min, max) => Math.max(min, Math.min(max, value));
+  const profileStepSizesM = [100, 200, 500, 1000];
+  const displayStepForLength = (lengthM) => profileStepSizesM.find((stepM) => Math.ceil(lengthM / stepM) <= 30) || profileStepSizesM[profileStepSizesM.length - 1];
+  const profileBandForSlope = (slopePercent) => {
+    if (slopePercent < 0) return colors.profileDownhill;
+    if (slopePercent < 3) return colors.profile0To3;
+    if (slopePercent < 6) return colors.profile3To6;
+    if (slopePercent < 9) return colors.profile6To9;
+    if (slopePercent < 12) return colors.profile9To12;
+    return colors.profile12Plus;
+  };
+  const officialProfileSections = (startIndex, endIndex, stepM) => {
+    const startDistanceM = points[startIndex].distanceKm * 1000;
+    const endDistanceM = points[endIndex].distanceKm * 1000;
+    const sections = [];
+    let pointIndex = startIndex;
+    const elevationAtDistance = (distanceM) => {
+      while (pointIndex < endIndex - 1 && points[pointIndex + 1].distanceKm * 1000 < distanceM) pointIndex++;
+      const nextIndex = Math.min(pointIndex + 1, endIndex);
+      const first = points[pointIndex];
+      const next = points[nextIndex];
+      const distanceSpan = next.distanceKm * 1000 - first.distanceKm * 1000;
+      if (distanceSpan <= 0) return first.elevationM;
+      const fraction = (distanceM - first.distanceKm * 1000) / distanceSpan;
+      return first.elevationM + clamp(fraction, 0, 1) * (next.elevationM - first.elevationM);
+    };
+    for (let sectionStartM = startDistanceM; sectionStartM < endDistanceM; sectionStartM += stepM) {
+      const sectionEndM = Math.min(sectionStartM + stepM, endDistanceM);
+      const startElevation = elevationAtDistance(sectionStartM);
+      const endElevation = elevationAtDistance(sectionEndM);
+      const slopePercent = (endElevation - startElevation) / (sectionEndM - sectionStartM) * 100;
+      sections.push({
+        startDistanceKm: sectionStartM / 1000,
+        endDistanceKm: sectionEndM / 1000,
+        startElevation,
+        endElevation,
+        slopePercent,
+        color: profileBandForSlope(slopePercent),
+      });
+    }
+    return sections;
+  };
+  const drawOfficialProfile = (profileCanvas) => {
+    const startIndex = Number.parseInt(profileCanvas.dataset.profileStart, 10);
+    const endIndex = Number.parseInt(profileCanvas.dataset.profileEnd, 10);
+    if (!Number.isInteger(startIndex) || !Number.isInteger(endIndex) || startIndex < 0 || endIndex >= points.length || startIndex >= endIndex) return;
+    const rect = profileCanvas.getBoundingClientRect();
+    if (rect.width === 0 || rect.height === 0) return;
+    const context = profileCanvas.getContext("2d");
+    if (!context) return;
+    const ratio = window.devicePixelRatio || 1;
+    profileCanvas.width = Math.floor(rect.width * ratio);
+    profileCanvas.height = Math.floor(rect.height * ratio);
+    context.setTransform(ratio, 0, 0, ratio, 0, 0);
+    const plot = { left: 10, right: rect.width - 10, top: 16, bottom: rect.height - 24 };
+    const climbLengthM = (points[endIndex].distanceKm - points[startIndex].distanceKm) * 1000;
+    const sections = officialProfileSections(startIndex, endIndex, displayStepForLength(climbLengthM));
+    if (sections.length === 0) return;
+    let minElevation = sections[0].startElevation;
+    let maxElevation = minElevation;
+    for (const section of sections) {
+      minElevation = Math.min(minElevation, section.startElevation, section.endElevation);
+      maxElevation = Math.max(maxElevation, section.startElevation, section.endElevation);
+    }
+    const elevationPadding = Math.max((maxElevation - minElevation) * 0.12, 8);
+    minElevation -= elevationPadding;
+    maxElevation += elevationPadding;
+    const minDistance = sections[0].startDistanceKm;
+    const maxDistance = sections[sections.length - 1].endDistanceKm;
+    const distanceSpan = Math.max(maxDistance - minDistance, 0.1);
+    const elevationSpan = Math.max(maxElevation - minElevation, 1);
+    const xForDistance = (distanceKm) => plot.left + (distanceKm - minDistance) / distanceSpan * (plot.right - plot.left);
+    const yForElevation = (elevationM) => plot.bottom - (elevationM - minElevation) / elevationSpan * (plot.bottom - plot.top);
+    context.clearRect(0, 0, rect.width, rect.height);
+    context.fillStyle = colors.plotSurface;
+    context.fillRect(0, 0, rect.width, rect.height);
+    context.strokeStyle = colors.grid;
+    context.lineWidth = 1;
+    context.beginPath();
+    context.moveTo(plot.left, plot.bottom);
+    context.lineTo(plot.right, plot.bottom);
+    context.stroke();
+    for (const section of sections) {
+      const startX = xForDistance(section.startDistanceKm);
+      const endX = xForDistance(section.endDistanceKm);
+      context.beginPath();
+      context.moveTo(startX, plot.bottom);
+      context.lineTo(startX, yForElevation(section.startElevation));
+      context.lineTo(endX, yForElevation(section.endElevation));
+      context.lineTo(endX, plot.bottom);
+      context.closePath();
+      context.globalAlpha = 0.25;
+      context.fillStyle = section.color;
+      context.fill();
+      context.globalAlpha = 1;
+      context.beginPath();
+      context.moveTo(startX, yForElevation(section.startElevation));
+      context.lineTo(endX, yForElevation(section.endElevation));
+      context.strokeStyle = section.color;
+      context.lineWidth = 2.5;
+      context.stroke();
+    }
+    context.font = "9px system-ui, sans-serif";
+    context.fillStyle = colors.subtle;
+    context.textBaseline = "bottom";
+    context.textAlign = "center";
+    context.save();
+    context.beginPath();
+    context.rect(plot.left, plot.top, plot.right - plot.left, plot.bottom - plot.top);
+    context.clip();
+    for (const section of sections) {
+      const startX = xForDistance(section.startDistanceKm);
+      const endX = xForDistance(section.endDistanceKm);
+      const label = `${section.slopePercent.toFixed(1)}%`;
+      const labelY = Math.max(plot.top + 10, Math.min(yForElevation(section.startElevation), yForElevation(section.endElevation)) - 4);
+      context.fillText(label, (startX + endX) / 2, labelY);
+    }
+    context.restore();
+    let topElevation = sections[0].startElevation;
+    let topDistance = sections[0].startDistanceKm;
+    for (const section of sections) {
+      if (section.startElevation > topElevation) {
+        topElevation = section.startElevation;
+        topDistance = section.startDistanceKm;
+      }
+      if (section.endElevation > topElevation) {
+        topElevation = section.endElevation;
+        topDistance = section.endDistanceKm;
+      }
+    }
+    context.fillStyle = colors.accent;
+    context.beginPath();
+    context.arc(xForDistance(topDistance), yForElevation(topElevation), 3.5, 0, 2 * Math.PI);
+    context.fill();
+    context.font = "11px system-ui, sans-serif";
+    context.fillStyle = colors.subtle;
+    context.textBaseline = "top";
+    context.textAlign = "left";
+    context.fillText(formatDistance(0), plot.left, rect.height - 16);
+    context.textAlign = "right";
+    context.fillText(formatDistance(maxDistance - minDistance), plot.right, rect.height - 16);
+  };
+  for (const card of document.querySelectorAll("[data-official-climb-card]")) {
+    card.addEventListener("toggle", () => {
+      if (!card.open) return;
+      for (const other of document.querySelectorAll("[data-official-climb-card]")) {
+        if (other !== card) other.open = false;
+      }
+      const profileCanvas = card.querySelector("[data-official-profile]");
+      if (profileCanvas) drawOfficialProfile(profileCanvas);
+    });
+  }
   const xForDistance = (distance) => {
     const span = Math.max(maxDistance - minDistance, 1);
     return state.plot.left + (distance - minDistance) / span * (state.plot.right - state.plot.left);
@@ -383,24 +543,27 @@
   };
   const updateClimbFocus = (index, zoom) => {
     if (climbItems.length === 0) return;
-    state.focusedClimbIndex = clamp(index, 0, climbItems.length - 1);
+    state.focusedClimbItemIndex = clamp(index, 0, climbItems.length - 1);
+    state.focusedClimbIndex = climbItemIndices[state.focusedClimbItemIndex];
     for (let itemIndex = 0; itemIndex < climbItems.length; itemIndex++) {
-      const active = itemIndex === state.focusedClimbIndex;
+      const active = itemIndex === state.focusedClimbItemIndex;
       climbItems[itemIndex].hidden = !active;
       climbItems[itemIndex].setAttribute("aria-hidden", String(!active));
-      if (climbLayers[itemIndex]) {
-        updateClimbLayer(itemIndex);
+      climbItems[itemIndex].classList.toggle("focused", active);
+      const climbIndex = climbItemIndices[itemIndex];
+      if (climbLayers[climbIndex]) {
+        updateClimbLayer(climbIndex);
       }
     }
-    if (climbPosition) climbPosition.textContent = `Climb ${state.focusedClimbIndex + 1} of ${climbItems.length}`;
-    if (previousClimbButton) previousClimbButton.disabled = state.focusedClimbIndex === 0;
-    if (nextClimbButton) nextClimbButton.disabled = state.focusedClimbIndex === climbItems.length - 1;
+    if (climbPosition) climbPosition.textContent = `Climb ${state.focusedClimbItemIndex + 1} of ${climbItems.length}`;
+    if (previousClimbButton) previousClimbButton.disabled = state.focusedClimbItemIndex === 0;
+    if (nextClimbButton) nextClimbButton.disabled = state.focusedClimbItemIndex === climbItems.length - 1;
     clearBoundarySelection();
     draw();
     if (zoom) zoomToClimb(state.focusedClimbIndex);
   };
-  if (previousClimbButton) previousClimbButton.addEventListener("click", () => updateClimbFocus(state.focusedClimbIndex - 1, true));
-  if (nextClimbButton) nextClimbButton.addEventListener("click", () => updateClimbFocus(state.focusedClimbIndex + 1, true));
+  if (previousClimbButton) previousClimbButton.addEventListener("click", () => updateClimbFocus(state.focusedClimbItemIndex - 1, true));
+  if (nextClimbButton) nextClimbButton.addEventListener("click", () => updateClimbFocus(state.focusedClimbItemIndex + 1, true));
   canvas.addEventListener("pointermove", (event) => {
     if (!state.plot) return;
     const rect = canvas.getBoundingClientRect();
@@ -433,7 +596,13 @@
     const index = state.hoveredIndex < 0 ? (direction > 0 ? 0 : points.length - 1) : state.hoveredIndex + direction;
     showPoint(index);
   });
-  window.addEventListener("resize", draw);
+  window.addEventListener("resize", () => {
+    draw();
+    for (const profileCanvas of officialProfileCanvases) {
+      const card = profileCanvas.closest("[data-official-climb-card]");
+      if (card?.open) drawOfficialProfile(profileCanvas);
+    }
+  });
   if (climbItems.length > 0) updateClimbFocus(0, false);
   else draw();
 })();