feat: add interactive photo timeline

src/server/request-handler.ts

@@ -333,6 +333,11 @@ function htmlPage(): string {
         font-size: 0.82rem;
       }
 
+      .photo.active {
+        border-color: rgba(45, 108, 223, 0.42);
+        background: rgba(45, 108, 223, 0.12);
+      }
+
       .empty-state {
         padding: 14px;
         border-radius: 14px;
@@ -346,12 +351,26 @@ function htmlPage(): string {
         position: relative;
         min-height: 0;
         overflow: hidden;
+        display: grid;
+        grid-template-rows: minmax(460px, 1fr) auto;
+        gap: 16px;
+      }
+
+      .map-panel {
+        position: relative;
+        min-height: 0;
+        overflow: hidden;
+        border-radius: 20px;
+        border: 1px solid var(--border);
+        background: var(--panel);
+        backdrop-filter: blur(14px);
+        box-shadow: var(--shadow);
       }
 
       #map {
         width: 100%;
         height: 100%;
-        min-height: 560px;
+        min-height: 460px;
       }
 
       .map-label {
@@ -437,14 +456,166 @@ function htmlPage(): string {
         margin: 10px 12px;
       }
 
+      .timeline {
+        padding: 16px;
+        display: grid;
+        gap: 12px;
+      }
+
+      .timeline-header,
+      .timeline-footer {
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+        gap: 12px;
+      }
+
+      .timeline-header h2 {
+        margin: 0 0 4px;
+        font-size: 1rem;
+      }
+
+      .timeline-summary {
+        color: var(--muted);
+        font-size: 0.88rem;
+      }
+
+      .timeline-chart {
+        position: relative;
+        min-height: 170px;
+        padding: 14px 12px 10px;
+        border-radius: 16px;
+        border: 1px solid rgba(15, 23, 42, 0.08);
+        background: rgba(255, 255, 255, 0.55);
+        overflow: hidden;
+        touch-action: none;
+        user-select: none;
+      }
+
+      .timeline-bars {
+        height: 124px;
+        display: grid;
+        grid-auto-flow: column;
+        grid-auto-columns: minmax(10px, 1fr);
+        align-items: end;
+        gap: 3px;
+      }
+
+      .timeline-bar {
+        position: relative;
+        height: 100%;
+        display: grid;
+        align-items: end;
+        cursor: pointer;
+        border-radius: 8px 8px 4px 4px;
+      }
+
+      .timeline-bar-fill {
+        width: 100%;
+        border-radius: inherit;
+        min-height: 4px;
+        background: linear-gradient(180deg, rgba(45, 108, 223, 0.92), rgba(45, 108, 223, 0.36));
+        transition: transform 140ms ease, background 140ms ease, opacity 140ms ease;
+        transform-origin: bottom;
+      }
+
+      .timeline-bar:hover .timeline-bar-fill,
+      .timeline-bar.active .timeline-bar-fill {
+        background: linear-gradient(180deg, #f97316, #f59e0b);
+      }
+
+      .timeline-bar.selected .timeline-bar-fill {
+        background: linear-gradient(180deg, #16a34a, #86efac);
+      }
+
+      .timeline-bar.active .timeline-bar-fill {
+        box-shadow: 0 0 0 2px rgba(249, 115, 22, 0.18);
+      }
+
+      .timeline-bar.selected.active .timeline-bar-fill {
+        background: linear-gradient(180deg, #059669, #34d399);
+      }
+
+      .timeline-bar-meta {
+        position: absolute;
+        left: 50%;
+        bottom: -18px;
+        transform: translateX(-50%);
+        white-space: nowrap;
+        font-size: 0.72rem;
+        color: var(--muted);
+        pointer-events: none;
+      }
+
+      .timeline-axis {
+        position: relative;
+        height: 20px;
+        margin-top: -2px;
+      }
+
+      .timeline-axis-label {
+        position: absolute;
+        top: 0;
+        transform: translateX(-50%);
+        font-size: 0.72rem;
+        color: var(--muted);
+        white-space: nowrap;
+      }
+
+      .timeline-selection {
+        position: absolute;
+        top: 14px;
+        bottom: 34px;
+        border-radius: 10px;
+        border: 1px solid rgba(5, 150, 105, 0.45);
+        background: rgba(5, 150, 105, 0.16);
+        pointer-events: none;
+        opacity: 0;
+        transition: opacity 120ms ease;
+      }
+
+      .timeline-selection.visible {
+        opacity: 1;
+      }
+
+      .timeline-brush {
+        position: absolute;
+        top: 14px;
+        bottom: 34px;
+        border-radius: 10px;
+        border: 1px dashed rgba(45, 108, 223, 0.6);
+        background: rgba(45, 108, 223, 0.12);
+        pointer-events: none;
+        opacity: 0;
+      }
+
+      .timeline-brush.visible {
+        opacity: 1;
+      }
+
+      .timeline-footer {
+        font-size: 0.84rem;
+        color: var(--muted);
+      }
+
       @media (max-width: 920px) {
         .layout {
           grid-template-columns: 1fr;
         }
 
+        main {
+          grid-template-rows: minmax(400px, 1fr) auto;
+        }
+
         #map {
           min-height: 460px;
         }
+
+        .timeline-header,
+        .timeline-footer {
+          flex-direction: column;
+          align-items: flex-start;
+        }
       }
     </style>
   </head>
@@ -495,7 +666,7 @@ function htmlPage(): string {
             <span class="spinner" id="activity-spinner" aria-hidden="true"></span>
             <div class="status" id="share-status">Ready to load a share.</div>
           </div>
-          <div class="progress" aria-label="Ladefortschritt">
+          <div class="progress" aria-label="Loading progress">
             <div class="progress-bar" aria-hidden="true">
               <div class="progress-fill" id="progress-fill"></div>
             </div>
@@ -517,8 +688,29 @@ function htmlPage(): string {
       </aside>
 
       <main>
+        <section class="map-panel">
           <div class="map-label">Hover: thumbnail · click: fullscreen · route: time sorted</div>
           <div id="map"></div>
+        </section>
+        <section class="card timeline" aria-label="Photo timeline">
+          <div class="timeline-header">
+            <div>
+              <h2>Timeline</h2>
+              <div class="timeline-summary" id="timeline-summary">No photos loaded yet.</div>
+            </div>
+            <button class="secondary" id="timeline-clear" type="button" disabled>Clear range</button>
+          </div>
+          <div class="timeline-chart" id="timeline-chart">
+            <div class="timeline-bars" id="timeline-bars"></div>
+            <div class="timeline-selection" id="timeline-selection"></div>
+            <div class="timeline-brush" id="timeline-brush"></div>
+          </div>
+          <div class="timeline-axis" id="timeline-axis"></div>
+          <div class="timeline-footer">
+            <span id="timeline-range">All photos</span>
+            <span id="timeline-unit">Scale: day</span>
+          </div>
+        </section>
       </main>
     </div>
 
@@ -545,9 +737,18 @@ function htmlPage(): string {
 
       const state = {
         photos: [],
+        visiblePhotos: [],
         objectUrls: [],
         processed: 0,
-        total: 0
+        total: 0,
+        activePhotoId: null,
+        timelineSelection: null,
+        timeline: {
+          unit: "day",
+          bins: [],
+          start: null,
+          end: null
+        }
       };
       let activeImportController = null;
 
@@ -575,6 +776,15 @@ function htmlPage(): string {
       const progressText = mustGet("progress-text");
       const progressDetail = mustGet("progress-detail");
       const activitySpinner = mustGet("activity-spinner");
+      const timelineSummary = mustGet("timeline-summary");
+      const timelineClear = mustGet("timeline-clear");
+      const timelineChart = mustGet("timeline-chart");
+      const timelineBars = mustGet("timeline-bars");
+      const timelineSelection = mustGet("timeline-selection");
+      const timelineBrush = mustGet("timeline-brush");
+      const timelineAxis = mustGet("timeline-axis");
+      const timelineRange = mustGet("timeline-range");
+      const timelineUnit = mustGet("timeline-unit");
       const shareUrl = mustGet("share-url");
       const shareStatus = mustGet("share-status");
       const loadShare = mustGet("load-share");
@@ -590,10 +800,12 @@ function htmlPage(): string {
 
       function formatDate(value) {
         if (!value) {
-          return "kein Zeitstempel";
+          return "no timestamp";
         }
         const date = new Date(value);
-        return Number.isNaN(date.getTime()) ? value : date.toLocaleString("de-DE");
+        return Number.isNaN(date.getTime())
+          ? value
+          : date.toLocaleString("en-US", { dateStyle: "medium", timeStyle: "short" });
       }
 
       function normalizeExifDate(value) {
@@ -624,6 +836,214 @@ function htmlPage(): string {
         return Number.isNaN(date.getTime()) ? null : date.toISOString();
       }
 
+      function clamp(value, min, max) {
+        return Math.min(max, Math.max(min, value));
+      }
+
+      function getPhotoTimestamp(photo) {
+        if (!photo.capturedAt) {
+          return null;
+        }
+
+        const date = new Date(photo.capturedAt);
+        return Number.isNaN(date.getTime()) ? null : date;
+      }
+
+      function startOfHour(date) {
+        const copy = new Date(date);
+        copy.setMinutes(0, 0, 0);
+        return copy;
+      }
+
+      function startOfDay(date) {
+        const copy = new Date(date);
+        copy.setHours(0, 0, 0, 0);
+        return copy;
+      }
+
+      function startOfWeek(date) {
+        const copy = startOfDay(date);
+        const day = copy.getDay();
+        const offset = (day + 6) % 7;
+        copy.setDate(copy.getDate() - offset);
+        return copy;
+      }
+
+      function startOfMonth(date) {
+        const copy = startOfDay(date);
+        copy.setDate(1);
+        return copy;
+      }
+
+      function addUnit(date, unit) {
+        const copy = new Date(date);
+
+        if (unit === "hour") {
+          copy.setHours(copy.getHours() + 1);
+          return copy;
+        }
+
+        if (unit === "day") {
+          copy.setDate(copy.getDate() + 1);
+          return copy;
+        }
+
+        if (unit === "week") {
+          copy.setDate(copy.getDate() + 7);
+          return copy;
+        }
+
+        copy.setMonth(copy.getMonth() + 1);
+        return copy;
+      }
+
+      function getUnitStart(date, unit) {
+        if (unit === "hour") {
+          return startOfHour(date);
+        }
+
+        if (unit === "day") {
+          return startOfDay(date);
+        }
+
+        if (unit === "week") {
+          return startOfWeek(date);
+        }
+
+        return startOfMonth(date);
+      }
+
+      function chooseTimelineUnit(spanMs) {
+        const hour = 60 * 60 * 1000;
+        const day = 24 * hour;
+        const week = 7 * day;
+
+        if (spanMs <= 48 * hour) {
+          return "hour";
+        }
+
+        if (spanMs <= 21 * day) {
+          return "day";
+        }
+
+        if (spanMs <= 16 * week) {
+          return "week";
+        }
+
+        return "month";
+      }
+
+      function formatTimelineLabel(date, unit) {
+        if (unit === "hour") {
+          return date.toLocaleString("en-US", {
+            month: "short",
+            day: "numeric",
+            hour: "2-digit",
+            minute: "2-digit"
+          });
+        }
+
+        if (unit === "day") {
+          return date.toLocaleDateString("en-US", {
+            month: "short",
+            day: "numeric"
+          });
+        }
+
+        if (unit === "week") {
+          return date.toLocaleDateString("en-US", {
+            month: "short",
+            day: "numeric"
+          });
+        }
+
+        return date.toLocaleDateString("en-US", {
+          month: "short",
+          year: "numeric"
+        });
+      }
+
+      function formatTimelineSummary(photos, unit) {
+        if (!photos.length) {
+          return "No photos loaded yet.";
+        }
+
+        const count = photos.length + (photos.length === 1 ? " photo" : " photos");
+        const unitLabel = {
+          hour: "hourly",
+          day: "daily",
+          week: "weekly",
+          month: "monthly"
+        }[unit] || unit;
+
+        return count + " across a " + unitLabel + " timeline.";
+      }
+
+      function formatSelectionRange(start, end) {
+        return (
+          formatTimelineLabel(start, state.timeline.unit) +
+          " - " +
+          formatTimelineLabel(end, state.timeline.unit)
+        );
+      }
+
+      function buildTimeline(photos) {
+        const datedPhotos = photos
+          .map((photo) => ({ photo, date: getPhotoTimestamp(photo) }))
+          .filter((entry) => entry.date !== null)
+          .sort((a, b) => a.date.getTime() - b.date.getTime());
+
+        if (!datedPhotos.length) {
+          return {
+            unit: "day",
+            bins: [],
+            start: null,
+            end: null
+          };
+        }
+
+        const startDate = datedPhotos[0].date;
+        const endDate = datedPhotos[datedPhotos.length - 1].date;
+        const spanMs = Math.max(1, endDate.getTime() - startDate.getTime());
+        const unit = chooseTimelineUnit(spanMs);
+        const domainStart = getUnitStart(startDate, unit);
+        const domainEnd = addUnit(getUnitStart(endDate, unit), unit);
+        const bins = [];
+
+        for (let cursor = new Date(domainStart); cursor < domainEnd; cursor = addUnit(cursor, unit)) {
+          const next = addUnit(cursor, unit);
+          bins.push({
+            start: new Date(cursor),
+            end: next,
+            count: 0,
+            photoIds: [],
+            label: formatTimelineLabel(cursor, unit)
+          });
+        }
+
+        const binIndexByStart = new Map();
+        bins.forEach((bin, index) => {
+          binIndexByStart.set(bin.start.getTime(), index);
+        });
+
+        for (const entry of datedPhotos) {
+          const bucketStart = getUnitStart(entry.date, unit).getTime();
+          const binIndex = binIndexByStart.get(bucketStart);
+          if (binIndex !== undefined) {
+            const bin = bins[binIndex];
+            bin.count += 1;
+            bin.photoIds.push(entry.photo.id);
+          }
+        }
+
+        return {
+          unit,
+          bins,
+          start: domainStart,
+          end: domainEnd
+        };
+      }
+
       function updateStatus(message, tone = "info") {
         shareStatus.textContent = message;
         shareStatus.style.color = tone === "error" ? "#9d174d" : "var(--muted)";
@@ -652,10 +1072,30 @@ function htmlPage(): string {
 
       function clearGallery() {
         state.photos = [];
+        state.visiblePhotos = [];
+        state.activePhotoId = null;
+        state.timelineSelection = null;
+        state.timeline = {
+          unit: "day",
+          bins: [],
+          start: null,
+          end: null
+        };
         markers.clearLayers();
         route.setLatLngs([]);
         photoList.replaceChildren(emptyState);
+        emptyState.textContent = "No images loaded yet.";
         photoCount.textContent = "0 photos";
+        timelineSummary.textContent = "No photos loaded yet.";
+        timelineRange.textContent = "All photos";
+        timelineUnit.textContent = "Scale: day";
+        timelineClear.disabled = true;
+        timelineBars.replaceChildren();
+        timelineAxis.replaceChildren();
+        timelineSelection.classList.remove("visible");
+        timelineSelection.style.left = "0";
+        timelineSelection.style.width = "0";
+        timelineBrush.classList.remove("visible");
         setProgress(0, 0, "ready");
       }
 
@@ -679,8 +1119,8 @@ function htmlPage(): string {
         }
       });
 
-      function updateRouteView() {
-        const routePoints = state.photos
+      function updateRouteView(photos) {
+        const routePoints = photos
           .filter((photo) => photo.latitude !== null && photo.longitude !== null && photo.capturedAt)
           .sort((a, b) => String(a.capturedAt).localeCompare(String(b.capturedAt)))
           .map((photo) => [photo.latitude, photo.longitude]);
@@ -694,13 +1134,160 @@ function htmlPage(): string {
         }
       }
 
-      function appendPhoto(photo) {
-        state.photos.push(photo);
-        photoCount.textContent = state.photos.length + (state.photos.length === 1 ? " photo" : " photos");
-        if (emptyState.isConnected) {
-          emptyState.remove();
+      function isPhotoInSelection(photo, selection = state.timelineSelection) {
+        if (!selection) {
+          return true;
         }
 
+        const photoDate = getPhotoTimestamp(photo);
+        if (!photoDate) {
+          return false;
+        }
+
+        return photoDate.getTime() >= selection.start && photoDate.getTime() < selection.end;
+      }
+
+      function getVisiblePhotos() {
+        return state.photos.filter((photo) => isPhotoInSelection(photo));
+      }
+
+      function syncTimelineSelectionOverlay() {
+        const selection = state.timelineSelection;
+        if (!selection || !state.timeline.start || !state.timeline.end) {
+          timelineSelection.classList.remove("visible");
+          timelineSelection.style.left = "0";
+          timelineSelection.style.width = "0";
+          return;
+        }
+
+        const total = state.timeline.end.getTime() - state.timeline.start.getTime();
+        if (total <= 0) {
+          timelineSelection.classList.remove("visible");
+          return;
+        }
+
+        const left = clamp((selection.start - state.timeline.start.getTime()) / total, 0, 1);
+        const right = clamp((selection.end - state.timeline.start.getTime()) / total, 0, 1);
+        const startPct = Math.min(left, right) * 100;
+        const widthPct = Math.max(1, (Math.max(left, right) - Math.min(left, right)) * 100);
+        timelineSelection.classList.add("visible");
+        timelineSelection.style.left = startPct + "%";
+        timelineSelection.style.width = widthPct + "%";
+      }
+
+      function setTimelineSelection(start, end) {
+        if (start === null || end === null) {
+          state.timelineSelection = null;
+          timelineClear.disabled = true;
+        } else {
+          const normalizedStart = Math.min(start, end);
+          const normalizedEnd = Math.max(start, end);
+          state.timelineSelection = {
+            start: normalizedStart,
+            end: normalizedEnd
+          };
+          timelineClear.disabled = false;
+        }
+
+        renderVisiblePhotos({ fitMap: true });
+      }
+
+      function clearTimelineSelection() {
+        setTimelineSelection(null, null);
+      }
+
+      function renderTimeline() {
+        const timeline = buildTimeline(state.photos);
+        state.timeline = timeline;
+        timelineSummary.textContent = formatTimelineSummary(state.photos, timeline.unit);
+        timelineUnit.textContent = "Scale: " + timeline.unit;
+
+        timelineBars.replaceChildren();
+        timelineAxis.replaceChildren();
+
+        if (!timeline.bins.length) {
+          timelineRange.textContent = "All photos";
+          syncTimelineSelectionOverlay();
+          return;
+        }
+
+        const maxCount = Math.max(...timeline.bins.map((bin) => bin.count), 1);
+        const labelStep = Math.max(1, Math.ceil(timeline.bins.length / 6));
+
+        timeline.bins.forEach((bin, index) => {
+          const bar = document.createElement("button");
+          const isSelected = state.timelineSelection
+            ? bin.end.getTime() > state.timelineSelection.start && bin.start.getTime() < state.timelineSelection.end
+            : false;
+          const isActive = state.activePhotoId ? bin.photoIds.includes(state.activePhotoId) : false;
+
+          bar.type = "button";
+          bar.className = "timeline-bar" + (isSelected ? " selected" : "") + (isActive ? " active" : "");
+          bar.title = bin.label + " - " + bin.count + (bin.count === 1 ? " photo" : " photos");
+          bar.style.gridColumn = String(index + 1);
+
+          const fill = document.createElement("div");
+          fill.className = "timeline-bar-fill";
+          fill.style.height = Math.max(4, Math.round((bin.count / maxCount) * 100)) + "%";
+          bar.appendChild(fill);
+
+          const meta = document.createElement("span");
+          meta.className = "timeline-bar-meta";
+          meta.textContent = index % labelStep === 0 || index === timeline.bins.length - 1 ? bin.label : "";
+          bar.appendChild(meta);
+
+          bar.addEventListener("click", () => {
+            if (timelineClickSuppressed) {
+              return;
+            }
+            setTimelineSelection(bin.start.getTime(), bin.end.getTime());
+          });
+
+          timelineBars.appendChild(bar);
+        });
+
+        const selection = state.timelineSelection;
+        timelineRange.textContent = selection
+          ? formatSelectionRange(new Date(selection.start), new Date(selection.end))
+          : "All photos";
+
+        const axisLabels = [];
+        timeline.bins.forEach((bin, index) => {
+          if (index % labelStep !== 0 && index !== timeline.bins.length - 1) {
+            return;
+          }
+
+          const label = document.createElement("span");
+          label.className = "timeline-axis-label";
+          const position = timeline.bins.length === 1 ? 0 : index / (timeline.bins.length - 1);
+          label.style.left = position * 100 + "%";
+          label.textContent = bin.label;
+          axisLabels.push(label);
+        });
+
+        axisLabels.forEach((label) => timelineAxis.appendChild(label));
+        syncTimelineSelectionOverlay();
+      }
+
+      function renderVisiblePhotos(options = {}) {
+        const visiblePhotos = getVisiblePhotos();
+        state.visiblePhotos = visiblePhotos;
+        markers.clearLayers();
+        route.setLatLngs([]);
+        photoList.replaceChildren();
+
+        if (!visiblePhotos.length) {
+          emptyState.textContent = state.photos.length
+            ? "No photos match the selected range."
+            : "No images loaded yet.";
+          photoList.appendChild(emptyState);
+          photoCount.textContent = "0 photos";
+        } else {
+          emptyState.textContent = "No images loaded yet.";
+          photoCount.textContent =
+            visiblePhotos.length + (visiblePhotos.length === 1 ? " photo shown" : " photos shown");
+
+          for (const photo of visiblePhotos) {
             if (photo.latitude !== null && photo.longitude !== null) {
               const marker = L.marker([photo.latitude, photo.longitude]).addTo(markers);
 
@@ -714,40 +1301,166 @@ function htmlPage(): string {
               );
 
               marker.on("mouseover", () => marker.openPopup());
-          marker.on("click", () => openOverlay(photo));
+              marker.on("click", () => {
+                state.activePhotoId = photo.id;
+                renderVisiblePhotos({ fitMap: false });
+                openOverlay(photo);
+              });
             }
 
             const item = document.createElement("article");
-        item.className = "photo";
+            item.className = "photo" + (photo.id === state.activePhotoId ? " active" : "");
             item.innerHTML =
               '<img src="' + photo.thumbUrl + '" alt="' + photo.name + '" />' +
               '<div><strong>' + photo.name + '</strong><span>' + formatDate(photo.capturedAt) + '</span></div>';
-        item.addEventListener("click", () => openOverlay(photo));
+            item.addEventListener("click", () => {
+              state.activePhotoId = photo.id;
+              renderVisiblePhotos({ fitMap: false });
+              openOverlay(photo);
+            });
             photoList.appendChild(item);
-
-        updateRouteView();
+          }
         }
 
-      function parseShareInput(value) {
-        const trimmed = value.trim();
-        const url = new URL(trimmed);
-        const publicShare = url.pathname.match(/\\\/s\\\/([^/?#]+)/);
-        if (publicShare) {
-          return {
-            origin: url.origin,
-            davUrl: url.origin + "/public.php/dav/files/" + publicShare[1] + "/"
+        updateRouteView(visiblePhotos);
+        renderTimeline();
+
+        if (options.fitMap && visiblePhotos.length) {
+          const bounds = visiblePhotos.filter((photo) => photo.latitude !== null && photo.longitude !== null);
+          if (bounds.length === 1) {
+            map.setView([bounds[0].latitude, bounds[0].longitude], 13);
+          } else if (bounds.length > 1) {
+            map.fitBounds(bounds.map((photo) => [photo.latitude, photo.longitude]), { padding: [40, 40] });
+          }
+        }
+      }
+
+      let timelinePointerState = null;
+      let timelineClickSuppressed = false;
+
+      function updateTimelineBrushOverlay(startX, endX) {
+        if (!state.timeline.start || !state.timeline.end) {
+          timelineBrush.classList.remove("visible");
+          return;
+        }
+
+        const width = timelineChart.getBoundingClientRect().width;
+        if (width <= 0) {
+          timelineBrush.classList.remove("visible");
+          return;
+        }
+
+        const leftX = clamp(Math.min(startX, endX), 0, width);
+        const rightX = clamp(Math.max(startX, endX), 0, width);
+        timelineBrush.classList.add("visible");
+        timelineBrush.style.left = leftX + "px";
+        timelineBrush.style.width = Math.max(1, rightX - leftX) + "px";
+      }
+
+      function clearTimelineBrushOverlay() {
+        timelineBrush.classList.remove("visible");
+        timelineBrush.style.left = "0";
+        timelineBrush.style.width = "0";
+      }
+
+      function timeFromTimelineX(x) {
+        if (!state.timeline.start || !state.timeline.end) {
+          return null;
+        }
+
+        const width = timelineChart.getBoundingClientRect().width;
+        if (width <= 0) {
+          return null;
+        }
+
+        const ratio = clamp(x / width, 0, 1);
+        const time = state.timeline.start.getTime() + ratio * (state.timeline.end.getTime() - state.timeline.start.getTime());
+        return new Date(time);
+      }
+
+      function selectTimelineBinAtX(x) {
+        if (!state.timeline.bins.length || !state.timeline.start || !state.timeline.end) {
+          return;
+        }
+
+        const width = timelineChart.getBoundingClientRect().width;
+        if (width <= 0) {
+          return;
+        }
+
+        const ratio = clamp(x / width, 0, 1);
+        const index = clamp(Math.floor(ratio * state.timeline.bins.length), 0, state.timeline.bins.length - 1);
+        const bin = state.timeline.bins[index];
+        setTimelineSelection(bin.start.getTime(), bin.end.getTime());
+      }
+
+      timelineChart.addEventListener("pointerdown", (event) => {
+        if (!state.timeline.bins.length) {
+          return;
+        }
+
+        const rect = timelineChart.getBoundingClientRect();
+        const startX = event.clientX - rect.left;
+        timelinePointerState = {
+          pointerId: event.pointerId,
+          startX,
+          currentX: startX,
+          moved: false
         };
+
+        timelineChart.setPointerCapture(event.pointerId);
+        updateTimelineBrushOverlay(startX, startX);
+      });
+
+      timelineChart.addEventListener("pointermove", (event) => {
+        if (!timelinePointerState || timelinePointerState.pointerId !== event.pointerId) {
+          return;
         }
 
-        const davShare = url.pathname.match(/\\\/public\\.php\\\/dav\\\/files\\\/([^/?#]+)\\\/?/);
-        if (davShare) {
-          return {
-            origin: url.origin,
-            davUrl: url.origin + "/public.php/dav/files/" + davShare[1] + "/"
-          };
+        const rect = timelineChart.getBoundingClientRect();
+        const currentX = event.clientX - rect.left;
+        timelinePointerState.currentX = currentX;
+        timelinePointerState.moved = timelinePointerState.moved || Math.abs(currentX - timelinePointerState.startX) > 4;
+        updateTimelineBrushOverlay(timelinePointerState.startX, currentX);
+      });
+
+      function finishTimelinePointer(event) {
+        if (!timelinePointerState || timelinePointerState.pointerId !== event.pointerId) {
+          return;
         }
 
-        throw new Error("Please enter a public Nextcloud share link.");
+        try {
+          timelineChart.releasePointerCapture(event.pointerId);
+        } catch {
+          // Pointer capture may already be released.
+        }
+
+        if (timelinePointerState.moved) {
+          const startTime = timeFromTimelineX(timelinePointerState.startX);
+          const endTime = timeFromTimelineX(timelinePointerState.currentX);
+          if (startTime && endTime) {
+            setTimelineSelection(startTime.getTime(), endTime.getTime());
+          }
+          timelineClickSuppressed = true;
+          setTimeout(() => {
+            timelineClickSuppressed = false;
+          }, 0);
+        } else {
+          selectTimelineBinAtX(timelinePointerState.currentX);
+        }
+
+        clearTimelineBrushOverlay();
+        timelinePointerState = null;
+      }
+
+      timelineChart.addEventListener("pointerup", finishTimelinePointer);
+      timelineChart.addEventListener("pointercancel", finishTimelinePointer);
+
+      timelineClear.addEventListener("click", clearTimelineSelection);
+
+      function appendPhoto(photo) {
+        state.photos.push(photo);
+        renderVisiblePhotos({ fitMap: state.photos.length === 1 });
       }
 
       function textContent(node, namespace, localName) {