Render all place photos in a carousel

app/components/place-details.gjs

@@ -12,8 +12,7 @@ import PlaceListsManager from './place-lists-manager';
 import PlacePhotoUpload from './place-photo-upload';
 import NostrConnect from './nostr-connect';
 import Modal from './modal';
-import Blurhash from './blurhash';
-import fadeInImage from '../modifiers/fade-in-image';
+import PlacePhotosCarousel from './place-photos-carousel';
 
 import { tracked } from '@glimmer/tracking';
 import { action } from '@ember/object';
@@ -79,51 +78,71 @@ export default class PlaceDetails extends Component {
     return this.place.title || getLocalizedName(this.tags) || 'Unnamed Place';
   }
 
-  get headerPhoto() {
-    const photos = this.nostrData.placePhotos;
-    if (!photos || photos.length === 0) return null;
+  get photos() {
+    const rawPhotos = this.nostrData.placePhotos;
+    if (!rawPhotos || rawPhotos.length === 0) return [];
 
     // Sort by created_at ascending (oldest first)
-    const sortedEvents = [...photos].sort(
+    const sortedEvents = [...rawPhotos].sort(
       (a, b) => a.created_at - b.created_at
     );
 
-    let firstPortrait = null;
+    const allPhotos = [];
 
     for (const event of sortedEvents) {
       // Find all imeta tags
       const imetas = event.tags.filter((t) => t[0] === 'imeta');
       for (const imeta of imetas) {
         let url = null;
+        let thumbUrl = null;
         let blurhash = null;
         let isLandscape = false;
+        let aspectRatio = 16 / 9; // default
 
         for (const tag of imeta.slice(1)) {
           if (tag.startsWith('url ')) {
             url = tag.substring(4);
+          } else if (tag.startsWith('thumb ')) {
+            thumbUrl = tag.substring(6);
           } else if (tag.startsWith('blurhash ')) {
             blurhash = tag.substring(9);
           } else if (tag.startsWith('dim ')) {
             const dimStr = tag.substring(4);
             const [width, height] = dimStr.split('x').map(Number);
-            if (width && height && width > height) {
-              isLandscape = true;
+            if (width && height) {
+              aspectRatio = width / height;
+              if (width > height) {
+                isLandscape = true;
+              }
             }
           }
         }
 
         if (url) {
-          const photoData = { url, blurhash };
-          if (isLandscape) {
-            return photoData; // Return the first landscape photo found
-          } else if (!firstPortrait) {
-            firstPortrait = photoData; // Save the first portrait as fallback
-          }
+          allPhotos.push({
+            url,
+            thumbUrl,
+            blurhash,
+            isLandscape,
+            aspectRatio,
+            style: htmlSafe(`--slide-ratio: ${aspectRatio};`),
+          });
         }
       }
     }
 
-    return firstPortrait;
+    if (allPhotos.length === 0) return [];
+
+    // Find the first landscape photo
+    const firstLandscapeIndex = allPhotos.findIndex((p) => p.isLandscape);
+
+    if (firstLandscapeIndex > 0) {
+      // Move the first landscape photo to the front
+      const [firstLandscape] = allPhotos.splice(firstLandscapeIndex, 1);
+      allPhotos.unshift(firstLandscape);
+    }
+
+    return allPhotos;
   }
 
   @action
@@ -389,24 +408,7 @@ export default class PlaceDetails extends Component {
           @onCancel={{this.cancelEditing}}
         />
       {{else}}
-        {{#if this.headerPhoto}}
-          <div class="place-header-photo-wrapper">
-            {{#if this.headerPhoto.blurhash}}
-              <Blurhash
-                @hash={{this.headerPhoto.blurhash}}
-                @width={{32}}
-                @height={{18}}
-                class="place-header-photo-blur"
-              />
-            {{/if}}
-            <img
-              src={{this.headerPhoto.url}}
-              class="place-header-photo"
-              alt={{this.name}}
-              {{fadeInImage this.headerPhoto.url}}
-            />
-          </div>
-        {{/if}}
+        <PlacePhotosCarousel @photos={{this.photos}} @name={{this.name}} />
         <h3>{{this.name}}</h3>
         <p class="place-type">
           {{this.type}}

app/components/place-photos-carousel.gjs

@@ -0,0 +1,155 @@
+import Component from '@glimmer/component';
+import { tracked } from '@glimmer/tracking';
+import { action } from '@ember/object';
+import Blurhash from './blurhash';
+import Icon from './icon';
+import fadeInImage from '../modifiers/fade-in-image';
+import { on } from '@ember/modifier';
+import { modifier } from 'ember-modifier';
+
+export default class PlacePhotosCarousel extends Component {
+  @tracked canScrollLeft = false;
+  @tracked canScrollRight = false;
+
+  carouselElement = null;
+
+  get photos() {
+    return this.args.photos || [];
+  }
+
+  get showChevrons() {
+    return this.photos.length > 1;
+  }
+
+  get cannotScrollLeft() {
+    return !this.canScrollLeft;
+  }
+
+  get cannotScrollRight() {
+    return !this.canScrollRight;
+  }
+
+  setupCarousel = modifier((element) => {
+    this.carouselElement = element;
+
+    // Defer the initial calculation slightly to ensure CSS and images have applied
+    setTimeout(() => {
+      this.updateScrollState();
+    }, 50);
+
+    let resizeObserver;
+    if (window.ResizeObserver) {
+      resizeObserver = new ResizeObserver(() => this.updateScrollState());
+      resizeObserver.observe(element);
+    }
+
+    return () => {
+      if (resizeObserver) {
+        resizeObserver.unobserve(element);
+      }
+    };
+  });
+
+  @action
+  updateScrollState() {
+    if (!this.carouselElement) return;
+
+    const { scrollLeft, scrollWidth, clientWidth } = this.carouselElement;
+    // tolerance of 1px for floating point rounding issues
+    this.canScrollLeft = scrollLeft > 1;
+    this.canScrollRight = scrollLeft + clientWidth < scrollWidth - 1;
+  }
+
+  @action
+  scrollLeft() {
+    if (!this.carouselElement) return;
+    this.carouselElement.scrollBy({
+      left: -this.carouselElement.clientWidth,
+      behavior: 'smooth',
+    });
+  }
+
+  @action
+  scrollRight() {
+    if (!this.carouselElement) return;
+    this.carouselElement.scrollBy({
+      left: this.carouselElement.clientWidth,
+      behavior: 'smooth',
+    });
+  }
+
+  <template>
+    {{#if this.photos.length}}
+      <div class="place-photos-carousel-wrapper">
+        <div
+          class="place-photos-carousel-track"
+          {{this.setupCarousel}}
+          {{on "scroll" this.updateScrollState}}
+        >
+          {{#each this.photos as |photo|}}
+            {{! template-lint-disable no-inline-styles }}
+            <div class="carousel-slide" style={{photo.style}}>
+              {{#if photo.blurhash}}
+                <Blurhash
+                  @hash={{photo.blurhash}}
+                  @width={{32}}
+                  @height={{18}}
+                  class="place-header-photo-blur"
+                />
+              {{/if}}
+
+              {{#if photo.isLandscape}}
+                <picture>
+                  {{#if photo.thumbUrl}}
+                    <source
+                      media="(max-width: 768px)"
+                      srcset={{photo.thumbUrl}}
+                    />
+                  {{/if}}
+                  <img
+                    src={{photo.url}}
+                    class="place-header-photo landscape"
+                    alt={{@name}}
+                    {{fadeInImage photo.url}}
+                  />
+                </picture>
+              {{else}}
+                {{! Portrait uses thumb everywhere if available }}
+                <img
+                  src={{if photo.thumbUrl photo.thumbUrl photo.url}}
+                  class="place-header-photo portrait"
+                  alt={{@name}}
+                  {{fadeInImage (if photo.thumbUrl photo.thumbUrl photo.url)}}
+                />
+              {{/if}}
+            </div>
+          {{/each}}
+        </div>
+
+        {{#if this.showChevrons}}
+          <button
+            type="button"
+            class="carousel-nav-btn prev
+              {{if this.cannotScrollLeft 'disabled'}}"
+            {{on "click" this.scrollLeft}}
+            disabled={{this.cannotScrollLeft}}
+            aria-label="Previous photo"
+          >
+            <Icon @name="chevron-left" />
+          </button>
+
+          <button
+            type="button"
+            class="carousel-nav-btn next
+              {{if this.cannotScrollRight 'disabled'}}"
+            {{on "click" this.scrollRight}}
+            disabled={{this.cannotScrollRight}}
+            aria-label="Next photo"
+          >
+            <Icon @name="chevron-right" />
+          </button>
+        {{/if}}
+      </div>
+    {{/if}}
+  </template>
+}

app/styles/app.css

@@ -860,12 +860,33 @@ abbr[title] {
   padding-bottom: 2rem;
 }
 
-.place-header-photo-wrapper {
-  margin: -1rem -1rem 1rem;
-  background-color: var(--hover-bg);
+.place-photos-carousel-wrapper {
   position: relative;
-  overflow: hidden;
+  margin: -1rem -1rem 1rem;
+}
+
+.place-photos-carousel-track {
+  display: flex;
+  overflow-x: auto;
+  scroll-behavior: smooth;
+  scroll-snap-type: x mandatory;
+  scrollbar-width: none; /* Firefox */
+  background-color: var(--hover-bg);
+}
+
+.place-photos-carousel-track::-webkit-scrollbar {
+  display: none; /* Safari and Chrome */
+}
+
+.carousel-slide {
+  position: relative;
+  flex: 0 0 100%;
+  scroll-snap-align: start;
   aspect-ratio: 16 / 9;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  overflow: hidden;
 }
 
 .place-header-photo-blur {
@@ -884,10 +905,18 @@ abbr[title] {
   left: 0;
   width: 100%;
   height: 100%;
-  object-fit: cover;
   display: block;
   opacity: 0;
   transition: opacity 0.3s ease-in-out;
+  z-index: 1; /* Stay above blurhash */
+}
+
+.place-header-photo.landscape {
+  object-fit: cover;
+}
+
+.place-header-photo.portrait {
+  object-fit: contain;
 }
 
 .place-header-photo.loaded {
@@ -899,6 +928,75 @@ abbr[title] {
   transition: none;
 }
 
+.carousel-nav-btn {
+  position: absolute;
+  top: 50%;
+  transform: translateY(-50%);
+  background: rgb(0 0 0 / 50%);
+  color: white;
+  border: none;
+  border-radius: 50%;
+  width: 36px;
+  height: 36px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  z-index: 2;
+  opacity: 0;
+  transition:
+    opacity 0.2s,
+    background-color 0.2s;
+  padding: 0;
+}
+
+.place-photos-carousel-wrapper:hover .carousel-nav-btn {
+  opacity: 1;
+}
+
+.carousel-nav-btn:hover {
+  background: rgb(0 0 0 / 80%);
+}
+
+.carousel-nav-btn.disabled {
+  opacity: 0;
+  pointer-events: none;
+}
+
+.carousel-nav-btn.prev {
+  left: 0.5rem;
+}
+
+.carousel-nav-btn.next {
+  right: 0.5rem;
+}
+
+@media (width <= 768px) {
+  .place-photos-carousel-track {
+    scroll-snap-type: none; /* No snapping on mobile */
+    gap: 0.25rem;
+    padding-bottom: 0.5rem; /* Space for the scrollbar if visible, but we hid it */
+  }
+
+  .carousel-slide {
+    flex: 0 0 auto;
+    height: 100px;
+    width: calc(100px * var(--slide-ratio, 1.7778));
+    aspect-ratio: auto;
+    scroll-snap-align: none;
+  }
+
+  .place-header-photo.landscape,
+  .place-header-photo.portrait {
+    /* On mobile, all images use cover inside their precise ratio container */
+    object-fit: cover;
+  }
+
+  .carousel-nav-btn {
+    display: none;
+  }
+}
+
 .place-details h3 {
   font-size: 1.2rem;
   margin-top: 0;

app/utils/icons.js

@@ -4,6 +4,8 @@ import arrowLeft from 'feather-icons/dist/icons/arrow-left.svg?raw';
 import bookmark from 'feather-icons/dist/icons/bookmark.svg?raw';
 import camera from 'feather-icons/dist/icons/camera.svg?raw';
 import checkSquare from 'feather-icons/dist/icons/check-square.svg?raw';
+import chevronLeft from 'feather-icons/dist/icons/chevron-left.svg?raw';
+import chevronRight from 'feather-icons/dist/icons/chevron-right.svg?raw';
 import clock from 'feather-icons/dist/icons/clock.svg?raw';
 import edit from 'feather-icons/dist/icons/edit.svg?raw';
 import facebook from 'feather-icons/dist/icons/facebook.svg?raw';
@@ -132,6 +134,8 @@ const ICONS = {
   bus,
   camera,
   'check-square': checkSquare,
+  'chevron-left': chevronLeft,
+  'chevron-right': chevronRight,
   'cigarette-with-smoke-curl': cigaretteWithSmokeCurl,
   climbing_wall: climbingWall,
   check,