From 85a8699b7892eeb02aca8b471b62d1d66f81a075 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A2u=20Cao?= <raucao@kosmos.org>
Date: Tue, 21 Apr 2026 23:07:06 +0400
Subject: [PATCH] Render header photo in place details

Shows the blurhash and fades in the image once downloaded
---
 app/components/blurhash.gjs       | 37 +++++++++++++++++
 app/components/place-details.gjs  | 68 +++++++++++++++++++++++++++++++
 app/components/places-sidebar.gjs | 11 ++++-
 app/modifiers/fade-in-image.js    | 30 ++++++++++++++
 app/styles/app.css                | 43 +++++++++++++++++++
 app/utils/poi-categories.js       |  2 +-
 6 files changed, 189 insertions(+), 2 deletions(-)
 create mode 100644 app/components/blurhash.gjs
 create mode 100644 app/modifiers/fade-in-image.js

diff --git a/app/components/blurhash.gjs b/app/components/blurhash.gjs
new file mode 100644
index 0000000..0dee902
--- /dev/null
+++ b/app/components/blurhash.gjs
@@ -0,0 +1,37 @@
+import Component from '@glimmer/component';
+import { modifier } from 'ember-modifier';
+import { decode } from 'blurhash';
+
+export default class Blurhash extends Component {
+  renderBlurhash = modifier((canvas, [hash, width, height]) => {
+    if (!hash || !canvas) return;
+
+    // Default size to a small multiple of aspect ratio to save CPU
+    // 32x18 is a good balance of speed vs quality for 16:9
+    const renderWidth = width || 32;
+    const renderHeight = height || 18;
+
+    canvas.width = renderWidth;
+    canvas.height = renderHeight;
+
+    const ctx = canvas.getContext('2d');
+    if (!ctx) return;
+
+    try {
+      const pixels = decode(hash, renderWidth, renderHeight);
+      const imageData = ctx.createImageData(renderWidth, renderHeight);
+      imageData.data.set(pixels);
+      ctx.putImageData(imageData, 0, 0);
+    } catch (e) {
+      console.warn('Failed to decode blurhash:', e);
+    }
+  });
+
+  <template>
+    <canvas
+      class="blurhash-canvas"
+      ...attributes
+      {{this.renderBlurhash @hash @width @height}}
+    ></canvas>
+  </template>
+}
diff --git a/app/components/place-details.gjs b/app/components/place-details.gjs
index 4c3acb6..662fa30 100644
--- a/app/components/place-details.gjs
+++ b/app/components/place-details.gjs
@@ -12,6 +12,8 @@ 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 { tracked } from '@glimmer/tracking';
 import { action } from '@ember/object';
@@ -19,6 +21,7 @@ import { action } from '@ember/object';
 export default class PlaceDetails extends Component {
   @service storage;
   @service nostrAuth;
+  @service nostrData;
   @tracked isEditing = false;
   @tracked showLists = false;
   @tracked isPhotoUploadModalOpen = false;
@@ -76,6 +79,53 @@ 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;
+
+    // Sort by created_at ascending (oldest first)
+    const sortedEvents = [...photos].sort(
+      (a, b) => a.created_at - b.created_at
+    );
+
+    let firstPortrait = null;
+
+    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 blurhash = null;
+        let isLandscape = false;
+
+        for (const tag of imeta.slice(1)) {
+          if (tag.startsWith('url ')) {
+            url = tag.substring(4);
+          } 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 (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
+          }
+        }
+      }
+    }
+
+    return firstPortrait;
+  }
+
   @action
   startEditing() {
     if (!this.isSaved) return; // Only allow editing saved places
@@ -339,6 +389,24 @@ 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}}
         <h3>{{this.name}}</h3>
         <p class="place-type">
           {{this.type}}
diff --git a/app/components/places-sidebar.gjs b/app/components/places-sidebar.gjs
index bf39204..e3bcc2d 100644
--- a/app/components/places-sidebar.gjs
+++ b/app/components/places-sidebar.gjs
@@ -14,6 +14,7 @@ export default class PlacesSidebar extends Component {
   @service storage;
   @service router;
   @service mapUi;
+  @service nostrData;
 
   @action
   createNewPlace() {
@@ -149,9 +150,17 @@ export default class PlacesSidebar extends Component {
     return !qp.q && !qp.category && qp.lat && qp.lon;
   }
 
+  get hasHeaderPhoto() {
+    return (
+      this.args.selectedPlace &&
+      this.nostrData.placePhotos &&
+      this.nostrData.placePhotos.length > 0
+    );
+  }
+
   <template>
     <div class="sidebar">
-      <div class="sidebar-header">
+      <div class="sidebar-header {{if this.hasHeaderPhoto 'no-border'}}">
         {{#if @selectedPlace}}
           <button
             type="button"
diff --git a/app/modifiers/fade-in-image.js b/app/modifiers/fade-in-image.js
new file mode 100644
index 0000000..8269c10
--- /dev/null
+++ b/app/modifiers/fade-in-image.js
@@ -0,0 +1,30 @@
+import { modifier } from 'ember-modifier';
+
+export default modifier((element, [url]) => {
+  if (!url) return;
+
+  // Remove classes when URL changes
+  element.classList.remove('loaded');
+  element.classList.remove('loaded-instant');
+
+  // Create an off-DOM image to reliably check cache status
+  // without waiting for the actual DOM element to load it
+  const img = new Image();
+  img.src = url;
+
+  if (img.complete) {
+    // Already in browser cache, skip the animation
+    element.classList.add('loaded-instant');
+    return;
+  }
+
+  const handleLoad = () => {
+    element.classList.add('loaded');
+  };
+
+  element.addEventListener('load', handleLoad);
+
+  return () => {
+    element.removeEventListener('load', handleLoad);
+  };
+});
diff --git a/app/styles/app.css b/app/styles/app.css
index b39146f..b1063a7 100644
--- a/app/styles/app.css
+++ b/app/styles/app.css
@@ -462,6 +462,10 @@ body {
   align-items: center;
 }
 
+.sidebar-header.no-border {
+  border-bottom-color: transparent;
+}
+
 .sidebar-header h2 {
   margin: 0;
   font-size: 1.2rem;
@@ -856,6 +860,45 @@ abbr[title] {
   padding-bottom: 2rem;
 }
 
+.place-header-photo-wrapper {
+  margin: -1rem -1rem 1rem;
+  background-color: var(--hover-bg);
+  position: relative;
+  overflow: hidden;
+  aspect-ratio: 16 / 9;
+}
+
+.place-header-photo-blur {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  display: block;
+}
+
+.place-header-photo {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  display: block;
+  opacity: 0;
+  transition: opacity 0.3s ease-in-out;
+}
+
+.place-header-photo.loaded {
+  opacity: 1;
+}
+
+.place-header-photo.loaded-instant {
+  opacity: 1;
+  transition: none;
+}
+
 .place-details h3 {
   font-size: 1.2rem;
   margin-top: 0;
diff --git a/app/utils/poi-categories.js b/app/utils/poi-categories.js
index 966eeac..78c4ef4 100644
--- a/app/utils/poi-categories.js
+++ b/app/utils/poi-categories.js
@@ -55,7 +55,7 @@ export const POI_CATEGORIES = [
     id: 'accommodation',
     label: 'Hotels',
     icon: 'person-sleeping-in-bed',
-    filter: ['["tourism"~"^(hotel|hostel|motel)$"]'],
+    filter: ['["tourism"~"^(hotel|hostel|motel|chalet)$"]'],
     types: ['node', 'way', 'relation'],
   },
 ];