Move derivation of the synthesized view of channels (and messages) into `session`.

2 files changed, 3 insertions, 25 deletions

diff --git a/ui/routes/(app)/+layout.svelte b/ui/routes/(app)/+layout.svelte
index 90fa82e..c7e1f22 100644
--- a/ui/routes/(app)/+layout.svelte
+++ b/ui/routes/(app)/+layout.svelte
@@ -22,29 +22,7 @@
   let pageContext = getContext('page');
   let channel = $derived(page.params.channel);
 
-  let rawChannels = $derived(session.channels);
-  let rawChannelsMeta = $derived(session.local.all);
-  let rawMessages = $derived(session.messages);
-
-  function enrichChannels(channels, channelsMeta, messages) {
-    const enrichedChannels = [];
-    for (const ch of channels.values()) {
-      const createdAt = ch.at;
-      const channelMessages = messages.filter((message) => message.channel === ch.id);
-      const sentAt = channelMessages.map((message) => message.at);
-      const lastEventAt = Math.max(createdAt, ...sentAt);
-
-      const lastReadAt = channelsMeta.get(ch.id)?.lastReadAt;
-      const hasUnreads = lastReadAt === undefined || lastEventAt > lastReadAt;
-      enrichedChannels.push({
-        ...ch,
-        hasUnreads
-      });
-    }
-    return enrichedChannels;
-  }
-
-  const enrichedChannels = $derived(enrichChannels(rawChannels, rawChannelsMeta, rawMessages));
+  let channels = $derived(session.channels);
 
   function setUpGestures() {
     if (!browser) {
@@ -136,7 +114,7 @@
 
 <div id="interface">
   <nav id="sidebar" data-expanded={pageContext.showMenu}>
-    <ChannelList active={channel} channels={enrichedChannels} />
+    <ChannelList active={channel} {channels} />
     <div class="create-channel">
       <CreateChannelForm {createChannel} />
     </div>
diff --git a/ui/routes/(app)/ch/[channel]/+page.svelte b/ui/routes/(app)/ch/[channel]/+page.svelte
index 1130cd4..ea8cca6 100644
--- a/ui/routes/(app)/ch/[channel]/+page.svelte
+++ b/ui/routes/(app)/ch/[channel]/+page.svelte
@@ -11,7 +11,7 @@
   let activeChannel;
 
   const channelId = $derived(page.params.channel);
-  const channel = $derived(session.channels.get(channelId));
+  const channel = $derived(session.channels.find((channel) => channel.id === channelId));
   const messages = $derived(session.messages.filter((message) => message.channel === channelId));
   const unsent = $derived(outbox.messages.filter((message) => message.channel === channelId));
   const deleted = $derived(outbox.deleted.map((message) => message.messageId));