<script lang="ts">
  import DiscussionsFeed from "$lib/components/DiscussionsFeed.svelte";
  import PostContent from "$lib/components/PostContent.svelte";
  import Tag from "$lib/components/Tag.svelte";
  import { groupsStore } from "$lib/groups.svelte";
  import { overviewStore, loadOverview } from "$lib/overview.svelte";
  import { partialsStore } from "$lib/partials.svelte";
  import { MODE, GROUP_ID, SEARCH_ENABLED } from "$lib/config";
  import SearchInline from "$lib/components/SearchInline.svelte";
  import type { NostrUser } from "@nostr/gadgets/metadata";

  const partial = $derived(partialsStore.get("home"));

  // Full mode: load per-room activity + recent threads once the rooms are known.
  $effect(() => {
    if (MODE !== "full") return;
    const ids = groupsStore.list.map((g) => g.id);
    if (ids.length > 0) loadOverview(ids);
  });

  function relativeTime(ts: number): string {
    const diff = Math.floor(Date.now() / 1000) - ts;
    if (diff < 60) return "now";
    if (diff < 3600) return `${Math.floor(diff / 60)}m`;
    if (diff < 86400) return `${Math.floor(diff / 3600)}h`;
    return `${Math.floor(diff / 86400)}d`;
  }

  function authorOf(pubkey: string) {
    const u: NostrUser | undefined = overviewStore.profiles[pubkey];
    return {
      name: u?.shortName ?? pubkey.slice(0, 8),
      picture: u?.metadata?.picture,
    };
  }
</script>

<svelte:head>
  <title>{MODE === "full" ? "Rooms" : "Discussions"}</title>
</svelte:head>

{#snippet pic(a: { name: string; picture?: string })}
  {#if a.picture}
    <img src={a.picture} alt="" class="h-5 w-5 rounded-full object-cover" />
  {:else}
    <span
      class="flex h-5 w-5 items-center justify-center rounded-full bg-neutral-200 text-[10px] font-semibold text-neutral-500 dark:bg-neutral-700 dark:text-neutral-400"
      aria-hidden="true"
    >
      {a.name[0].toUpperCase()}
    </span>
  {/if}
{/snippet}

{#if SEARCH_ENABLED}
  <div class="mt-2 mb-6">
    <SearchInline />
  </div>
{/if}

{#if partial}
  <div class="mt-2 mb-8">
    <PostContent content={partial.content} headingOffset={0} />
  </div>
{/if}

{#if MODE === "simple"}
  <DiscussionsFeed groupId={GROUP_ID} title="Discussions" />
{:else}
  {#if partial}
    <hr class="text-neutral-300 dark:text-neutral-600" />
  {:else}
    <h1 class="text-accent py-2 text-[1.65rem]">Forum rooms</h1>
  {/if}

  {#if groupsStore.list.length === 0}
    <p class="py-6 text-sm text-neutral-400 dark:text-neutral-500">
      {groupsStore.loaded ? "No rooms available yet." : "Loading rooms…"}
    </p>
  {/if}

  <div class="divide-y divide-neutral-100 dark:divide-neutral-800">
    {#each groupsStore.list as room}
      {@const act = overviewStore.activity[room.id]}
      {@const adminPk = overviewStore.admins[room.id]}
      {@const admin = adminPk ? authorOf(adminPk) : null}
      {@const last = act ? authorOf(act.latestPubkey) : null}
      <a
        href="/room/{room.id}"
        class="group flex items-start justify-between gap-4 py-5 hover:bg-linear-to-r hover:from-transparent hover:via-neutral-100 hover:to-transparent dark:hover:bg-linear-to-r dark:hover:from-transparent dark:hover:via-neutral-800 dark:hover:to-transparent"
      >
        <div class="min-w-0 flex-1">
          <h2
            class="group-hover:text-accent text-2xl text-neutral-800 dark:text-neutral-200"
          >
            {room.name}
          </h2>
          {#if room.about}
            <p class="mt-1 leading-5 text-neutral-600 dark:text-neutral-400">
              {room.about}
            </p>
          {/if}
          {#if admin || room.flags.length > 0}
            <div
              class="mt-2 flex items-center gap-2 text-sm text-neutral-500 dark:text-neutral-400"
            >
              {#if admin}
                <span>Admin</span>
                {@render pic(admin)}
              {/if}
              {#if room.flags.length > 0}
                <div
                  class="ml-auto flex flex-wrap items-center justify-end gap-1"
                >
                  {#each room.flags as f}
                    <Tag label={f[0].toUpperCase() + f.slice(1)} />
                  {/each}
                </div>
              {/if}
            </div>
          {/if}
        </div>
        {#if act && last}
          <div class="flex shrink-0 flex-col items-center gap-0.5">
            <div class="flex items-center gap-1">
              {@render pic(last)}
              <span class="text-neutral-800 dark:text-neutral-200"
                >{relativeTime(act.latestAt)}</span
              >
            </div>
            <span class="text-sm text-neutral-400 dark:text-neutral-500"
              >activity</span
            >
          </div>
        {/if}
      </a>
    {/each}
  </div>
{/if}
