// static/js/05-feed.js
"use strict";

window.Glow = window.Glow || {};

Glow.clearFeed = () => {
  Glow.state.feedLastSeenId = 0;
  Glow.state.feedKnownMessageIds.clear();
  Glow.state.feedEntries = [];
  Glow.els.feedBox.replaceChildren();
};

Glow.renderFeedEmptyState = message => {
  if (Glow.els.feedBox.children.length) return;

  const state = document.createElement("div");
  state.className = "empty-state";

  const card = document.createElement("div");
  card.className = "empty-card";
  card.textContent = message;

  state.append(card);
  Glow.els.feedBox.append(state);
};

Glow.openFeedRoom = async slug => {
  const room = Glow.state.rooms.find(item => item.slug === slug);

  if (!room) {
    Glow.showToast("This room is no longer available.", "error");
    return;
  }

  Glow.state.activeDm = null;
  Glow.state.activeChannel = null;
  Glow.state.activeRoom = room;
  Glow.state.activeView = "room";

  Glow.els.roomSelect.value = room.slug;

  Glow.updateViewUI();
  await Glow.loadMessages();
  Glow.pingPresence?.();
  Glow.refreshPresence?.();
  Glow.schedulePoll();
};

Glow.openFeedEntry = async entry => {
  if (
    entry.team_slug &&
    entry.channel_slug &&
    typeof Glow.loadChannelsForTeam === "function"
  ) {
    let team = Glow.state.teams?.find(item => item.slug === entry.team_slug);

    if (!team && typeof Glow.loadTeamsForAdapter === "function") {
      try {
        await Glow.loadTeamsForAdapter();
        team = Glow.state.teams?.find(item => item.slug === entry.team_slug);
      } catch (_) {
        team = null;
      }
    }

    if (team) {
      Glow.state.activeTeam = team;
      Glow.state.activeDm = null;

      if (Glow.els.teamSelect) {
        Glow.els.teamSelect.value = team.slug;
      }

      try {
        await Glow.loadChannelsForTeam(team.slug, entry.channel_slug);

        if (Glow.state.activeChannel) {
          Glow.state.activeView = "channel";
          Glow.updateViewUI();
          await Glow.loadChannelMessages?.();
          Glow.pollTyping?.();
          Glow.pingPresence?.();
          Glow.refreshPresence?.();
          Glow.schedulePoll();
          return;
        }
      } catch (error) {
        Glow.showToast(error.message || "Could not open this channel.", "error");
        return;
      }
    }
  }

  if (entry.room_slug) {
    await Glow.openFeedRoom(entry.room_slug);
    return;
  }

  Glow.showToast("This conversation is no longer available.", "error");
};

Glow.feedAttachmentSummary = entry => {
  const attachments = Array.isArray(entry.attachments)
    ? entry.attachments
    : entry.attachment
      ? [entry.attachment]
      : [];

  if (!attachments.length) return "";

  if (attachments.length > 1) {
    return `${attachments.length} attachments`;
  }

  const item = attachments[0];
  const mime = String(item?.mime_type || "").toLowerCase();

  if (mime.startsWith("image/")) return "image attachment";
  if (mime.startsWith("audio/")) return "audio attachment";
  if (mime.startsWith("video/")) return "video attachment";
  return "file attachment";
};

Glow.buildFeedReactions = entry => {
  const reactions = Array.isArray(entry.reactions) ? entry.reactions : [];
  if (!reactions.length) return null;

  const row = document.createElement("div");
  row.className = "feed-entry-reactions compact";

  for (const reaction of reactions.slice(0, 6)) {
    const chip = document.createElement("button");
    chip.className = "reaction-chip";
    chip.type = "button";
    chip.textContent = `${reaction.emoji} ${reaction.count}`;

    if (reaction.reacted) {
      chip.classList.add("active");
    }

    chip.addEventListener("click", async () => {
      try {
        if (reaction.reacted) {
          await Glow.apiRemoveReaction(entry.id, reaction.emoji);
        } else {
          await Glow.apiAddReaction(entry.id, reaction.emoji);
        }

        await Glow.loadFeed();
      } catch (error) {
        Glow.showToast(error.message || "Could not update reaction.", "error");
      }
    });

    row.append(chip);
  }

  return row;
};

Glow.buildFeedEntry = entry => {
  const row = document.createElement("article");
  row.className = "feed-entry timeline-row";

  if (entry.is_mention) {
    row.classList.add("mention");
  }

  row.dataset.messageId = String(entry.id);

  if (entry.room_slug) row.dataset.roomSlug = entry.room_slug;
  if (entry.team_slug) row.dataset.teamSlug = entry.team_slug;
  if (entry.channel_slug) row.dataset.channelSlug = entry.channel_slug;

  const top = document.createElement("div");
  top.className = "feed-entry-top";

  const context = document.createElement("button");
  context.className = "feed-room-link";
  context.type = "button";

  if (entry.team_name && entry.channel_name) {
    context.textContent = `${entry.team_name} · # ${entry.channel_name}`;
  } else {
    context.textContent =
      `${entry.room_visibility === "private" ? "(private) " : "# "}${entry.room_name || "channel"}`;
  }

  context.addEventListener("click", () => {
    Glow.openFeedEntry(entry);
  });

  const time = document.createElement("time");
  time.className = "feed-entry-time";
  time.dateTime = entry.created_at;
  time.textContent = Glow.relativeTime(entry.created_at);
  time.title = new Date(entry.created_at).toLocaleString();

  top.append(context, time);

  const author = document.createElement("button");
  author.className = "feed-entry-author profile-link";
  author.type = "button";
  author.textContent = entry.username;
  Glow.applyUserColor(author, entry);
  author.addEventListener("click", () => {
    Glow.openProfile?.(entry.username);
  });

  const body = document.createElement("div");
  body.className = "feed-entry-body clamp-2";
  body.textContent = entry.text || "";

  const footer = document.createElement("div");
  footer.className = "feed-entry-footer";

  const meta = document.createElement("div");
  meta.className = "feed-entry-meta";

  const attachmentSummary = Glow.feedAttachmentSummary(entry);
  if (attachmentSummary) {
    const attachmentButton = document.createElement("button");
    attachmentButton.className = "small-button feed-attachment-summary";
    attachmentButton.type = "button";
    attachmentButton.textContent = attachmentSummary;
    attachmentButton.addEventListener("click", () => {
      Glow.openFeedEntry(entry);
    });
    meta.append(attachmentButton);
  }

  const reactions = Glow.buildFeedReactions(entry);
  if (reactions) {
    meta.append(reactions);
  }

  const openButton = document.createElement("button");
  openButton.className = "small-button feed-open-room";
  openButton.type = "button";
  openButton.textContent = "Open";
  openButton.addEventListener("click", () => {
    Glow.openFeedEntry(entry);
  });

  footer.append(meta, openButton);

  row.addEventListener("dblclick", () => {
    Glow.openFeedEntry(entry);
  });

  row.addEventListener("click", event => {
    if (
      event.target instanceof HTMLElement &&
      (event.target.closest("button") || event.target.closest("a"))
    ) {
      return;
    }
    Glow.openFeedEntry(entry);
  });

  row.append(top, author, body, footer);

  return row;
};

Glow.appendFeedEntries = (entries, forceScroll = false) => {
  if (!Array.isArray(entries) || !entries.length) {
    if (!Glow.state.feedKnownMessageIds.size) {
      Glow.renderFeedEmptyState(
        Glow.state.currentUser
          ? "No activity in your accessible rooms yet."
          : "Sign in or create an account to see your personalized activity feed."
      );
    }
    return;
  }

  const nearBottom =
    Glow.els.feedBox.scrollHeight -
      Glow.els.feedBox.scrollTop -
      Glow.els.feedBox.clientHeight < 100;

  const fragment = document.createDocumentFragment();

  for (const entry of entries) {
    const id = Number(entry.id);

    if (!id || Glow.state.feedKnownMessageIds.has(id)) {
      continue;
    }

    const previous = Glow.state.feedEntries.at(-1);

    const dateChanged =
      !previous ||
      Glow.dateKey(previous.created_at) !== Glow.dateKey(entry.created_at);

    if (dateChanged) {
      const separator = document.createElement("div");
      separator.className = "date-separator";
      separator.dataset.dateKey = Glow.dateKey(entry.created_at);

      const label = document.createElement("span");
      label.textContent = Glow.formatDateLabel(entry.created_at);

      separator.append(label);
      fragment.append(separator);
    }

    Glow.state.feedKnownMessageIds.add(id);
    Glow.state.feedLastSeenId = Math.max(Glow.state.feedLastSeenId, id);
    Glow.state.feedEntries.push(entry);
    fragment.append(Glow.buildFeedEntry(entry));
  }

  if (!fragment.childNodes.length) return;

  Glow.els.feedBox.querySelector(".empty-state")?.remove();
  Glow.els.feedBox.append(fragment);

  if (forceScroll || nearBottom) {
    Glow.els.feedBox.scrollTop = Glow.els.feedBox.scrollHeight;
  }
};

Glow.loadFeed = async () => {
  const requestId = ++Glow.state.feedRequestId;
  Glow.els.feedBox.setAttribute("aria-busy", "true");

  try {
    const data = await Glow.apiRequest("/api/feed");

    if (requestId !== Glow.state.feedRequestId || Glow.state.activeView !== "feed") {
      return;
    }

    Glow.clearFeed();
    Glow.appendFeedEntries(data.entries || [], true);
    Glow.state.feedLastSeenId = Number(data.latest_id) || 0;

    if (!(data.entries || []).length) {
      Glow.renderFeedEmptyState(
        Glow.state.currentUser
          ? "No activity in your accessible rooms yet."
          : "Sign in or create an account to see your personalized activity feed."
      );
    }
  } catch (error) {
    if (requestId !== Glow.state.feedRequestId) {
      return;
    }

    Glow.clearFeed();
    Glow.renderFeedEmptyState(error.message || "Could not load activity feed.");
    Glow.showToast(error.message || "Could not load activity feed.", "error");
  } finally {
    if (requestId === Glow.state.feedRequestId) {
      Glow.els.feedBox.setAttribute("aria-busy", "false");
    }
  }
};

Glow.pollFeed = async () => {
  if (
    Glow.state.feedPollInFlight ||
    Glow.state.activeView !== "feed" ||
    document.hidden
  ) {
    return;
  }

  Glow.state.feedPollInFlight = true;

  try {
    const data = await Glow.apiRequest(
      `/api/feed?after_id=${encodeURIComponent(Glow.state.feedLastSeenId)}`
    );

    if (Glow.state.activeView !== "feed") {
      return;
    }

    Glow.appendFeedEntries(data.entries || [], false);
    Glow.state.feedLastSeenId = Math.max(
      Glow.state.feedLastSeenId,
      Number(data.latest_id) || 0
    );
  } catch (error) {
    if (error.status === 404) {
      console.warn("Feed API is unavailable. Deploy the /api/feed backend route.");
      return;
    }

    if (
      error.status !== 401 &&
      error.code !== "blacklisted" &&
      error.code !== "network"
    ) {
      console.error("Feed polling failed:", error);
    }
  } finally {
    Glow.state.feedPollInFlight = false;
  }
};

Glow.openFeed = async () => {
  Glow.state.activeDm = null;
  Glow.state.activeView = "feed";
  Glow.updateViewUI();
  await Glow.loadFeed();
  Glow.schedulePoll();
};