// static/js/10-reactions.js
"use strict";

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

Glow.reactions = Glow.reactions || {
  enabled: true,
  emojis: [
    "👍", "👎", "❤️", "🔥", "😂", "😄", "🙂", "😭",
    "👏", "🙌", "🎉", "✨", "💯", "✅", "👀", "🤔",
    "🙏", "💡", "⭐", "🚀", "😮", "😢", "😡", "👋"
  ],
  activeMessage: null,
  selectedIndex: 0
};

Glow.submitCustomReaction = async () => {
  const message = Glow.reactions.activeMessage;
  const input = Glow.els.reactionCustomInput;
  if (!message || !input) return;

  const emoji = input.value.trim();
  if (!emoji) return;

  try {
    const existing = (message.reactions || []).find(item => item.emoji === emoji);

    if (existing?.reacted) {
      await Glow.apiRemoveReaction(message.id, emoji);
    } else {
      await Glow.apiAddReaction(message.id, emoji);
    }

    const data = await Glow.apiGetMessageReactions(message.id);
    message.reactions = data.reactions || [];
    Glow.updateMessageReactionsDom?.(message.id, message.reactions);

    Glow.renderReactionPopupUsers(message.reactions);
    input.value = "";

    if (Glow.state.activeView === "feed") {
      Glow.loadFeed?.();
    }
  } catch (error) {
    Glow.showToast(error.message || "Could not update reaction.", "error");
  }
};

Glow.highlightReactionSelection = () => {
  const grid = Glow.els.reactionPopupGrid;
  if (!grid) return;

  const buttons = [...grid.querySelectorAll(".reaction-popup-button")];
  buttons.forEach((button, index) => {
    button.classList.toggle("active", index === Glow.reactions.selectedIndex);
  });
};

Glow.activateReactionAtIndex = async index => {
  const message = Glow.reactions.activeMessage;
  const emoji = Glow.reactions.emojis[index];
  if (!message || !emoji) return;

  try {
    const existing = (message.reactions || []).find(item => item.emoji === emoji);

    if (existing?.reacted) {
      await Glow.apiRemoveReaction(message.id, emoji);
    } else {
      await Glow.apiAddReaction(message.id, emoji);
    }

    const data = await Glow.apiGetMessageReactions(message.id);
    message.reactions = data.reactions || [];
    Glow.updateMessageReactionsDom?.(message.id, message.reactions);
    Glow.renderReactionPopupUsers(message.reactions);
    Glow.highlightReactionSelection();

    if (Glow.state.activeView === "feed") {
      Glow.loadFeed?.();
    }
  } catch (error) {
    Glow.showToast(error.message || "Could not update reaction.", "error");
  }
};

Glow.openReactionPopup = async message => {
  Glow.reactions.activeMessage = message;
  Glow.reactions.selectedIndex = 0;

  const grid = Glow.els.reactionPopupGrid;
  const list = Glow.els.reactionPopupList;
  const customInput = Glow.els.reactionCustomInput;

  if (!grid || !list) return;

  grid.replaceChildren();
  list.replaceChildren();

  Glow.reactions.emojis.forEach((emoji, index) => {
    const button = document.createElement("button");
    button.className = "reaction-popup-button";
    button.type = "button";
    button.textContent = emoji;
    button.setAttribute("aria-label", `React with ${emoji}`);

    button.addEventListener("click", async () => {
      Glow.reactions.selectedIndex = index;
      Glow.highlightReactionSelection();
      await Glow.activateReactionAtIndex(index);
    });

    grid.append(button);
  });

  try {
    const data = await Glow.apiGetMessageReactions(message.id);
    message.reactions = data.reactions || [];
  } catch (_) {
    message.reactions = [];
  }

  if (customInput) {
    customInput.value = "";
  }

  Glow.renderReactionPopupUsers(message.reactions || []);
  Glow.els.reactionPopupOverlay?.classList.remove("hidden");
  Glow.highlightReactionSelection();

  setTimeout(() => {
    const first = grid.querySelector(".reaction-popup-button");
    first?.focus();
  }, 0);
};

Glow.moveReactionSelection = delta => {
  const total = Glow.reactions.emojis.length;
  if (!total) return;
  Glow.reactions.selectedIndex =
    (Glow.reactions.selectedIndex + delta + total) % total;
  Glow.highlightReactionSelection();

  const grid = Glow.els.reactionPopupGrid;
  const selected = grid?.querySelectorAll(".reaction-popup-button")[Glow.reactions.selectedIndex];
  selected?.scrollIntoView({ block: "nearest", inline: "nearest" });
};

Glow.renderReactionPopupUsers = reactions => {
  const list = Glow.els.reactionPopupList;
  if (!list) return;

  list.replaceChildren();

  if (!reactions.length) {
    const empty = document.createElement("div");
    empty.className = "reaction-popup-user";
    empty.textContent = "No reactions yet.";
    list.append(empty);
    return;
  }

  for (const reaction of reactions) {
    const section = document.createElement("div");
    section.className = "reaction-popup-section";

    const title = document.createElement("div");
    title.className = "reaction-popup-user";
    title.innerHTML = `<strong>${reaction.emoji} ${reaction.count}</strong>`;
    section.append(title);

    const names = document.createElement("div");
    names.className = "reaction-popup-user";
    names.textContent = (reaction.users || [])
      .map(user => user.username)
      .join(", ");
    section.append(names);

    list.append(section);
  }
};

Glow.closeReactionPopup = () => {
  Glow.reactions.activeMessage = null;
  Glow.reactions.selectedIndex = 0;
  if (Glow.els.reactionCustomInput) {
    Glow.els.reactionCustomInput.value = "";
  }
  Glow.els.reactionPopupOverlay?.classList.add("hidden");
};

Glow.els.reactionCustomButton?.addEventListener("click", () => {
  Glow.submitCustomReaction?.();
});

Glow.els.reactionCustomInput?.addEventListener("keydown", event => {
  if (event.key === "Enter") {
    event.preventDefault();
    Glow.submitCustomReaction?.();
  }
  if (event.key === "Escape") {
    event.preventDefault();
    Glow.closeReactionPopup?.();
  }
});

document.addEventListener("keydown", async event => {
  if (Glow.els.reactionPopupOverlay?.classList.contains("hidden")) return;

  if (event.key === "ArrowRight") {
    event.preventDefault();
    Glow.moveReactionSelection(1);
    return;
  }

  if (event.key === "ArrowLeft") {
    event.preventDefault();
    Glow.moveReactionSelection(-1);
    return;
  }

  if (event.key === "ArrowDown") {
    event.preventDefault();
    Glow.moveReactionSelection(4);
    return;
  }

  if (event.key === "ArrowUp") {
    event.preventDefault();
    Glow.moveReactionSelection(-4);
    return;
  }

  if (event.key === "Enter") {
    const active = document.activeElement;
    if (active === Glow.els.reactionCustomInput) return;
    event.preventDefault();
    await Glow.activateReactionAtIndex(Glow.reactions.selectedIndex);
    return;
  }

  if (event.key === "Escape") {
    event.preventDefault();
    Glow.closeReactionPopup?.();
  }
});