/**
 * Button interaction handlers and the ticket-creation modal submit.
 *
 * The dispatcher pattern: handleButton splits buttons into two tables —
 * FREE_BUTTON_HANDLERS for buttons that don't need a ticket (open-ticket
 * panel, tag-delete cancel) and TICKET_BUTTON_HANDLERS for buttons fired
 * inside a ticket channel. The dispatcher does one ticket lookup before
 * delegating to a TICKET_BUTTON_HANDLERS entry. To find a button's
 * implementation, search for handle<Name>Button (or handleTagDelete*).
 */
const {
  ChannelType,
  ActionRowBuilder,
  ButtonBuilder,
  ButtonStyle,
  AttachmentBuilder,
  EmbedBuilder,
  MessageFlags,
  PermissionFlagsBits,
  ModalBuilder,
  TextInputBuilder,
  TextInputStyle
} = require('discord.js');
const { mongoose } = require('../db-connection');
const { CONFIG } = require('../config');
const { makeTicketName, resolveCreatorNickname, getOrCreateTicketCategory, cleanupEmptyOverflowCategory, checkTicketCreationRateLimit, toDiscordSafeName } = require('../services/tickets');
const { sendTicketClosedEmail } = require('../services/gmail');
const { getTicketActionRow } = require('../utils/ticketComponents');
const { sanitizeEmbedText, truncateEmbedDescription } = require('../utils');
const { enqueueRename, enqueueSend } = require('../services/channelQueue');
const { runEscalation, runDeescalation } = require('./commands');
const { pendingCloses } = require('./pendingCloses');
const { addMemberToStaffThread, createStaffThread } = require('../services/staffThread');
const { pinMessage } = require('../services/pinMessage');
const { logError, logTicketEvent } = require('../services/debugLog');
const { findTicketForChannel, runDeferred } = require('./sharedHelpers');

const Ticket = mongoose.model('Ticket');
const Transcript = mongoose.model('Transcript');
const Tag = mongoose.model('Tag');

// ============================================================
// Free-standing button handlers (no ticket lookup)
// ============================================================

/**
 * Open-ticket panel button (any of `open_ticket`, `open_ticket_thread`,
 * `open_ticket_channel`). Shows the ticket-creation modal.
 */
async function handleOpenTicketModal(interaction) {
  const modalCustomId = interaction.customId === 'open_ticket'
    ? 'ticket_modal'
    : interaction.customId === 'open_ticket_thread'
      ? 'ticket_modal_thread'
      : 'ticket_modal_channel';
  return interaction.showModal(buildOpenTicketModal(modalCustomId));
}

function buildOpenTicketModal(modalCustomId) {
  const modal = new ModalBuilder()
    .setCustomId(modalCustomId)
    .setTitle('Please Enter Your Information');

  const emailInput = new TextInputBuilder()
    .setCustomId('ticket_email')
    .setLabel('Account Email:')
    .setStyle(TextInputStyle.Short)
    .setPlaceholder('Example: broccoli@indifferentbroccoli.com')
    .setRequired(true)
    .setMaxLength(100);

  const gameInput = new TextInputBuilder()
    .setCustomId('ticket_game')
    .setLabel('What game do you need help with?')
    .setStyle(TextInputStyle.Short)
    .setPlaceholder('Example: Project Zomboid, Minecraft')
    .setRequired(true)
    .setMaxLength(100);

  const descriptionInput = new TextInputBuilder()
    .setCustomId('ticket_description')
    .setLabel('What do you need help with?')
    .setStyle(TextInputStyle.Paragraph)
    .setPlaceholder("Example: I can't connect to my server.")
    .setRequired(true)
    .setMaxLength(1000);

  modal.addComponents(
    new ActionRowBuilder().addComponents(emailInput),
    new ActionRowBuilder().addComponents(gameInput),
    new ActionRowBuilder().addComponents(descriptionInput)
  );

  return modal;
}

async function handleTagDeleteCancel(interaction) {
  return interaction.update({ content: 'Tag deletion cancelled.', components: [] });
}

async function handleTagDeleteConfirm(interaction) {
  const tagName = interaction.customId.slice('confirm_delete_tag::'.length);

  try {
    const result = await Tag.deleteOne({ name: tagName });
    if (result.deletedCount === 0) {
      await interaction.update({ content: `❌ Tag "${tagName}" not found.`, components: [] });
    } else {
      await interaction.update({ content: `✅ Tag "${tagName}" deleted successfully.`, components: [] });
    }
  } catch (err) {
    logError('tag-delete-confirm', err, interaction).catch(() => {});
    await interaction.update({ content: '❌ Failed to delete tag.', components: [] });
  }
}

// ============================================================
// Ticket-scoped button handlers
// ============================================================

/** Toggle claim/unclaim on the current ticket and rewrite the action row. */
async function handleClaimButton(interaction, ticket) {
  const freshTicket = await Ticket.findOne({ gmailThreadId: ticket.gmailThreadId }).lean();
  if (!freshTicket) {
    return interaction.reply({ content: 'Ticket data missing.', flags: MessageFlags.Ephemeral });
  }

  const isClaimed = !!freshTicket.claimedBy;
  const claimerLabel = interaction.member?.displayName || interaction.user.username;
  const guild = interaction.guild;
  const isClaimedByMe = freshTicket.claimedBy === claimerLabel;

  const [row0] = interaction.message.components;
  if (!row0) {
    return interaction.reply({ content: 'No components to update.', flags: MessageFlags.Ephemeral });
  }

  const row = ActionRowBuilder.from(row0);
  const [btnClose, btnClaim] = row.components;
  if (!btnClose || !btnClaim) {
    return interaction.reply({ content: 'Buttons missing.', flags: MessageFlags.Ephemeral });
  }

  if (isClaimed && !isClaimedByMe && !CONFIG.ALLOW_CLAIM_OVERWRITE) {
    return interaction.reply({
      content: `This ticket is already claimed by **${freshTicket.claimedBy}**.`,
      flags: MessageFlags.Ephemeral
    });
  }

  const isClaiming = !isClaimed || (isClaimed && !isClaimedByMe && CONFIG.ALLOW_CLAIM_OVERWRITE);
  if (isClaiming) {
    await applyClaim(interaction, freshTicket, row, btnClose, btnClaim, claimerLabel, guild);
  } else {
    await applyUnclaim(interaction, freshTicket, row, btnClose, btnClaim, claimerLabel, guild);
  }
}

async function applyClaim(interaction, freshTicket, row, btnClose, btnClaim, claimerLabel, guild) {
  await Ticket.updateOne(
    { gmailThreadId: freshTicket.gmailThreadId },
    { $set: { claimedBy: claimerLabel, claimerId: interaction.user.id } }
  );
  freshTicket.claimedBy = claimerLabel;
  freshTicket.claimerId = interaction.user.id;

  const claimerEmoji = CONFIG.STAFF_EMOJIS[interaction.user.id] || CONFIG.CLAIMER_EMOJI_FALLBACK;
  const creatorNickname = await resolveCreatorNickname(guild, freshTicket);
  const state = freshTicket.escalated ? 'escalated-claimed' : 'claimed';
  enqueueRename(interaction.channel, makeTicketName(state, freshTicket, creatorNickname, claimerEmoji))
    .catch(err => logError('rename', err).catch(() => {}));

  btnClose
    .setCustomId('close_ticket')
    .setLabel(CONFIG.BUTTON_LABEL_CLOSE)
    .setEmoji(CONFIG.BUTTON_EMOJI_CLOSE)
    .setStyle(ButtonStyle.Secondary)
    .setDisabled(false);

  btnClaim
    .setCustomId('claim_ticket')
    .setEmoji(CONFIG.BUTTON_EMOJI_UNCLAIM)
    .setStyle(ButtonStyle.Secondary)
    .setDisabled(false)
    .setLabel(`Unclaim (${claimerLabel})`);

  await interaction.update({ components: [row] });

  const claimText = CONFIG.TICKET_CLAIMED_MESSAGE
    .replace(/\{staff_mention\}/g, interaction.user.toString())
    .replace(/\{staff_name\}/g, interaction.member?.displayName || interaction.user.username);
  const claimEmbed = new EmbedBuilder()
    .setTitle('✅ Ticket Claimed')
    .setDescription(claimText)
    .setColor(CONFIG.EMBED_COLOR_CLAIMED)
    .setFooter({ text: `Claimed by ${claimerLabel}` });
  await interaction.followUp({ embeds: [claimEmbed] });

  await addMemberToStaffThread(interaction.channel, interaction.user.id).catch(() => {});
}

async function applyUnclaim(interaction, freshTicket, row, btnClose, btnClaim, claimerLabel, guild) {
  await Ticket.updateOne(
    { gmailThreadId: freshTicket.gmailThreadId },
    { $set: { claimedBy: null, claimerId: null } }
  );
  freshTicket.claimedBy = null;
  freshTicket.claimerId = null;

  const creatorNickname = await resolveCreatorNickname(guild, freshTicket);
  const state = (freshTicket.escalationTier ?? 0) >= 1 ? 'escalated' : 'unclaimed';
  enqueueRename(interaction.channel, makeTicketName(state, freshTicket, creatorNickname))
    .catch(err => logError('rename', err).catch(() => {}));

  btnClose
    .setCustomId('close_ticket')
    .setLabel(CONFIG.BUTTON_LABEL_CLOSE)
    .setEmoji(CONFIG.BUTTON_EMOJI_CLOSE)
    .setStyle(ButtonStyle.Secondary)
    .setDisabled(false);

  btnClaim
    .setCustomId('claim_ticket')
    .setEmoji(CONFIG.BUTTON_EMOJI_CLAIM)
    .setStyle(ButtonStyle.Secondary)
    .setDisabled(false)
    .setLabel(CONFIG.BUTTON_LABEL_CLAIM);

  await interaction.update({ components: [row] });

  const unclaimText = CONFIG.TICKET_UNCLAIMED_MESSAGE
    .replace(/\{staff_mention\}/g, interaction.user.toString())
    .replace(/\{staff_name\}/g, interaction.member?.displayName || interaction.user.username);
  const unclaimEmbed = new EmbedBuilder()
    .setTitle('🔓 Ticket Unclaimed')
    .setDescription(unclaimText)
    .setColor(0x808080)
    .setFooter({ text: `Unclaimed by ${claimerLabel}` });
  await interaction.followUp({ embeds: [unclaimEmbed] });
}

/**
 * First-stage Close button: prompt the staff member with confirm/cancel
 * variants. Email tickets get a "Confirm Close With Email" / "Without Email"
 * choice; Discord-only tickets get a single "Confirm Close".
 */
async function handleCloseButton(interaction, ticket) {
  const isEmailTicket = ticket.gmailThreadId && !ticket.gmailThreadId.startsWith('discord-');
  const buttons = [];

  if (isEmailTicket) {
    buttons.push(
      new ButtonBuilder().setCustomId('confirm_close_with_email').setLabel('Confirm Close With Email').setStyle(ButtonStyle.Danger),
      new ButtonBuilder().setCustomId('confirm_close_no_email').setLabel('Confirm Close Without Email').setStyle(ButtonStyle.Danger)
    );
  } else {
    buttons.push(
      new ButtonBuilder().setCustomId('confirm_close').setLabel('Confirm Close').setStyle(ButtonStyle.Danger)
    );
  }
  buttons.push(
    new ButtonBuilder().setCustomId('cancel_close').setLabel('Cancel').setStyle(ButtonStyle.Secondary)
  );

  return interaction.reply({
    content: 'Are you sure you want to close this ticket?',
    components: [new ActionRowBuilder().addComponents(...buttons)]
  });
}

/**
 * Confirm-close button (any of `confirm_close`, `confirm_close_with_email`,
 * `confirm_close_no_email`). Starts a countdown; staff can hit `cancel_close`
 * to abort. After the timer elapses, runFinalClose() does the archive+delete.
 */
async function handleConfirmCloseRequest(interaction, ticket) {
  const sendEmail = interaction.customId !== 'confirm_close_no_email';
  const timerSeconds = CONFIG.FORCE_CLOSE_TIMER;

  if (pendingCloses.has(interaction.channel.id)) {
    return interaction.reply({ content: 'A close is already pending for this ticket.', flags: MessageFlags.Ephemeral });
  }

  const cancelRow = new ActionRowBuilder().addComponents(
    new ButtonBuilder().setCustomId('cancel_close').setLabel('Cancel Close').setStyle(ButtonStyle.Secondary)
  );
  await interaction.update({ content: `Closing ticket in ${timerSeconds} seconds.`, components: [cancelRow] });

  const channelId = interaction.channel.id;
  const channelName = interaction.channel.name;
  const userTag = interaction.user.tag;

  // Lazy require — broccolini-discord re-exports trackTimeout and we'd otherwise cycle.
  const { trackTimeout } = require('../broccolini-discord');
  const timerId = trackTimeout(setTimeout(async () => {
    const pending = pendingCloses.get(channelId);
    pendingCloses.delete(channelId);
    const freshTicket = await Ticket.findOne({ discordThreadId: channelId }).lean();
    if (!freshTicket || freshTicket.status === 'closed') return;

    logTicketEvent('Force-close timer fired', [
      { name: 'Ticket', value: channelName || channelId },
      { name: 'Set by', value: userTag },
      { name: 'Duration', value: `${timerSeconds}s` }
    ]).catch(() => {});

    const effectiveSendEmail = pending?.sendEmail ?? true;
    await runFinalClose(interaction, freshTicket, effectiveSendEmail);
  }, timerSeconds * 1000));

  pendingCloses.set(channelId, { timeout: timerId, userId: interaction.user.id, username: userTag, sendEmail });
}

async function handleCancelCloseRequest(interaction) {
  const pending = pendingCloses.get(interaction.channel.id);
  if (pending) {
    clearTimeout(pending.timeout);
    pendingCloses.delete(interaction.channel.id);
  }
  return interaction.update({ content: 'Close cancelled.', components: [] });
}

/**
 * Escalate button: shows a tier 2 / tier 3 picker. The picker buttons are
 * `escalate_to_tier2` / `escalate_to_tier3`, handled by handleEscalateButton.
 */
async function handleEscalatePrompt(interaction, ticket) {
  const currentTier = ticket.escalationTier ?? (ticket.escalated ? 1 : 0);
  if (currentTier >= 2) {
    return interaction.reply({ content: 'This ticket is already at tier 3 support.', flags: MessageFlags.Ephemeral });
  }

  const buttons = [];
  if (currentTier < 1) {
    buttons.push(new ButtonBuilder().setCustomId('escalate_to_tier2').setLabel('To Tier 2').setStyle(ButtonStyle.Secondary));
  }
  if (currentTier < 2) {
    buttons.push(new ButtonBuilder().setCustomId('escalate_to_tier3').setLabel('To Tier 3').setStyle(ButtonStyle.Secondary));
  }

  return interaction.reply({
    content: 'Escalate to which tier?',
    components: [new ActionRowBuilder().addComponents(buttons)],
    flags: MessageFlags.Ephemeral
  });
}

/**
 * Tier-pick button (`escalate_to_tier2` or `escalate_to_tier3`). Validates
 * the target tier, then delegates to runEscalation() in handlers/commands.js.
 */
async function handleEscalateButton(interaction, ticket) {
  const tier = interaction.customId === 'escalate_to_tier3' ? 2 : 1;
  const currentTier = ticket.escalationTier ?? (ticket.escalated ? 1 : 0);

  if (currentTier >= tier) {
    return interaction.reply({ content: `This ticket is already at tier ${tier + 1}.`, flags: MessageFlags.Ephemeral });
  }

  const isDiscordTicket = ticket.gmailThreadId.startsWith('discord-');
  const categoryId = tier === 1
    ? (isDiscordTicket ? CONFIG.DISCORD_ESCALATED2_CHANNEL_ID : CONFIG.EMAIL_ESCALATED2_CHANNEL_ID)
    : (isDiscordTicket ? CONFIG.DISCORD_ESCALATED3_CHANNEL_ID : CONFIG.EMAIL_ESCALATED3_CHANNEL_ID);

  if (!categoryId && !interaction.channel.isThread()) {
    return interaction.reply({
      content: `Tier ${tier + 1} (ESCALATED${tier + 1}) is not configured for this ticket type.`,
      flags: MessageFlags.Ephemeral
    });
  }

  await runDeferred(interaction, 'escalate', () => runEscalation(interaction, ticket, tier, null));
}

async function handleDeescalateButton(interaction, ticket) {
  const currentTier = ticket.escalationTier ?? (ticket.escalated ? 1 : 0);
  if (currentTier === 0) {
    return interaction.reply({ content: 'This ticket is not escalated.', flags: MessageFlags.Ephemeral });
  }

  await runDeferred(interaction, 'deescalate',
    () => runDeescalation(interaction, ticket),
    { flags: MessageFlags.Ephemeral }
  );
}

// ============================================================
// Final close: archive → transcript → delete
// ============================================================

/**
 * Runs after the force-close countdown elapses (or the staff member
 * confirmed without a countdown). Archives the channel into a transcript,
 * posts to the transcript channel and optionally DMs the creator, sends the
 * customer closure email (email tickets only), then deletes the channel.
 */
async function runFinalClose(interaction, ticket, sendEmail = true) {
  const closedAt = new Date();

  try {
    await interaction.update({ content: 'Archiving and closing...', components: [] });
  } catch {
    // Already acknowledged – fall back to editReply
    await interaction.editReply({ content: 'Archiving and closing...', components: [] }).catch(() => {});
  }

  try {
    const channelName = interaction.channel.name;
    const transcriptText = await buildTranscriptText(interaction.channel, ticket);
    const file = new AttachmentBuilder(Buffer.from(transcriptText), {
      name: `transcript-${channelName}.txt`
    });

    const openedStr = formatDateForTranscript(ticket.createdAt);
    const closedStr = formatDateForTranscript(closedAt);
    const transcriptContent = renderTranscriptHeader(channelName, ticket.senderEmail, openedStr, closedStr);

    await enqueueSend(interaction.channel, CONFIG.DISCORD_CLOSE_MESSAGE);

    let transcriptMsg = null;
    const transcriptChan = await interaction.client.channels
      .fetch(CONFIG.TRANSCRIPT_CHANNEL_ID)
      .catch(() => null);
    if (transcriptChan) {
      transcriptMsg = await enqueueSend(transcriptChan, {
        content: transcriptContent,
        files: [file]
      });
    }

    // Optionally DM the transcript to the ticket creator. Many users have
    // server-member DMs disabled; gated to avoid 50007 noise. Discord-origin
    // tickets only.
    if (CONFIG.TRANSCRIPT_DM_TO_CREATOR && ticket.gmailThreadId?.startsWith('discord-')) {
      await dmTranscriptToCreator(interaction.client, ticket, channelName, transcriptText, openedStr, closedStr);
    }

    await postCloseLogEntry(interaction, ticket, channelName);

    const closerDisplayName = interaction.member?.displayName || interaction.user.username;
    if (sendEmail && !ticket.gmailThreadId?.startsWith('discord-')) {
      await sendTicketClosedEmail(ticket, closerDisplayName, interaction.user.id);
    }

    // $unset welcomeMessageId so a future reopen on this thread doesn't carry
    // a stale message ID pointing into the now-deleted channel.
    await Ticket.updateOne(
      { gmailThreadId: ticket.gmailThreadId },
      { $set: { discordThreadId: null, status: 'closed' }, $unset: { welcomeMessageId: '' } }
    );

    if (transcriptMsg?.id) {
      await Transcript.create({
        gmailThreadId: ticket.gmailThreadId,
        transcriptMessageId: transcriptMsg.id,
        createdAt: new Date()
      });
    }

    const parentCatId = ticket.parentCategoryId;
    const guildRef = interaction.guild;

    // Lazy require — same cycle reason as in handleConfirmCloseRequest above.
    const { trackTimeout } = require('../broccolini-discord');
    trackTimeout(setTimeout(() => interaction.channel.delete().catch(() => {}), 5000));
    trackTimeout(setTimeout(() => {
      if (parentCatId && guildRef) {
        cleanupEmptyOverflowCategory(guildRef, parentCatId, CONFIG.TICKET_CATEGORY_NAME).catch(() => {});
      }
    }, 6000));
  } catch (e) {
    console.error('Close ticket error:', e);
  }
}

/** Render the last 100 messages of a channel as a plaintext transcript. */
async function buildTranscriptText(channel, ticket) {
  const messages = await channel.messages.fetch({ limit: 100 });
  return `TRANSCRIPT: ${ticket.subject}\nUser: ${ticket.senderEmail}\n---\n` +
    messages
      .reverse()
      .map(m => `[${m.createdAt.toLocaleString()}] ${m.author.tag}: ${m.cleanContent}`)
      .join('\n');
}

function formatDateForTranscript(d) {
  return new Date(d).toLocaleString('en-US', {
    month: '2-digit', day: '2-digit', year: 'numeric',
    hour: '2-digit', minute: '2-digit', second: '2-digit',
    hour12: true, timeZoneName: 'short'
  });
}

function renderTranscriptHeader(channelName, senderEmail, openedStr, closedStr) {
  return CONFIG.DISCORD_TRANSCRIPT_MESSAGE
    .replace(/\{channel_name\}/g, channelName)
    .replace(/\{email\}/g, senderEmail || '')
    .replace(/\{date_opened\}/g, openedStr)
    .replace(/\{date_closed\}/g, closedStr)
    + `\n\nDate Opened: ${openedStr}\nDate Closed: ${closedStr}`;
}

async function dmTranscriptToCreator(client, ticket, channelName, transcriptText, openedStr, closedStr) {
  // Prefer ticket.creatorId (stored on creation). Fall back to legacy parsing for
  // pre-creatorId modal tickets only — split-pop returns the wrong value for
  // discord-msg-* tickets (it yields the message ID, not the user ID).
  const creatorId = ticket.creatorId
    || (ticket.gmailThreadId.startsWith('discord-msg-') ? null : ticket.gmailThreadId.split('-').pop());
  if (!creatorId) return;
  try {
    const creator = await client.users.fetch(creatorId);
    const dmFile = new AttachmentBuilder(Buffer.from(transcriptText), {
      name: `transcript-${channelName}.txt`
    });
    const dmContent = CONFIG.DISCORD_TRANSCRIPT_MESSAGE
      .replace(/\{channel_name\}/g, channelName)
      .replace(/\{email\}/g, ticket.senderEmail || '')
      .replace(/\{date_opened\}/g, openedStr)
      .replace(/\{date_closed\}/g, closedStr);
    await creator.send({ content: dmContent, files: [dmFile] });
  } catch (dmErr) {
    // 50007 = "Cannot send messages to this user" — user has DMs off. Expected; ignore.
    if (dmErr?.code !== 50007) {
      logError('transcript-dm', dmErr).catch(() => {});
    }
  }
}

async function postCloseLogEntry(interaction, ticket, channelName) {
  if (!CONFIG.LOGGING_CHANNEL_ID) return;
  const logChan = await interaction.client.channels.fetch(CONFIG.LOGGING_CHANNEL_ID).catch(() => null);
  if (!logChan) return;

  const closerMention = interaction.user.toString();
  const closerDisplayName = interaction.member?.displayName || interaction.user.username;

  let logMsg;
  if (ticket.gmailThreadId?.startsWith('discord-')) {
    const creatorId = ticket.creatorId
      || (ticket.gmailThreadId.startsWith('discord-msg-') ? null : ticket.gmailThreadId.split('-').pop());
    let creator = null;
    if (creatorId) {
      creator = await interaction.client.users.fetch(creatorId).catch(() => null);
    }
    logMsg = creator
      ? `Closed ${creator.toString()}'s **${channelName}** by ${closerMention} (${closerDisplayName})`
      : `Closed **${channelName}** by ${closerMention} (${closerDisplayName})`;
  } else {
    logMsg = `Closed **${channelName}** (${ticket.senderEmail}) by ${closerMention} (${closerDisplayName})`;
  }
  await enqueueSend(logChan, logMsg);
}

// ============================================================
// Ticket-creation modal submit (open-ticket panel → modal → ticket channel)
// ============================================================

async function handleTicketModal(interaction) {
  await interaction.deferReply({ flags: MessageFlags.Ephemeral });

  const email = interaction.fields.getTextInputValue('ticket_email').trim().toLowerCase();
  const game = interaction.fields.getTextInputValue('ticket_game').trim();
  const description = interaction.fields.getTextInputValue('ticket_description');
  const subject = game ? `[${game}] ${description.slice(0, 60)}` : description.slice(0, 80);
  const priority = CONFIG.PRIORITY_ENABLED ? CONFIG.DEFAULT_PRIORITY : 'normal';

  const rateLimit = checkTicketCreationRateLimit(interaction.user.id);
  if (!rateLimit.allowed) {
    const mins = Math.ceil((rateLimit.retryAfterMs || 0) / 60000);
    return interaction.editReply(`You can only create ${CONFIG.RATE_LIMIT_TICKETS_PER_USER} ticket(s) per ${CONFIG.RATE_LIMIT_WINDOW_MINUTES} minutes. Try again in ${mins} minute(s).`);
  }

  try {
    const guild = interaction.guild;
    const lastTicket = await Ticket.findOne().sort({ ticketNumber: -1 }).select('ticketNumber').lean();
    const ticketNumber = (lastTicket?.ticketNumber || 0) + 1;

    const creatorNickname = interaction.member?.displayName || interaction.user.username;
    const unclaimedName = toDiscordSafeName(`unclaimed-${creatorNickname}-${ticketNumber}`);

    let parentCategoryIdForTicket;
    try {
      parentCategoryIdForTicket = await getOrCreateTicketCategory(
        guild,
        CONFIG.DISCORD_TICKET_CATEGORY_ID,
        CONFIG.TICKET_CATEGORY_NAME
      );
    } catch (err) {
      console.error('getOrCreateTicketCategory (ticket modal):', err);
      return interaction.editReply('Discord ticket category could not be resolved. Contact an administrator.');
    }

    let channel;
    try {
      // Initial permissionOverwrites on guild.channels.create are safe-by-construction:
      // the channel doesn't exist yet, so there's no in-flight rename/send/move to race
      // against. Any *subsequent* mutation on this channel (add/remove user, move,
      // topic, rename) must go through services/channelQueue.js.
      channel = await guild.channels.create({
        name: unclaimedName,
        type: ChannelType.GuildText,
        parent: parentCategoryIdForTicket,
        permissionOverwrites: [
          { id: guild.id, deny: [PermissionFlagsBits.ViewChannel] },
          {
            id: interaction.user.id,
            allow: [PermissionFlagsBits.ViewChannel, PermissionFlagsBits.SendMessages, PermissionFlagsBits.ReadMessageHistory]
          },
          {
            id: CONFIG.ROLE_ID_TO_PING,
            allow: [PermissionFlagsBits.ViewChannel, PermissionFlagsBits.SendMessages, PermissionFlagsBits.ReadMessageHistory]
          }
        ]
      });
    } catch (err) {
      console.error('guild.channels.create (ticket modal):', err);
      return interaction.editReply('Failed to create ticket channel. Contact an administrator.');
    }

    const gmailThreadId = `discord-${Date.now()}-${interaction.user.id}`;
    const now = new Date();
    await Ticket.create({
      gmailThreadId,
      discordThreadId: channel.id,
      senderEmail: email,
      subject,
      game: game || null,
      createdAt: now,
      status: 'open',
      ticketNumber,
      priority,
      lastActivity: now,
      creatorId: interaction.user.id,
      parentCategoryId: parentCategoryIdForTicket
    });

    const welcomeMsg = await postTicketWelcomeEmbeds(channel, interaction, email, game, description);
    await createStaffThread(channel, interaction.client).catch(() => {});

    if (CONFIG.PIN_INITIAL_MESSAGE_ENABLED && welcomeMsg) {
      await pinMessage(welcomeMsg, interaction.client).catch(() => {});
    }

    await interaction.deleteReply().catch(() => {});

    if (CONFIG.LOGGING_CHANNEL_ID) {
      const logChan = await interaction.client.channels.fetch(CONFIG.LOGGING_CHANNEL_ID).catch(() => null);
      if (logChan) {
        await enqueueSend(logChan, `📝 ${channel.name} created by ${interaction.user.tag}`);
      }
    }
  } catch (err) {
    console.error('Ticket creation error:', err);
    await interaction.editReply('Failed to create ticket. Please contact an administrator.');
  }
}

/** Build and send the welcome / info / resources embeds when a ticket is created via the modal. */
async function postTicketWelcomeEmbeds(channel, interaction, email, game, description) {
  const descTrimmed = description.length > 500 ? description.slice(0, 497) + '…' : description;

  const welcomeEmbed = new EmbedBuilder()
    .setTitle("We got your ticket.")
    .setDescription("We'll be with you as soon as possible.")
    .setColor(5763719)
    .setThumbnail("https://indifferentbroccoli.com/img/broccoli_shadow_square.png");

  const infoEmbed = new EmbedBuilder()
    .setColor(5763719)
    .setDescription(truncateEmbedDescription(
      `**Account Email:**\n\`\`\`\n${sanitizeEmbedText(email)}\n\`\`\`\n` +
      `**Game:**\n\`\`\`\n${sanitizeEmbedText(game) || "Not specified"}\n\`\`\`\n` +
      `**What do you need help with?**\n\`\`\`\n${sanitizeEmbedText(descTrimmed)}\n\`\`\``
    ));

  const resourcesEmbed = new EmbedBuilder()
    .setTitle("We're ~~happy~~ indifferent to help. :indifferentbroccoli:")
    .setDescription("Please feel free to add any additional information to the ticket, including recent changes to the server, if any.")
    .setColor(5763719)
    .addFields(
      { name: "Check out our wiki for guides:", value: "[Indifferent Broccolipedia](https://wiki.indifferentbroccoli.com)", inline: false }
    )
    .setFooter({ text: "indifferent broccoli tickets (:|)", iconURL: "https://i.ibb.co/sJdytfFM/Untitled-design-6.png" });

  const actionRow = getTicketActionRow({ escalationTier: 0 });

  let welcomeMsg;
  try {
    welcomeMsg = await enqueueSend(channel, {
      content: `Hey There ${interaction.user} 🥦`,
      embeds: [welcomeEmbed, infoEmbed, resourcesEmbed],
      components: [actionRow]
    });

    await Ticket.updateOne(
      { discordThreadId: channel.id },
      { $set: { welcomeMessageId: welcomeMsg.id } }
    );
  } catch (err) {
    console.error('welcomeMessageId-save', err);
  }
  return welcomeMsg;
}

// ============================================================
// Dispatch tables
// ============================================================

/** Buttons that don't depend on a ticket-bound channel. */
const FREE_BUTTON_HANDLERS = {
  open_ticket: handleOpenTicketModal,
  open_ticket_thread: handleOpenTicketModal,
  open_ticket_channel: handleOpenTicketModal,
  cancel_delete_tag: handleTagDeleteCancel
};

/** Buttons that fire inside a ticket channel. The dispatcher does the lookup. */
const TICKET_BUTTON_HANDLERS = {
  claim_ticket: handleClaimButton,
  close_ticket: handleCloseButton,
  confirm_close: handleConfirmCloseRequest,
  confirm_close_with_email: handleConfirmCloseRequest,
  confirm_close_no_email: handleConfirmCloseRequest,
  cancel_close: handleCancelCloseRequest,
  escalate_ticket: handleEscalatePrompt,
  escalate_to_tier2: handleEscalateButton,
  escalate_to_tier3: handleEscalateButton,
  deescalate_ticket: handleDeescalateButton
};

async function handleButton(interaction) {
  const { customId } = interaction;

  // Tag-delete confirm has a dynamic id (`confirm_delete_tag::<name>`).
  if (customId.startsWith('confirm_delete_tag::')) {
    return handleTagDeleteConfirm(interaction);
  }

  const freeHandler = FREE_BUTTON_HANDLERS[customId];
  if (freeHandler) return freeHandler(interaction);

  const ticketHandler = TICKET_BUTTON_HANDLERS[customId];
  if (!ticketHandler) return;

  const ticket = await findTicketForChannel(
    interaction,
    'This channel is not linked to a ticket, or the ticket could not be found.'
  );
  if (!ticket) return;
  return ticketHandler(interaction, ticket);
}

module.exports = { handleButton, handleTicketModal };