/**
 * Slash command, context menu, and autocomplete dispatcher.
 *
 * Submodules own command handlers by topic:
 *   helpers.js     — requireStaffRole, fetchLoggingChannel
 *   escalation.js  — runEscalation, runDeescalation, handleEscalate, handleDeescalate
 *   close.js       — handleForceClose, handleCancelClose, handleCloseTimer (+ finalize/transcript)
 *   response.js    — /response subcommands + handleAutocomplete
 *   panel.js       — handlePanel, handleSignature
 *   contextMenu.js — handleCreateTicketFromMessage, handleViewUserTickets
 *
 * This file holds the dispatchers, the small "remainder" handlers
 * (channel-mod, settings toggles, /help, /notifydm), and the public
 * module.exports surface that handlers/buttons.js + broccolini-discord.js
 * import from `require('./commands')`.
 */
const { EmbedBuilder, MessageFlags } = require('discord.js');
const { mongoose } = require('../../db-connection');
const { CONFIG } = require('../../config');
const { setNotifyDm } = require('../../services/staffSettings');
const { makeTicketName, resolveCreatorNickname } = require('../../services/tickets');
const { enqueueRename, enqueueMove, enqueueOverwrite, enqueueTopic, enqueueSend } = require('../../services/channelQueue');
const { logError, logTicketEvent } = require('../../services/debugLog');
const { findTicketForChannel } = require('../sharedHelpers');

const { requireStaffRole, fetchLoggingChannel } = require('./helpers');
const { runEscalation, runDeescalation, handleEscalate, handleDeescalate } = require('./escalation');
const { handleCloseTimer, handleCancelClose, handleForceClose } = require('./close');
const { handleResponse, handleAutocomplete } = require('./response');
const { handlePanel, handleSignature } = require('./panel');
const { handleCreateTicketFromMessage, handleViewUserTickets } = require('./contextMenu');

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

// ============================================================
// Remainder handlers — small enough not to deserve their own module.
// ============================================================

async function handleNotifyDm(interaction) {
  try {
    const setting = interaction.options.getString('setting') === 'on';
    await setNotifyDm(interaction.user.id, interaction.guildId, setting);
    await interaction.reply({
      content: `DM notifications ${setting ? 'enabled ✅' : 'disabled 🔕'}.`,
      flags: MessageFlags.Ephemeral
    });
  } catch (err) {
    console.error('notifydm error:', err);
    await interaction.reply({ content: 'Failed to update notification setting.', flags: MessageFlags.Ephemeral }).catch(() => {});
  }
}

async function handleAdd(interaction) {
  const user = interaction.options.getUser('user');
  const ticket = await findTicketForChannel(interaction);
  if (!ticket) return;

  // Defer up front: enqueueOverwrite serializes behind any pending rename/move
  // on this channel and can exceed Discord's 3s interaction-token window.
  await interaction.deferReply();

  try {
    await enqueueOverwrite(interaction.channel, user.id, {
      ViewChannel: true,
      SendMessages: true,
      ReadMessageHistory: true
    });
    await interaction.editReply({ content: `Added ${user} to this ticket.`, allowedMentions: { parse: ['users'] } });
  } catch (err) {
    console.error('Add user error:', err);
    await interaction.editReply({ content: 'Failed to add user.' }).catch(() => {});
  }
}

async function handleRemove(interaction) {
  const user = interaction.options.getUser('user');
  const ticket = await findTicketForChannel(interaction);
  if (!ticket) return;

  // Defer up front — same reason as handleAdd.
  await interaction.deferReply();

  try {
    await enqueueOverwrite(interaction.channel, user.id, null, 'delete');
    await interaction.editReply({ content: `Removed ${user} from this ticket.`, allowedMentions: { parse: ['users'] } });
  } catch (err) {
    console.error('Remove user error:', err);
    await interaction.editReply({ content: 'Failed to remove user.' }).catch(() => {});
  }
}

async function handleTransfer(interaction) {
  const member = interaction.options.getUser('member');
  const reason = interaction.options.getString('reason') || 'No reason provided';
  const ticket = await findTicketForChannel(interaction);
  if (!ticket) return;

  const staffRoleId = CONFIG.ROLE_TO_PING_ID;
  const guildMember = await interaction.guild.members.fetch(member.id).catch(() => null);

  if (!guildMember || !guildMember.roles.cache.has(staffRoleId)) {
    return interaction.reply({ content: 'The target member must have the staff role.', flags: MessageFlags.Ephemeral });
  }

  // Defer before the DB write + rename so the interaction token survives.
  await interaction.deferReply();

  try {
    const claimerLabel = guildMember.displayName || guildMember.user.username;

    await Ticket.updateOne(
      { gmailThreadId: ticket.gmailThreadId },
      { $set: { claimedBy: claimerLabel, claimerId: guildMember.id } }
    );
    ticket.claimedBy = claimerLabel;
    ticket.claimerId = guildMember.id;

    // Rename the channel to reflect the new claimer — mirrors the /claim
    // button flow (applyClaim in handlers/buttons.js). Picks the new
    // claimer's emoji from STAFF_EMOJIS and uses the escalated-claimed
    // variant when tier >= 1.
    const claimerEmoji = CONFIG.STAFF_EMOJIS[guildMember.id] || CONFIG.CLAIMER_EMOJI_FALLBACK;
    const creatorNickname = await resolveCreatorNickname(interaction.guild, ticket);
    const tier = ticket.escalationTier ?? (ticket.escalated ? 1 : 0);
    const state = tier >= 1 ? 'escalated-claimed' : 'claimed';
    enqueueRename(interaction.channel, makeTicketName(state, ticket, creatorNickname, claimerEmoji))
      .catch(err => logError('rename', err).catch(() => {}));

    // `reason` is staff-supplied freeform text; gate to user pings so @everyone in it can't mass-ping.
    await interaction.editReply({
      content: `Ticket transferred to ${member} by ${interaction.user}.\nReason: ${reason}`,
      allowedMentions: { parse: ['users'] }
    });

    const logChan = await fetchLoggingChannel(interaction.client);
    if (logChan) {
      await enqueueSend(logChan, {
        content: `Ticket ${interaction.channel} transferred from ${interaction.user.tag} to ${member.tag}.\nReason: ${reason}`,
        allowedMentions: { parse: ['users'] }
      });
    }
  } catch (err) {
    console.error('Transfer error:', err);
    await interaction.editReply({ content: 'Failed to transfer ticket.' }).catch(() => {});
  }
}

async function handleMove(interaction) {
  const category = interaction.options.getChannel('category');
  const ticket = await findTicketForChannel(interaction);
  if (!ticket) return;

  // Defer up front — enqueueMove serializes behind any pending rename and
  // setParent itself can take a moment on busy channels.
  await interaction.deferReply();

  try {
    await enqueueMove(interaction.channel, category.id);
    await interaction.editReply(`Moved ticket to **${category.name}**.`);

    const logChan = await fetchLoggingChannel(interaction.client);
    if (logChan) {
      await enqueueSend(logChan,
        `Ticket ${interaction.channel} moved to category **${category.name}** by ${interaction.user.tag}`
      );
    }
  } catch (err) {
    console.error('Move error:', err);
    await interaction.editReply({ content: 'Failed to move ticket.' }).catch(() => {});
  }
}

async function handleTopic(interaction) {
  const text = interaction.options.getString('text');
  const ticket = await findTicketForChannel(interaction);
  if (!ticket) return;

  // Defer up front — enqueueTopic serializes behind any pending rename/move.
  await interaction.deferReply();

  try {
    await enqueueTopic(interaction.channel, text);
    await interaction.editReply('Topic updated successfully.');
  } catch (err) {
    console.error('Topic error:', err);
    await interaction.editReply({ content: 'Failed to update topic.' }).catch(() => {});
  }
}

async function handleStaffThread(interaction) {
  const sub = interaction.options.getSubcommand();
  if (sub === 'toggle') {
    CONFIG.STAFF_THREAD_ENABLED = !CONFIG.STAFF_THREAD_ENABLED;
    return interaction.reply({ content: `Staff threads are now **${CONFIG.STAFF_THREAD_ENABLED ? 'enabled' : 'disabled'}**.`, flags: MessageFlags.Ephemeral });
  }
  if (sub === 'name') {
    const name = interaction.options.getString('thread_name').slice(0, 100);
    CONFIG.STAFF_THREAD_NAME = name;
    return interaction.reply({ content: `Staff thread name set to **${name}**.`, flags: MessageFlags.Ephemeral });
  }
  if (sub === 'autorole') {
    const enabled = interaction.options.getBoolean('enabled');
    CONFIG.STAFF_THREAD_AUTO_ADD_ROLE = enabled;
    return interaction.reply({ content: `Auto-add role to staff thread is now **${enabled ? 'enabled' : 'disabled'}**.`, flags: MessageFlags.Ephemeral });
  }
}

async function handlePinMessages(interaction) {
  const sub = interaction.options.getSubcommand();
  const enabled = interaction.options.getBoolean('enabled');
  if (sub === 'initial') {
    CONFIG.PIN_INITIAL_MESSAGE_ENABLED = enabled;
    return interaction.reply({ content: `Auto-pin initial message is now **${enabled ? 'enabled' : 'disabled'}**.`, flags: MessageFlags.Ephemeral });
  }
  if (sub === 'escalation') {
    CONFIG.PIN_ESCALATION_MESSAGE_ENABLED = enabled;
    return interaction.reply({ content: `Auto-pin escalation message is now **${enabled ? 'enabled' : 'disabled'}**.`, flags: MessageFlags.Ephemeral });
  }
  if (sub === 'suppress') {
    CONFIG.PIN_SUPPRESS_SYSTEM_MESSAGE = enabled;
    return interaction.reply({ content: `Suppress pin system message is now **${enabled ? 'enabled' : 'disabled'}**.`, flags: MessageFlags.Ephemeral });
  }
}

async function handleGmailPoll(interaction) {
  const requested = parseInt(interaction.options.getString('interval'), 10);
  // Defense-in-depth: the slash command's addChoices already floors at 30s, but
  // clamp the resolved ms here too so any future caller (or skewed input) can't
  // drop below 30s and trip Gmail's per-user quota under sustained load.
  const ms = Math.max(30000, requested * 1000);
  const seconds = ms / 1000;
  // Lazy require — broccolini-discord re-exports this and we'd otherwise cycle.
  const { setGmailPollInterval } = require('../../broccolini-discord');
  setGmailPollInterval(ms);
  logTicketEvent('Gmail poll interval updated', [
    { name: 'Interval', value: `${seconds}s` },
    { name: 'Set by', value: interaction.user.tag }
  ], interaction).catch(() => {});
  return interaction.reply({ content: `Gmail poll interval set to ${seconds} seconds.`, flags: MessageFlags.Ephemeral });
}

async function handleHelp(interaction) {
  const embed = new EmbedBuilder()
    .setTitle('Ticket System - Commands')
    .setColor(CONFIG.EMBED_COLOR_OPEN)
    .addFields([
      {
        name: 'User Management',
        value: '`/add @user` - Add user to ticket\n`/remove @user` - Remove user from ticket'
      },
      {
        name: 'Ticket Management',
        value: '`/transfer @staff` - Transfer ticket to another staff member\n`/move #category` - Move ticket to another category\n`/force-close` - Force close ticket without confirmation\n`/topic <text>` - Set ticket topic/description'
      },
      {
        name: 'Saved Responses',
        value: '`/response send <name>` - Send saved response\n`/response create|edit|delete|list` - Manage saved responses'
      },
      {
        name: 'Variables (for responses)',
        value: '`{ticket.user}`, `{ticket.email}`, `{ticket.number}`, `{ticket.subject}`, `{staff.name}`, `{server.name}`, `{date}`, `{time}`'
      },
      {
        name: 'Panel System',
        value: '`/panel #channel` - Create a ticket panel for Discord-side tickets'
      },
      {
        name: 'Escalation',
        value: '`/escalate [reason] [tier]` - Escalate ticket (tier 2 or 3, or one step)\n`/deescalate` - De-escalate ticket (tier 3→2 or tier 2→normal)'
      }
    ])
    .setFooter({ text: 'Click buttons on ticket messages to claim/close' });

  await interaction.reply({ embeds: [embed], flags: MessageFlags.Ephemeral });
}

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

const COMMAND_HANDLERS = {
  escalate: handleEscalate,
  deescalate: handleDeescalate,
  notifydm: handleNotifyDm,
  add: handleAdd,
  remove: handleRemove,
  transfer: handleTransfer,
  move: handleMove,
  staffthread: handleStaffThread,
  pinmessages: handlePinMessages,
  gmailpoll: handleGmailPoll,
  closetimer: handleCloseTimer,
  'cancel-close': handleCancelClose,
  'force-close': handleForceClose,
  topic: handleTopic,
  response: handleResponse,
  signature: handleSignature,
  help: handleHelp,
  panel: handlePanel
};

const CONTEXT_MENU_HANDLERS = {
  'Create Ticket From Message': handleCreateTicketFromMessage,
  'View User Tickets': handleViewUserTickets
};

/**
 * Slash-command dispatcher. Every command is staff-only — including /help,
 * which previously bypassed the role check.
 */
async function handleCommand(interaction) {
  if (await requireStaffRole(interaction)) return;
  const handler = COMMAND_HANDLERS[interaction.commandName];
  if (handler) await handler(interaction);
}

/** Context-menu dispatcher. All entries are staff-only. */
async function handleContextMenu(interaction) {
  if (await requireStaffRole(interaction)) return;
  const handler = CONTEXT_MENU_HANDLERS[interaction.commandName];
  if (handler) await handler(interaction);
}

module.exports = {
  handleCommand,
  handleContextMenu,
  handleAutocomplete,
  runEscalation,
  runDeescalation
};