/**
 * Force-close flow: /force-close, /cancel-close, /closetimer, plus the
 * countdown-elapses finalize step and transcript renderer that the
 * countdown's setTimeout calls back into.
 *
 * Note: the button-driven close path lives in handlers/buttons.js
 * (handleCloseButton / handleConfirmCloseRequest / runFinalClose).
 * This module covers the slash-command-driven path only.
 */
const { AttachmentBuilder, MessageFlags } = require('discord.js');
const { mongoose } = require('../../db-connection');
const { CONFIG } = require('../../config');
const { enqueueSend } = require('../../services/channelQueue');
const { logTicketEvent, logError } = require('../../services/debugLog');
const { moveThreadToFolder } = require('../../services/gmailLabels');
const { pendingCloses } = require('../pendingCloses');
const { findTicketForChannel } = require('../sharedHelpers');
const { attemptCloseTransition } = require('../../services/tickets');
const { buildTranscriptText, formatDateForTranscript, renderTranscriptHeader } = require('../../services/transcript');
const { recordAction } = require('../../services/staffStats');

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

async function handleCloseTimer(interaction) {
  const seconds = parseInt(interaction.options.getString('seconds'), 10);
  CONFIG.FORCE_CLOSE_TIMER = seconds;
  logTicketEvent('Close timer updated', [
    { name: 'Duration', value: `${seconds}s` },
    { name: 'Set by', value: interaction.user.tag }
  ], interaction).catch(() => {});
  return interaction.reply({ content: `Force-close timer set to ${seconds} seconds.`, flags: MessageFlags.Ephemeral });
}

async function handleCancelClose(interaction) {
  const pending = pendingCloses.get(interaction.channel.id);
  if (!pending) {
    return interaction.reply({ content: 'No pending close for this channel.', flags: MessageFlags.Ephemeral });
  }
  clearTimeout(pending.timeout);
  logTicketEvent('Force-close cancelled', [
    { name: 'Ticket', value: interaction.channel.name || interaction.channel.id },
    { name: 'Cancelled by', value: interaction.user.tag },
    { name: 'Original setter', value: pending.username || 'Unknown' }
  ], interaction).catch(() => {});
  pendingCloses.delete(interaction.channel.id);
  return interaction.reply({ content: 'Close cancelled.', flags: MessageFlags.Ephemeral });
}

async function handleForceClose(interaction) {
  const ticket = await findTicketForChannel(interaction);
  if (!ticket) return;

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

  const timerSeconds = CONFIG.FORCE_CLOSE_TIMER;
  await interaction.reply(`Closing ticket in ${timerSeconds} seconds. Use \`/cancel-close\` to abort.`);

  const channelRef = interaction.channel;
  const clientRef = interaction.client;
  const timerId = setTimeout(() => finalizeForceClose(channelRef, clientRef), timerSeconds * 1000);
  pendingCloses.set(channelRef.id, { timeout: timerId, username: interaction.user.tag, closerId: interaction.user.id });
}

/** Performs the actual force-close work after the countdown elapses. */
async function finalizeForceClose(channelRef, clientRef, _TicketModel, _recordAction, _pendingCloses) {
  const T = _TicketModel || Ticket;
  const record = _recordAction || recordAction;
  const pc = _pendingCloses || pendingCloses;
  const pending = pc.get(channelRef.id);
  pc.delete(channelRef.id);
  const closerId = pending?.closerId ?? null;
  const freshTicket = await T.findOne({ discordThreadId: channelRef.id }).lean();
  if (!freshTicket || freshTicket.status === 'closed') return;

  try {
    const { transitioned, ticket: closedTicket } = await attemptCloseTransition(freshTicket.gmailThreadId, {}, { welcomeMessageId: '' }, T);
    if (transitioned) {
      record(closerId ?? 'system', 'close', {
        ticket: closedTicket,
        guildId: channelRef.guild?.id,
        closerType: closerId ? 'staff' : 'system',
        resolverId: closedTicket.claimerId ?? null,
        wasClaimed: Boolean(closedTicket.claimerId)
      });
    }

    // File the email thread into the Resolved folder — non-fatal, email tickets only.
    if (!freshTicket.gmailThreadId.startsWith('discord-')) {
      moveThreadToFolder(freshTicket.gmailThreadId, 'RESOLVED')
        .catch(err => logError('gmailLabels: resolved move', err).catch(() => {}));
    }

    await enqueueSend(channelRef, 'Ticket force-closed. Archiving...');
    await postTranscript(channelRef, clientRef, freshTicket).catch(tErr =>
      console.error('Transcript error (force-close):', tErr)
    );

    setTimeout(() => {
      channelRef.delete('Ticket force-closed').catch(e =>
        console.error('Failed to delete channel:', e)
      );
    }, 5000);
  } catch (err) {
    console.error('Force close error:', err);
  }
}

/** Render and post a closing transcript for a ticket. */
async function postTranscript(channelRef, clientRef, freshTicket) {
  await enqueueSend(channelRef, CONFIG.DISCORD_CLOSE_MESSAGE);

  const log = await buildTranscriptText(channelRef, freshTicket);
  const file = new AttachmentBuilder(Buffer.from(log), {
    name: `transcript-${channelRef.name}.txt`
  });

  const transcriptChan = await clientRef.channels
    .fetch(CONFIG.TRANSCRIPT_CHANNEL_ID)
    .catch(() => null);
  if (!transcriptChan) return;

  const openedStr = formatDateForTranscript(freshTicket.createdAt);
  const closedStr = formatDateForTranscript(new Date());
  const transcriptContent = renderTranscriptHeader(channelRef.name, freshTicket.senderEmail, openedStr, closedStr);
  await enqueueSend(transcriptChan, { content: transcriptContent, files: [file], allowedMentions: { parse: [] } });
}

module.exports = { handleCloseTimer, handleCancelClose, handleForceClose, finalizeForceClose };