/**
 * Entry point – initializes the Discord bot, wires event handlers,
 * connects to MongoDB, starts Gmail polling, and runs the Express healthcheck.
 */
const { Client, GatewayIntentBits, Partials } = require('discord.js');
const express = require('express');
const { connectMongoDB } = require('./db-connection');
const { CONFIG } = require('./config');

// Handlers
const { handleButton, handleTicketModal } = require('./handlers/buttons');
const { handleCommand, handleContextMenu, handleAutocomplete } = require('./handlers/commands');
const { handleSendAccountInfoToChannel, BUTTON_PREFIX } = require('./handlers/accountinfo');
const { handleSetupButton, handleSetupModal, handleSetupSelect, PREFIX_BUTTON: SETUP_BUTTON_PREFIX, PREFIX_MODAL: SETUP_MODAL_PREFIX, PREFIX_SELECT: SETUP_SELECT_PREFIX } = require('./handlers/setup');
const { handleDiscordReply } = require('./handlers/messages');

// Services & jobs
const { sendTicketClosedEmail } = require('./services/gmail');
const { checkAutoClose, checkReminders, checkAutoUnclaim } = require('./services/tickets');
const { registerCommands } = require('./commands/register');
const { poll } = require('./gmail-poll');
const { syncZammadReplies } = require('./services/zammad-sync');
const { setClient: setDebugClient } = require('./services/debugLog');
const { ZAMMAD } = require('./config');

// Re-export utilities for any external consumers
const { sendGmailReply } = require('./services/gmail');
const { getNextTicketNumber } = require('./services/tickets');
const { getCleanBody, detectGame, stripEmailQuotes, stripMobileFooter, htmlToTextWithBlocks } = require('./utils');

// --- VALIDATE CONFIG ---
if (!CONFIG.DISCORD_TOKEN) {
  console.error('DISCORD_TOKEN is not set in .env');
  process.exit(1);
}
if (!CONFIG.TICKET_CATEGORY_ID) {
  console.error('TICKET_CATEGORY_ID is not set in .env – cannot create ticket channels.');
  process.exit(1);
}
if (!CONFIG.CLIENT_ID) {
  console.error('DISCORD_APPLICATION_ID is not set in .env – cannot register slash commands.');
}
if (!process.env.GOOGLE_CLIENT_ID || !process.env.GOOGLE_CLIENT_SECRET) {
  console.error('GOOGLE_CLIENT_ID or GOOGLE_CLIENT_SECRET is not set in .env – Gmail OAuth may fail.');
}

// --- DISCORD CLIENT ---
const client = new Client({
  intents: [
    GatewayIntentBits.Guilds,
    GatewayIntentBits.GuildMessages,
    GatewayIntentBits.MessageContent,
    GatewayIntentBits.GuildMembers
  ],
  partials: [Partials.Channel]
});

// --- EVENT: interactionCreate ---
client.on('interactionCreate', async interaction => {
  // Account-info "send to channel" button
  if (interaction.isButton() && interaction.customId.startsWith(BUTTON_PREFIX)) {
    const handled = await handleSendAccountInfoToChannel(interaction);
    if (handled) return;
  }

  // Setup wizard buttons (must run before generic button handler so we don't hit "Data missing.")
  if (interaction.isButton() && interaction.customId.startsWith(SETUP_BUTTON_PREFIX)) {
    try {
      const handled = await handleSetupButton(interaction);
      if (handled) return;
    } catch (err) {
      console.error('Setup button error:', err);
      await interaction.reply({
        content: `Setup error: ${err.message}. Try \`/setup\` again.`,
        ephemeral: true
      }).catch(() => {});
      return;
    }
  }

  // Buttons (includes open_ticket, claim, close, priority, tag-delete, etc.)
  if (interaction.isButton()) {
    return handleButton(interaction);
  }

  // Setup wizard modal (panel name)
  if (interaction.isModalSubmit() && interaction.customId.startsWith(SETUP_MODAL_PREFIX)) {
    const handled = await handleSetupModal(interaction);
    if (handled) return;
  }

  // Modal submissions (ticket_modal from the panel button)
  if (interaction.isModalSubmit() && ['ticket_modal', 'ticket_modal_thread', 'ticket_modal_channel'].includes(interaction.customId)) {
    return handleTicketModal(interaction);
  }

  // Setup wizard select menus (roles, category, transcript channel, panel channel)
  if (interaction.customId?.startsWith(SETUP_SELECT_PREFIX) && (interaction.isRoleSelectMenu() || interaction.isChannelSelectMenu())) {
    const handled = await handleSetupSelect(interaction);
    if (handled) return;
  }

  // Slash commands
  if (interaction.isChatInputCommand()) {
    return handleCommand(interaction);
  }

  // Context menu commands
  if (interaction.isMessageContextMenuCommand() || interaction.isUserContextMenuCommand()) {
    return handleContextMenu(interaction);
  }

  // Autocomplete
  if (interaction.isAutocomplete()) {
    return handleAutocomplete(interaction);
  }
});

// --- EVENT: messageCreate (Discord → Gmail reply) ---
client.on('messageCreate', handleDiscordReply);

// --- EVENT: ready ---
client.once('ready', async () => {
  if (!process.env.MONGODB_URI) {
    console.error('MONGODB_URI is not set in .env. Bridge requires MongoDB.');
    process.exit(1);
  }
  await connectMongoDB(process.env.MONGODB_URI);
  setDebugClient(client);
  console.log(`gmail-discord instance active on port ${CONFIG.PORT}`);

  const guild = CONFIG.DISCORD_GUILD_ID
    ? client.guilds.cache.get(CONFIG.DISCORD_GUILD_ID)
    : client.guilds.cache.first();

  if (!guild) {
    console.warn('No guild found on ready.');
  } else {
    const parent = guild.channels.cache.get(CONFIG.TICKET_CATEGORY_ID);
    console.log('Ticket parent lookup:', {
      id: CONFIG.TICKET_CATEGORY_ID,
      exists: !!parent,
      type: parent?.type
    });
  }

  registerCommands().catch(console.error);

  // Gmail polling every 30 seconds
  setInterval(() => poll(client), 30000);
  poll(client);

  // Zammad reply sync: push agent replies from Zammad to Discord/Gmail every 30 seconds
  if (ZAMMAD?.URL && ZAMMAD?.TOKEN) {
    setInterval(() => syncZammadReplies(client), 30000);
    syncZammadReplies(client);
    console.log('✓ Zammad reply sync enabled: every 30 seconds');
  }

  // Auto-close check every hour
  if (CONFIG.AUTO_CLOSE_ENABLED) {
    setInterval(() => checkAutoClose(client, sendTicketClosedEmail), 60 * 60 * 1000);
    checkAutoClose(client, sendTicketClosedEmail);
    console.log('✓ Auto-close enabled: checking every hour');
  }

  // Reminder check every 30 minutes
  if (CONFIG.REMINDER_ENABLED) {
    setInterval(() => checkReminders(client), 30 * 60 * 1000);
    checkReminders(client);
    console.log('✓ Reminders enabled: checking every 30 minutes');
  }

  // Auto-unclaim check every hour
  if (CONFIG.AUTO_UNCLAIM_ENABLED) {
    setInterval(() => checkAutoUnclaim(client), 60 * 60 * 1000);
    checkAutoUnclaim(client);
    console.log('✓ Auto-unclaim enabled: checking every hour');
  }

  console.log('✓ Discord bot ready. Tag:', client.user.tag);
});

client.login(CONFIG.DISCORD_TOKEN);

// --- HEALTHCHECK ---
const app = express();
app.get('/', (req, res) => res.send('Active'));
app.listen(CONFIG.PORT, () => {
  console.log(`Healthcheck server listening on ${CONFIG.PORT}`);
});

module.exports = {
  client,
  sendGmailReply,
  sendTicketClosedEmail,
  getNextTicketNumber,
  getCleanBody,
  detectGame,
  stripEmailQuotes,
  stripMobileFooter,
  htmlToTextWithBlocks
};