const { SlashCommandBuilder, ActionRowBuilder, ChannelSelectMenuBuilder, StringSelectMenuBuilder, ModalBuilder, TextInputBuilder, TextInputStyle, ComponentType } = require('discord.js');
const api = require('../api');
const { readDb, writeDb } = require('../../backend/db.js');

const defaultLeaveMessages = ["{user} has left the server.", "Goodbye, {user}.", "We'll miss you, {user}."];

module.exports = {
  name: 'setup-leave',
  description: 'Interactively set up the leave message for this server.',
  enabled: true,
  builder: new SlashCommandBuilder()
    .setName('setup-leave')
    .setDescription('Interactively set up the leave message for this server.'),
  async execute(interaction) {
    const db = readDb();
    const guildId = interaction.guildId;

    if (!db[guildId]) {
      db[guildId] = {};
    }

    const channelSelect = new ChannelSelectMenuBuilder()
      .setCustomId('leave_channel_select')
      .setPlaceholder('Select the channel for leave messages.')
      .setChannelTypes([0]); // Text channels

    const row1 = new ActionRowBuilder().addComponents(channelSelect);

    const channelReply = await interaction.reply({
      content: 'Please select the channel where you want leave messages to be sent.',
      components: [row1],
  flags: 64,
    });

    try {
      const channelConfirmation = await channelReply.awaitMessageComponent({
        componentType: ComponentType.ChannelSelect,
        time: 60000,
      });

      const channelId = channelConfirmation.values[0];
      try {
        const existing = (await api.getServerSettings(guildId)) || {};
        existing.leaveEnabled = true;
        existing.leaveChannel = channelId;
        await api.upsertServerSettings(guildId, existing);
      } catch (e) {
        console.error('Error persisting leave settings to backend, falling back to local:', e);
        const db = readDb();
        if (!db[guildId]) db[guildId] = {};
        db[guildId].leaveChannel = channelId;
        db[guildId].leaveEnabled = true;
        writeDb(db);
      }

      const messageOptions = defaultLeaveMessages.map(msg => ({
        label: msg.length > 100 ? msg.substring(0, 97) + '...' : msg,
        value: msg,
      }));

      messageOptions.push({
        label: 'Custom Message',
        value: 'custom',
      });

      const messageSelect = new StringSelectMenuBuilder()
        .setCustomId('leave_message_select')
        .setPlaceholder('Select a leave message or create your own.')
        .addOptions(messageOptions);

      const row2 = new ActionRowBuilder().addComponents(messageSelect);

      await channelConfirmation.update({
        content: `Channel <#${channelId}> selected. Now, please select a leave message.`,
        components: [row2],
      });

      const messageConfirmation = await channelReply.awaitMessageComponent({
        componentType: ComponentType.StringSelect,
        time: 60000,
      });

      const selectedMessage = messageConfirmation.values[0];

      if (selectedMessage === 'custom') {
        const modal = new ModalBuilder()
          .setCustomId('leave_custom_message_modal')
          .setTitle('Custom Leave Message');

        const messageInput = new TextInputBuilder()
          .setCustomId('custom_message_input')
          .setLabel("Your custom message")
          .setPlaceholder('Use {user} for username and {server} for server name.')
          .setStyle(TextInputStyle.Paragraph)
          .setRequired(true);

        const firstActionRow = new ActionRowBuilder().addComponents(messageInput);
        modal.addComponents(firstActionRow);

        await messageConfirmation.showModal(modal);

        const modalSubmit = await interaction.awaitModalSubmit({
          time: 300000,
        });

        const customMessage = modalSubmit.fields.getTextInputValue('custom_message_input');
        try {
          const existing = (await api.getServerSettings(guildId)) || {};
          existing.leaveMessage = customMessage;
          await api.upsertServerSettings(guildId, existing);
        } catch (e) {
          console.error('Error persisting leave message to backend, falling back to local:', e);
          const db = readDb();
          if (!db[guildId]) db[guildId] = {};
          db[guildId].leaveMessage = customMessage;
          writeDb(db);
        }

        await modalSubmit.reply({
          content: `Leave message setup complete! Channel: <#${channelId}>, Message: "${customMessage}"`,
          flags: 64,
        });

      } else {
        try {
          const existing = (await api.getServerSettings(guildId)) || {};
          existing.leaveMessage = selectedMessage;
          await api.upsertServerSettings(guildId, existing);
        } catch (e) {
          console.error('Error persisting leave message to backend, falling back to local:', e);
          const db = readDb();
          if (!db[guildId]) db[guildId] = {};
          db[guildId].leaveMessage = selectedMessage;
          writeDb(db);
        }
        await messageConfirmation.update({
          content: `Leave message setup complete! Channel: <#${channelId}>, Message: "${selectedMessage}"`,
          components: [],
        });
      }
    } catch (error) {
      console.error('Error during leave setup:', error);
      await interaction.editReply({ content: 'Configuration timed out or an error occurred.', components: [] });
    }
  },
};