/**
 * Account info command: look up website User by email or Discord ID,
 * show ephemeral embed with option to send transcript to account info channel.
 */
const { EmbedBuilder, ActionRowBuilder, ButtonBuilder, ButtonStyle } = require('discord.js');
const { CONFIG } = require('../config');
const { mongoose } = require('../db-connection');

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

const BUTTON_PREFIX = 'send_account_info_';
const MAX_CUSTOM_ID_LENGTH = 100;

function buildAccountInfoEmbed(user, requestedBy = null) {
  const embed = new EmbedBuilder()
    .setTitle('Account Info')
    .setColor(CONFIG.EMBED_COLOR_INFO)
    .setTimestamp();

  embed.addFields({
    name: 'Email',
    value: user.email || '*not set*',
    inline: true
  });
  embed.addFields({
    name: 'Discord ID',
    value: user.discordID ? `<@${user.discordID}>` : '*not set*',
    inline: true
  });
  embed.addFields({
    name: 'Customer ID',
    value: user.customerId || '*not set*',
    inline: true
  });

  const servers = user.servers || [];
  const serverOrder = user.serverOrder || [];
  const ordered = serverOrder.length
    ? serverOrder.map(id => servers.find(s => s._id && s._id.toString() === id) || servers[serverOrder.indexOf(id)]).filter(Boolean)
    : servers;

  if (ordered.length === 0) {
    embed.addFields({
      name: 'Servers',
      value: '*No servers*',
      inline: false
    });
  } else {
    ordered.forEach((server, i) => {
      const n = i + 1;
      embed.addFields({
        name: `Server ${n} – Game`,
        value: server.game || '*not set*',
        inline: true
      });
      embed.addFields({
        name: `Server ${n} – IP`,
        value: server.ip || '*not set*',
        inline: true
      });
      embed.addFields({
        name: `Server ${n} – Port`,
        value: server.serverPort != null ? String(server.serverPort) : '*not set*',
        inline: true
      });
    });
  }

  if (requestedBy) {
    embed.setFooter({ text: `Requested by ${requestedBy}` });
  }

  return embed;
}

async function handleAccountInfoCommand(interaction) {
  const subcommand = interaction.options.getSubcommand();
  let user = null;

  if (subcommand === 'email') {
    const email = (interaction.options.getString('email') || '').trim().toLowerCase();
    if (!email) {
      return interaction.reply({ content: 'Please provide an email.', ephemeral: true });
    }
    user = await User.findOne({ email }).lean();
  } else if (subcommand === 'discord') {
    const target = interaction.options.getUser('user');
    if (!target) {
      return interaction.reply({ content: 'Please provide a Discord user.', ephemeral: true });
    }
    user = await User.findOne({ discordID: target.id }).lean();
  }

  if (!user) {
    return interaction.reply({
      content: subcommand === 'email' ? 'No account found for that email.' : 'No account found for that Discord user/ID.',
      ephemeral: true
    });
  }

  const embed = buildAccountInfoEmbed(user, interaction.user.tag);
  const components = [];

  if (CONFIG.ACCOUNT_INFO_CHANNEL_ID) {
    const safeEmail = (user.email || '').slice(0, 50);
    const safeDiscordId = (user.discordID || '').slice(0, 50);
    const customId = `${BUTTON_PREFIX}discord:${safeDiscordId}`;
    if (customId.length <= MAX_CUSTOM_ID_LENGTH) {
      components.push(
        new ActionRowBuilder().addComponents(
          new ButtonBuilder()
            .setCustomId(customId)
            .setLabel('Send to account info channel')
            .setStyle(ButtonStyle.Secondary)
        )
      );
    }
  }

  await interaction.reply({
    embeds: [embed],
    components,
    ephemeral: true
  });
}

async function handleSendAccountInfoToChannel(interaction) {
  if (!interaction.isButton() || !interaction.customId.startsWith(BUTTON_PREFIX)) return false;

  const payload = interaction.customId.slice(BUTTON_PREFIX.length);
  const [type, value] = payload.includes(':') ? payload.split(':') : [payload, ''];

  let user = null;
  if (type === 'email') {
    const email = Buffer.from(value, 'base64').toString('utf8').toLowerCase();
    user = await User.findOne({ email }).lean();
  } else if (type === 'discord' && value) {
    user = await User.findOne({ discordID: value }).lean();
  }

  if (!user) {
    await interaction.update({ content: 'Account no longer found.', components: [] }).catch(() =>
      interaction.followUp({ content: 'Account no longer found.', ephemeral: true })
    );
    return true;
  }

  if (!CONFIG.ACCOUNT_INFO_CHANNEL_ID) {
    await interaction.update({ content: 'Account info channel is not configured.', components: [] }).catch(() =>
      interaction.followUp({ content: 'Account info channel is not configured.', ephemeral: true })
    );
    return true;
  }

  const channel = await interaction.client.channels.fetch(CONFIG.ACCOUNT_INFO_CHANNEL_ID).catch(() => null);
  if (!channel) {
    await interaction.update({ content: 'Could not find account info channel.', components: [] }).catch(() =>
      interaction.followUp({ content: 'Could not find account info channel.', ephemeral: true })
    );
    return true;
  }

  const embed = buildAccountInfoEmbed(user, `${interaction.user.tag} (from ticket)`);
  await channel.send({ embeds: [embed] });

  await interaction.update({
    content: 'Account info sent to account transcript channel.',
    components: []
  }).catch(() =>
    interaction.followUp({ content: 'Account info sent to account transcript channel.', ephemeral: true })
  );
  return true;
}

module.exports = {
  buildAccountInfoEmbed,
  handleAccountInfoCommand,
  handleSendAccountInfoToChannel,
  BUTTON_PREFIX
};