const { SlashCommandBuilder, EmbedBuilder } = require('discord.js');

module.exports = {
  data: new SlashCommandBuilder()
    .setName('rank')
    .setDescription('View your unified level and XP across all platforms')
    .addUserOption(option =>
      option.setName('user')
        .setDescription('User to check (defaults to yourself)')
        .setRequired(false)
    ),

  async execute(interaction, supabase, client) {
    if (!supabase) {
      return interaction.reply({ content: 'Database not configured.', ephemeral: true });
    }

    const target = interaction.options.getUser('user') || interaction.user;
    await interaction.deferReply();

    try {
      const { data: link } = await supabase
        .from('discord_links')
        .select('user_id, primary_arm')
        .eq('discord_id', target.id)
        .single();

      if (!link) {
        return interaction.editReply({
          embeds: [
            new EmbedBuilder()
              .setColor(0xff6b6b)
              .setDescription(`${target.id === interaction.user.id ? 'You are' : `${target.tag} is`} not linked to AeThex. Use \`/verify\` to link your account.`)
          ]
        });
      }

      const { data: profile } = await supabase
        .from('user_profiles')
        .select('username, avatar_url, xp, bio')
        .eq('id', link.user_id)
        .single();

      const xp = profile?.xp || 0;
      const level = Math.floor(Math.sqrt(xp / 100));
      const currentLevelXp = level * level * 100;
      const nextLevelXp = (level + 1) * (level + 1) * 100;
      const progress = xp - currentLevelXp;
      const needed = nextLevelXp - currentLevelXp;
      const progressPercent = Math.floor((progress / needed) * 100);

      const progressBar = createProgressBar(progressPercent);

      const { count: rankPosition } = await supabase
        .from('user_profiles')
        .select('*', { count: 'exact', head: true })
        .gt('xp', xp);

      const embed = new EmbedBuilder()
        .setColor(0x7c3aed)
        .setTitle(`${profile?.username || target.tag}'s Rank`)
        .setThumbnail(profile?.avatar_url || target.displayAvatarURL())
        .addFields(
          { name: 'Level', value: `**${level}**`, inline: true },
          { name: 'Total XP', value: `**${xp.toLocaleString()}**`, inline: true },
          { name: 'Rank', value: `#${(rankPosition || 0) + 1}`, inline: true },
          { name: 'Progress to Next Level', value: `${progressBar}\n${progress.toLocaleString()} / ${needed.toLocaleString()} XP (${progressPercent}%)` },
          { name: 'Primary Realm', value: link.primary_arm || 'None set', inline: true }
        )
        .setFooter({ text: 'XP earned across Discord & AeThex platforms' })
        .setTimestamp();

      await interaction.editReply({ embeds: [embed] });

    } catch (error) {
      console.error('Rank error:', error);
      await interaction.editReply({ content: 'Failed to fetch rank data.' });
    }
  },
};

function createProgressBar(percent) {
  const filled = Math.floor(percent / 10);
  const empty = 10 - filled;
  return '█'.repeat(filled) + '░'.repeat(empty);
}