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

const DAILY_XP = 50;
const STREAK_BONUS = 10;
const MAX_STREAK_BONUS = 100;

module.exports = {
  data: new SlashCommandBuilder()
    .setName('daily')
    .setDescription('Claim your daily XP bonus'),

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

    await interaction.deferReply();

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

      if (!link) {
        return interaction.editReply({
          embeds: [
            new EmbedBuilder()
              .setColor(0xff6b6b)
              .setDescription('You need to link your account first! Use `/verify` to get started.')
          ]
        });
      }

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

      const now = new Date();
      const lastDaily = profile?.last_daily ? new Date(profile.last_daily) : null;
      const currentXp = profile?.xp || 0;
      let streak = profile?.daily_streak || 0;

      if (lastDaily) {
        const hoursSince = (now - lastDaily) / (1000 * 60 * 60);
        
        if (hoursSince < 20) {
          const nextClaim = new Date(lastDaily.getTime() + 20 * 60 * 60 * 1000);
          return interaction.editReply({
            embeds: [
              new EmbedBuilder()
                .setColor(0xfbbf24)
                .setTitle('Already Claimed!')
                .setDescription(`You've already claimed your daily XP.\nNext claim: <t:${Math.floor(nextClaim.getTime() / 1000)}:R>`)
                .addFields({ name: 'Current Streak', value: `🔥 ${streak} days` })
            ]
          });
        }

        if (hoursSince > 48) {
          streak = 0;
        }
      }

      streak += 1;
      const streakBonus = Math.min(streak * STREAK_BONUS, MAX_STREAK_BONUS);
      const totalXp = DAILY_XP + streakBonus;
      const newXp = currentXp + totalXp;

      await supabase
        .from('user_profiles')
        .update({
          xp: newXp,
          daily_streak: streak,
          last_daily: now.toISOString()
        })
        .eq('id', link.user_id);

      const newLevel = Math.floor(Math.sqrt(newXp / 100));
      const oldLevel = Math.floor(Math.sqrt(currentXp / 100));

      const embed = new EmbedBuilder()
        .setColor(0x00ff00)
        .setTitle('Daily Reward Claimed!')
        .setDescription(`You received **+${totalXp} XP**!`)
        .addFields(
          { name: 'Base XP', value: `+${DAILY_XP}`, inline: true },
          { name: 'Streak Bonus', value: `+${streakBonus}`, inline: true },
          { name: 'Current Streak', value: `🔥 ${streak} days`, inline: true },
          { name: 'Total XP', value: newXp.toLocaleString(), inline: true },
          { name: 'Level', value: `${newLevel}`, inline: true }
        )
        .setFooter({ text: 'Come back tomorrow to keep your streak!' })
        .setTimestamp();

      if (newLevel > oldLevel) {
        embed.addFields({ name: '🎉 Level Up!', value: `You reached level ${newLevel}!` });
      }

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

    } catch (error) {
      console.error('Daily error:', error);
      await interaction.editReply({ content: 'Failed to claim daily reward.' });
    }
  },
};