const { SlashCommandBuilder, EmbedBuilder, ActionRowBuilder, ButtonBuilder, ButtonStyle, StringSelectMenuBuilder } = require('discord.js');

const ITEMS_PER_PAGE = 5;

const CATEGORY_INFO = {
  badge: { emoji: '🏅', name: 'Badges', description: 'Collectible profile badges' },
  title: { emoji: '🏷️', name: 'Titles', description: 'Custom titles for your profile' },
  background: { emoji: '🎨', name: 'Backgrounds', description: 'Profile card backgrounds' },
  booster: { emoji: '⚡', name: 'Boosters', description: 'Temporary XP multipliers' },
  role: { emoji: '👑', name: 'Roles', description: 'Purchasable server roles' },
  special: { emoji: '✨', name: 'Special', description: 'Limited edition items' }
};

module.exports = {
  data: new SlashCommandBuilder()
    .setName('shop')
    .setDescription('Browse and purchase items with your XP')
    .addSubcommand(sub =>
      sub.setName('browse')
        .setDescription('Browse available items')
        .addStringOption(opt =>
          opt.setName('category')
            .setDescription('Filter by category')
            .setRequired(false)
            .addChoices(
              { name: '🏅 Badges', value: 'badge' },
              { name: '🏷️ Titles', value: 'title' },
              { name: '🎨 Backgrounds', value: 'background' },
              { name: '⚡ Boosters', value: 'booster' },
              { name: '👑 Roles', value: 'role' },
              { name: '✨ Special', value: 'special' }
            )
        )
    )
    .addSubcommand(sub =>
      sub.setName('buy')
        .setDescription('Purchase an item')
        .addIntegerOption(opt =>
          opt.setName('item_id')
            .setDescription('The ID of the item to purchase')
            .setRequired(true)
        )
    )
    .addSubcommand(sub =>
      sub.setName('inventory')
        .setDescription('View your purchased items')
    )
    .addSubcommand(sub =>
      sub.setName('equip')
        .setDescription('Equip an item from your inventory')
        .addIntegerOption(opt =>
          opt.setName('item_id')
            .setDescription('The ID of the item to equip')
            .setRequired(true)
        )
    )
    .addSubcommand(sub =>
      sub.setName('balance')
        .setDescription('Check your XP balance')
    ),

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

    const subcommand = interaction.options.getSubcommand();

    switch (subcommand) {
      case 'browse':
        return handleBrowse(interaction, supabase);
      case 'buy':
        return handleBuy(interaction, supabase);
      case 'inventory':
        return handleInventory(interaction, supabase);
      case 'equip':
        return handleEquip(interaction, supabase);
      case 'balance':
        return handleBalance(interaction, supabase);
    }
  }
};

async function getUserLink(supabase, discordId) {
  const { data } = await supabase
    .from('discord_links')
    .select('user_id')
    .eq('discord_id', discordId)
    .maybeSingle();
  return data;
}

async function getUserBalance(supabase, userId, guildId) {
  const { data } = await supabase
    .from('user_balance')
    .select('*')
    .eq('user_id', userId)
    .eq('guild_id', guildId)
    .maybeSingle();
  
  if (!data) {
    const { data: profile } = await supabase
      .from('user_profiles')
      .select('xp, total_xp_earned')
      .eq('id', userId)
      .maybeSingle();
    
    const totalEarned = profile?.total_xp_earned || profile?.xp || 0;
    
    await supabase
      .from('user_balance')
      .insert({ user_id: userId, guild_id: guildId, balance: totalEarned, total_earned: totalEarned });
    
    return { balance: totalEarned, total_spent: 0, total_earned: totalEarned };
  }
  
  return data;
}

async function syncBalanceWithXP(supabase, userId, guildId) {
  const { data: profile } = await supabase
    .from('user_profiles')
    .select('xp, total_xp_earned')
    .eq('id', userId)
    .maybeSingle();
  
  const totalXpEarned = profile?.total_xp_earned || profile?.xp || 0;
  
  const { data: balance } = await supabase
    .from('user_balance')
    .select('*')
    .eq('user_id', userId)
    .eq('guild_id', guildId)
    .maybeSingle();
  
  if (balance) {
    const newBalance = totalXpEarned - balance.total_spent;
    await supabase
      .from('user_balance')
      .update({ balance: Math.max(0, newBalance), total_earned: totalXpEarned, updated_at: new Date().toISOString() })
      .eq('user_id', userId)
      .eq('guild_id', guildId);
    return { balance: Math.max(0, newBalance), total_spent: balance.total_spent, total_earned: totalXpEarned };
  } else {
    await supabase
      .from('user_balance')
      .insert({ user_id: userId, guild_id: guildId, balance: totalXpEarned, total_earned: totalXpEarned });
    return { balance: totalXpEarned, total_spent: 0, total_earned: totalXpEarned };
  }
}

async function handleBrowse(interaction, supabase) {
  await interaction.deferReply();
  
  const guildId = interaction.guildId;
  const category = interaction.options.getString('category');
  
  let query = supabase
    .from('shop_items')
    .select('*')
    .eq('guild_id', guildId)
    .eq('enabled', true)
    .order('item_type')
    .order('price');
  
  if (category) {
    query = query.eq('item_type', category);
  }
  
  const { data: items, error } = await query;
  
  if (error || !items || items.length === 0) {
    const embed = new EmbedBuilder()
      .setColor(0xfbbf24)
      .setTitle('🛒 Shop')
      .setDescription(category 
        ? `No items available in the **${CATEGORY_INFO[category]?.name || category}** category.`
        : 'No items available in the shop yet!\n\nAsk a server admin to add items with `/shop-manage add`.')
      .setTimestamp();
    
    return interaction.editReply({ embeds: [embed] });
  }
  
  const link = await getUserLink(supabase, interaction.user.id);
  let balanceInfo = null;
  if (link) {
    balanceInfo = await syncBalanceWithXP(supabase, link.user_id, guildId);
  }
  
  const groupedItems = {};
  for (const item of items) {
    const cat = item.item_type || 'other';
    if (!groupedItems[cat]) groupedItems[cat] = [];
    groupedItems[cat].push(item);
  }
  
  const embed = new EmbedBuilder()
    .setColor(0x7c3aed)
    .setTitle('🛒 AeThex Shop')
    .setDescription(balanceInfo 
      ? `Your Balance: **${balanceInfo.balance.toLocaleString()} XP** 💰`
      : 'Link your account with `/verify` to purchase items!')
    .setThumbnail(interaction.guild.iconURL({ size: 128 }))
    .setFooter({ text: `Use /shop buy <item_id> to purchase • ${items.length} items available` })
    .setTimestamp();
  
  for (const [cat, catItems] of Object.entries(groupedItems)) {
    const catInfo = CATEGORY_INFO[cat] || { emoji: '📦', name: cat };
    const itemList = catItems.slice(0, 5).map(item => {
      const stockInfo = item.stock !== null ? ` (${item.stock} left)` : '';
      const reqInfo = [];
      if (item.level_required > 0) reqInfo.push(`Lvl ${item.level_required}`);
      if (item.prestige_required > 0) reqInfo.push(`P${item.prestige_required}`);
      const reqStr = reqInfo.length > 0 ? ` [${reqInfo.join(', ')}]` : '';
      return `\`#${item.id}\` **${item.name}** - ${item.price.toLocaleString()} XP${stockInfo}${reqStr}`;
    }).join('\n');
    
    const moreItems = catItems.length > 5 ? `\n*...and ${catItems.length - 5} more*` : '';
    
    embed.addFields({
      name: `${catInfo.emoji} ${catInfo.name}`,
      value: itemList + moreItems,
      inline: false
    });
  }
  
  await interaction.editReply({ embeds: [embed] });
}

async function handleBuy(interaction, supabase) {
  await interaction.deferReply({ ephemeral: true });
  
  const guildId = interaction.guildId;
  const itemId = interaction.options.getInteger('item_id');
  
  const link = await getUserLink(supabase, interaction.user.id);
  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: item, error: itemError } = await supabase
    .from('shop_items')
    .select('*')
    .eq('id', itemId)
    .eq('guild_id', guildId)
    .eq('enabled', true)
    .maybeSingle();
  
  if (itemError || !item) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xff6b6b)
          .setDescription('Item not found or no longer available.')
      ]
    });
  }
  
  const { data: profile } = await supabase
    .from('user_profiles')
    .select('xp, prestige_level')
    .eq('id', link.user_id)
    .maybeSingle();
  
  const currentLevel = Math.floor(Math.sqrt((profile?.xp || 0) / 100));
  const prestige = profile?.prestige_level || 0;
  
  if (item.level_required > 0 && currentLevel < item.level_required) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xff6b6b)
          .setTitle('❌ Level Requirement Not Met')
          .setDescription(`You need to be **Level ${item.level_required}** to purchase this item.\nYour current level: **${currentLevel}**`)
      ]
    });
  }
  
  if (item.prestige_required > 0 && prestige < item.prestige_required) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xff6b6b)
          .setTitle('❌ Prestige Requirement Not Met')
          .setDescription(`You need to be **Prestige ${item.prestige_required}** to purchase this item.\nYour current prestige: **${prestige}**`)
      ]
    });
  }
  
  if (item.role_required) {
    if (!interaction.member.roles.cache.has(item.role_required)) {
      return interaction.editReply({
        embeds: [
          new EmbedBuilder()
            .setColor(0xff6b6b)
            .setTitle('❌ Role Requirement Not Met')
            .setDescription(`You need a specific role to purchase this item.`)
        ]
      });
    }
  }
  
  const { data: existingItem } = await supabase
    .from('user_inventory')
    .select('*')
    .eq('user_id', link.user_id)
    .eq('guild_id', guildId)
    .eq('item_id', itemId)
    .maybeSingle();
  
  if (existingItem && item.item_type !== 'booster') {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xfbbf24)
          .setTitle('Already Owned')
          .setDescription(`You already own **${item.name}**!`)
      ]
    });
  }
  
  if (item.stock !== null && item.stock <= 0) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xff6b6b)
          .setTitle('Out of Stock')
          .setDescription(`**${item.name}** is currently out of stock.`)
      ]
    });
  }
  
  const balance = await syncBalanceWithXP(supabase, link.user_id, guildId);
  
  if (balance.balance < item.price) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xff6b6b)
          .setTitle('💸 Insufficient XP')
          .setDescription(`You need **${item.price.toLocaleString()} XP** to purchase this item.\nYour balance: **${balance.balance.toLocaleString()} XP**\nYou need **${(item.price - balance.balance).toLocaleString()}** more XP!`)
      ]
    });
  }
  
  const newBalance = balance.balance - item.price;
  const newTotalSpent = (balance.total_spent || 0) + item.price;
  
  await supabase
    .from('user_balance')
    .update({ balance: newBalance, total_spent: newTotalSpent, updated_at: new Date().toISOString() })
    .eq('user_id', link.user_id)
    .eq('guild_id', guildId);
  
  let expiresAt = null;
  if (item.item_type === 'booster' && item.item_data?.duration_hours) {
    expiresAt = new Date(Date.now() + item.item_data.duration_hours * 60 * 60 * 1000).toISOString();
  }
  
  if (existingItem && item.item_type === 'booster') {
    await supabase
      .from('user_inventory')
      .update({ quantity: existingItem.quantity + 1, purchased_at: new Date().toISOString(), expires_at: expiresAt })
      .eq('id', existingItem.id);
  } else {
    await supabase
      .from('user_inventory')
      .insert({
        user_id: link.user_id,
        guild_id: guildId,
        item_id: itemId,
        quantity: 1,
        expires_at: expiresAt
      });
  }
  
  if (item.stock !== null) {
    await supabase
      .from('shop_items')
      .update({ stock: item.stock - 1 })
      .eq('id', itemId);
  }
  
  if (item.item_type === 'role' && item.item_data?.role_id) {
    try {
      await interaction.member.roles.add(item.item_data.role_id);
    } catch (e) {
      console.error('Failed to add role:', e.message);
    }
  }
  
  const embed = new EmbedBuilder()
    .setColor(0x00ff00)
    .setTitle('✅ Purchase Successful!')
    .setDescription(`You purchased **${item.name}**!`)
    .addFields(
      { name: 'Price Paid', value: `${item.price.toLocaleString()} XP`, inline: true },
      { name: 'New Balance', value: `${newBalance.toLocaleString()} XP`, inline: true }
    )
    .setTimestamp();
  
  if (expiresAt) {
    embed.addFields({ name: '⏰ Expires', value: `<t:${Math.floor(new Date(expiresAt).getTime() / 1000)}:R>`, inline: true });
  }
  
  if (item.item_type === 'badge' || item.item_type === 'title' || item.item_type === 'background') {
    embed.setFooter({ text: 'Use /shop equip to equip this item!' });
  }
  
  await interaction.editReply({ embeds: [embed] });
}

async function handleInventory(interaction, supabase) {
  await interaction.deferReply();
  
  const guildId = interaction.guildId;
  
  const link = await getUserLink(supabase, interaction.user.id);
  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: inventory, error } = await supabase
    .from('user_inventory')
    .select('*, shop_items(*)')
    .eq('user_id', link.user_id)
    .eq('guild_id', guildId);
  
  if (error || !inventory || inventory.length === 0) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xfbbf24)
          .setTitle('🎒 Your Inventory')
          .setDescription('Your inventory is empty!\n\nBrowse the shop with `/shop browse` to find items.')
      ]
    });
  }
  
  const now = new Date();
  const validItems = inventory.filter(inv => {
    if (inv.expires_at && new Date(inv.expires_at) < now) return false;
    return inv.shop_items;
  });
  
  if (validItems.length === 0) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xfbbf24)
          .setTitle('🎒 Your Inventory')
          .setDescription('Your inventory is empty or all items have expired!')
      ]
    });
  }
  
  const groupedItems = {};
  for (const inv of validItems) {
    const cat = inv.shop_items.item_type || 'other';
    if (!groupedItems[cat]) groupedItems[cat] = [];
    groupedItems[cat].push(inv);
  }
  
  const embed = new EmbedBuilder()
    .setColor(0x7c3aed)
    .setTitle('🎒 Your Inventory')
    .setDescription(`You own **${validItems.length}** items`)
    .setThumbnail(interaction.user.displayAvatarURL({ size: 128 }))
    .setFooter({ text: 'Use /shop equip <item_id> to equip items' })
    .setTimestamp();
  
  for (const [cat, catItems] of Object.entries(groupedItems)) {
    const catInfo = CATEGORY_INFO[cat] || { emoji: '📦', name: cat };
    const itemList = catItems.map(inv => {
      const item = inv.shop_items;
      const equipped = inv.equipped ? ' ✅' : '';
      const qty = inv.quantity > 1 ? ` x${inv.quantity}` : '';
      const expires = inv.expires_at ? ` (expires <t:${Math.floor(new Date(inv.expires_at).getTime() / 1000)}:R>)` : '';
      return `\`#${item.id}\` **${item.name}**${qty}${equipped}${expires}`;
    }).join('\n');
    
    embed.addFields({
      name: `${catInfo.emoji} ${catInfo.name}`,
      value: itemList,
      inline: false
    });
  }
  
  await interaction.editReply({ embeds: [embed] });
}

async function handleEquip(interaction, supabase) {
  await interaction.deferReply({ ephemeral: true });
  
  const guildId = interaction.guildId;
  const itemId = interaction.options.getInteger('item_id');
  
  const link = await getUserLink(supabase, interaction.user.id);
  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: invItem, error } = await supabase
    .from('user_inventory')
    .select('*, shop_items(*)')
    .eq('user_id', link.user_id)
    .eq('guild_id', guildId)
    .eq('item_id', itemId)
    .maybeSingle();
  
  if (error || !invItem) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xff6b6b)
          .setDescription('You don\'t own this item!')
      ]
    });
  }
  
  if (invItem.expires_at && new Date(invItem.expires_at) < new Date()) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xff6b6b)
          .setDescription('This item has expired!')
      ]
    });
  }
  
  const itemType = invItem.shop_items.item_type;
  if (!['badge', 'title', 'background'].includes(itemType)) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xfbbf24)
          .setDescription('This item type cannot be equipped.')
      ]
    });
  }
  
  await supabase
    .from('user_inventory')
    .update({ equipped: false })
    .eq('user_id', link.user_id)
    .eq('guild_id', guildId)
    .in('item_id', 
      (await supabase
        .from('shop_items')
        .select('id')
        .eq('guild_id', guildId)
        .eq('item_type', itemType)
      ).data?.map(i => i.id) || []
    );
  
  const newEquipped = !invItem.equipped;
  await supabase
    .from('user_inventory')
    .update({ equipped: newEquipped })
    .eq('id', invItem.id);
  
  const embed = new EmbedBuilder()
    .setColor(0x00ff00)
    .setTitle(newEquipped ? '✅ Item Equipped!' : '❌ Item Unequipped')
    .setDescription(`**${invItem.shop_items.name}** has been ${newEquipped ? 'equipped' : 'unequipped'}.`)
    .setTimestamp();
  
  await interaction.editReply({ embeds: [embed] });
}

async function handleBalance(interaction, supabase) {
  await interaction.deferReply();
  
  const guildId = interaction.guildId;
  
  const link = await getUserLink(supabase, interaction.user.id);
  if (!link) {
    return interaction.editReply({
      embeds: [
        new EmbedBuilder()
          .setColor(0xff6b6b)
          .setDescription('You need to link your account first! Use `/verify` to get started.')
      ]
    });
  }
  
  const balance = await syncBalanceWithXP(supabase, link.user_id, guildId);
  
  const { data: profile } = await supabase
    .from('user_profiles')
    .select('xp, prestige_level')
    .eq('id', link.user_id)
    .maybeSingle();
  
  const level = Math.floor(Math.sqrt((profile?.xp || 0) / 100));
  const prestige = profile?.prestige_level || 0;
  
  const embed = new EmbedBuilder()
    .setColor(0x7c3aed)
    .setTitle('💰 Your Balance')
    .setThumbnail(interaction.user.displayAvatarURL({ size: 128 }))
    .addFields(
      { name: '💵 Available XP', value: `**${balance.balance.toLocaleString()}** XP`, inline: true },
      { name: '📈 Total Earned', value: `${balance.total_earned.toLocaleString()} XP`, inline: true },
      { name: '🛒 Total Spent', value: `${balance.total_spent.toLocaleString()} XP`, inline: true },
      { name: '📊 Level', value: `${level}${prestige > 0 ? ` (P${prestige})` : ''}`, inline: true }
    )
    .setFooter({ text: 'Earn XP by chatting, reacting, and joining voice!' })
    .setTimestamp();
  
  await interaction.editReply({ embeds: [embed] });
}