const { Client, GatewayIntentBits, EmbedBuilder } = require('discord.js');
require('dotenv').config();

/**
 * Sends a summary report of top AI-recommended items using a Discord Bot.
 * @param {Array} items - List of items with "Hãy mua" in their ai_suggestion.
 */
async function sendDiscordSummary(items) {
  const token = process.env.DISCORD_BOT_TOKEN;
  const channelId = process.env.DISCORD_CHANNEL_ID;

  if (!token || !channelId) {
    console.log('Discord Bot Token or Channel ID not configured in .env. Skipping notification.');
    return;
  }

  if (items.length === 0) {
    console.log('No top deals found to send to Discord.');
    return;
  }

  // Initialize Discord Client
  const client = new Client({ 
    intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMessages] 
  });

  try {
    // Login to Discord
    await client.login(token);
    
    // Fetch the target channel
    const channel = await client.channels.fetch(channelId);
    if (!channel || !channel.isTextBased()) {
      console.error('Discord channel not found or is not a text channel.');
      return;
    }

    // Sort and limit to top 10 deals
    const topItems = items
      .sort((a, b) => b.profit - a.profit)
      .slice(0, 10);

    const dashboardUrl = process.env.DASHBOARD_URL || 'https://logs1.danielvu.com/ebay-price-check';

    // Build embeds
    const embeds = topItems.map(item => {
      const embed = new EmbedBuilder()
        .setTitle(item.title)
        .setURL(item.url)
        .setDescription(`**AI Suggestion:** ${item.ai_suggestion}\n**Price:** $${item.price} | **Profit:** $${item.profit.toFixed(2)}`)
        .setColor(0x22C55E); // Green

      if (item.images && item.images.length > 0) {
        embed.setThumbnail(item.images[0]);
      }

      embed.addFields(
        { name: 'Part Number', value: item.partNumber || 'N/A', inline: true },
        { name: 'Manufacturer', value: item.manufacturer || 'N/A', inline: true }
      );

      return embed;
    });

    // Send the message
    await channel.send({
      content: `🚀 **eBay Deep Scan: Found ${items.length} top deals!**\nView all results here: ${dashboardUrl}`,
      embeds: embeds
    });

    console.log(`Successfully sent Discord Bot summary for ${topItems.length} items.`);
  } catch (err) {
    console.error('Error sending Discord Bot notification:', err.message);
  } finally {
    // Ensure client is destroyed after use
    client.destroy();
  }
}

module.exports = {
  sendDiscordSummary
};

// Standalone test block
if (require.main === module) {
  const testItems = [
    {
      id: "test-123",
      title: "Test RAM Module 16GB - DEBUG",
      url: "https://www.ebay.com/itm/123456",
      ai_suggestion: "Hãy mua ngay, đây là tin nhắn test từ hệ thống!",
      price: 45.00,
      profit: 15.00,
      partNumber: "TEST-PN-001",
      manufacturer: "TestBrand",
      images: ["https://via.placeholder.com/150"]
    }
  ];
  
  console.log("Running Discord notification test...");
  sendDiscordSummary(testItems).then(() => {
    console.log("Test finished.");
  }).catch(err => {
    console.error("Test failed:", err);
  });
}