const {
  SlashCommandBuilder,
  EmbedBuilder,
  ActionRowBuilder,
  ButtonBuilder,
  ButtonStyle,
} = require("discord.js");
const { syncRolesAcrossGuilds } = require("../utils/roleManager");

async function checkAethexAvailability() {
  try {
    const controller = new AbortController();
    const timeoutId = setTimeout(() => controller.abort(), 5000);
    
    const response = await fetch('https://aethex.dev/api/health', {
      method: 'HEAD',
      signal: controller.signal
    }).catch(() => null);
    
    clearTimeout(timeoutId);
    return response && response.ok;
  } catch {
    return false;
  }
}

module.exports = {
  data: new SlashCommandBuilder()
    .setName("verify")
    .setDescription("Link your Discord account to your AeThex account"),

  async execute(interaction, supabase, client) {
    if (!supabase) {
      return interaction.reply({ content: "This feature requires Supabase to be configured.", ephemeral: true });
    }
    await interaction.deferReply({ ephemeral: true });

    try {
      // Check if aethex.dev is reachable
      const isAethexUp = await checkAethexAvailability();
      if (!isAethexUp) {
        const embed = new EmbedBuilder()
          .setColor(0xff9500)
          .setTitle("⚠️ Service Temporarily Unavailable")
          .setDescription("The AeThex verification service is currently unavailable.")
          .addFields(
            { name: "💡 What to do", value: "Please try again in a few minutes." },
            { name: "📊 Status", value: "Check [status.aethex.dev](https://status.aethex.dev) for updates." }
          );
        
        return await interaction.editReply({ embeds: [embed] });
      }

      const { data: existingLink } = await supabase
        .from("discord_links")
        .select("*")
        .eq("discord_id", interaction.user.id)
        .maybeSingle();

      if (existingLink) {
        const embed = new EmbedBuilder()
          .setColor(0x00ff00)
          .setTitle("✅ Already Linked")
          .setDescription(
            `Your Discord account is already linked to AeThex (User ID: ${existingLink.user_id})`,
          );

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

      // Generate verification code
      const verificationCode = Math.random()
        .toString(36)
        .substring(2, 8)
        .toUpperCase();
      const expiresAt = new Date(Date.now() + 15 * 60 * 1000); // 15 minutes

      // Store verification code with Discord username (upsert to prevent race condition)
      await supabase.from("discord_verifications").upsert({
        discord_id: interaction.user.id,
        verification_code: verificationCode,
        username: interaction.user.username,
        expires_at: expiresAt.toISOString(),
      }, { onConflict: 'discord_id' });

      const verifyUrl = `https://aethex.dev/discord-verify?code=${verificationCode}`;

      const embed = new EmbedBuilder()
        .setColor(0x7289da)
        .setTitle("🔗 Link Your AeThex Account")
        .setDescription(
          "Click the button below to link your Discord account to AeThex.",
        )
        .addFields(
          { name: "⏱️ Expires In", value: "15 minutes" },
          { name: "📝 Verification Code", value: `\`${verificationCode}\`` },
        )
        .setFooter({ text: "Your security code will expire in 15 minutes" });

      const row = new ActionRowBuilder().addComponents(
        new ButtonBuilder()
          .setLabel("Link Account")
          .setStyle(ButtonStyle.Link)
          .setURL(verifyUrl),
      );

      await interaction.editReply({ embeds: [embed], components: [row] });
    } catch (error) {
      console.error("Verify command error:", error);
      const embed = new EmbedBuilder()
        .setColor(0xff0000)
        .setTitle("❌ Error")
        .setDescription(
          "Failed to generate verification code. Please try again.",
        );

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