const { REST, Routes } = require("discord.js");
const fs = require("fs");
const path = require("path");
require("dotenv").config();

// Validate environment variables
const requiredEnvVars = [
  "DISCORD_BOT_TOKEN",
  "DISCORD_CLIENT_ID",
];

const missingVars = requiredEnvVars.filter((envVar) => !process.env[envVar]);
if (missingVars.length > 0) {
  console.error(
    "❌ FATAL ERROR: Missing required environment variables:",
    missingVars.join(", ")
  );
  console.error("\nPlease set these before running command registration:");
  missingVars.forEach((envVar) => {
    console.error(`  - ${envVar}`);
  });
  process.exit(1);
}

// Load commands from commands directory
const commandsPath = path.join(__dirname, "../commands");
const commandFiles = fs
  .readdirSync(commandsPath)
  .filter((file) => file.endsWith(".js"));

const commands = [];

for (const file of commandFiles) {
  const filePath = path.join(commandsPath, file);
  const command = require(filePath);
  if ("data" in command && "execute" in command) {
    commands.push(command.data.toJSON());
    console.log(`✅ Loaded command: ${command.data.name}`);
  }
}

// Register commands with Discord API
async function registerCommands() {
  try {
    const rest = new REST({ version: "10" }).setToken(
      process.env.DISCORD_BOT_TOKEN
    );

    console.log(`\n📝 Registering ${commands.length} slash commands...`);
    console.log("⚠️  This will co-exist with Discord's auto-generated Entry Point command.\n");

    try {
      const data = await rest.put(
        Routes.applicationCommands(process.env.DISCORD_CLIENT_ID),
        { body: commands }
      );
      console.log(`✅ Successfully registered ${data.length} slash commands.`);
      console.log("\n🎉 Command registration complete!");
      console.log("ℹ️  Your commands are now live in Discord.");
      console.log("ℹ️  The Entry Point command (for Activities) will be managed by Discord.\n");
    } catch (error) {
      // Handle Entry Point command conflict
      if (error.code === 50240) {
        console.warn(
          "⚠️  Error 50240: Entry Point command detected (Discord Activity enabled)."
        );
        console.warn("Registering commands individually...\n");
        
        let successCount = 0;
        for (const command of commands) {
          try {
            await rest.post(
              Routes.applicationCommands(process.env.DISCORD_CLIENT_ID),
              { body: command }
            );
            successCount++;
          } catch (postError) {
            if (postError.code === 50045) {
              console.warn(`  ⚠️  ${command.name}: Already registered (skipping)`);
            } else {
              console.error(`  ❌ ${command.name}: ${postError.message}`);
            }
          }
        }
        
        console.log(`\n✅ Registered ${successCount} slash commands (individual mode).`);
        console.log("🎉 Command registration complete!");
        console.log("ℹ️  The Entry Point command will be managed by Discord.\n");
      } else {
        throw error;
      }
    }
  } catch (error) {
    console.error("❌ Fatal error registering commands:", error.message || error);
    process.exit(1);
  }
}

// Run registration
registerCommands();