/**
 * Ready Event Handler
 * Handles bot initialization when connected to Discord
 */

import { Events, REST, Routes } from 'discord.js';
import type { EllyClient } from '../client/EllyClient.ts';
import type { BotEvent } from '../types/index.ts';

export const readyEvent: BotEvent = {
  name: Events.ClientReady,
  once: true,

  async execute(client: EllyClient): Promise<void> {
    console.log('');
    client.logger.info('═══════════════════════════════════════════════════════');
    client.logger.info('                    BOT CONNECTED                       ');
    client.logger.info('═══════════════════════════════════════════════════════');
    client.logger.info(`✓ Logged in as: ${client.user?.tag}`);
    client.logger.info(`  ├─ User ID: ${client.user?.id}`);
    client.logger.info(`  ├─ Guilds: ${client.guilds.cache.size}`);
    client.logger.info(`  └─ Users: ${client.users.cache.size} cached`);

    // Register slash commands
    await registerCommands(client);

    console.log('');
    client.logger.info('═══════════════════════════════════════════════════════');
    client.logger.info('               ELLY IS NOW ONLINE                      ');
    client.logger.info('═══════════════════════════════════════════════════════');
    console.log('');
  },
};

/**
 * Register slash commands with Discord
 */
async function registerCommands(client: EllyClient): Promise<void> {
  const token = Deno.env.get('DISCORD_TOKEN');
  if (!token || !client.user) {
    client.logger.error('✗ Cannot register commands: missing token or client user');
    return;
  }

  const rest = new REST({ version: '10' }).setToken(token);
  const commands = client.commands.map((cmd) => cmd.data.toJSON());

  console.log('');
  client.logger.info('───────────────────────────────────────────────────────');
  client.logger.info('              SLASH COMMAND REGISTRATION               ');
  client.logger.info('───────────────────────────────────────────────────────');

  try {
    client.logger.info(`Preparing to sync ${commands.length} slash commands...`);

    // List all commands being registered
    const commandsByCategory: Record<string, string[]> = {};
    for (const cmd of client.commands.values()) {
      const category = cmd.data.name.includes('bedwars') || cmd.data.name.includes('skywars') || cmd.data.name === 'guild'
        ? 'Statistics'
        : cmd.data.name.includes('marry') || cmd.data.name.includes('divorce') || cmd.data.name === 'relationship'
        ? 'Family'
        : cmd.data.name === 'remind' || cmd.data.name === 'away'
        ? 'Utility'
        : cmd.data.name === 'purge'
        ? 'Moderation'
        : 'Developer';
      
      if (!commandsByCategory[category]) {
        commandsByCategory[category] = [];
      }
      commandsByCategory[category].push(`/${cmd.data.name}`);
    }

    for (const [category, cmds] of Object.entries(commandsByCategory)) {
      client.logger.info(`  📁 ${category}: ${cmds.join(', ')}`);
    }

    // Register to specific guild for faster updates during development
    if (client.config.guild.id) {
      client.logger.info('');
      client.logger.info(`Syncing to guild: ${client.config.guild.name}`);
      client.logger.info(`  ├─ Guild ID: ${client.config.guild.id}`);
      client.logger.info(`  ├─ Mode: Guild-specific (instant updates)`);
      client.logger.info(`  └─ Syncing...`);

      const startTime = Date.now();
      await rest.put(Routes.applicationGuildCommands(client.user.id, client.config.guild.id), {
        body: commands,
      });
      const elapsed = Date.now() - startTime;

      client.logger.info('');
      client.logger.info(`✓ Successfully synced ${commands.length} commands to guild!`);
      client.logger.info(`  ├─ Time: ${elapsed}ms`);
      client.logger.info(`  ├─ Guild: ${client.config.guild.name}`);
      client.logger.info(`  └─ Commands are available immediately`);
    } else {
      client.logger.info('');
      client.logger.info('Syncing globally (no guild ID configured)');
      client.logger.info('  ├─ Mode: Global (may take up to 1 hour)');
      client.logger.info('  └─ Syncing...');

      const startTime = Date.now();
      await rest.put(Routes.applicationCommands(client.user.id), {
        body: commands,
      });
      const elapsed = Date.now() - startTime;

      client.logger.info('');
      client.logger.info(`✓ Successfully synced ${commands.length} commands globally!`);
      client.logger.info(`  ├─ Time: ${elapsed}ms`);
      client.logger.info(`  └─ Note: Global commands may take up to 1 hour to appear`);
    }
  } catch (error) {
    client.logger.error('✗ Failed to register commands');
    client.logger.error(`  └─ Error: ${error instanceof Error ? error.message : String(error)}`);
  }
}