import { Message, TextChannel, PermissionFlagsBits } from 'discord.js';
import { WebhookService } from './WebhookService';
import { logger } from '../utils/logger';

export class MimicService {
  public static async handleMessage(message: Message) {
    if (message.author.bot) return;
    if (!(message.channel instanceof TextChannel)) return;

    let content = message.content;
    let modified = false;

    // Feature 1: Big Emoji
    // If message is exactly one custom discord emoji, we enlarge it.
    const customEmojiRegex = /^<a?:.+:(\d+)>$/i;
    const match = content.match(customEmojiRegex);
    
    if (match) {
      const emojiId = match[1];
      const isAnimated = content.startsWith('<a:');
      const ext = isAnimated ? 'gif' : 'png';
      const emojiUrl = `https://cdn.discordapp.com/emojis/${emojiId}.${ext}?size=256`;

      // Replace the emoji string with its raw image URL
      content = emojiUrl;
      modified = true;
    }

    // Feature 2: Prank / Word Mimic
    // Example logic replacing a keyword to alter user message
    if (content.includes('kord')) {
      content = content.replace(/kord/gi, 'Kord(최고존엄)');
      modified = true;
    }

    if (modified) {
      try {
        // Ensure we have permissions to manage webhooks and messages
        const me = message.guild?.members.me;
        if (!me?.permissionsIn(message.channel).has(PermissionFlagsBits.ManageWebhooks)) {
          logger.warn(`Missing ManageWebhooks in ${message.channel.id}`);
          return; // Can't send mimic
        }

        const webhookClient = await WebhookService.getWebhookClient(message.channel);
        if (webhookClient) {
          // Send modified message copying the user's name and avatar
          await webhookClient.send({
            content,
            username: message.member?.displayName || message.author.username,
            avatarURL: message.author.displayAvatarURL(),
          });
          
          // Delete the original message silently
          if (message.deletable) {
            await message.delete();
          }
        }
      } catch (error) {
        logger.error(`MimicService Error:`, error);
      }
    }
  }
}