import fs from 'fs';
import path from 'path';
import { Client } from 'discord.js';
import { EventHandler } from '../utils/types';
import { logger } from '../utils/logger';
import { context } from '../config/context';

export class EventHandlerService {
  constructor(private client: Client) {}

  public async loadEvents() {
    const eventsPath = path.join(process.cwd(), 'src', 'events');
    const files = this.walk(eventsPath);
    for (const file of files) {
      const mod = await import(file);
      const event: EventHandler = mod.default;
      if (!event?.name || !event.execute) continue;
      if (event.once) {
        this.client.once(event.name, (...args) => {
          this.track(event.name, args);
          event.execute(...args);
        });
      } else {
        this.client.on(event.name, (...args) => {
          this.track(event.name, args);
          event.execute(...args);
        });
      }
      logger.info(`Bound event ${event.name}`);
    }
  }

  private walk(dir: string): string[] {
    const entries = fs.readdirSync(dir, { withFileTypes: true });
    const files: string[] = [];
    for (const entry of entries) {
      const res = path.resolve(dir, entry.name);
      if (entry.isDirectory()) files.push(...this.walk(res));
      else if (entry.isFile() && (entry.name.endsWith('.ts') || entry.name.endsWith('.js'))) files.push(res);
    }
    return files;
  }

  private track(name: string, args: any[]) {
    try {
      const guildId =
        (args[0]?.guild?.id as string | undefined) ||
        (args[0]?.guildId as string | undefined) ||
        (args[0]?.message?.guildId as string | undefined);
      context.admin.trackEvent(name, guildId);
    } catch {
      /* ignore */
    }
  }
}