import { Bun } from 'bun';
import { CommandService } from './services/command';
import { ResponseQueue } from './services/response-queue';

const PORT = 3007;

type WebhookPayload = {
  event: string;
  instance: string;
  data: any;
  // Other fields from Evolution API
};

export class WebhookServer {
  static async handleRequest(request: Request): Promise<Response> {
    // 1. Method validation
    if (request.method !== 'POST') {
      return new Response('Method not allowed', { status: 405 });
    }

    // 2. Content-Type validation
    const contentType = request.headers.get('content-type');
    if (!contentType?.includes('application/json')) {
      return new Response('Invalid content type', { status: 400 });
    }

    try {
      // 3. Parse and validate payload
      const payload = await request.json() as WebhookPayload;
      
      if (!payload.event || !payload.instance) {
        return new Response('Invalid payload', { status: 400 });
      }

      // 4. Verify instance matches
      if (payload.instance !== process.env.INSTANCE_NAME) {
        return new Response('Invalid instance', { status: 403 });
      }

      // 5. Route events
      switch (payload.event) {
        case 'messages.upsert':
          await this.handleMessageUpsert(payload.data);
          break;
        // Other events will be added later
      }

      return new Response('OK', { status: 200 });
    } catch (error) {
      return new Response('Invalid request', { status: 400 });
    }
  }

  private static async handleMessageUpsert(data: any) {
    // Basic message validation
    if (!data?.key?.remoteJid || !data.message) return;

    // Forward to command service if applicable
    const messageText = data.message.conversation;
    if (messageText?.startsWith('/tarea')) {
      const responses = await CommandService.handle({
        sender: data.key.participant,
        groupId: data.key.remoteJid,
        message: messageText,
        mentions: data.contextInfo?.mentionedJid || []
      });
      
      // Queue responses for sending
      await ResponseQueue.add(responses);
    }
  }
}

  static start() {
    if (process.env.NODE_ENV !== 'test') {
      const server = Bun.serve({
        port: PORT,
        fetch: WebhookServer.handleRequest,
      });
      console.log(`Server running on port ${PORT}`);
      return server;
    }
  }