import { Injectable } from '@nestjs/common';
import axios from 'axios';
import {
  IntegrationStrategy,
  IntegrationResult,
} from '../integration.strategy';

@Injectable()
export class WhatsAppStrategy implements IntegrationStrategy {
  async sendMessage(
    to: string,
    message: string,
    config: any,
  ): Promise<IntegrationResult> {
    try {
      const { accessToken, phoneNumberId, apiVersion = 'v17.0' } = config;

      const url = `https://graph.facebook.com/${apiVersion}/${phoneNumberId}/messages`;

      const payload = {
        messaging_product: 'whatsapp',
        to: to,
        type: 'text',
        text: {
          body: message,
        },
      };

      const response = await axios.post(url, payload, {
        headers: {
          Authorization: `Bearer ${accessToken}`,
          'Content-Type': 'application/json',
        },
      });

      return {
        success: true,
        provider: 'whatsapp',
        service: 'API',
        messageId: response.data.messages[0].id,
        timestamp: new Date(),
      };
    } catch (error) {
      return {
        success: false,
        provider: 'whatsapp',
        service: 'API',
        error: error.message,
        timestamp: new Date(),
      };
    }
  }

  validateConfig(config: any): boolean {
    return !!(config.accessToken && config.phoneNumberId);
  }
}