import { Injectable, Logger } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import axios from 'axios';
import { normalizeMobile } from '../common/mobile.util';

export type CentralSmsResult = {
  success: boolean;
  raw?: unknown;
  error?: string;
};

@Injectable()
export class CentralSmsService {
  private readonly logger = new Logger(CentralSmsService.name);

  constructor(private readonly config: ConfigService) {}

  async send(phone: string, text: string): Promise<CentralSmsResult> {
    const to = normalizeMobile(phone);
    const message = text.trim();

    if (!to) {
      return { success: false, error: 'شماره موبایل نامعتبر است' };
    }
    if (!message) {
      return { success: false, error: 'متن پیامک خالی است' };
    }

    const url =
      this.config.get<string>('CENTRAL_SMS_URL') ||
      'http://185.231.112.101/api/createsms';
    const secret = this.config.get<string>('CENTRAL_SMS_SECRET')?.trim();
    if (!secret) {
      this.logger.error('CENTRAL_SMS_SECRET is not configured');
      return { success: false, error: 'سرویس پیامک پیکربندی نشده است' };
    }
    const host =
      this.config.get<string>('CENTRAL_SMS_HOST') || 'superadmin';
    const platform =
      this.config.get<string>('CENTRAL_SMS_PLATFORM') || 'superadmin';

    try {
      const response = await axios.post(
        url,
        {
          phone: to,
          host,
          text: message,
          platform,
        },
        {
          timeout: 15000,
          headers: {
            'Content-Type': 'application/json',
            secret_key: secret,
          },
          // Prefer IPv4 like Hamkar curl CURLOPT_IPRESOLVE_V4
          family: 4,
          validateStatus: () => true,
        },
      );

      const body = response.data;
      let success = response.status >= 200 && response.status < 300;

      if (body && typeof body === 'object') {
        if (body.success === false || body.ok === false) success = false;
        const status = String(body.status ?? '').toLowerCase();
        if (['error', 'failed', 'fail'].includes(status)) success = false;
      }

      if (!success) {
        this.logger.warn(`Central SMS failed to ${to} (HTTP ${response.status})`);
      }

      return { success, raw: body };
    } catch (error: any) {
      const msg = error?.message || 'SMS send error';
      this.logger.error(`Central SMS exception to ${to}: ${msg}`);
      return { success: false, error: msg };
    }
  }
}