import { Injectable, Logger, NotFoundException } from "@nestjs/common";
import { EmailNotificationStrategy } from "./strategies/notification.email.strategy";
import { NotificationStrategy } from "./strategies/notification.strategy";
import { SmsNotificationStrategy } from "./strategies/notification.sms.strategy";



type StrategyMethod = "sms" | "email"
@Injectable()
export class NotificationsService {
  private readonly logger = new Logger(NotificationsService.name);
  private readonly strategies: Map<StrategyMethod, NotificationStrategy>
  constructor(private readonly email: EmailNotificationStrategy, private readonly sms: SmsNotificationStrategy) {
    this.strategies = new Map([
      ["sms", this.sms as NotificationStrategy],
      ["email", this.email as NotificationStrategy]
    ])
  }

  /**
   * Dispatch a notification to an operator or customer.
   * TODO: wire to email/SMS provider (SendGrid, SMS API, etc.) via a mailer service.
   */

  async directSend(method: StrategyMethod, recipient: string, message: string) {
    const strategy = this.strategies.get(method);
    if (!strategy) {
      throw new NotFoundException();
    }
    const sent = await strategy.send(recipient, message)
    this.logger.log(`is sent - ${sent}`)
  }


}