import { UnknownProviderError } from '../errors';
import { ISMSSender } from '../interfaces';
import { SMSProviderModule } from '../types';
import { SMS_PROVIDER } from '../utils/constants';
import { getSMSProviderFromPlatformCloud } from '../mappers/qrveyEnvs.mapper';

export class SMSSenderFactory {
    private static providerModules: Record<
        string,
        () => Promise<SMSProviderModule>
    > = {
        twilio: () => import('./clients/twilioSmsSender.client'),
        aws: () => import('./clients/awsSmsSender.client'),
        azure: () => import('./clients/azureSmsSender.client'),
        vonage: () => import('./clients/vonageSmsSender.client'),
    };
    private static _smsSender: ISMSSender | null = null;

    static async getSMSSender(): Promise<ISMSSender> {
        const provider =
            getSMSProviderFromPlatformCloud() ?? SMS_PROVIDER?.toLowerCase();
        if (!provider) throw new UnknownProviderError();
        if (!this.providerModules[provider]) throw new UnknownProviderError();

        const { default: SMSSender } = await this.providerModules[provider]();
        this._smsSender = this._smsSender ?? new SMSSender();
        return this._smsSender;
    }
}