import { ISMSSender } from '../../interfaces/smsSender.interface';
import { Twilio } from 'twilio';
import { USERNAME, PASSWORD, FROM } from '../../utils/constants';
import { MessageInstance } from 'twilio/lib/rest/api/v2010/account/message';
import { SendResult } from '../../types/sendResult.type';
import { NotProvidedCredentialsError } from '../../errors';

export default class TwilioSMSSenderClient implements ISMSSender {
    private client: Twilio;
    constructor() {
        if (USERNAME && PASSWORD && FROM)
            this.client = new Twilio(USERNAME, PASSWORD);
        else throw new NotProvidedCredentialsError();
    }

    public async send(
        phones: string[] = [],
        message: string,
    ): Promise<SendResult> {
        const result: SendResult = {
            sent: [],
            failed: [],
        };

        await Promise.all(
            phones.map((phone) =>
                this.sendOne(phone, message)
                    .then(() => result.sent.push({ phone }))
                    .catch((error) =>
                        result.failed.push({ phone, error: error.message }),
                    ),
            ),
        );

        return result;
    }

    private sendOne = (
        phone: string,
        message: string,
    ): Promise<MessageInstance> =>
        this.client.messages.create({
            from: FROM,
            to: phone,
            body: message,
        });
}