import { onRequest } from "firebase-functions/v2/https";
import { Request } from "firebase-functions/v2/https";
import { getCorsHandler } from "../shared/middleware";
import { getLogger } from "../shared/config";
import twilio from 'twilio';

const corsHandler = getCorsHandler();
const logger = getLogger();

// Initialize Twilio client
const twilioClient = twilio(process.env.TWILIO_ACCOUNT_SID, process.env.TWILIO_AUTH_TOKEN);

interface SMSRequest {
    to: string;
    body: string;
}

export const sendSMSMessage = onRequest({
    region: '#{SERVICES_RGN}#'
}, async (request: Request, response) => {
    return corsHandler(request, response, async () => {
        try {
            const { to, body } = request.body as SMSRequest;

            // Input validation
            if (!to || !body) {
                logger.error('Missing required SMS parameters');
                response.status(400).json({
                    success: false,
                    error: 'Both "to" and "body" parameters are required'
                });
                return;
            }

            // Validate phone number format (basic check)
            if (!/^\+?[1-9]\d{1,14}$/.test(to)) {
                logger.error('Invalid phone number format', { to });
                response.status(400).json({
                    success: false,
                    error: 'Invalid phone number format'
                });
                return;
            }

            // Send SMS
            const message = await twilioClient.messages.create({
                body: body,
                from: process.env.TWILIO_PHONE_NUMBER,
                to: to
            });

            logger.info('SMS sent successfully', {
                messageId: message.sid,
                to: to,
                length: body.length
            });

            response.json({
                success: true,
                messageId: message.sid,
                timestamp: message.dateCreated
            });

        } catch (error: any) {
            logger.error('Error sending SMS:', error);

            const statusCode = error.status === 401 ? 401 : 500;

            response.status(statusCode).json({
                success: false,
                error: error.message,
                code: error.code,
                moreInfo: error.moreInfo
            });
        }
    });
});