import https from 'https';
import logger from '../utils/logger.js';
import { config } from '../config/index.js';

export class Notifier {
    private isNotificationEnabled: boolean = true;
    private readonly phoneNumbers: string[] = config.NOTIFICATION_PHONE_NUMBERS.length > 0
        ? config.NOTIFICATION_PHONE_NUMBERS
        : []; // No default — must be configured via NOTIFICATION_PHONE_NUMBERS env var

    /**
     * Sets the notification status.
     * @param status - True to enable, false to disable.
     */
    public setNotificationStatus(status: boolean): void {
        this.isNotificationEnabled = status;
        logger.info(`[Notifier] WhatsApp notifications are now ${status ? 'ENABLED' : 'DISABLED'}`);
    }

    /**
     * Gets the current notification status.
     */
    public getNotificationStatus(): boolean {
        return this.isNotificationEnabled;
    }

    /**
     * Sends a WhatsApp message to all configured recipients.
     * @param message - The content to send.
     */
    public async sendAlert(message: string): Promise<void> {
        if (!this.isNotificationEnabled) {
            logger.info(`[Notifier] Notifications disabled. Skipping message: ${message.substring(0, 30)}...`);
            return;
        }

        if (this.phoneNumbers.length === 0) {
            logger.warn(`[Notifier] No phone numbers configured (set NOTIFICATION_PHONE_NUMBERS env var). Skipping.`);
            return;
        }

        const sendPromises = this.phoneNumbers.map(number => this.sendSingleWhatsAppMessage(number, message));

        try {
            await Promise.all(sendPromises);
            logger.info(`[Notifier] Alerts broadcasted to ${this.phoneNumbers.length} recipients.`);
        } catch (error) {
            logger.error('[Notifier] Broadcast failed partially/fully.');
        }
    }

    /**
     * Sends a WhatsApp message to a specific number using ZenHustles API.
     */
    private sendSingleWhatsAppMessage(to: string, message: string): Promise<any> {
        return new Promise((resolve, reject) => {
            const data = JSON.stringify({
                message: message,
                toWhatsAppNumber: to
            });

            const options = {
                hostname: config.NOTIFICATION_API_HOST,
                port: 443,
                path: config.NOTIFICATION_API_PATH,
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'Content-Length': Buffer.byteLength(data)
                }
            };

            const req = https.request(options, (res) => {
                let responseBody = '';

                res.on('data', (chunk) => {
                    responseBody += chunk;
                });

                res.on('end', () => {
                    if (res.statusCode && res.statusCode >= 200 && res.statusCode < 300) {
                        try {
                            const parsed = JSON.parse(responseBody);
                            logger.info(`[Notifier] Successfully sent to ${to}`);
                            resolve(parsed);
                        } catch (e) {
                            logger.info(`[Notifier] Successfully sent to ${to} (Non-JSON response)`);
                            resolve(responseBody);
                        }
                    } else {
                        logger.error(`[Notifier] Failed for ${to}. Status: ${res.statusCode}, Body: ${responseBody}`);
                        reject(new Error(`Status ${res.statusCode}`));
                    }
                });
            });

            req.on('error', (error) => {
                logger.error(`[Notifier] Network error for ${to}: ${error.message}`);
                reject(error);
            });

            req.write(data);
            req.end();
        });
    }
}