Create service for sending automated status emails

Author: janekhuong

services/automatedEmails.service.js

@@ -0,0 +1,60 @@
+"use strict";
+
+const Services = {
+    Email: require("./email.service"),
+    Hacker: require("./hacker.service"),
+    Logger: require("./logger.service"),
+};
+
+const TAG = "[AutomatedEmail.Service]";
+
+class AutomatedEmailService {
+    /**
+     * Send status emails to all hackers with the given status
+     * @param {string} status - "Accepted", "Declined"
+     * @returns {Promise<{success: number, failed: number}>} Number of successful and failed emails
+     */
+    async sendAutomatedStatusEmails(status) {
+        const results = { success: 0, failed: 0 };
+        try {
+            // Get all hackers with the specified status
+            const hackers = await Services.Hacker.findByStatus(status);
+
+            // Send emails in parallel
+            const emailPromises = hackers.map(async (hacker) => {
+                try {
+                    await new Promise((resolve, reject) => {
+                        Services.Email.sendStatusUpdate(
+                            hacker.accountId.firstName,
+                            hacker.accountId.email,
+                            status,
+                            (err) => {
+                                if (err) {
+                                    reject(err);
+                                } else {
+                                    resolve();
+                                }
+                            },
+                        );
+                    });
+                    results.success++;
+                } catch (err) {
+                    Services.Logger.error(
+                        `${TAG} Failed to send ${status} email to ${hacker.accountId.email}: ${err}`,
+                    );
+                    results.failed++;
+                }
+            });
+
+            await Promise.all(emailPromises);
+            return results;
+        } catch (err) {
+            Services.Logger.error(
+                `${TAG} Error in sendAutomatedStatusEmails: ${err}`,
+            );
+            throw err;
+        }
+    }
+}
+
+module.exports = new AutomatedEmailService();