src/services/notification.service.js

const client = require('../bot/index');

// QUEUE SYSTEM FOR DISCORD RATE LIMITS (Max 1 msg per 500ms)
const messageQueue = [];
let isProcessingQueue = false;

setInterval(async () => {
    if (messageQueue.length === 0 || isProcessingQueue) return;
    isProcessingQueue = true;
    
    const task = messageQueue.shift();
    try {
        const user = await client.users.fetch(task.discordId);
        if (user) {
            await user.send(task.message);
        } else {
            console.log(`[Notification] Could not find Discord User ${task.discordId}`);
        }
    } catch (error) {
        console.error(`[Notification] Failed to send DM to ${task.discordId}:`, error.message);
    }
    
    isProcessingQueue = false;
}, 500); // 500ms safe interval

/**
 * Pushes a Direct Message into the secure Discord Throttle Queue.
 * @param {string} discordId - The user's Discord ID.
 * @param {string} message - The message content.
 */
async function sendNotification(discordId, message) {
    messageQueue.push({ discordId, message });
}

module.exports = { sendNotification };