import { logger } from '../logger';
import { Queue } from 'bullmq';
import Redis from 'ioredis';

const connection = process.env.REDIS_URL
    ? new Redis(process.env.REDIS_URL, { maxRetriesPerRequest: null })
    : new Redis({
        host: process.env.REDIS_HOST || 'localhost',
        port: parseInt(process.env.REDIS_PORT || '6379'),
        username: process.env.REDIS_USERNAME || 'default',
        password: process.env.REDIS_PASSWORD || undefined,
        tls: process.env.REDIS_TLS === 'true' ? {} : undefined,
        maxRetriesPerRequest: null
    });

connection.on('error', (err) => logger.error({ err }, '[REDIS] Queue connection error:'));

export const whatsappQueue = new Queue('whatsapp-queue', { connection });
export const notificationQueue = new Queue('notification-queue', { connection });

/** Gracefully close all queues and the underlying connection */
export async function closeQueues() {
    logger.info('[QUEUE] Closing all queues...');
    await whatsappQueue.close();
    await notificationQueue.close();
    await connection.quit();
}

/** Schedule an email notification */
export async function scheduleEmail(payload: { 
    to: string, 
    subject: string, 
    templateId?: number, 
    params?: Record<string, any>,
    htmlContent?: string 
}) {
    await notificationQueue.add('send-email', payload, {
        attempts: 3,
        backoff: { type: 'exponential', delay: 1000 }
    });
}

// ─── Time-Travel Context (Redis overlay for historical lesson replay) ────────
export const redis = connection; // Shared connection for time-travel ops

const TT_TTL = 1800; // 30 minutes
const ttKey = (userId: string) => `time_travel:${userId}`;

export async function setTimeTravelContext(userId: string, replayDay: number): Promise<void> {
    await connection.set(ttKey(userId), String(replayDay), 'EX', TT_TTL);
    logger.info(`[TIME-TRAVEL] 🕰️ SET User ${userId} → Day ${replayDay} (TTL: ${TT_TTL}s)`);
}

export async function getTimeTravelContext(userId: string): Promise<number | null> {
    const val = await connection.get(ttKey(userId));
    if (!val) return null;
    const day = parseFloat(val);
    return isNaN(day) ? null : day;
}

export async function clearTimeTravelContext(userId: string): Promise<void> {
    const n = await connection.del(ttKey(userId));
    if (n > 0) logger.info(`[TIME-TRAVEL] 🗑️ CLEARED User ${userId}`);
}

export async function scheduleMessage(userId: string, text: string, delayMs: number = 0, organizationId?: string) {
    if (process.env.DISABLE_WHATSAPP_SEND === 'true') {
        logger.warn(`[QUEUE] DISABLE_WHATSAPP_SEND is true. Skipping 'send-message' for user ${userId}`);
        return;
    }
    await whatsappQueue.add('send-message', { userId, text, organizationId }, { delay: delayMs });
}

export async function scheduleTrackDay(userId: string, trackId: string, dayNumber: number, delayMs: number = 0, organizationId?: string) {
    if (process.env.DISABLE_WHATSAPP_SEND === 'true') {
        logger.warn(`[QUEUE] DISABLE_WHATSAPP_SEND is true. Skipping 'send-content' for user ${userId}`);
        return;
    }
    await whatsappQueue.add('send-content', { userId, trackId, dayNumber, organizationId }, { delay: delayMs });
}

export async function enrollUser(userId: string, trackId: string, organizationId?: string) {
    if (process.env.DISABLE_WHATSAPP_SEND === 'true') {
        logger.warn(`[QUEUE] DISABLE_WHATSAPP_SEND is true. Skipping 'enroll-user' for user ${userId}`);
        return;
    }
    await whatsappQueue.add('enroll-user', { userId, trackId, organizationId });
}

/** Send a WhatsApp interactive BUTTON message (max 3 buttons). */
export async function scheduleInteractiveButtons(
    userId: string,
    bodyText: string,
    buttons: Array<{ id: string; title: string }>,
    organizationId?: string
) {
    if (process.env.DISABLE_WHATSAPP_SEND === 'true') {
        logger.warn(`[QUEUE] DISABLE_WHATSAPP_SEND is true. Skipping 'send-interactive-buttons' for user ${userId}`);
        return;
    }
    await whatsappQueue.add('send-interactive-buttons', { userId, bodyText, buttons, organizationId });
}

/** Send a WhatsApp interactive LIST message (up to 10 rows, grouped in sections). */
export async function scheduleInteractiveList(
    userId: string,
    headerText: string,
    bodyText: string,
    buttonLabel: string,
    sections: Array<{ title: string; rows: Array<{ id: string; title: string; description?: string }> }>,
    organizationId?: string
) {
    if (process.env.DISABLE_WHATSAPP_SEND === 'true') {
        logger.warn(`[QUEUE] DISABLE_WHATSAPP_SEND is true. Skipping 'send-interactive-list' for user ${userId}`);
        return;
    }
    await whatsappQueue.add('send-interactive-list', { userId, headerText, bodyText, buttonLabel, sections, organizationId });
}

/** 🚨 ASYNC HANDOVER: Send inbound message for background processing in the worker. */
export async function scheduleInboundMessage(payload: { phone: string, text: string, audioUrl?: string, imageUrl?: string, messageId?: string, organizationId?: string }) {
    await whatsappQueue.add('handle-inbound', payload, {
        attempts: 3,
        backoff: { type: 'exponential', delay: 1000 },
        removeOnComplete: true,
        removeOnFail: false
    });
}

/** 📢 BROADCAST: Enqueue a mass message task. */
export async function scheduleBroadcast(payload: { organizationId: string, listId: string, message: string }) {
    await whatsappQueue.add('send-broadcast', payload, {
        attempts: 1, // We handle retry logic within the loop if needed, but the whole job shouldn't necessarily retry
        removeOnComplete: true
    });
}

/** 🚀 CAMPAIGN: Enqueue a mass campaign task for all contacts or a specific list. */
export async function scheduleCampaign(payload: { 
    organizationId: string, 
    messageContent: string, 
    listId?: string,
    templateName?: string,
    templateLanguage?: string
}) {
    await whatsappQueue.add('process-campaign', payload, {
        attempts: 1,
        removeOnComplete: true
    });
}