/***********************************************************************************************************************************************************************
 * File Name    : notification.controller.js
 * Type         : Controller (Admin)
 * Description  : Admin notification management.
 *                GET  /admin/notifications        — paginated list, newest first
 *                GET  /admin/notifications/unseen — unseen count only
 *                GET  /admin/notifications/sticky — current sticky announcement, if any
 *                PATCH /admin/notifications/:id/seen — mark one as seen
 *                PATCH /admin/notifications/seen-all  — mark all as seen
 *
 * Author: Kenneth Obsequio (@lash0000)
 * Date Created: Jun. 19, 2026
 ***********************************************************************************************************************************************************************/
const AdminNotification = require('../../models/notifications/admin_notification.mdl');
const R = require('../../utils/response.util');

// ─── GET /admin/notifications ─────────────────────────────────────────────────
async function list(req, res) {
    try {
        const page  = Math.max(1, parseInt(req.query.page)  || 1);
        const limit = Math.min(50, parseInt(req.query.limit) || 20);
        const offset = (page - 1) * limit;

        const { count, rows } = await AdminNotification.findAndCountAll({
            order: [['createdAt', 'DESC']],
            limit,
            offset,
            where: { show_in_notifications: true },
        });

        return R.success(res, 'Notifications fetched.', {
            notifications: rows,
            pagination: { page, limit, total: count, pages: Math.ceil(count / limit) },
        });
    } catch (err) {
        console.error('[NOTIFICATION] list error:', err);
        return R.error(res, 'Failed to fetch notifications.');
    }
}

// ─── GET /admin/notifications/unseen ─────────────────────────────────────────
async function unseenCount(req, res) {
    try {
        const count = await AdminNotification.count({ where: { seen: false, show_in_notifications: true } });
        return R.success(res, 'Unseen count fetched.', { count });
    } catch (err) {
        console.error('[NOTIFICATION] unseenCount error:', err);
        return R.error(res, 'Failed to fetch unseen count.');
    }
}

// ─── GET /admin/notifications/sticky ──────────────────────────────────────────
// Not user-scoped, same as list()/unseenCount() above — one shared sticky
// banner for every admin. Whoever dismisses it first dismisses it for all.
async function stickyAnnouncement(req, res) {
    try {
        const notification = await AdminNotification.findOne({
            where: {
                seen: false,
                show_in_sticky: true,
                type: 'announcement',
            },
            order: [['createdAt', 'DESC']],
        });

        return R.success(res, 'Sticky announcement fetched.', { announcement: notification });
    } catch (err) {
        console.error('[NOTIFICATION] stickyAnnouncement error:', err);
        return R.error(res, 'Failed to fetch sticky announcement.');
    }
}

// ─── PATCH /admin/notifications/:id/seen ─────────────────────────────────────
async function markSeen(req, res) {
    try {
        const notification = await AdminNotification.findByPk(req.params.id);
        if (!notification) return R.error(res, 'Notification not found.', 404);

        await notification.update({ seen: true, seen_at: new Date() });
        return R.success(res, 'Notification marked as seen.', notification);
    } catch (err) {
        console.error('[NOTIFICATION] markSeen error:', err);
        return R.error(res, 'Failed to mark notification as seen.');
    }
}

// ─── PATCH /admin/notifications/seen-all ─────────────────────────────────────
async function markAllSeen(req, res) {
    try {
        const now = new Date();
        const [count] = await AdminNotification.update(
            { seen: true, seen_at: now },
            { where: { seen: false } }
        );
        return R.success(res, `${count} notification(s) marked as seen.`, { count });
    } catch (err) {
        console.error('[NOTIFICATION] markAllSeen error:', err);
        return R.error(res, 'Failed to mark all notifications as seen.');
    }
}

module.exports = { list, unseenCount, stickyAnnouncement, markSeen, markAllSeen };