/***********************************************************************************************************************************************************************
 * 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 StickyBannerSetting = require('../../models/notifications/sticky_banner_setting.mdl');
const mdl_Assets = require('../../models/assets/assets.mdl');
const mediaToken = require('../../services/mediaToken.service');
const R = require('../../utils/response.util');
const { notInFutureOrExpired } = require('../../utils/notificationVisibility.util');

const STICKY_LIMIT = 3;
const IMAGE_INCLUDE = {
    model:     mdl_Assets,
    as:        'image',
    attributes: ["asset_id", "display_name", "file_url", "thumbnail_url", "storage_provider", "storage_key", "file_type", "mime_type"],
    required:  false,
};

// Mirrors controllers/admin/advertisements.controller.js's attachImageStreamToken.
async function attachImageStreamToken(image, req) {
    if (!image || image.storage_provider !== 's3' || !mediaToken.SUPPORTED_TYPES.includes(image.file_type)) {
        return image;
    }
    const ip = mediaToken.resolveIp(req);
    const { token } = await mediaToken.issueForAsset(image, req.user?.user_id, ip);
    image.stream_token = token;
    image.file_url = null;
    image.thumbnail_url = null;
    delete image.storage_key;
    return image;
}

// One shared banner image for the whole rotating sticky bar (see
// controllers/admin/notificationBroadcasts.controller.js's
// getStickyBannerSetting/updateStickyBannerSetting) — not per-announcement.
async function resolveSharedBannerImage(req) {
    const setting = await StickyBannerSetting.findOne({ where: { id: 1 }, include: [IMAGE_INCLUDE] });
    if (!setting?.image) return null;
    const image = setting.toJSON().image;
    await attachImageStreamToken(image, req);
    return image;
}

// ─── 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, ...notInFutureOrExpired() },
        });

        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, ...notInFutureOrExpired() } });
        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 [notifications, bannerImage] = await Promise.all([
            AdminNotification.findAll({
                where: {
                    seen: false,
                    show_in_sticky: true,
                    type: 'announcement',
                    ...notInFutureOrExpired(),
                },
                order: [['createdAt', 'DESC']],
                limit: STICKY_LIMIT,
            }),
            resolveSharedBannerImage(req),
        ]);

        return R.success(res, 'Sticky announcements fetched.', { announcements: notifications, bannerImage });
    } 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 };