const crypto = require("crypto");
const db = require("../models");
const { Op } = require("sequelize");

exports.createNotification = async (req, res, next) => {
  const { notificationHeadline, notificationDescription, notificationType, userIds = [] } = req.body;
  if (!notificationHeadline || !["USER", "ANNOUNCEMENT"].includes(notificationType)) return res.status(400).json({ success: false, error: { code: "VALIDATION_ERROR", message: "Valid headline and notificationType are required" } });
  if (notificationType === "USER" && (!Array.isArray(userIds) || !userIds.length)) return res.status(400).json({ success: false, error: { code: "VALIDATION_ERROR", message: "USER notifications require userIds" } });
  const transaction = await db.sequelize.transaction();
  try {
    const notification = await db.notification.create({ notification_id: `notif_${crypto.randomUUID()}`, notificationHeadline, notificationDescription, notificationType, dateCreated: new Date() }, { transaction });
    const uniqueUsers = [...new Set(userIds)];
    if (uniqueUsers.length) await db.userNotification.bulkCreate(uniqueUsers.map((user_id) => ({ user_id, notification_id: notification.notification_id })), { transaction, ignoreDuplicates: true });
    await transaction.commit(); return res.status(201).json({ success: true, data: { notification, assignedUsers: uniqueUsers.length } });
  } catch (error) { await transaction.rollback(); return next(error); }
};
exports.getAnnouncements = async (_req, res, next) => { try { return res.json({ success: true, data: await db.notification.findAll({ where: { notificationType: "ANNOUNCEMENT", isActive: true }, order: [["createdAt", "DESC"]] }) }); } catch (e) { return next(e); } };
exports.getMyNotifications = async (req, res, next) => { try { const rows = await db.userNotification.findAll({ where: { user_id: req.user.id }, include: [{ model: db.notification, as: "notification", where: { isActive: true } }], order: [["createdAt", "DESC"]] }); return res.json({ success: true, data: rows }); } catch (e) { return next(e); } };
exports.markAsRead = async (req, res, next) => { try { const [count] = await db.userNotification.update({ isRead: true }, { where: { user_id: req.user.id, notification_id: req.params.notificationId } }); if (!count) return res.status(404).json({ success: false, error: { code: "NOT_FOUND", message: "Notification not found" } }); return res.json({ success: true }); } catch (e) { return next(e); } };
exports.markAllAsRead = async (req, res, next) => { try { const [count] = await db.userNotification.update({ isRead: true }, { where: { user_id: req.user.id, isRead: false } }); return res.json({ success: true, data: { updated: count } }); } catch (e) { return next(e); } };