/***********************************************************************************************************************************************************************
 * File Name    : lift_expired_bans.cron.js
 * Type         : Cron Job
 * Description  : Automatically lifts temporary bans whose expires_at has passed.
 *                Clears is_banned + ban_expires_at on the user record and marks
 *                the ban row as lifted with a system lift_reason.
 *
 *                Note: The auth middleware also auto-lifts expired bans inline on
 *                the next login attempt, so this cron is a safety net — it keeps
 *                the DB state clean even if a user never logs in again.
 *
 * Schedule     : Every hour, on the hour ("0 * * * *"). Registered by
 *                cron/admin.cron.js.
 *
 * Author: Kenneth Obsequio
 * Date Created: Jun. 27, 2026
 ***********************************************************************************************************************************************************************/
const { Op } = require('sequelize');
const sequelize    = require('../../config/db.config');
const mdl_Users    = require('../../models/users/users.mdl');
const mdl_UserBans = require('../../models/users/user_bans.mdl');
const { sendEmail } = require('../../services/email.service');
const { fmtDate }   = require('../../utils/datetime.util');

async function run() {
    try {
        const expiredBans = await mdl_UserBans.findAll({
            where: {
                ban_type:  'temporary',
                is_lifted: false,
                expires_at: { [Op.lte]: new Date() },
            },
        });

        if (!expiredBans.length) return;

        const banIds  = expiredBans.map((b) => b.ban_id);
        const userIds = [...new Set(expiredBans.map((b) => Number(b.user_id)))];
        const usersMap = await mdl_Users.findAll({
            where: { user_id: userIds },
            attributes: ['user_id', 'email', 'personal_info'],
        }).then((rows) => Object.fromEntries(rows.map((u) => [u.user_id, u])));

        await sequelize.transaction(async (t) => {
            await mdl_UserBans.update(
                {
                    is_lifted:   true,
                    lifted_at:   new Date(),
                    lift_reason: 'Automatically lifted — ban period expired.',
                },
                { where: { ban_id: banIds }, transaction: t }
            );

            await mdl_Users.update(
                { is_banned: false, ban_expires_at: null },
                { where: { user_id: userIds }, transaction: t }
            );
        });

        const dateStr = fmtDate(new Date());
        userIds.forEach((uid) => {
            const u = usersMap[uid];
            if (!u) return;
            sendEmail({
                to:   u.email,
                type: 'BAN_LIFTED',
                data: {
                    name:  u.personal_info?.name?.full_name ?? 'User',
                    email: u.email,
                    date:  dateStr,
                },
            }).catch((err) => console.error('[CRON][LIFT EXPIRED BANS] Email failed:', u.email, err));
        });

        console.log(`[CRON][LIFT EXPIRED BANS] Lifted ${expiredBans.length} ban(s) for ${userIds.length} user(s).`);
    } catch (err) {
        console.error('[CRON][LIFT EXPIRED BANS] Failed:', err);
    }
}

module.exports = {
    name:     'liftExpiredBans',
    schedule: '0 * * * *',
    run,
};