const nocodbService = require('./nocodb');
const logger = require('../utils/logger');
const config = require('../config');

class AccountExpirationService {
    constructor() {
        this.checkInterval = null;
    }

    // Start the expiration check service
    start() {
        // Run check every hour
        this.checkInterval = setInterval(() => {
            this.checkExpiredAccounts();
        }, 60 * 60 * 1000); // 1 hour

        // Also run immediately on start
        this.checkExpiredAccounts();
        
        logger.info('Account expiration service started');
    }

    // Stop the service
    stop() {
        if (this.checkInterval) {
            clearInterval(this.checkInterval);
            this.checkInterval = null;
        }
    }

    // Check and handle expired accounts
    async checkExpiredAccounts() {
        try {
            // Get all users
            const users = await nocodbService.getLoginRecords();
            
            const now = new Date();
            const expiredUsers = [];

            for (const user of users) {
                if (user.ExpiresAt && new Date(user.ExpiresAt) < now) {
                    expiredUsers.push(user);
                }
            }

            // Delete expired accounts
            for (const user of expiredUsers) {
                await this.deleteExpiredAccount(user);
            }

            if (expiredUsers.length > 0) {
                logger.info(`Deleted ${expiredUsers.length} expired temp accounts`);
            }

        } catch (error) {
            logger.error('Error checking expired accounts:', error);
        }
    }

    // Delete a single expired account
    async deleteExpiredAccount(user) {
        try {
            await nocodbService.deleteRecord(
                config.nocodb.loginSheetId,
                user.Id
            );

            logger.info(`Deleted expired temp account: ${user.Email}`);
            
            // Optional: Send notification email before deletion
            // await emailService.sendAccountExpirationNotice(user.Email);

        } catch (error) {
            logger.error(`Failed to delete expired account ${user.Email}:`, error);
        }
    }

    // Calculate expiration date based on admin settings
    static calculateExpirationDate(expireDays) {
        if (!expireDays || expireDays <= 0) return null;
        
        const expirationDate = new Date();
        expirationDate.setDate(expirationDate.getDate() + expireDays);
        return expirationDate;
    }
}

module.exports = new AccountExpirationService();