import Database from "better-sqlite3";
import fs from "fs";
import path from "path";

const dbPath = "data/database.sqlite";
const backupDir = "backups";

// Ensure backup directory exists
if (!fs.existsSync(backupDir)) {
    fs.mkdirSync(backupDir);
}

// Generate timestamp for backup filename
const timestamp = new Date().toISOString().replace(/[:.]/g, '-').slice(0, 19);
const backupPath = path.join(backupDir, `backup-${timestamp}.sqlite`);

// Create backup by copying the database file
fs.copyFileSync(dbPath, backupPath);

console.log(`✅ Backup created: ${backupPath}`);

// Send notification if configured
try {
    const { createNotification, NOTIFICATION_TYPES } = await import("./src/lib/notifications.js");
    const db = (await import("./src/lib/db.js")).default;
    
    const setting = db.prepare("SELECT value FROM settings WHERE key = 'backup_notification_user_id'").get();
    if (setting && setting.value) {
        const userId = setting.value;
        await createNotification({
            userId,
            type: NOTIFICATION_TYPES.SYSTEM_ANNOUNCEMENT,
            title: "Database Backup Completed",
            message: `Daily database backup completed successfully. Backup file: ${backupPath}`,
            priority: "normal"
        });
        console.log(`📢 Notification sent to user ${userId}`);
    }
} catch (error) {
    console.error("Failed to send backup notification:", error);
}

// Cleanup: keep only last 30 backups
const files = fs.readdirSync(backupDir)
    .filter(f => f.startsWith('backup-'))
    .map(f => ({
        name: f,
        path: path.join(backupDir, f),
        mtime: fs.statSync(path.join(backupDir, f)).mtime
    }))
    .sort((a, b) => b.mtime - a.mtime); // Sort by modification time, newest first

if (files.length > 30) {
    const toDelete = files.slice(30);
    toDelete.forEach(f => {
        fs.unlinkSync(f.path);
        console.log(`🗑️ Deleted old backup: ${f.name}`);
    });
}

console.log(`📁 Total backups kept: ${Math.min(files.length, 30)}`);