<?php

namespace App\Helpers;

class SessionHelper
{
    private static $sessionFile;

    private static function getSessionFile()
    {
        if (self::$sessionFile === null) {
            $storageDir = __DIR__ . "/../../storage";
            if (!file_exists($storageDir)) {
                mkdir($storageDir, 0777, true);
            }
            self::$sessionFile = $storageDir . "/telegram_sessions.json";
        }
        return self::$sessionFile;
    }

    /**
     * Load all sessions
     */
    public static function loadSessions()
    {
        $file = self::getSessionFile();
        
        if (!file_exists($file)) {
            file_put_contents($file, json_encode(["sessions" => []], JSON_PRETTY_PRINT));
        }

        $json = json_decode(file_get_contents($file), true);
        return $json["sessions"] ?? [];
    }

    /**
     * Save all sessions
     */
    public static function saveSessions($sessions)
    {
        $file = self::getSessionFile();
        file_put_contents($file, json_encode(["sessions" => $sessions], JSON_PRETTY_PRINT));
    }

    /**
     * Get session for a chat ID
     */
    public static function getSession($chatId)
    {
        $sessions = self::loadSessions();
        return $sessions[$chatId] ?? null;
    }

    /**
     * Set session for a chat ID
     */
    public static function setSession($chatId, $value)
    {
        $sessions = self::loadSessions();
        $sessions[$chatId] = $value;
        self::saveSessions($sessions);
    }

    /**
     * Clear session for a chat ID
     */
    public static function clearSession($chatId)
    {
        $sessions = self::loadSessions();
        unset($sessions[$chatId]);
        self::saveSessions($sessions);
    }
}