<?php

namespace App\Services\Softphone;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Modules\Platform\User\Entities\User;

/**
 * Establishes and terminates the Softphone session in the user's browser.
 */
class SoftphoneSessionManager
{
    /**
     * Session key marking a Softphone integration session.
     */
    public const MARKER = 'softphone_integration';

    /**
     * Logs the user in and marks the session as an integration session.
     */
    public function establish(Request $request, User $user): void
    {
        // The request is authenticated by the API (JWT) guard, but the iframe
        // reads the normal web session, so log in on that guard explicitly.
        Auth::guard('web')->login($user);

        $request->session()->put(self::MARKER, true);

        // Prevent session fixation.
        $request->session()->regenerate();
    }

    /**
     * Removes the user's live integration sessions only (not the normal
     * dashboard session).
     *
     * @return int number of sessions terminated
     */
    public function terminateForUser(int $userId): int
    {
        $ids = [];

        DB::table('sessions')
            ->where('user_id', $userId)
            ->select('id', 'payload')
            ->orderBy('id')
            ->each(function ($session) use (&$ids) {
                if ($this->payloadIsIntegrationSession($session->payload)) {
                    $ids[] = $session->id;
                }
            });

        if (empty($ids)) {
            return 0;
        }

        return DB::table('sessions')->whereIn('id', $ids)->delete();
    }

    /**
     * Checks the stored session payload for the integration marker.
     */
    public function payloadIsIntegrationSession(?string $payload): bool
    {
        if (empty($payload)) {
            return false;
        }

        $decoded = @unserialize(@base64_decode($payload, true), ['allowed_classes' => false]);

        if (!is_array($decoded)) {
            $json = json_decode((string) $payload, true);
            $decoded = is_array($json) ? $json : null;
        }

        return is_array($decoded) && !empty($decoded[self::MARKER]);
    }
}