<?php

namespace App\Http\Controllers\Api;

use App\Config\SessionTimeout;
use Illuminate\Http\JsonResponse;
use Symfony\Component\HttpFoundation\Response;

class SessionTimeoutController extends BaseApiController
{
    public function getTimeoutConfig(): JsonResponse
    {
        return response()->json([
            'success' => true,
            'timeout' => SessionTimeout::TIMEOUT_DURATION,
            'warning_time' => SessionTimeout::WARNING_THRESHOLD,
            'check_interval' => SessionTimeout::CHECK_INTERVAL,
            'logout_url' => url('/api/v1/auth/logout'),
            'keep_alive_url' => url('/api/v1/session/pingActivity'),
            'check_url' => url('/api/v1/session/checkTimeout'),
        ]);
    }

    public function checkTimeout(): JsonResponse
    {
        $session = session();

        // Verify session exists and has last_activity
        if (!$session->has('last_activity')) {
            return $this->expireSession();
        }

        $lastActivity = $session->get('last_activity');
        $elapsed = time() - $lastActivity;

        if ($elapsed > SessionTimeout::TIMEOUT_DURATION) {
            return $this->expireSession();
        } elseif ($elapsed > SessionTimeout::WARNING_THRESHOLD) {
            return response()->json([
                'status' => 'warning',
                'time_remaining' => SessionTimeout::TIMEOUT_DURATION - $elapsed,
            ]);
        }

        return response()->json([
            'status' => 'active',
            'time_remaining' => SessionTimeout::TIMEOUT_DURATION - $elapsed,
        ]);
    }

    public function pingActivity(): JsonResponse
    {
        $session = session();

        // Only update if session is still valid
        if (!$session->has('last_activity') ||
            (time() - $session->get('last_activity') > SessionTimeout::TIMEOUT_DURATION)) {
            return $this->expireSession();
        }

        $session->put('last_activity', time());
        return response()->json([
            'status' => 'active',
            'time_remaining' => SessionTimeout::TIMEOUT_DURATION,
        ]);
    }

    private function expireSession(): JsonResponse
    {
        $this->destroySession();
        return response()->json([
            'status'   => 'expired',
            'redirect' => url('/login'),
            'message'  => 'Your session has expired due to inactivity.',
        ], Response::HTTP_UNAUTHORIZED);
    }

    private function destroySession(): void
    {
        $session = session();
        $session->flash('error', 'Your session has expired due to inactivity.');

        // Clear session data
        $session->forget('last_activity');
        $session->invalidate();

        // Regenerate session ID for security
        $session->regenerate(true);
    }
}