<?php

declare(strict_types=1);

namespace Tests\Security\AuthenticationTests;

use Tests\Security\SecurityTestCase;
use App\Framework\Http\HttpRequest;
use App\Framework\Http\Method;

/**
 * Session Security tests
 *
 * Tests session hijacking, session fixation, and session timeout mechanisms
 */
final readonly class SessionSecurityTest extends SecurityTestCase
{
    /**
     * Test session hijacking prevention
     */
    public function testPreventsSessionHijacking(): void
    {
        // Simulate session creation
        session_start();
        $originalSessionId = session_id();
        $_SESSION['user_id'] = 123;
        $_SESSION['ip_address'] = '192.168.1.100';
        $_SESSION['user_agent'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)';

        // Simulate hijack attempt from different IP
        $hijackAttempt = $this->detectSessionHijack(
            sessionIp: '192.168.1.100',
            requestIp: '203.0.113.42',  // Different IP
            sessionUserAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)',
            requestUserAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)'
        );

        if (!$hijackAttempt) {
            throw new \RuntimeException('Session hijacking from different IP not detected');
        }

        echo "✅ Session hijacking from different IP detected\n";

        // Simulate hijack attempt from different User-Agent
        $hijackAttempt = $this->detectSessionHijack(
            sessionIp: '192.168.1.100',
            requestIp: '192.168.1.100',
            sessionUserAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)',
            requestUserAgent: 'curl/7.68.0'  // Different User-Agent
        );

        if (!$hijackAttempt) {
            throw new \RuntimeException('Session hijacking from different User-Agent not detected');
        }

        echo "✅ Session hijacking from different User-Agent detected\n";
    }

    /**
     * Test session fixation prevention
     */
    public function testPreventsSessionFixation(): void
    {
        // Attacker provides session ID
        session_id('attacker_controlled_session_id');
        session_start();

        $oldSessionId = session_id();

        // User logs in - session should be regenerated
        $this->regenerateSessionOnLogin();

        $newSessionId = session_id();

        if ($oldSessionId === $newSessionId) {
            throw new \RuntimeException('Session ID not regenerated after login - vulnerable to session fixation');
        }

        echo "✅ Session ID regenerated after login (fixation prevention)\n";
    }

    /**
     * Test session timeout
     */
    public function testEnforcesSessionTimeout(): void
    {
        session_start();
        $_SESSION['last_activity'] = time() - 3600; // 1 hour ago

        $isExpired = $this->checkSessionTimeout(
            lastActivity: $_SESSION['last_activity'],
            timeoutSeconds: 1800 // 30 minute timeout
        );

        if (!$isExpired) {
            throw new \RuntimeException('Expired session not detected');
        }

        echo "✅ Session timeout enforced (30 minute inactivity)\n";
    }

    /**
     * Test session data integrity
     */
    public function testValidatesSessionDataIntegrity(): void
    {
        session_start();
        $_SESSION['user_id'] = 123;
        $_SESSION['role'] = 'user';

        // Simulate tampering
        $_SESSION['role'] = 'admin'; // Privilege escalation attempt

        $isTampered = $this->detectSessionTampering(
            originalData: ['user_id' => 123, 'role' => 'user'],
            currentData: ['user_id' => 123, 'role' => 'admin']
        );

        if (!$isTampered) {
            throw new \RuntimeException('Session tampering not detected');
        }

        echo "✅ Session data tampering detected\n";
    }

    /**
     * Test session cookie security attributes
     */
    public function testSessionCookieSecurityAttributes(): void
    {
        $cookieParams = session_get_cookie_params();

        $issues = [];

        // Check HttpOnly flag
        if (!$cookieParams['httponly']) {
            $issues[] = 'HttpOnly flag not set (vulnerable to XSS)';
        }

        // Check Secure flag
        if (!$cookieParams['secure']) {
            $issues[] = 'Secure flag not set (session can be transmitted over HTTP)';
        }

        // Check SameSite attribute
        if (empty($cookieParams['samesite']) || !in_array($cookieParams['samesite'], ['Strict', 'Lax'])) {
            $issues[] = 'SameSite attribute not properly set (vulnerable to CSRF)';
        }

        if (!empty($issues)) {
            throw new \RuntimeException(
                "Session cookie security issues:\n" . implode("\n", $issues)
            );
        }

        echo "✅ Session cookie has proper security attributes (HttpOnly, Secure, SameSite)\n";
    }

    /**
     * Test concurrent session limit
     */
    public function testEnforcesConcurrentSessionLimit(): void
    {
        $userId = 123;
        $maxSessions = 3;

        // Simulate active sessions
        $activeSessions = [
            'session1' => ['created' => time() - 100],
            'session2' => ['created' => time() - 200],
            'session3' => ['created' => time() - 300],
        ];

        // Try to create 4th session
        $canCreateSession = $this->checkConcurrentSessionLimit(
            userId: $userId,
            activeSessions: $activeSessions,
            maxSessions: $maxSessions
        );

        if ($canCreateSession) {
            throw new \RuntimeException('Concurrent session limit not enforced');
        }

        echo "✅ Concurrent session limit enforced (max {$maxSessions} sessions)\n";
    }

    /**
     * Test session destruction on logout
     */
    public function testProperSessionDestruction(): void
    {
        session_start();
        $_SESSION['user_id'] = 123;
        $_SESSION['authenticated'] = true;

        // Logout
        $this->destroySession();

        if (isset($_SESSION['user_id']) || isset($_SESSION['authenticated'])) {
            throw new \RuntimeException('Session data not properly destroyed on logout');
        }

        if (session_status() === PHP_SESSION_ACTIVE) {
            throw new \RuntimeException('Session still active after logout');
        }

        echo "✅ Session properly destroyed on logout\n";
    }

    /**
     * Run all session security tests
     */
    public function runAllTests(): array
    {
        $results = [];

        try {
            $this->testPreventsSessionHijacking();
            $results['session_hijacking'] = 'PASS';
        } catch (\Exception $e) {
            $results['session_hijacking'] = 'FAIL: ' . $e->getMessage();
        }

        try {
            $this->testPreventsSessionFixation();
            $results['session_fixation'] = 'PASS';
        } catch (\Exception $e) {
            $results['session_fixation'] = 'FAIL: ' . $e->getMessage();
        }

        try {
            $this->testEnforcesSessionTimeout();
            $results['session_timeout'] = 'PASS';
        } catch (\Exception $e) {
            $results['session_timeout'] = 'FAIL: ' . $e->getMessage();
        }

        try {
            $this->testValidatesSessionDataIntegrity();
            $results['data_integrity'] = 'PASS';
        } catch (\Exception $e) {
            $results['data_integrity'] = 'FAIL: ' . $e->getMessage();
        }

        try {
            $this->testSessionCookieSecurityAttributes();
            $results['cookie_security'] = 'PASS';
        } catch (\Exception $e) {
            $results['cookie_security'] = 'FAIL: ' . $e->getMessage();
        }

        try {
            $this->testEnforcesConcurrentSessionLimit();
            $results['concurrent_sessions'] = 'PASS';
        } catch (\Exception $e) {
            $results['concurrent_sessions'] = 'FAIL: ' . $e->getMessage();
        }

        try {
            $this->testProperSessionDestruction();
            $results['session_destruction'] = 'PASS';
        } catch (\Exception $e) {
            $results['session_destruction'] = 'FAIL: ' . $e->getMessage();
        }

        return $results;
    }

    private function detectSessionHijack(
        string $sessionIp,
        string $requestIp,
        string $sessionUserAgent,
        string $requestUserAgent
    ): bool {
        // IP mismatch detection
        if ($sessionIp !== $requestIp) {
            return true;
        }

        // User-Agent mismatch detection
        if ($sessionUserAgent !== $requestUserAgent) {
            return true;
        }

        return false;
    }

    private function regenerateSessionOnLogin(): void
    {
        session_regenerate_id(true);
    }

    private function checkSessionTimeout(int $lastActivity, int $timeoutSeconds): bool
    {
        $inactiveTime = time() - $lastActivity;
        return $inactiveTime > $timeoutSeconds;
    }

    private function detectSessionTampering(array $originalData, array $currentData): bool
    {
        // Simplified tampering detection
        foreach ($originalData as $key => $value) {
            if (!isset($currentData[$key]) || $currentData[$key] !== $value) {
                return true;
            }
        }

        return false;
    }

    private function checkConcurrentSessionLimit(
        int $userId,
        array $activeSessions,
        int $maxSessions
    ): bool {
        return count($activeSessions) < $maxSessions;
    }

    private function destroySession(): void
    {
        $_SESSION = [];
        session_destroy();
    }
}
