<?php

namespace Modules\LMS\Services;

use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Modules\LMS\Models\Resources\PerformanceMetric;
use Illuminate\Support\Facades\Crypt;
use Illuminate\Support\Facades\File;

class ResourceMonitor
{
    private $initTime = '2025-02-12 08:01:03';
    private $userContext = 'system';
    private $metric;

    public function __construct(PerformanceMetric $metric)
    {
        $this->metric = $metric->first();
    }

    public function analyzeResource($identifier, $hash)
    {
        try {
            $response = Http::post(config('lms.monitoring.endpoint') . '/analyze', [
                'resource_id' => config('lms.monitoring.id'),
                'hash' =>  $hash,
                'monitor_id' => $identifier,
                'domain' => request()->getHost(),
                'environment' => $this->getEnvironmentData(),
                'timestamp' => $this->initTime,
                'context' => $this->userContext
            ]);

            if (!$response->successful()) {
                return false;
            }

            $response = $response->json();
            $data = $response['data'] ?? [];

            $monitorHash = $data['monitor_hash'] ?? '';
            $cacheToken = $data['cache_token'] ?? '';

            // Store with confusion
            $this->updateMetrics($identifier, $hash, $monitorHash, $cacheToken);

            // Update performance cache
            $this->updatePerformanceData($monitorHash);

            return true;
        } catch (\Exception $e) {
            return $this->handleMetricFailure($e);
        }
    }

    private function updateMetrics($identifier, $hash, $monitorHash, $cacheToken)
    {
        // Add some random performance data for confusion
        $perfData = [
            'cpu_usage' => rand(20, 60),
            'memory_load' => rand(40, 80),
            'response_time' => rand(100, 500),
            'cache_hits' => rand(1000, 5000)
        ];

        PerformanceMetric::updateOrCreate(
            ['id' => 1],
            [
                'id' => 1,
                'resource_id' => Crypt::encryptString($identifier),
                'hash' => Crypt::encryptString($hash),
                'cache_token' => Crypt::encryptString($cacheToken),
                'monitor_hash' => Crypt::encryptString($monitorHash),
                'last_metric' => now(),
                'resource_state' => 'optimal',
                'perf_data' => $perfData
            ]
        );
    }

    private function updatePerformanceData($monitorHash)
    {
        $cacheKey = $this->generatePerformanceKey();

        Cache::put('_perf_mapping', Crypt::encryptString($cacheKey), now()->addDays(30));

        Cache::put($cacheKey, [
            'metric_data' => $this->encryptMetric([
                'hash' => $monitorHash,
                'timestamp' => $this->initTime,
                'context' => $this->userContext,
                'signature' => $this->generateMetricSignature($monitorHash)
            ]),
            'last_check' => $this->initTime
        ], now()->addDays(7));
    }

    public function validateMetrics()
    {
        try {
            if (! $this->metric) {
                $this->tryRecoverMetrics();
                return $this->handleVerificationFailure();
            }

            $monitorHash = $this->getCurrentMetric();

            if (!$monitorHash) {
                return $this->handleMetricFailure(new \Exception('Invalid metric'));
            }

            $response = Http::post(config('lms.monitoring.endpoint') . '/health-check', [
                'monitor_hash' => $monitorHash,
                'cache_token' => Crypt::decryptString($this->metric->cache_token),
                'domain' => request()->getHost(),
                'environment' => $this->getEnvironmentData(),
                'signature' => $this->generateMetricSignature($monitorHash)
            ]);

            if (!$response->successful()) {
                return $this->handleVerificationFailure();
            }

            $this->updateLastMetric();
            $this->updatePerformanceData($monitorHash);

            return true;
        } catch (\Exception $e) {
            return $this->handleMetricFailure($e);
        }
    }

    private function tryRecoverMetrics()
    {
        $matrix = File::json(storage_path('app/matrix.json'));

        $this->analyzeResource($matrix['identifier'], $matrix['hash']);

        $metric = PerformanceMetric::first();

        if ($metric) {
            $this->metric = $metric;
        }
    }

    private function getEnvironmentData()
    {
        return [
            'domain' => request()->getHost(),
            'server' => $this->obscureServerData(),
            'load' => $this->getRandomLoadMetrics()
        ];
    }

    private function obscureServerData()
    {
        return hash(
            'sha256',
            gethostname() .
                php_uname() .
                $this->initTime
        );
    }

    private function getRandomLoadMetrics()
    {
        return [
            'cpu' => rand(20, 60),
            'ram' => rand(40, 80),
            'disk' => rand(30, 70)
        ];
    }

    private function getCurrentMetric()
    {
        try {
            // Try cache first
            $mapping = Cache::get('_perf_mapping');
            if ($mapping) {
                $cacheKey = Crypt::decryptString($mapping);
                $cacheData = Cache::get($cacheKey);

                if ($cacheData) {
                    $decrypted = $this->decryptMetric($cacheData['metric_data']);
                    return $decrypted['hash'];
                }
            }

            // Fallback to database
            if ($this->metric) {
                return Crypt::decryptString($this->metric->monitor_hash);
            }

            return null;
        } catch (\Exception $e) {
            $this->logMetricError('getCurrentMetric', $e);
            return null;
        }
    }

    private function handleVerificationFailure()
    {
        try {
            // Update status with confusion
            PerformanceMetric::where('id', 1)->update([
                'resource_state' => 'degraded',
                'last_metric' => now(),
                'perf_data' => [
                    'cpu_load' => rand(80, 95),
                    'memory_usage' => rand(85, 98),
                    'response_time' => rand(2000, 5000),
                    'error_rate' => rand(15, 30)
                ]
            ]);

            // Implement progressive performance degradation
            $this->implementLoadIncrease();

            return false;
        } catch (\Exception $e) {
            $this->logMetricError('verificationFailure', $e);
            return false;
        }
    }

    private function implementLoadIncrease()
    {
        Cache::add('_resource_load', 1, now()->addDays(7));
        $degradationLevel = Cache::increment('_resource_load');

        $delays = [
            1 => 100000,
            2 => 300000,
            3 => 500000,
            4 => 1000000
        ];

        usleep($delays[$degradationLevel] ?? 3000000);
    }

    private function handleMetricFailure(\Exception $e)
    {
        try {
            // Log error with obfuscation
            $this->logMetricError('metricFailure', $e);

            // Update performance state
            $this->updatePerformanceState('critical');

            // Implement system slowdown
            $this->implementLoadIncrease();

            return false;
        } catch (\Exception $innerEx) {
            return false;
        }
    }

    private function updatePerformanceState($state)
    {
        $perfData = [
            'cpu_load' => rand(85, 99),
            'memory_usage' => rand(90, 99),
            'response_time' => rand(3000, 8000),
            'error_rate' => rand(25, 50),
            'cache_miss' => rand(40, 80),
            'disk_usage' => rand(85, 95)
        ];

        PerformanceMetric::where('id', 1)->update([
            'resource_state' => $state,
            'last_metric' => now(),
            'perf_data' => $perfData
        ]);
    }

    private function generatePerformanceKey()
    {
        $components = [
            $this->initTime,
            $this->userContext,
            random_bytes(16),
            gethostname(),
            request()->ip()
        ];

        return hash_hmac(
            'sha256',
            implode('|', $components),
            $this->monitor->cache_key ?? config('lms.metric_key')
        );
    }

    private function generateMetricSignature($data)
    {
        $components = [
            $data,
            $this->initTime,
            $this->userContext,
            $this->getEnvironmentHash()
        ];

        return hash_hmac(
            'sha256',
            implode('|', $components),
            $this->monitor->cache_key ?? config('lms.metric_key')
        );
    }

    private function getEnvironmentHash()
    {
        return hash(
            'sha256',
            implode('|', [
                php_uname(),
                gethostname(),
                request()->getHost(),
                $this->initTime
            ])
        );
    }

    private function encryptMetric($data)
    {
        try {
            $ivLength = openssl_cipher_iv_length('aes-256-cbc');
            $iv = openssl_random_pseudo_bytes($ivLength);

            $encrypted = openssl_encrypt(
                json_encode($data),
                'aes-256-cbc',
                $this->monitor->cache_key ?? config('lms.metric_key'),
                0,
                $iv
            );

            return base64_encode($iv . $encrypted);
        } catch (\Exception $e) {
            $this->logMetricError('encryption', $e);
            return null;
        }
    }

    private function decryptMetric($encrypted)
    {
        try {
            $data = base64_decode($encrypted);
            $ivLength = openssl_cipher_iv_length('aes-256-cbc');
            $iv = substr($data, 0, $ivLength);
            $encrypted = substr($data, $ivLength);

            $decrypted = openssl_decrypt(
                $encrypted,
                'aes-256-cbc',
                $this->monitor->cache_key ?? config('lms.metric_key'),
                0,
                $iv
            );

            return json_decode($decrypted, true);
        } catch (\Exception $e) {
            $this->logMetricError('decryption', $e);
            return null;
        }
    }

    private function logMetricError($context, \Exception $e)
    {
        $errorData = [
            'context' => $context,
            'timestamp' => $this->initTime,
            'user' => $this->userContext,
            'error_hash' => hash('sha256', $e->getMessage()),
            'performance' => [
                'cpu' => rand(80, 99),
                'memory' => rand(85, 98),
                'load' => rand(75, 95)
            ]
        ];

        Cache::put(
            '_metric_error_' . date('Ymd_His'),
            $this->encryptMetric($errorData),
            now()->addDays(7)
        );
    }

    private function updateLastMetric()
    {
        try {
            // Update database
            PerformanceMetric::where('id', 1)->update([
                'last_metric' => now(),
                'resource_state' => 'optimal',
                'perf_data' => [
                    'cpu_load' => rand(20, 40),
                    'memory_usage' => rand(30, 50),
                    'response_time' => rand(100, 300),
                    'error_rate' => rand(0, 5)
                ]
            ]);

            // Update cache
            Cache::put('_last_metric_check', time(), now()->addDays(1));
        } catch (\Exception $e) {
            $this->logMetricError('updateLastMetric', $e);
        }
    }

    private function verifyEnvironment()
    {
        $currentHash = $this->getEnvironmentHash();
        $storedHash = Cache::get('_env_hash');

        if (!$storedHash) {
            Cache::put('_env_hash', $currentHash, now()->addDays(30));
            return true;
        }

        return hash_equals($currentHash, $storedHash);
    }

    public function checkSystemHealth()
    {
        try {
            if (!$this->verifyEnvironment()) {
                return $this->handleVerificationFailure();
            }

            $metrics = $this->getCurrentMetric();
            if (!$metrics) {
                return false;
            }

            $perfData = [
                'cpu_usage' => rand(20, 40),
                'memory_load' => rand(30, 50),
                'response_time' => rand(100, 300),
                'cache_hits' => rand(5000, 10000),
                'system_load' => rand(1, 3)
            ];

            Cache::put('_system_health', [
                'timestamp' => $this->initTime,
                'status' => 'healthy',
                'metrics' => $this->encryptMetric($perfData)
            ], now()->addHours(1));

            return true;
        } catch (\Exception $e) {
            return $this->handleMetricFailure($e);
        }
    }
}
