<?php
declare(strict_types=1);

namespace App\Controller;

use Fendx\Core\Annotation\Controller;
use Fendx\Web\Annotation\GetRoute;
use Fendx\Web\Request\Request;
use Fendx\Web\Response\Response;
use Fendx\Monitor\Service\MonitorService;

#[Controller('/monitor')]
class MonitorController
{
    #[GetRoute('/health')]
    public function health(): array
    {
        $health = MonitorService::getHealthStatus();
        
        $httpCode = match ($health['status']) {
            'healthy' => 200,
            'warning' => 200,
            'critical' => 503,
            default => 200
        };
        
        return Response::success($health, 'Health check completed', $httpCode);
    }

    #[GetRoute('/health/{component}')]
    public function healthComponent(string $component): array
    {
        try {
            $health = MonitorService::checkIndividualHealth($component);
            
            $httpCode = match ($health['status']) {
                'healthy' => 200,
                'warning' => 200,
                'critical' => 503,
                default => 200
            };
            
            return Response::success($health, "Health check for {$component} completed", $httpCode);
        } catch (\InvalidArgumentException $e) {
            return Response::error(404, "Health check '{$component}' not found");
        }
    }

    #[GetRoute('/health/checks')]
    public function healthChecks(): array
    {
        $checks = MonitorService::getAvailableHealthChecks();
        return Response::success($checks);
    }

    #[GetRoute('/metrics')]
    public function metrics(Request $request): array
    {
        $format = $request->get('format', 'json');
        
        if ($format === 'prometheus') {
            header('Content-Type: text/plain; version=0.0.4');
            echo MonitorService::exportMetrics('prometheus');
            exit;
        }
        
        $metrics = MonitorService::getMetricsSummary();
        return Response::success($metrics);
    }

    #[GetRoute('/alerts')]
    public function alerts(): array
    {
        $alerts = MonitorService::getAlerts();
        return Response::success($alerts);
    }

    #[GetRoute('/alerts/active')]
    public function activeAlerts(): array
    {
        $alerts = MonitorService::getActiveAlerts();
        return Response::success($alerts);
    }

    #[PostRoute('/alerts/{alertId}/acknowledge')]
    public function acknowledgeAlert(string $alertId, Request $request): array
    {
        $data = $request->all();
        $acknowledgedBy = $data['acknowledged_by'] ?? 'system';
        
        $success = MonitorService::acknowledgeAlert($alertId, $acknowledgedBy);
        
        if ($success) {
            return Response::success(null, 'Alert acknowledged');
        } else {
            return Response::error(404, 'Alert not found or already acknowledged');
        }
    }

    #[PostRoute('/alerts/{alertId}/resolve')]
    public function resolveAlert(string $alertId): array
    {
        $success = MonitorService::resolveAlert($alertId);
        
        if ($success) {
            return Response::success(null, 'Alert resolved');
        } else {
            return Response::error(404, 'Alert not found');
        }
    }

    #[GetRoute('/errors')]
    public function errors(Request $request): array
    {
        $filters = [];
        
        if ($type = $request->get('type')) {
            $filters['type'] = $type;
        }
        
        if ($severity = $request->get('severity')) {
            $filters['severity'] = $severity;
        }
        
        $errors = MonitorService::getErrors($filters);
        return Response::success($errors);
    }

    #[GetRoute('/errors/statistics')]
    public function errorStatistics(): array
    {
        $stats = MonitorService::getErrorStatistics();
        return Response::success($stats);
    }

    #[GetRoute('/errors/trends')]
    public function errorTrends(Request $request): array
    {
        $hours = (int)($request->get('hours', 24));
        $trends = MonitorService::getErrorTrends($hours);
        return Response::success($trends);
    }

    #[GetRoute('/logs/search')]
    public function searchLogs(Request $request): array
    {
        $criteria = [
            'level' => $request->get('level'),
            'message' => $request->get('message'),
            'trace_id' => $request->get('trace_id'),
            'start_time' => $request->get('start_time'),
            'end_time' => $request->get('end_time'),
            'pattern' => $request->get('pattern'),
            'limit' => (int)($request->get('limit', 100)),
            'offset' => (int)($request->get('offset', 0)),
            'sort' => $request->get('sort', 'desc'),
            'sort_by' => $request->get('sort_by', 'timestamp')
        ];
        
        $results = MonitorService::searchLogs($criteria);
        return Response::success($results);
    }

    #[GetRoute('/logs/aggregate')]
    public function aggregateLogs(Request $request): array
    {
        $criteria = [
            'time_range' => $request->get('time_range', '1h'),
            'group_by' => $request->get('group_by', 'level')
        ];
        
        $results = MonitorService::aggregateLogs($criteria);
        return Response::success($results);
    }

    #[GetRoute('/logs/files')]
    public function getLogFiles(): array
    {
        $files = MonitorService::getLogFiles();
        return Response::success($files);
    }

    #[GetRoute('/logs/content')]
    public function getLogContent(Request $request): array
    {
        $file = $request->get('file');
        $lines = (int)($request->get('lines', 100));
        $offset = (int)($request->get('offset', 0));
        
        if (!$file) {
            return Response::error(400, 'File parameter is required');
        }
        
        $content = MonitorService::getLogContent($file, $lines, $offset);
        return Response::success($content);
    }

    #[GetRoute('/logs/realtime')]
    public function getRealTimeLogs(Request $request): array
    {
        $tail = (int)($request->get('tail', 100));
        $logs = MonitorService::getRealTimeLogs($tail);
        return Response::success($logs);
    }

    #[GetRoute('/logs/export')]
    public function exportLogs(Request $request): void
    {
        $criteria = [
            'level' => $request->get('level'),
            'message' => $request->get('message'),
            'start_time' => $request->get('start_time'),
            'end_time' => $request->get('end_time'),
            'limit' => (int)($request->get('limit', 1000))
        ];
        
        $format = $request->get('format', 'json');
        $content = MonitorService::exportLogs($criteria, $format);
        
        $filename = 'logs_' . date('Y-m-d_H-i-s') . '.' . $format;
        
        header('Content-Type: ' . match ($format) {
            'json' => 'application/json',
            'csv' => 'text/csv',
            'txt' => 'text/plain',
            default => 'application/octet-stream'
        });
        header('Content-Disposition: attachment; filename="' . $filename . '"');
        echo $content;
        exit;
    }

    #[GetRoute('/logs/charts/{chartType}')]
    public function generateLogChart(string $chartType, Request $request): void
    {
        $data = [];
        $title = $request->get('title', '');
        
        switch ($chartType) {
            case 'timeline':
            case 'error_trend':
                $timeRange = $request->get('time_range', '1h');
                $aggregation = MonitorService::aggregateLogs(['time_range' => $timeRange]);
                $data = $aggregation['timeline'] ?? [];
                break;
                
            case 'level_distribution':
                $aggregation = MonitorService::aggregateLogs();
                $data = $aggregation['groups'] ?? [];
                break;
                
            case 'top_errors':
                $aggregation = MonitorService::aggregateLogs();
                $data = $aggregation['top_errors'] ?? [];
                break;
                
            case 'bar':
                $aggregation = MonitorService::aggregateLogs();
                $data = $aggregation['groups'] ?? [];
                $title = $title ?: 'Log Distribution';
                break;
                
            default:
                $data = [];
        }
        
        $chart = MonitorService::generateLogChart($chartType, $data, $title);
        
        header('Content-Type: image/svg+xml');
        header('Cache-Control: no-cache');
        echo $chart;
        exit;
    }

    #[GetRoute('/stats')]
    public function stats(): array
    {
        $metrics = MonitorService::getMetricsSummary();
        
        $stats = [
            'system' => $metrics['system'] ?? [],
            'http_requests' => $this->extractHttpStats($metrics),
            'database' => $this->extractDatabaseStats($metrics),
            'cache' => $this->extractCacheStats($metrics),
            'errors' => $this->extractErrorStats($metrics),
            'performance' => $this->extractPerformanceStats($metrics)
        ];
        
        return Response::success($stats);
    }

    #[GetRoute('/dashboard')]
    public function dashboard(): array
    {
        $health = MonitorService::getHealthStatus();
        $metrics = MonitorService::getMetricsSummary();
        $alerts = MonitorService::getAlerts();
        
        $dashboard = [
            'overview' => [
                'status' => $health['status'],
                'uptime' => $metrics['system']['uptime'] ?? 0,
                'memory_usage' => $metrics['system']['memory_usage'] ?? 0,
                'cpu_usage' => $metrics['system']['cpu_usage'] ?? 0,
                'active_alerts' => count($alerts)
            ],
            'health_checks' => $health['checks'],
            'metrics' => [
                'requests_total' => $this->getTotalRequests($metrics),
                'errors_total' => $this->getTotalErrors($metrics),
                'avg_response_time' => $this->getAverageResponseTime($metrics),
                'success_rate' => $this->getSuccessRate($metrics)
            ],
            'recent_alerts' => array_slice($alerts, 0, 10)
        ];
        
        return Response::success($dashboard);
    }

    #[GetRoute('/clear')]
    public function clear(): array
    {
        MonitorService::clearMetrics();
        return Response::success(null, 'Metrics cleared');
    }

    private function extractHttpStats(array $metrics): array
    {
        $httpStats = [];
        
        if (isset($metrics['histograms']['http_request_duration'])) {
            $httpStats['duration'] = $metrics['histograms']['http_request_duration'];
        }
        
        if (isset($metrics['counters'])) {
            $httpStats['requests_by_status'] = [];
            foreach ($metrics['counters'] as $key => $value) {
                if (str_contains($key, 'http_requests_total')) {
                    $httpStats['requests_by_status'][$key] = $value;
                }
            }
        }
        
        return $httpStats;
    }

    private function extractDatabaseStats(array $metrics): array
    {
        $dbStats = [];
        
        if (isset($metrics['histograms']['db_query_duration'])) {
            $dbStats['query_duration'] = $metrics['histograms']['db_query_duration'];
        }
        
        if (isset($metrics['counters'])) {
            $dbStats['queries_by_type'] = [];
            foreach ($metrics['counters'] as $key => $value) {
                if (str_contains($key, 'db_queries_total')) {
                    $dbStats['queries_by_type'][$key] = $value;
                }
            }
        }
        
        return $dbStats;
    }

    private function extractCacheStats(array $metrics): array
    {
        $cacheStats = [];
        
        if (isset($metrics['counters'])) {
            $cacheStats['operations'] = [];
            $totalHits = 0;
            $totalMisses = 0;
            
            foreach ($metrics['counters'] as $key => $value) {
                if (str_contains($key, 'cache_operations_total')) {
                    $cacheStats['operations'][$key] = $value;
                    
                    if (str_contains($key, 'hit:true')) {
                        $totalHits += $value;
                    } elseif (str_contains($key, 'hit:false')) {
                        $totalMisses += $value;
                    }
                }
            }
            
            $total = $totalHits + $totalMisses;
            $cacheStats['hit_rate'] = $total > 0 ? round(($totalHits / $total) * 100, 2) . '%' : '0%';
        }
        
        return $cacheStats;
    }

    private function extractErrorStats(array $metrics): array
    {
        $errorStats = [];
        
        if (isset($metrics['counters'])) {
            $errorStats['errors_by_type'] = [];
            foreach ($metrics['counters'] as $key => $value) {
                if (str_contains($key, 'errors_total')) {
                    $errorStats['errors_by_type'][$key] = $value;
                }
            }
        }
        
        if (isset($metrics['metrics']['error'])) {
            $errorStats['recent_errors'] = array_slice($metrics['metrics']['error'], -10);
        }
        
        return $errorStats;
    }

    private function extractPerformanceStats(array $metrics): array
    {
        $perfStats = [
            'memory' => $metrics['system'] ?? [],
            'response_times' => [],
            'throughput' => []
        ];
        
        if (isset($metrics['histograms']['http_request_duration'])) {
            $perfStats['response_times'] = $metrics['histograms']['http_request_duration'];
        }
        
        // 计算吞吐量（每秒请求数）
        if (isset($metrics['metrics']['http_requests_total'])) {
            $requests = $metrics['metrics']['http_requests_total'];
            $now = microtime(true);
            $requestsInLastMinute = 0;
            
            foreach ($requests as $request) {
                if ($now - $request['timestamp'] < 60) {
                    $requestsInLastMinute++;
                }
            }
            
            $perfStats['throughput']['requests_per_minute'] = $requestsInLastMinute;
            $perfStats['throughput']['requests_per_second'] = round($requestsInLastMinute / 60, 2);
        }
        
        return $perfStats;
    }

    private function getTotalRequests(array $metrics): int
    {
        $total = 0;
        
        if (isset($metrics['counters'])) {
            foreach ($metrics['counters'] as $key => $value) {
                if (str_contains($key, 'http_requests_total')) {
                    $total += (int)$value;
                }
            }
        }
        
        return $total;
    }

    private function getTotalErrors(array $metrics): int
    {
        $total = 0;
        
        if (isset($metrics['counters'])) {
            foreach ($metrics['counters'] as $key => $value) {
                if (str_contains($key, 'errors_total')) {
                    $total += (int)$value;
                }
            }
        }
        
        return $total;
    }

    private function getAverageResponseTime(array $metrics): float
    {
        if (isset($metrics['histograms']['http_request_duration']['mean'])) {
            return round($metrics['histograms']['http_request_duration']['mean'], 3);
        }
        
        return 0.0;
    }

    private function getSuccessRate(array $metrics): string
    {
        $totalRequests = $this->getTotalRequests($metrics);
        $totalErrors = $this->getTotalErrors($metrics);
        
        if ($totalRequests === 0) {
            return '100%';
        }
        
        $successRate = (($totalRequests - $totalErrors) / $totalRequests) * 100;
        return round($successRate, 2) . '%';
    }
}