<?php

namespace App\Module\Admin\Services;

use App\Module\Admin\Enums\ADMIN_ACTION_TYPE;
use App\Module\Admin\Events\AdminActionEvent;
use App\Module\Admin\Utils\SystemInfo;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Event;
use Illuminate\Support\Facades\Log;

/**
 * Admin模块核心服务
 */
class AdminService
{
    /**
     * 获取仪表板数据
     *
     * @return array
     */
    public function getDashboardData(): array
    {
        return Cache::remember('admin.dashboard.data', 300, function () {
            $systemInfo = new SystemInfo();
            
            return [
                'system' => [
                    'server_info' => $systemInfo->getServerInfo(),
                    'php_info' => $systemInfo->getPhpInfo(),
                    'database_info' => $systemInfo->getDatabaseInfo(),
                    'performance' => $systemInfo->getPerformanceMetrics(),
                ],
                'statistics' => [
                    'users_online' => $this->getOnlineUsersCount(),
                    'total_requests' => $this->getTotalRequestsCount(),
                    'error_rate' => $this->getErrorRate(),
                    'response_time' => $this->getAverageResponseTime(),
                ],
                'alerts' => $this->getSystemAlerts(),
                'recent_actions' => $this->getRecentActions(),
            ];
        });
    }

    /**
     * 记录管理员操作
     *
     * @param ADMIN_ACTION_TYPE $actionType
     * @param string $description
     * @param array $data
     * @return void
     */
    public function logAdminAction(ADMIN_ACTION_TYPE $actionType, string $description, array $data = []): void
    {
        $adminUser = Auth::guard('admin')->user();
        
        $logData = [
            'admin_id' => $adminUser?->id,
            'admin_name' => $adminUser?->name ?? 'System',
            'action_type' => $actionType->value,
            'description' => $description,
            'data' => $data,
            'ip_address' => request()->ip(),
            'user_agent' => request()->userAgent(),
            'timestamp' => now(),
        ];

        // 触发事件
        Event::dispatch(new AdminActionEvent($logData));

        // 记录日志
        if ($actionType->needsDetailedLog()) {
            Log::channel('admin')->info("Admin Action: {$description}", $logData);
        }

        // 危险操作额外记录
        if ($actionType->isDangerous()) {
            Log::channel('admin')->warning("Dangerous Admin Action: {$description}", $logData);
        }
    }

    /**
     * 获取在线用户数量
     *
     * @return int
     */
    protected function getOnlineUsersCount(): int
    {
        // 这里可以根据实际需求实现
        // 例如：统计最近5分钟内有活动的用户
        return Cache::remember('admin.stats.online_users', 60, function () {
            // 实现逻辑
            return 0;
        });
    }

    /**
     * 获取总请求数
     *
     * @return int
     */
    protected function getTotalRequestsCount(): int
    {
        return Cache::remember('admin.stats.total_requests', 300, function () {
            // 实现逻辑
            return 0;
        });
    }

    /**
     * 获取错误率
     *
     * @return float
     */
    protected function getErrorRate(): float
    {
        return Cache::remember('admin.stats.error_rate', 300, function () {
            // 实现逻辑
            return 0.0;
        });
    }

    /**
     * 获取平均响应时间
     *
     * @return float
     */
    protected function getAverageResponseTime(): float
    {
        return Cache::remember('admin.stats.response_time', 300, function () {
            // 实现逻辑
            return 0.0;
        });
    }

    /**
     * 获取系统警报
     *
     * @return array
     */
    protected function getSystemAlerts(): array
    {
        $alerts = [];
        $systemInfo = new SystemInfo();
        $config = config('admin_module.monitoring.alerts');

        // CPU使用率警报
        $cpuUsage = $systemInfo->getCpuUsage();
        if ($cpuUsage > $config['cpu_threshold']) {
            $alerts[] = [
                'type' => 'warning',
                'title' => 'CPU使用率过高',
                'message' => "当前CPU使用率: {$cpuUsage}%",
                'timestamp' => now(),
            ];
        }

        // 内存使用率警报
        $memoryUsage = $systemInfo->getMemoryUsage();
        if ($memoryUsage['percentage'] > $config['memory_threshold']) {
            $alerts[] = [
                'type' => 'warning',
                'title' => '内存使用率过高',
                'message' => "当前内存使用率: {$memoryUsage['percentage']}%",
                'timestamp' => now(),
            ];
        }

        // 磁盘使用率警报
        $diskUsage = $systemInfo->getDiskUsage();
        if ($diskUsage['percentage'] > $config['disk_threshold']) {
            $alerts[] = [
                'type' => 'danger',
                'title' => '磁盘空间不足',
                'message' => "当前磁盘使用率: {$diskUsage['percentage']}%",
                'timestamp' => now(),
            ];
        }

        return $alerts;
    }

    /**
     * 获取最近的操作记录
     *
     * @param int $limit
     * @return array
     */
    protected function getRecentActions(int $limit = 10): array
    {
        return Cache::remember("admin.recent_actions.{$limit}", 60, function () use ($limit) {
            // 这里应该从数据库获取最近的操作记录
            // 暂时返回空数组
            return [];
        });
    }

    /**
     * 获取系统状态
     *
     * @return array
     */
    public function getSystemStatus(): array
    {
        $systemInfo = new SystemInfo();
        
        return [
            'status' => 'running',
            'uptime' => $systemInfo->getUptime(),
            'load_average' => $systemInfo->getLoadAverage(),
            'memory_usage' => $systemInfo->getMemoryUsage(),
            'disk_usage' => $systemInfo->getDiskUsage(),
            'database_status' => $systemInfo->getDatabaseStatus(),
            'cache_status' => $this->getCacheStatus(),
            'queue_status' => $this->getQueueStatus(),
        ];
    }

    /**
     * 获取缓存状态
     *
     * @return array
     */
    protected function getCacheStatus(): array
    {
        try {
            Cache::put('admin.cache.test', 'test', 1);
            $test = Cache::get('admin.cache.test');
            Cache::forget('admin.cache.test');
            
            return [
                'status' => $test === 'test' ? 'healthy' : 'error',
                'driver' => config('cache.default'),
            ];
        } catch (\Exception $e) {
            return [
                'status' => 'error',
                'error' => $e->getMessage(),
            ];
        }
    }

    /**
     * 获取队列状态
     *
     * @return array
     */
    protected function getQueueStatus(): array
    {
        try {
            return [
                'status' => 'healthy',
                'driver' => config('queue.default'),
                'pending_jobs' => 0, // 这里可以实现获取待处理任务数量的逻辑
            ];
        } catch (\Exception $e) {
            return [
                'status' => 'error',
                'error' => $e->getMessage(),
            ];
        }
    }

    /**
     * 执行系统维护
     *
     * @param array $options
     * @return array
     */
    public function performMaintenance(array $options = []): array
    {
        $results = [];
        
        // 清理缓存
        if ($options['clear_cache'] ?? true) {
            $cacheService = app('admin.cache');
            $results['cache'] = $cacheService->clearAll();
        }
        
        // 清理日志
        if ($options['clean_logs'] ?? false) {
            $logService = app('admin.log');
            $results['logs'] = $logService->cleanOldLogs();
        }
        
        // 优化数据库
        if ($options['optimize_database'] ?? false) {
            $results['database'] = $this->optimizeDatabase();
        }
        
        // 记录维护操作
        $this->logAdminAction(
            ADMIN_ACTION_TYPE::MAINTENANCE,
            '执行系统维护',
            ['options' => $options, 'results' => $results]
        );
        
        return $results;
    }

    /**
     * 优化数据库
     *
     * @return array
     */
    protected function optimizeDatabase(): array
    {
        try {
            // 这里可以实现数据库优化逻辑
            return [
                'status' => 'success',
                'message' => '数据库优化完成',
            ];
        } catch (\Exception $e) {
            return [
                'status' => 'error',
                'message' => $e->getMessage(),
            ];
        }
    }
}